trio.c

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/*************************************************************************
 *
 * $Id$
 *
 * Copyright (C) 1998 Bjorn Reese and Daniel Stenberg.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE AUTHORS AND
 * CONTRIBUTORS ACCEPT NO RESPONSIBILITY IN ANY CONCEIVABLE MANNER.
 *
 *************************************************************************
 *
 * A note to trio contributors:
 *
 * Avoid heap allocation at all costs to ensure that the trio functions
 * are async-safe. The exceptions are the printf/fprintf functions, which
 * uses fputc, and the asprintf functions and the <alloc> modifier, which
 * by design are required to allocate form the heap.
 *
 ************************************************************************/

/*
 * TODO:
 *  - Scan is probably too permissive about its modifiers.
 *  - C escapes in %#[] ?
 *  - Multibyte characters (done for format parsing, except scan groups)
 *  - Complex numbers? (C99 _Complex)
 *  - Boolean values? (C99 _Bool)
 *  - C99 NaN(n-char-sequence) missing. The n-char-sequence can be used
 *    to print the mantissa, e.g. NaN(0xc000000000000000)
 *  - Should we support the GNU %a alloc modifier? GNU has an ugly hack
 *    for %a, because C99 used %a for other purposes. If specified as
 *    %as or %a[ it is interpreted as the alloc modifier, otherwise as
 *    the C99 hex-float. This means that you cannot scan %as as a hex-float
 *    immediately followed by an 's'.
 *  - Scanning of collating symbols.
 */

/*************************************************************************
 * Trio include files
 */
#include "triodef.h"
#include "trio.h"
#include "triop.h"
#include "trionan.h"
#if !defined(TRIO_MINIMAL)
# include "triostr.h"
#endif

/**************************************************************************
 *
 * Definitions
 *
 *************************************************************************/

#include <math.h>
#include <limits.h>
#include <float.h>

#if (defined(__STDC_ISO_10646__) || defined(MB_LEN_MAX) \
     || defined(USE_MULTIBYTE) || TRIO_WIDECHAR) \
    && !defined(_WIN32_WCE)
# define TRIO_COMPILER_SUPPORTS_MULTIBYTE
# if !defined(MB_LEN_MAX)
#  define MB_LEN_MAX 6
# endif
#endif

#if (defined(TRIO_COMPILER_MSVC) && (_MSC_VER >= 1100)) || defined(TRIO_COMPILER_BCB)
# define TRIO_COMPILER_SUPPORTS_MSVC_INT
#endif

#if defined(_WIN32_WCE)
#include <wincecompat.h>
#endif

/*************************************************************************
 * Generic definitions
 */

#if !(defined(DEBUG) || defined(NDEBUG))
# define NDEBUG
#endif

#include <assert.h>
#include <ctype.h>
#if !defined(TRIO_COMPILER_SUPPORTS_C99)
# define isblank(x) (((x)==32) || ((x)==9))
#endif
#if defined(TRIO_COMPILER_ANCIENT)
# include <varargs.h>
#else
# include <stdarg.h>
#endif
#include <stddef.h>

#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif

#ifndef NULL
# define NULL 0
#endif
#define NIL ((char)0)
#ifndef FALSE
# define FALSE (1 == 0)
# define TRUE (! FALSE)
#endif
#define BOOLEAN_T int

/* mincore() can be used for debugging purposes */
#define VALID(x) (NULL != (x))

#if TRIO_ERRORS
  /*
   * Encode the error code and the position. This is decoded
   * with TRIO_ERROR_CODE and TRIO_ERROR_POSITION.
   */
# define TRIO_ERROR_RETURN(x,y) (- ((x) + ((y) << 8)))
#else
# define TRIO_ERROR_RETURN(x,y) (-1)
#endif

typedef unsigned long trio_flags_t;


/*************************************************************************
 * Platform specific definitions
 */
#if defined(TRIO_PLATFORM_UNIX)
# include <unistd.h>
# include <signal.h>
# include <locale.h>
# define USE_LOCALE
#endif /* TRIO_PLATFORM_UNIX */
#if defined(TRIO_PLATFORM_VMS)
# include <unistd.h>
#endif
#if defined(TRIO_PLATFORM_WIN32)
# if defined(_WIN32_WCE)
#  include <wincecompat.h>
# else
#  include <io.h>
#  define read _read
#  define write _write
# endif
#endif /* TRIO_PLATFORM_WIN32 */

#if TRIO_WIDECHAR
# if defined(TRIO_COMPILER_SUPPORTS_ISO94)
#  include <wchar.h>
#  include <wctype.h>
typedef wchar_t trio_wchar_t;
typedef wint_t trio_wint_t;
# else
typedef char trio_wchar_t;
typedef int trio_wint_t;
#  define WCONST(x) L ## x
#  define WEOF EOF
#  define iswalnum(x) isalnum(x)
#  define iswalpha(x) isalpha(x)
#  define iswblank(x) isblank(x)
#  define iswcntrl(x) iscntrl(x)
#  define iswdigit(x) isdigit(x)
#  define iswgraph(x) isgraph(x)
#  define iswlower(x) islower(x)
#  define iswprint(x) isprint(x)
#  define iswpunct(x) ispunct(x)
#  define iswspace(x) isspace(x)
#  define iswupper(x) isupper(x)
#  define iswxdigit(x) isxdigit(x)
# endif
#endif


/*************************************************************************
 * Compiler dependent definitions
 */

/* Support for long long */
#ifndef __cplusplus
# if !defined(USE_LONGLONG)
#  if defined(TRIO_COMPILER_GCC) && !defined(__STRICT_ANSI__)
#   define USE_LONGLONG
#  elif defined(TRIO_COMPILER_SUNPRO)
#   define USE_LONGLONG
#  elif defined(_LONG_LONG) || defined(_LONGLONG)
#   define USE_LONGLONG
#  endif
# endif
#endif

/* The extra long numbers */
#if defined(USE_LONGLONG)
typedef signed long long int trio_longlong_t;
typedef unsigned long long int trio_ulonglong_t;
#elif defined(TRIO_COMPILER_SUPPORTS_MSVC_INT)
typedef signed __int64 trio_longlong_t;
typedef unsigned __int64 trio_ulonglong_t;
#else
typedef TRIO_SIGNED long int trio_longlong_t;
typedef unsigned long int trio_ulonglong_t;
#endif

/* Maximal and fixed integer types */
#if defined(TRIO_COMPILER_SUPPORTS_C99)
# include <stdint.h>
typedef intmax_t trio_intmax_t;
typedef uintmax_t trio_uintmax_t;
typedef int8_t trio_int8_t;
typedef int16_t trio_int16_t;
typedef int32_t trio_int32_t;
typedef int64_t trio_int64_t;
#elif defined(TRIO_COMPILER_SUPPORTS_UNIX98)
# include <inttypes.h>
typedef intmax_t trio_intmax_t;
typedef uintmax_t trio_uintmax_t;
typedef int8_t trio_int8_t;
typedef int16_t trio_int16_t;
typedef int32_t trio_int32_t;
typedef int64_t trio_int64_t;
#elif defined(TRIO_COMPILER_SUPPORTS_MSVC_INT)
typedef trio_longlong_t trio_intmax_t;
typedef trio_ulonglong_t trio_uintmax_t;
typedef __int8 trio_int8_t;
typedef __int16 trio_int16_t;
typedef __int32 trio_int32_t;
typedef __int64 trio_int64_t;
#else
typedef trio_longlong_t trio_intmax_t;
typedef trio_ulonglong_t trio_uintmax_t;
# if defined(TRIO_INT8_T)
typedef TRIO_INT8_T trio_int8_t;
# else
typedef TRIO_SIGNED char trio_int8_t;
# endif
# if defined(TRIO_INT16_T)
typedef TRIO_INT16_T trio_int16_t;
# else
typedef TRIO_SIGNED short trio_int16_t;
# endif
# if defined(TRIO_INT32_T)
typedef TRIO_INT32_T trio_int32_t;
# else
typedef TRIO_SIGNED int trio_int32_t;
# endif
# if defined(TRIO_INT64_T)
typedef TRIO_INT64_T trio_int64_t;
# else
typedef trio_longlong_t trio_int64_t;
# endif
#endif

#if (!(defined(TRIO_COMPILER_SUPPORTS_C99) \
 || defined(TRIO_COMPILER_SUPPORTS_UNIX01))) \
 && !defined(_WIN32_WCE)
# define floorl(x) floor((double)(x))
# define fmodl(x,y) fmod((double)(x),(double)(y))
# define powl(x,y) pow((double)(x),(double)(y))
#endif

#define TRIO_FABS(x) (((x) < 0.0) ? -(x) : (x))

/*************************************************************************
 * Internal Definitions
 */

#ifndef DECIMAL_DIG
# define DECIMAL_DIG DBL_DIG
#endif

/* Long double sizes */
#ifdef LDBL_DIG
# define MAX_MANTISSA_DIGITS LDBL_DIG
# define MAX_EXPONENT_DIGITS 4
# define MAX_DOUBLE_DIGITS LDBL_MAX_10_EXP
#else
# define MAX_MANTISSA_DIGITS DECIMAL_DIG
# define MAX_EXPONENT_DIGITS 3
# define MAX_DOUBLE_DIGITS DBL_MAX_10_EXP
#endif

#if defined(TRIO_COMPILER_ANCIENT) || !defined(LDBL_DIG)
# undef LDBL_DIG
# undef LDBL_MANT_DIG
# undef LDBL_EPSILON
# define LDBL_DIG DBL_DIG
# define LDBL_MANT_DIG DBL_MANT_DIG
# define LDBL_EPSILON DBL_EPSILON
#endif

/* The maximal number of digits is for base 2 */
#define MAX_CHARS_IN(x) (sizeof(x) * CHAR_BIT)
/* The width of a pointer. The number of bits in a hex digit is 4 */
#define POINTER_WIDTH ((sizeof("0x") - 1) + sizeof(trio_pointer_t) * CHAR_BIT / 4)

/* Infinite and Not-A-Number for floating-point */
#define INFINITE_LOWER "inf"
#define INFINITE_UPPER "INF"
#define LONG_INFINITE_LOWER "infinite"
#define LONG_INFINITE_UPPER "INFINITE"
#define NAN_LOWER "nan"
#define NAN_UPPER "NAN"

/* Various constants */
enum {
  TYPE_PRINT = 1,
  TYPE_SCAN  = 2,

  /* Flags. FLAGS_LAST must be less than ULONG_MAX */
  FLAGS_NEW                 = 0,
  FLAGS_STICKY              = 1,
  FLAGS_SPACE               = 2 * FLAGS_STICKY,
  FLAGS_SHOWSIGN            = 2 * FLAGS_SPACE,
  FLAGS_LEFTADJUST          = 2 * FLAGS_SHOWSIGN,
  FLAGS_ALTERNATIVE         = 2 * FLAGS_LEFTADJUST,
  FLAGS_SHORT               = 2 * FLAGS_ALTERNATIVE,
  FLAGS_SHORTSHORT          = 2 * FLAGS_SHORT,
  FLAGS_LONG                = 2 * FLAGS_SHORTSHORT,
  FLAGS_QUAD                = 2 * FLAGS_LONG,
  FLAGS_LONGDOUBLE          = 2 * FLAGS_QUAD,
  FLAGS_SIZE_T              = 2 * FLAGS_LONGDOUBLE,
  FLAGS_PTRDIFF_T           = 2 * FLAGS_SIZE_T,
  FLAGS_INTMAX_T            = 2 * FLAGS_PTRDIFF_T,
  FLAGS_NILPADDING          = 2 * FLAGS_INTMAX_T,
  FLAGS_UNSIGNED            = 2 * FLAGS_NILPADDING,
  FLAGS_UPPER               = 2 * FLAGS_UNSIGNED,
  FLAGS_WIDTH               = 2 * FLAGS_UPPER,
  FLAGS_WIDTH_PARAMETER     = 2 * FLAGS_WIDTH,
  FLAGS_PRECISION           = 2 * FLAGS_WIDTH_PARAMETER,
  FLAGS_PRECISION_PARAMETER = 2 * FLAGS_PRECISION,
  FLAGS_BASE                = 2 * FLAGS_PRECISION_PARAMETER,
  FLAGS_BASE_PARAMETER      = 2 * FLAGS_BASE,
  FLAGS_FLOAT_E             = 2 * FLAGS_BASE_PARAMETER,
  FLAGS_FLOAT_G             = 2 * FLAGS_FLOAT_E,
  FLAGS_QUOTE               = 2 * FLAGS_FLOAT_G,
  FLAGS_WIDECHAR            = 2 * FLAGS_QUOTE,
  FLAGS_ALLOC               = 2 * FLAGS_WIDECHAR,
  FLAGS_IGNORE              = 2 * FLAGS_ALLOC,
  FLAGS_IGNORE_PARAMETER    = 2 * FLAGS_IGNORE,
  FLAGS_VARSIZE_PARAMETER   = 2 * FLAGS_IGNORE_PARAMETER,
  FLAGS_FIXED_SIZE          = 2 * FLAGS_VARSIZE_PARAMETER,
  FLAGS_LAST                = FLAGS_FIXED_SIZE,
  /* Reused flags */
  FLAGS_EXCLUDE             = FLAGS_SHORT,
  FLAGS_USER_DEFINED        = FLAGS_IGNORE,
  FLAGS_ROUNDING            = FLAGS_INTMAX_T,
  /* Compounded flags */
  FLAGS_ALL_VARSIZES        = FLAGS_LONG | FLAGS_QUAD | FLAGS_INTMAX_T | FLAGS_PTRDIFF_T | FLAGS_SIZE_T,
  FLAGS_ALL_SIZES           = FLAGS_ALL_VARSIZES | FLAGS_SHORTSHORT | FLAGS_SHORT,

  NO_POSITION  = -1,
  NO_WIDTH     =  0,
  NO_PRECISION = -1,
  NO_SIZE      = -1,

  /* Do not change these */
  NO_BASE      = -1,
  MIN_BASE     =  2,
  MAX_BASE     = 36,
  BASE_BINARY  =  2,
  BASE_OCTAL   =  8,
  BASE_DECIMAL = 10,
  BASE_HEX     = 16,

  /* Maximal number of allowed parameters */
  MAX_PARAMETERS = 64,
  /* Maximal number of characters in class */
  MAX_CHARACTER_CLASS = UCHAR_MAX + 1,

  /* Maximal string lengths for user-defined specifiers */
  MAX_USER_NAME = 64,
  MAX_USER_DATA = 256,
  
  /* Maximal length of locale separator strings */
  MAX_LOCALE_SEPARATOR_LENGTH = MB_LEN_MAX,
  /* Maximal number of integers in grouping */
  MAX_LOCALE_GROUPS = 64,

  /* Initial size of asprintf buffer */
  DYNAMIC_START_SIZE = 32
};

#define NO_GROUPING ((int)CHAR_MAX)

/* Fundamental formatting parameter types */
#define FORMAT_UNKNOWN   0
#define FORMAT_INT       1
#define FORMAT_DOUBLE    2
#define FORMAT_CHAR      3
#define FORMAT_STRING    4
#define FORMAT_POINTER   5
#define FORMAT_COUNT     6
#define FORMAT_PARAMETER 7
#define FORMAT_GROUP     8
#if TRIO_GNU
# define FORMAT_ERRNO    9
#endif
#if TRIO_EXTENSION
# define FORMAT_USER_DEFINED 10
#endif

/* Character constants */
#define CHAR_IDENTIFIER '%'
#define CHAR_BACKSLASH '\\'
#define CHAR_QUOTE '\"'
#define CHAR_ADJUST ' '

/* Character class expressions */
#define CLASS_ALNUM "[:alnum:]"
#define CLASS_ALPHA "[:alpha:]"
#define CLASS_BLANK "[:blank:]"
#define CLASS_CNTRL "[:cntrl:]"
#define CLASS_DIGIT "[:digit:]"
#define CLASS_GRAPH "[:graph:]"
#define CLASS_LOWER "[:lower:]"
#define CLASS_PRINT "[:print:]"
#define CLASS_PUNCT "[:punct:]"
#define CLASS_SPACE "[:space:]"
#define CLASS_UPPER "[:upper:]"
#define CLASS_XDIGIT "[:xdigit:]"

/*
 * SPECIFIERS:
 *
 *
 * a  Hex-float
 * A  Hex-float
 * c  Character
 * C  Widechar character (wint_t)
 * d  Decimal
 * e  Float
 * E  Float
 * F  Float
 * F  Float
 * g  Float
 * G  Float
 * i  Integer
 * m  Error message
 * n  Count
 * o  Octal
 * p  Pointer
 * s  String
 * S  Widechar string (wchar_t *)
 * u  Unsigned
 * x  Hex
 * X  Hex
 * [] Group
 * <> User-defined
 *
 * Reserved:
 *
 * D  Binary Coded Decimal %D(length,precision) (OS/390)
 */
#define SPECIFIER_CHAR 'c'
#define SPECIFIER_STRING 's'
#define SPECIFIER_DECIMAL 'd'
#define SPECIFIER_INTEGER 'i'
#define SPECIFIER_UNSIGNED 'u'
#define SPECIFIER_OCTAL 'o'
#define SPECIFIER_HEX 'x'
#define SPECIFIER_HEX_UPPER 'X'
#define SPECIFIER_FLOAT_E 'e'
#define SPECIFIER_FLOAT_E_UPPER 'E'
#define SPECIFIER_FLOAT_F 'f'
#define SPECIFIER_FLOAT_F_UPPER 'F'
#define SPECIFIER_FLOAT_G 'g'
#define SPECIFIER_FLOAT_G_UPPER 'G'
#define SPECIFIER_POINTER 'p'
#define SPECIFIER_GROUP '['
#define SPECIFIER_UNGROUP ']'
#define SPECIFIER_COUNT 'n'
#if TRIO_UNIX98
# define SPECIFIER_CHAR_UPPER 'C'
# define SPECIFIER_STRING_UPPER 'S'
#endif
#if TRIO_C99
# define SPECIFIER_HEXFLOAT 'a'
# define SPECIFIER_HEXFLOAT_UPPER 'A'
#endif
#if TRIO_GNU
# define SPECIFIER_ERRNO 'm'
#endif
#if TRIO_EXTENSION
# define SPECIFIER_BINARY 'b'
# define SPECIFIER_BINARY_UPPER 'B'
# define SPECIFIER_USER_DEFINED_BEGIN '<'
# define SPECIFIER_USER_DEFINED_END '>'
# define SPECIFIER_USER_DEFINED_SEPARATOR ':'
#endif

/*
 * QUALIFIERS:
 *
 *
 * Numbers = d,i,o,u,x,X
 * Float = a,A,e,E,f,F,g,G
 * String = s
 * Char = c
 *
 *
 * 9$ Position
 *      Use the 9th parameter. 9 can be any number between 1 and
 *      the maximal argument
 *
 * 9 Width
 *      Set width to 9. 9 can be any number, but must not be postfixed
 *      by '$'
 *
 * h  Short
 *    Numbers:
 *      (unsigned) short int
 *
 * hh Short short
 *    Numbers:
 *      (unsigned) char
 *
 * l  Long
 *    Numbers:
 *      (unsigned) long int
 *    String:
 *      as the S specifier
 *    Char:
 *      as the C specifier
 *
 * ll Long Long
 *    Numbers:
 *      (unsigned) long long int
 *
 * L  Long Double
 *    Float
 *      long double
 *
 * #  Alternative
 *    Float:
 *      Decimal-point is always present
 *    String:
 *      non-printable characters are handled as \number
 *
 *    Spacing
 *
 * +  Sign
 *
 * -  Alignment
 *
 * .  Precision
 *
 * *  Parameter
 *    print: use parameter
 *    scan: no parameter (ignore)
 *
 * q  Quad
 *
 * Z  size_t
 *
 * w  Widechar
 *
 * '  Thousands/quote
 *    Numbers:
 *      Integer part grouped in thousands
 *    Binary numbers:
 *      Number grouped in nibbles (4 bits)
 *    String:
 *      Quoted string
 *
 * j  intmax_t
 * t  prtdiff_t
 * z  size_t
 *
 * !  Sticky
 * @  Parameter (for both print and scan)
 *
 * I  n-bit Integer
 *    Numbers:
 *      The following options exists
 *        I8  = 8-bit integer
 *        I16 = 16-bit integer
 *        I32 = 32-bit integer
 *        I64 = 64-bit integer
 */
#define QUALIFIER_POSITION '$'
#define QUALIFIER_SHORT 'h'
#define QUALIFIER_LONG 'l'
#define QUALIFIER_LONG_UPPER 'L'
#define QUALIFIER_ALTERNATIVE '#'
#define QUALIFIER_SPACE ' '
#define QUALIFIER_PLUS '+'
#define QUALIFIER_MINUS '-'
#define QUALIFIER_DOT '.'
#define QUALIFIER_STAR '*'
#define QUALIFIER_CIRCUMFLEX '^' /* For scanlists */
#if TRIO_C99
# define QUALIFIER_SIZE_T 'z'
# define QUALIFIER_PTRDIFF_T 't'
# define QUALIFIER_INTMAX_T 'j'
#endif
#if TRIO_BSD || TRIO_GNU
# define QUALIFIER_QUAD 'q'
#endif
#if TRIO_GNU
# define QUALIFIER_SIZE_T_UPPER 'Z'
#endif
#if TRIO_MISC
# define QUALIFIER_WIDECHAR 'w'
#endif
#if TRIO_MICROSOFT
# define QUALIFIER_FIXED_SIZE 'I'
#endif
#if TRIO_EXTENSION
# define QUALIFIER_QUOTE '\''
# define QUALIFIER_STICKY '!'
# define QUALIFIER_VARSIZE '&' /* This should remain undocumented */
# define QUALIFIER_PARAM '@' /* Experimental */
# define QUALIFIER_COLON ':' /* For scanlists */
# define QUALIFIER_EQUAL '=' /* For scanlists */
# define QUALIFIER_ROUNDING_UPPER 'R'
#endif


/*************************************************************************
 *
 * Internal Structures
 *
 *************************************************************************/

/* Parameters */
typedef struct {
  /* An indication of which entry in the data union is used */
  int type;
  /* The flags */
  trio_flags_t flags;
  /* The width qualifier */
  int width;
  /* The precision qualifier */
  int precision;
  /* The base qualifier */
  int base;
  /* The size for the variable size qualifier */
  int varsize;
  /* The marker of the end of the specifier */
  int indexAfterSpecifier;
  /* The data from the argument list */
  union {
    char *string;
#if TRIO_WIDECHAR
    trio_wchar_t *wstring;
#endif
    trio_pointer_t pointer;
    union {
      trio_intmax_t as_signed;
      trio_uintmax_t as_unsigned;
    } number;
    double doubleNumber;
    double *doublePointer;
    trio_long_double_t longdoubleNumber;
    trio_long_double_t *longdoublePointer;
    int errorNumber;
  } data;
  /* For the user-defined specifier */
  char user_name[MAX_USER_NAME];
  char user_data[MAX_USER_DATA];
} trio_parameter_t;

/* Container for customized functions */
typedef struct {
  union {
    trio_outstream_t out;
    trio_instream_t in;
  } stream;
  trio_pointer_t closure;
} trio_custom_t;

/* General trio "class" */
typedef struct _trio_class_t {
  /*
   * The function to write characters to a stream.
   */
  void (*OutStream) TRIO_PROTO((struct _trio_class_t *, int));
  /*
   * The function to read characters from a stream.
   */
  void (*InStream) TRIO_PROTO((struct _trio_class_t *, int *));
  /*
   * The current location in the stream.
   */
  trio_pointer_t location;
  /*
   * The character currently being processed.
   */
  int current;
  /*
   * The number of characters that would have been written/read
   * if there had been sufficient space.
   */
  int processed;
  /*
   * The number of characters that are actually written/read.
   * Processed and committed will only differ for the *nprintf
   * and *nscanf functions.
   */
  int committed;
  /*
   * The upper limit of characters that may be written/read.
   */
  int max;
  /*
   * The last output error that was detected.
   */
  int error;
} trio_class_t;

/* References (for user-defined callbacks) */
typedef struct _trio_reference_t {
  trio_class_t *data;
  trio_parameter_t *parameter;
} trio_reference_t;

/* Registered entries (for user-defined callbacks) */
typedef struct _trio_userdef_t {
  struct _trio_userdef_t *next;
  trio_callback_t callback;
  char *name;
} trio_userdef_t;

/*************************************************************************
 *
 * Internal Variables
 *
 *************************************************************************/

static TRIO_CONST char rcsid[] = "@(#)$Id$";

/*
 * Need this to workaround a parser bug in HP C/iX compiler that fails
 * to resolves macro definitions that includes type 'long double',
 * e.g: va_arg(arg_ptr, long double)
 */
#if defined(TRIO_PLATFORM_MPEIX)
static TRIO_CONST trio_long_double_t ___dummy_long_double = 0;
#endif

static TRIO_CONST char internalNullString[] = "(nil)";

#if defined(USE_LOCALE)
static struct lconv *internalLocaleValues = NULL;
#endif

/*
 * UNIX98 says "in a locale where the radix character is not defined,
 * the radix character defaults to a period (.)"
 */
static int internalDecimalPointLength = 1;
static int internalThousandSeparatorLength = 1;
static char internalDecimalPoint = '.';
static char internalDecimalPointString[MAX_LOCALE_SEPARATOR_LENGTH + 1] = ".";
static char internalThousandSeparator[MAX_LOCALE_SEPARATOR_LENGTH + 1] = ",";
static char internalGrouping[MAX_LOCALE_GROUPS] = { (char)NO_GROUPING };

static TRIO_CONST char internalDigitsLower[] = "0123456789abcdefghijklmnopqrstuvwxyz";
static TRIO_CONST char internalDigitsUpper[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
static BOOLEAN_T internalDigitsUnconverted = TRUE;
static int internalDigitArray[128];
#if TRIO_EXTENSION
static BOOLEAN_T internalCollationUnconverted = TRUE;
static char internalCollationArray[MAX_CHARACTER_CLASS][MAX_CHARACTER_CLASS];
#endif

#if TRIO_EXTENSION
static TRIO_VOLATILE trio_callback_t internalEnterCriticalRegion = NULL;
static TRIO_VOLATILE trio_callback_t internalLeaveCriticalRegion = NULL;
static trio_userdef_t *internalUserDef = NULL;
#endif


/*************************************************************************
 *
 * Internal Functions
 *
 ************************************************************************/

#if defined(TRIO_MINIMAL)
# define TRIO_STRING_PUBLIC static
# include "triostr.c"
#endif /* defined(TRIO_MINIMAL) */

/*************************************************************************
 * TrioIsQualifier
 *
 * Description:
 *  Remember to add all new qualifiers to this function.
 *  QUALIFIER_POSITION must not be added.
 */
TRIO_PRIVATE BOOLEAN_T
TrioIsQualifier
TRIO_ARGS1((character),
       TRIO_CONST char character)
{
  /* QUALIFIER_POSITION is not included */
  switch (character)
    {
    case '0': case '1': case '2': case '3': case '4':
    case '5': case '6': case '7': case '8': case '9':
    case QUALIFIER_PLUS:
    case QUALIFIER_MINUS:
    case QUALIFIER_SPACE:
    case QUALIFIER_DOT:
    case QUALIFIER_STAR:
    case QUALIFIER_ALTERNATIVE:
    case QUALIFIER_SHORT:
    case QUALIFIER_LONG:
    case QUALIFIER_LONG_UPPER:
    case QUALIFIER_CIRCUMFLEX:
#if defined(QUALIFIER_SIZE_T)
    case QUALIFIER_SIZE_T:
#endif
#if defined(QUALIFIER_PTRDIFF_T)
    case QUALIFIER_PTRDIFF_T:
#endif
#if defined(QUALIFIER_INTMAX_T)
    case QUALIFIER_INTMAX_T:
#endif
#if defined(QUALIFIER_QUAD)
    case QUALIFIER_QUAD:
#endif
#if defined(QUALIFIER_SIZE_T_UPPER)
    case QUALIFIER_SIZE_T_UPPER:
#endif
#if defined(QUALIFIER_WIDECHAR)
    case QUALIFIER_WIDECHAR:
#endif
#if defined(QUALIFIER_QUOTE)
    case QUALIFIER_QUOTE:
#endif
#if defined(QUALIFIER_STICKY)
    case QUALIFIER_STICKY:
#endif
#if defined(QUALIFIER_VARSIZE)
    case QUALIFIER_VARSIZE:
#endif
#if defined(QUALIFIER_PARAM)
    case QUALIFIER_PARAM:
#endif
#if defined(QUALIFIER_FIXED_SIZE)
    case QUALIFIER_FIXED_SIZE:
#endif
#if defined(QUALIFIER_ROUNDING_UPPER)
    case QUALIFIER_ROUNDING_UPPER:
#endif
      return TRUE;
    default:
      return FALSE;
    }
}

/*************************************************************************
 * TrioSetLocale
 */
#if defined(USE_LOCALE)
TRIO_PRIVATE void
TrioSetLocale(TRIO_NOARGS)
{
  internalLocaleValues = (struct lconv *)localeconv();
  if (internalLocaleValues)
    {
      if ((internalLocaleValues->decimal_point) &&
      (internalLocaleValues->decimal_point[0] != NIL))
    {
      internalDecimalPointLength = trio_length(internalLocaleValues->decimal_point);
      if (internalDecimalPointLength == 1)
        {
          internalDecimalPoint = internalLocaleValues->decimal_point[0];
        }
      else
        {
          internalDecimalPoint = NIL;
          trio_copy_max(internalDecimalPointString,
                sizeof(internalDecimalPointString),
                internalLocaleValues->decimal_point);
        }
    }
      if ((internalLocaleValues->thousands_sep) &&
      (internalLocaleValues->thousands_sep[0] != NIL))
    {
      trio_copy_max(internalThousandSeparator,
            sizeof(internalThousandSeparator),
            internalLocaleValues->thousands_sep);
      internalThousandSeparatorLength = trio_length(internalThousandSeparator);
    }
      if ((internalLocaleValues->grouping) &&
      (internalLocaleValues->grouping[0] != NIL))
    {
      trio_copy_max(internalGrouping,
            sizeof(internalGrouping),
            internalLocaleValues->grouping);
    }
    }
}
#endif /* defined(USE_LOCALE) */

TRIO_PRIVATE int
TrioCalcThousandSeparatorLength
TRIO_ARGS1((digits),
       int digits)
{
#if TRIO_EXTENSION
  int count = 0;
  int step = NO_GROUPING;
  char *groupingPointer = internalGrouping;

  while (digits > 0)
    {
      if (*groupingPointer == CHAR_MAX)
    {
      /* Disable grouping */
      break; /* while */
    }
      else if (*groupingPointer == 0)
    {
      /* Repeat last group */
      if (step == NO_GROUPING)
        {
          /* Error in locale */
          break; /* while */
        }
    }
      else
    {
      step = *groupingPointer++;
    }
      if (digits > step)
    count += internalThousandSeparatorLength;
      digits -= step;
    }
  return count;
#else
  return 0;
#endif
}

TRIO_PRIVATE BOOLEAN_T
TrioFollowedBySeparator
TRIO_ARGS1((position),
       int position)
{
#if TRIO_EXTENSION
  int step = 0;
  char *groupingPointer = internalGrouping;

  position--;
  if (position == 0)
    return FALSE;
  while (position > 0)
    {
      if (*groupingPointer == CHAR_MAX)
    {
      /* Disable grouping */
      break; /* while */
    }
      else if (*groupingPointer != 0)
    {
      step = *groupingPointer++;
    }
      if (step == 0)
    break;
      position -= step;
    }
  return (position == 0);
#else
  return FALSE;
#endif
}

/*************************************************************************
 * TrioGetPosition
 *
 * Get the %n$ position.
 */
TRIO_PRIVATE int
TrioGetPosition
TRIO_ARGS2((format, indexPointer),
       TRIO_CONST char *format,
       int *indexPointer)
{
#if TRIO_UNIX98
  char *tmpformat;
  int number = 0;
  int index = *indexPointer;

  number = (int)trio_to_long(&format[index], &tmpformat, BASE_DECIMAL);
  index = (int)(tmpformat - format);
  if ((number != 0) && (QUALIFIER_POSITION == format[index++]))
    {
      *indexPointer = index;
      /*
       * number is decreased by 1, because n$ starts from 1, whereas
       * the array it is indexing starts from 0.
       */
      return number - 1;
    }
#endif
  return NO_POSITION;
}

#if TRIO_EXTENSION
/*************************************************************************
 * TrioFindNamespace
 *
 * Find registered user-defined specifier.
 * The prev argument is used for optimization only.
 */
TRIO_PRIVATE trio_userdef_t *
TrioFindNamespace
TRIO_ARGS2((name, prev),
       TRIO_CONST char *name,
       trio_userdef_t **prev)
{
  trio_userdef_t *def;
  
  if (internalEnterCriticalRegion)
    (void)internalEnterCriticalRegion(NULL);
  
  for (def = internalUserDef; def; def = def->next)
    {
      /* Case-sensitive string comparison */
      if (trio_equal_case(def->name, name))
    break;
      
      if (prev)
    *prev = def;
    }
  
  if (internalLeaveCriticalRegion)
    (void)internalLeaveCriticalRegion(NULL);
  
  return def;
}
#endif

/*************************************************************************
 * TrioPower
 *
 * Description:
 *  Calculate pow(base, exponent), where number and exponent are integers.
 */
TRIO_PRIVATE trio_long_double_t
TrioPower
TRIO_ARGS2((number, exponent),
       int number,
       int exponent)
{
  trio_long_double_t result;

  if (number == 10)
    {
      switch (exponent)
    {
      /* Speed up calculation of common cases */
    case 0:
      result = (trio_long_double_t)number * TRIO_SUFFIX_LONG(1E-1);
      break;
    case 1:
      result = (trio_long_double_t)number * TRIO_SUFFIX_LONG(1E+0);
      break;
    case 2:
      result = (trio_long_double_t)number * TRIO_SUFFIX_LONG(1E+1);
      break;
    case 3:
      result = (trio_long_double_t)number * TRIO_SUFFIX_LONG(1E+2);
      break;
    case 4:
      result = (trio_long_double_t)number * TRIO_SUFFIX_LONG(1E+3);
      break;
    case 5:
      result = (trio_long_double_t)number * TRIO_SUFFIX_LONG(1E+4);
      break;
    case 6:
      result = (trio_long_double_t)number * TRIO_SUFFIX_LONG(1E+5);
      break;
    case 7:
      result = (trio_long_double_t)number * TRIO_SUFFIX_LONG(1E+6);
      break;
    case 8:
      result = (trio_long_double_t)number * TRIO_SUFFIX_LONG(1E+7);
      break;
    case 9:
      result = (trio_long_double_t)number * TRIO_SUFFIX_LONG(1E+8);
      break;
    default:
      result = powl((trio_long_double_t)number,
            (trio_long_double_t)exponent);
      break;
    }
    }
  else
    {
      return powl((trio_long_double_t)number, (trio_long_double_t)exponent);
    }
  return result;
}

/*************************************************************************
 * TrioLogarithm
 */
TRIO_PRIVATE double
TrioLogarithm
TRIO_ARGS2((number, base),
       double number,
       int base)
{
  double result;

  if (number <= 0.0)
    {
      /* xlC crashes on log(0) */
      result = (number == 0.0) ? trio_ninf() : trio_nan();
    }
  else
    {
      if (base == 10)
    {
      result = log10(number);
    }
      else
    {
      result = log10(number) / log10((double)base);
    }
    }
  return result;
}

/*************************************************************************
 * TrioLogarithmBase
 */
TRIO_PRIVATE double
TrioLogarithmBase
TRIO_ARGS1((base),
       int base)
{
  switch (base)
    {
    case BASE_BINARY : return 1.0;
    case BASE_OCTAL  : return 3.0;
    case BASE_DECIMAL: return 3.321928094887362345;
    case BASE_HEX    : return 4.0;
    default          : return TrioLogarithm((double)base, 2);
    }
}

/*************************************************************************
 * TrioParse
 *
 * Description:
 *  Parse the format string
 */
TRIO_PRIVATE int
TrioParse
TRIO_ARGS5((type, format, parameters, arglist, argarray),
       int type,
       TRIO_CONST char *format,
       trio_parameter_t *parameters,
       va_list *arglist,
       trio_pointer_t *argarray)
{
  /* Count the number of times a parameter is referenced */
  unsigned short usedEntries[MAX_PARAMETERS];
  /* Parameter counters */
  int parameterPosition;
  int currentParam;
  int maxParam = -1;
  /* Utility variables */
  trio_flags_t flags;
  int width;
  int precision;
  int varsize;
  int base;
  int index;  /* Index into formatting string */
  int dots;  /* Count number of dots in modifier part */
  BOOLEAN_T positional;  /* Does the specifier have a positional? */
  BOOLEAN_T gotSticky = FALSE;  /* Are there any sticky modifiers at all? */
  /*
   * indices specifies the order in which the parameters must be
   * read from the va_args (this is necessary to handle positionals)
   */
  int indices[MAX_PARAMETERS];
  int pos = 0;
  /* Various variables */
  char ch;
#if defined(TRIO_COMPILER_SUPPORTS_MULTIBYTE)
  int charlen;
#endif
  int save_errno;
  int i = -1;
  int num;
  char *tmpformat;

  /* One and only one of arglist and argarray must be used */
  assert((arglist != NULL) ^ (argarray != NULL));
  
  /*
   * The 'parameters' array is not initialized, but we need to
   * know which entries we have used.
   */
  memset(usedEntries, 0, sizeof(usedEntries));

  save_errno = errno;
  index = 0;
  parameterPosition = 0;
#if defined(TRIO_COMPILER_SUPPORTS_MULTIBYTE)
  (void)mblen(NULL, 0);
#endif
  
  while (format[index])
    {
#if defined(TRIO_COMPILER_SUPPORTS_MULTIBYTE)
      if (! isascii(format[index]))
    {
      /*
       * Multibyte characters cannot be legal specifiers or
       * modifiers, so we skip over them.
       */
      charlen = mblen(&format[index], MB_LEN_MAX);
      index += (charlen > 0) ? charlen : 1;
      continue; /* while */
    }
#endif /* TRIO_COMPILER_SUPPORTS_MULTIBYTE */
      if (CHAR_IDENTIFIER == format[index++])
    {
      if (CHAR_IDENTIFIER == format[index])
        {
          index++;
          continue; /* while */
        }

      flags = FLAGS_NEW;
      dots = 0;
      currentParam = TrioGetPosition(format, &index);
      positional = (NO_POSITION != currentParam);
      if (!positional)
        {
          /* We have no positional, get the next counter */
          currentParam = parameterPosition;
        }
          if(currentParam >= MAX_PARAMETERS)
        {
          /* Bail out completely to make the error more obvious */
          return TRIO_ERROR_RETURN(TRIO_ETOOMANY, index);
        }

      if (currentParam > maxParam)
        maxParam = currentParam;

      /* Default values */
      width = NO_WIDTH;
      precision = NO_PRECISION;
      base = NO_BASE;
      varsize = NO_SIZE;

      while (TrioIsQualifier(format[index]))
        {
          ch = format[index++];

          switch (ch)
        {
        case QUALIFIER_SPACE:
          flags |= FLAGS_SPACE;
          break;

        case QUALIFIER_PLUS:
          flags |= FLAGS_SHOWSIGN;
          break;

        case QUALIFIER_MINUS:
          flags |= FLAGS_LEFTADJUST;
          flags &= ~FLAGS_NILPADDING;
          break;

        case QUALIFIER_ALTERNATIVE:
          flags |= FLAGS_ALTERNATIVE;
          break;

        case QUALIFIER_DOT:
          if (dots == 0) /* Precision */
            {
              dots++;

              /* Skip if no precision */
              if (QUALIFIER_DOT == format[index])
            break;
              
              /* After the first dot we have the precision */
              flags |= FLAGS_PRECISION;
              if ((QUALIFIER_STAR == format[index])
#if defined(QUALIFIER_PARAM)
              || (QUALIFIER_PARAM == format[index])
#endif
              )
            {
              index++;
              flags |= FLAGS_PRECISION_PARAMETER;

              precision = TrioGetPosition(format, &index);
              if (precision == NO_POSITION)
                {
                  parameterPosition++;
                  if (positional)
                precision = parameterPosition;
                  else
                {
                  precision = currentParam;
                  currentParam = precision + 1;
                }
                }
              else
                {
                  if (! positional)
                currentParam = precision + 1;
                  if (width > maxParam)
                maxParam = precision;
                }
              if (currentParam > maxParam)
                maxParam = currentParam;
            }
              else
            {
              precision = trio_to_long(&format[index],
                           &tmpformat,
                           BASE_DECIMAL);
              index = (int)(tmpformat - format);
            }
            }
          else if (dots == 1) /* Base */
            {
              dots++;
              
              /* After the second dot we have the base */
              flags |= FLAGS_BASE;
              if ((QUALIFIER_STAR == format[index])
#if defined(QUALIFIER_PARAM)
              || (QUALIFIER_PARAM == format[index])
#endif
              )
            {
              index++;
              flags |= FLAGS_BASE_PARAMETER;
              base = TrioGetPosition(format, &index);
              if (base == NO_POSITION)
                {
                  parameterPosition++;
                  if (positional)
                base = parameterPosition;
                  else
                {
                  base = currentParam;
                  currentParam = base + 1;
                }
                }
              else
                {
                  if (! positional)
                currentParam = base + 1;
                  if (base > maxParam)
                maxParam = base;
                }
              if (currentParam > maxParam)
                maxParam = currentParam;
            }
              else
            {
              base = trio_to_long(&format[index],
                          &tmpformat,
                          BASE_DECIMAL);
              if (base > MAX_BASE)
                return TRIO_ERROR_RETURN(TRIO_EINVAL, index);
              index = (int)(tmpformat - format);
            }
            }
          else
            {
              return TRIO_ERROR_RETURN(TRIO_EINVAL, index);
            }
          break; /* QUALIFIER_DOT */

#if defined(QUALIFIER_PARAM)
        case QUALIFIER_PARAM:
          type = TYPE_PRINT;
          /* FALLTHROUGH */
#endif
        case QUALIFIER_STAR:
          /* This has different meanings for print and scan */
          if (TYPE_PRINT == type)
            {
              /* Read with from parameter */
              flags |= (FLAGS_WIDTH | FLAGS_WIDTH_PARAMETER);
              width = TrioGetPosition(format, &index);
              if (width == NO_POSITION)
            {
              parameterPosition++;
              if (positional)
                width = parameterPosition;
              else
                {
                  width = currentParam;
                  currentParam = width + 1;
                }
            }
              else
            {
              if (! positional)
                currentParam = width + 1;
              if (width > maxParam)
                maxParam = width;
            }
              if (currentParam > maxParam)
            maxParam = currentParam;
            }
          else
            {
              /* Scan, but do not store result */
              flags |= FLAGS_IGNORE;
            }

          break; /* QUALIFIER_STAR */

        case '0':
          if (! (flags & FLAGS_LEFTADJUST))
            flags |= FLAGS_NILPADDING;
          /* FALLTHROUGH */
        case '1': case '2': case '3': case '4':
        case '5': case '6': case '7': case '8': case '9':
          flags |= FLAGS_WIDTH;
          /* &format[index - 1] is used to "rewind" the read
           * character from format
           */
          width = trio_to_long(&format[index - 1],
                       &tmpformat,
                       BASE_DECIMAL);
          index = (int)(tmpformat - format);
          break;

        case QUALIFIER_SHORT:
          if (flags & FLAGS_SHORTSHORT)
            return TRIO_ERROR_RETURN(TRIO_EINVAL, index);
          else if (flags & FLAGS_SHORT)
            flags |= FLAGS_SHORTSHORT;
          else
            flags |= FLAGS_SHORT;
          break;

        case QUALIFIER_LONG:
          if (flags & FLAGS_QUAD)
            return TRIO_ERROR_RETURN(TRIO_EINVAL, index);
          else if (flags & FLAGS_LONG)
            flags |= FLAGS_QUAD;
          else
            flags |= FLAGS_LONG;
          break;

        case QUALIFIER_LONG_UPPER:
          flags |= FLAGS_LONGDOUBLE;
          break;

#if defined(QUALIFIER_SIZE_T)
        case QUALIFIER_SIZE_T:
          flags |= FLAGS_SIZE_T;
          /* Modify flags for later truncation of number */
          if (sizeof(size_t) == sizeof(trio_ulonglong_t))
            flags |= FLAGS_QUAD;
          else if (sizeof(size_t) == sizeof(long))
            flags |= FLAGS_LONG;
          break;
#endif

#if defined(QUALIFIER_PTRDIFF_T)
        case QUALIFIER_PTRDIFF_T:
          flags |= FLAGS_PTRDIFF_T;
          if (sizeof(ptrdiff_t) == sizeof(trio_ulonglong_t))
            flags |= FLAGS_QUAD;
          else if (sizeof(ptrdiff_t) == sizeof(long))
            flags |= FLAGS_LONG;
          break;
#endif

#if defined(QUALIFIER_INTMAX_T)
        case QUALIFIER_INTMAX_T:
          flags |= FLAGS_INTMAX_T;
          if (sizeof(trio_intmax_t) == sizeof(trio_ulonglong_t))
            flags |= FLAGS_QUAD;
          else if (sizeof(trio_intmax_t) == sizeof(long))
            flags |= FLAGS_LONG;
          break;
#endif

#if defined(QUALIFIER_QUAD)
        case QUALIFIER_QUAD:
          flags |= FLAGS_QUAD;
          break;
#endif

#if defined(QUALIFIER_FIXED_SIZE)
        case QUALIFIER_FIXED_SIZE:
          if (flags & FLAGS_FIXED_SIZE)
            return TRIO_ERROR_RETURN(TRIO_EINVAL, index);

          if (flags & (FLAGS_ALL_SIZES | FLAGS_LONGDOUBLE |
                   FLAGS_WIDECHAR | FLAGS_VARSIZE_PARAMETER))
            return TRIO_ERROR_RETURN(TRIO_EINVAL, index);

          if ((format[index] == '6') &&
              (format[index + 1] == '4'))
            {
              varsize = sizeof(trio_int64_t);
              index += 2;
            }
          else if ((format[index] == '3') &&
               (format[index + 1] == '2'))
            {
              varsize = sizeof(trio_int32_t);
              index += 2;
            }
          else if ((format[index] == '1') &&
               (format[index + 1] == '6'))
            {
              varsize = sizeof(trio_int16_t);
              index += 2;
            }
          else if (format[index] == '8')
            {
              varsize = sizeof(trio_int8_t);
              index++;
            }
          else
            return TRIO_ERROR_RETURN(TRIO_EINVAL, index);
          
          flags |= FLAGS_FIXED_SIZE;
          break;
#endif

#if defined(QUALIFIER_WIDECHAR)
        case QUALIFIER_WIDECHAR:
          flags |= FLAGS_WIDECHAR;
          break;
#endif

#if defined(QUALIFIER_SIZE_T_UPPER)
        case QUALIFIER_SIZE_T_UPPER:
          break;
#endif

#if defined(QUALIFIER_QUOTE)
        case QUALIFIER_QUOTE:
          flags |= FLAGS_QUOTE;
          break;
#endif

#if defined(QUALIFIER_STICKY)
        case QUALIFIER_STICKY:
          flags |= FLAGS_STICKY;
          gotSticky = TRUE;
          break;
#endif
          
#if defined(QUALIFIER_VARSIZE)
        case QUALIFIER_VARSIZE:
          flags |= FLAGS_VARSIZE_PARAMETER;
          parameterPosition++;
          if (positional)
            varsize = parameterPosition;
          else
            {
              varsize = currentParam;
              currentParam = varsize + 1;
            }
          if (currentParam > maxParam)
            maxParam = currentParam;
          break;
#endif

#if defined(QUALIFIER_ROUNDING_UPPER)
        case QUALIFIER_ROUNDING_UPPER:
          flags |= FLAGS_ROUNDING;
          break;
#endif

        default:
          /* Bail out completely to make the error more obvious */
                  return TRIO_ERROR_RETURN(TRIO_EINVAL, index);
        }
        } /* while qualifier */

      /*
       * Parameters only need the type and value. The value is
       * read later.
       */
      if (flags & FLAGS_WIDTH_PARAMETER)
        {
          usedEntries[width] += 1;
          parameters[pos].type = FORMAT_PARAMETER;
          parameters[pos].flags = 0;
          indices[width] = pos;
          width = pos++;
        }
      if (flags & FLAGS_PRECISION_PARAMETER)
        {
          usedEntries[precision] += 1;
          parameters[pos].type = FORMAT_PARAMETER;
          parameters[pos].flags = 0;
          indices[precision] = pos;
          precision = pos++;
        }
      if (flags & FLAGS_BASE_PARAMETER)
        {
          usedEntries[base] += 1;
          parameters[pos].type = FORMAT_PARAMETER;
          parameters[pos].flags = 0;
          indices[base] = pos;
          base = pos++;
        }
      if (flags & FLAGS_VARSIZE_PARAMETER)
        {
          usedEntries[varsize] += 1;
          parameters[pos].type = FORMAT_PARAMETER;
          parameters[pos].flags = 0;
          indices[varsize] = pos;
          varsize = pos++;
        }
      
      indices[currentParam] = pos;
      
      switch (format[index++])
        {
#if defined(SPECIFIER_CHAR_UPPER)
        case SPECIFIER_CHAR_UPPER:
          flags |= FLAGS_WIDECHAR;
          /* FALLTHROUGH */
#endif
        case SPECIFIER_CHAR:
          if (flags & FLAGS_LONG)
        flags |= FLAGS_WIDECHAR;
          else if (flags & FLAGS_SHORT)
        flags &= ~FLAGS_WIDECHAR;
          parameters[pos].type = FORMAT_CHAR;
          break;

#if defined(SPECIFIER_STRING_UPPER)
        case SPECIFIER_STRING_UPPER:
          flags |= FLAGS_WIDECHAR;
          /* FALLTHROUGH */
#endif
        case SPECIFIER_STRING:
          if (flags & FLAGS_LONG)
        flags |= FLAGS_WIDECHAR;
          else if (flags & FLAGS_SHORT)
        flags &= ~FLAGS_WIDECHAR;
          parameters[pos].type = FORMAT_STRING;
          break;

        case SPECIFIER_GROUP:
          if (TYPE_SCAN == type)
        {
          int depth = 1;
          parameters[pos].type = FORMAT_GROUP;
          if (format[index] == QUALIFIER_CIRCUMFLEX)
            index++;
          if (format[index] == SPECIFIER_UNGROUP)
            index++;
          if (format[index] == QUALIFIER_MINUS)
            index++;
          /* Skip nested brackets */
          while (format[index] != NIL)
            {
              if (format[index] == SPECIFIER_GROUP)
            {
              depth++;
            }
              else if (format[index] == SPECIFIER_UNGROUP)
            {
              if (--depth <= 0)
                {
                  index++;
                  break;
                }
            }
              index++;
            }
        }
          break;
          
        case SPECIFIER_INTEGER:
          parameters[pos].type = FORMAT_INT;
          break;
          
        case SPECIFIER_UNSIGNED:
          flags |= FLAGS_UNSIGNED;
          parameters[pos].type = FORMAT_INT;
          break;

        case SPECIFIER_DECIMAL:
          /* Disable base modifier */
          flags &= ~FLAGS_BASE_PARAMETER;
          base = BASE_DECIMAL;
          parameters[pos].type = FORMAT_INT;
          break;

        case SPECIFIER_OCTAL:
          flags |= FLAGS_UNSIGNED;
          flags &= ~FLAGS_BASE_PARAMETER;
          base = BASE_OCTAL;
          parameters[pos].type = FORMAT_INT;
          break;

#if defined(SPECIFIER_BINARY)
        case SPECIFIER_BINARY_UPPER:
          flags |= FLAGS_UPPER;
          /* FALLTHROUGH */
        case SPECIFIER_BINARY:
          flags |= FLAGS_NILPADDING;
          flags &= ~FLAGS_BASE_PARAMETER;
          base = BASE_BINARY;
          parameters[pos].type = FORMAT_INT;
          break;
#endif

        case SPECIFIER_HEX_UPPER:
          flags |= FLAGS_UPPER;
          /* FALLTHROUGH */
        case SPECIFIER_HEX:
          flags |= FLAGS_UNSIGNED;
          flags &= ~FLAGS_BASE_PARAMETER;
          base = BASE_HEX;
          parameters[pos].type = FORMAT_INT;
          break;

        case SPECIFIER_FLOAT_E_UPPER:
          flags |= FLAGS_UPPER;
          /* FALLTHROUGH */
        case SPECIFIER_FLOAT_E:
          flags |= FLAGS_FLOAT_E;
          parameters[pos].type = FORMAT_DOUBLE;
          break;

        case SPECIFIER_FLOAT_G_UPPER:
          flags |= FLAGS_UPPER;
          /* FALLTHROUGH */
        case SPECIFIER_FLOAT_G:
          flags |= FLAGS_FLOAT_G;
          parameters[pos].type = FORMAT_DOUBLE;
          break;

        case SPECIFIER_FLOAT_F_UPPER:
          flags |= FLAGS_UPPER;
          /* FALLTHROUGH */
        case SPECIFIER_FLOAT_F:
          parameters[pos].type = FORMAT_DOUBLE;
          break;

        case SPECIFIER_POINTER:
          if (sizeof(trio_pointer_t) == sizeof(trio_ulonglong_t))
        flags |= FLAGS_QUAD;
          else if (sizeof(trio_pointer_t) == sizeof(long))
        flags |= FLAGS_LONG;
          parameters[pos].type = FORMAT_POINTER;
          break;

        case SPECIFIER_COUNT:
          parameters[pos].type = FORMAT_COUNT;
          break;

#if defined(SPECIFIER_HEXFLOAT)
# if defined(SPECIFIER_HEXFLOAT_UPPER)
        case SPECIFIER_HEXFLOAT_UPPER:
          flags |= FLAGS_UPPER;
          /* FALLTHROUGH */
# endif
        case SPECIFIER_HEXFLOAT:
          base = BASE_HEX;
          parameters[pos].type = FORMAT_DOUBLE;
          break;
#endif

#if defined(FORMAT_ERRNO)
        case SPECIFIER_ERRNO:
          parameters[pos].type = FORMAT_ERRNO;
          break;
#endif

#if defined(SPECIFIER_USER_DEFINED_BEGIN)
        case SPECIFIER_USER_DEFINED_BEGIN:
          {
        unsigned int max;
        int without_namespace = TRUE;
        
        parameters[pos].type = FORMAT_USER_DEFINED;
        parameters[pos].user_name[0] = NIL;
        tmpformat = (char *)&format[index];
          
        while ((ch = format[index]))
          {
            index++;
            if (ch == SPECIFIER_USER_DEFINED_END)
              {
            if (without_namespace)
              {
                /* We must get the handle first */
                parameters[pos].type = FORMAT_PARAMETER;
                parameters[pos].indexAfterSpecifier = index;
                parameters[pos].flags = FLAGS_USER_DEFINED;
                /* Adjust parameters for insertion of new one */
                pos++;
                usedEntries[currentParam] += 1;
                parameters[pos].type = FORMAT_USER_DEFINED;
                currentParam++;
                indices[currentParam] = pos;
                if (currentParam > maxParam)
                  maxParam = currentParam;
              }
            /* Copy the user data */
            max = (unsigned int)(&format[index] - tmpformat);
            if (max > MAX_USER_DATA)
              max = MAX_USER_DATA;
            trio_copy_max(parameters[pos].user_data,
                      max,
                      tmpformat);
            break; /* while */
              }
            if (ch == SPECIFIER_USER_DEFINED_SEPARATOR)
              {
            without_namespace = FALSE;
            /* Copy the namespace for later looking-up */
            max = (int)(&format[index] - tmpformat);
            if (max > MAX_USER_NAME)
              max = MAX_USER_NAME;
            trio_copy_max(parameters[pos].user_name,
                      max,
                      tmpformat);
            tmpformat = (char *)&format[index];
              }
          }
        if (ch != SPECIFIER_USER_DEFINED_END)
          return TRIO_ERROR_RETURN(TRIO_EINVAL, index);
          }
          break;
#endif /* defined(SPECIFIER_USER_DEFINED_BEGIN) */
          
        default:
          /* Bail out completely to make the error more obvious */
              return TRIO_ERROR_RETURN(TRIO_EINVAL, index);
        }

      /*  Count the number of times this entry has been used */
      usedEntries[currentParam] += 1;
      
      /* Find last sticky parameters */
      if (gotSticky && !(flags & FLAGS_STICKY))
        {
          for (i = pos - 1; i >= 0; i--)
        {
          if (parameters[i].type == FORMAT_PARAMETER)
            continue;
          if ((parameters[i].flags & FLAGS_STICKY) &&
              (parameters[i].type == parameters[pos].type))
            {
              /* Do not overwrite current qualifiers */
              flags |= (parameters[i].flags & (unsigned long)~FLAGS_STICKY);
              if (width == NO_WIDTH)
            width = parameters[i].width;
              if (precision == NO_PRECISION)
            precision = parameters[i].precision;
              if (base == NO_BASE)
            base = parameters[i].base;
              break;
            }
        }
        }
      
      parameters[pos].indexAfterSpecifier = index;
      parameters[pos].flags = flags;
      parameters[pos].width = width;
      parameters[pos].precision = precision;
      parameters[pos].base = (base == NO_BASE) ? BASE_DECIMAL : base;
      parameters[pos].varsize = varsize;
      pos++;
      
      if (! positional)
        parameterPosition++;
      
    } /* if identifier */
      
    } /* while format characters left */

  for (num = 0; num <= maxParam; num++)
    {
      if (usedEntries[num] != 1)
    {
      if (usedEntries[num] == 0) /* gap detected */
        return TRIO_ERROR_RETURN(TRIO_EGAP, num);
      else /* double references detected */
        return TRIO_ERROR_RETURN(TRIO_EDBLREF, num);
    }
      
      i = indices[num];

      /*
       * FORMAT_PARAMETERS are only present if they must be read,
       * so it makes no sense to check the ignore flag (besides,
       * the flags variable is not set for that particular type)
       */
      if ((parameters[i].type != FORMAT_PARAMETER) &&
      (parameters[i].flags & FLAGS_IGNORE))
    continue; /* for all arguments */

      /*
       * The stack arguments are read according to ANSI C89
       * default argument promotions:
       *
       *  char           = int
       *  short          = int
       *  unsigned char  = unsigned int
       *  unsigned short = unsigned int
       *  float          = double
       *
       * In addition to the ANSI C89 these types are read (the
       * default argument promotions of C99 has not been
       * considered yet)
       *
       *  long long
       *  long double
       *  size_t
       *  ptrdiff_t
       *  intmax_t
       */
      switch (parameters[i].type)
    {
    case FORMAT_GROUP:
    case FORMAT_STRING:
#if TRIO_WIDECHAR
      if (flags & FLAGS_WIDECHAR)
        {
          parameters[i].data.wstring = (argarray == NULL)
        ? va_arg(*arglist, trio_wchar_t *)
        : (trio_wchar_t *)(argarray[num]);
        }
      else
#endif
        {
          parameters[i].data.string = (argarray == NULL)
        ? va_arg(*arglist, char *)
        : (char *)(argarray[num]);
        }
      break;

#if defined(FORMAT_USER_DEFINED)
    case FORMAT_USER_DEFINED:
#endif
    case FORMAT_POINTER:
    case FORMAT_COUNT:
    case FORMAT_UNKNOWN:
      parameters[i].data.pointer = (argarray == NULL)
        ? va_arg(*arglist, trio_pointer_t )
        : argarray[num];
      break;

    case FORMAT_CHAR:
    case FORMAT_INT:
      if (TYPE_SCAN == type)
        {
              if (argarray == NULL)
                parameters[i].data.pointer = 
                  (trio_pointer_t)va_arg(*arglist, trio_pointer_t);
              else
                {
                  if (parameters[i].type == FORMAT_CHAR)
                    parameters[i].data.pointer =
                      (trio_pointer_t)((char *)argarray[num]);
                  else if (parameters[i].flags & FLAGS_SHORT)
                    parameters[i].data.pointer =
                      (trio_pointer_t)((short *)argarray[num]);
                  else
                    parameters[i].data.pointer =
                      (trio_pointer_t)((int *)argarray[num]);
                }
        }
      else
        {
#if defined(QUALIFIER_VARSIZE) || defined(QUALIFIER_FIXED_SIZE)
          if (parameters[i].flags
          & (FLAGS_VARSIZE_PARAMETER | FLAGS_FIXED_SIZE))
        {
          if (parameters[i].flags & FLAGS_VARSIZE_PARAMETER)
            {
              /*
               * Variable sizes are mapped onto the fixed sizes, in
               * accordance with integer promotion.
               *
               * Please note that this may not be portable, as we
               * only guess the size, not the layout of the numbers.
               * For example, if int is little-endian, and long is
               * big-endian, then this will fail.
               */
              varsize = (int)parameters[parameters[i].varsize].data.number.as_unsigned;
            }
          else
            {
              /* Used for the I<bits> modifiers */
              varsize = parameters[i].varsize;
            }
          parameters[i].flags &= ~FLAGS_ALL_VARSIZES;
          
          if (varsize <= (int)sizeof(int))
            ;
          else if (varsize <= (int)sizeof(long))
            parameters[i].flags |= FLAGS_LONG;
#if defined(QUALIFIER_INTMAX_T)
          else if (varsize <= (int)sizeof(trio_longlong_t))
            parameters[i].flags |= FLAGS_QUAD;
          else
            parameters[i].flags |= FLAGS_INTMAX_T;
#else
          else
            parameters[i].flags |= FLAGS_QUAD;
#endif
        }
#endif /* defined(QUALIFIER_VARSIZE) */
#if defined(QUALIFIER_SIZE_T) || defined(QUALIFIER_SIZE_T_UPPER)
          if (parameters[i].flags & FLAGS_SIZE_T)
        parameters[i].data.number.as_unsigned = (argarray == NULL)
          ? (trio_uintmax_t)va_arg(*arglist, size_t)
          : (trio_uintmax_t)(*((size_t *)argarray[num]));
          else
#endif
#if defined(QUALIFIER_PTRDIFF_T)
          if (parameters[i].flags & FLAGS_PTRDIFF_T)
        parameters[i].data.number.as_unsigned = (argarray == NULL)
          ? (trio_uintmax_t)va_arg(*arglist, ptrdiff_t)
          : (trio_uintmax_t)(*((ptrdiff_t *)argarray[num]));
          else
#endif
#if defined(QUALIFIER_INTMAX_T)
          if (parameters[i].flags & FLAGS_INTMAX_T)
        parameters[i].data.number.as_unsigned = (argarray == NULL)
          ? (trio_uintmax_t)va_arg(*arglist, trio_intmax_t)
          : (trio_uintmax_t)(*((trio_intmax_t *)argarray[num]));
          else
#endif
          if (parameters[i].flags & FLAGS_QUAD)
        parameters[i].data.number.as_unsigned = (argarray == NULL)
          ? (trio_uintmax_t)va_arg(*arglist, trio_ulonglong_t)
          : (trio_uintmax_t)(*((trio_ulonglong_t *)argarray[num]));
          else if (parameters[i].flags & FLAGS_LONG)
        parameters[i].data.number.as_unsigned = (argarray == NULL)
          ? (trio_uintmax_t)va_arg(*arglist, long)
          : (trio_uintmax_t)(*((long *)argarray[num]));
          else
        {
          if (argarray == NULL)
            parameters[i].data.number.as_unsigned = (trio_uintmax_t)va_arg(*arglist, int);
          else
            {
              if (parameters[i].type == FORMAT_CHAR)
            parameters[i].data.number.as_unsigned = (trio_uintmax_t)(*((char *)argarray[num]));
              else if (parameters[i].flags & FLAGS_SHORT)
            parameters[i].data.number.as_unsigned = (trio_uintmax_t)(*((short *)argarray[num]));
              else
            parameters[i].data.number.as_unsigned = (trio_uintmax_t)(*((int *)argarray[num]));
            }
        }
        }
      break;

    case FORMAT_PARAMETER:
      /*
       * The parameter for the user-defined specifier is a pointer,
       * whereas the rest (width, precision, base) uses an integer.
       */
      if (parameters[i].flags & FLAGS_USER_DEFINED)
        parameters[i].data.pointer = (argarray == NULL)
          ? va_arg(*arglist, trio_pointer_t )
          : argarray[num];
      else
        parameters[i].data.number.as_unsigned = (argarray == NULL)
          ? (trio_uintmax_t)va_arg(*arglist, int)
          : (trio_uintmax_t)(*((int *)argarray[num]));
      break;

    case FORMAT_DOUBLE:
      if (TYPE_SCAN == type)
        {
          if (parameters[i].flags & FLAGS_LONGDOUBLE)
        parameters[i].data.longdoublePointer = (argarray == NULL)
          ? va_arg(*arglist, trio_long_double_t *)
          : (trio_long_double_t *)argarray[num];
          else
                {
          if (parameters[i].flags & FLAGS_LONG)
            parameters[i].data.doublePointer = (argarray == NULL)
              ? va_arg(*arglist, double *)
              : (double *)argarray[num];
          else
            parameters[i].data.doublePointer = (argarray == NULL)
              ? (double *)va_arg(*arglist, float *)
              : (double *)((float *)argarray[num]);
                }
        }
      else
        {
          if (parameters[i].flags & FLAGS_LONGDOUBLE)
        parameters[i].data.longdoubleNumber = (argarray == NULL)
          ? va_arg(*arglist, trio_long_double_t)
          : (trio_long_double_t)(*((trio_long_double_t *)argarray[num]));
          else
        {
          if (argarray == NULL)
            parameters[i].data.longdoubleNumber =
              (trio_long_double_t)va_arg(*arglist, double);
          else
            {
              if (parameters[i].flags & FLAGS_SHORT)
            parameters[i].data.longdoubleNumber =
              (trio_long_double_t)(*((float *)argarray[num]));
              else
            parameters[i].data.longdoubleNumber =
              (trio_long_double_t)(*((double *)argarray[num]));
            }
        }
        }
      break;

#if defined(FORMAT_ERRNO)
    case FORMAT_ERRNO:
      parameters[i].data.errorNumber = save_errno;
      break;
#endif

    default:
      break;
    }
    } /* for all specifiers */
  return num;
}


/*************************************************************************
 *
 * FORMATTING
 *
 ************************************************************************/


/*************************************************************************
 * TrioWriteNumber
 *
 * Description:
 *  Output a number.
 *  The complexity of this function is a result of the complexity
 *  of the dependencies of the flags.
 */
TRIO_PRIVATE void
TrioWriteNumber
TRIO_ARGS6((self, number, flags, width, precision, base),
       trio_class_t *self,
       trio_uintmax_t number,
       trio_flags_t flags,
       int width,
       int precision,
       int base)
{
  BOOLEAN_T isNegative;
  BOOLEAN_T isNumberZero;
  BOOLEAN_T isPrecisionZero;
  BOOLEAN_T ignoreNumber;
  char buffer[MAX_CHARS_IN(trio_uintmax_t) * (1 + MAX_LOCALE_SEPARATOR_LENGTH) + 1];
  char *bufferend;
  char *pointer;
  TRIO_CONST char *digits;
  int i;
  int length;
  char *p;
  int count;

  assert(VALID(self));
  assert(VALID(self->OutStream));
  assert(((base >= MIN_BASE) && (base <= MAX_BASE)) || (base == NO_BASE));

  digits = (flags & FLAGS_UPPER) ? internalDigitsUpper : internalDigitsLower;
  if (base == NO_BASE)
    base = BASE_DECIMAL;

  isNumberZero = (number == 0);
  isPrecisionZero = (precision == 0);
  ignoreNumber = (isNumberZero
          && isPrecisionZero
          && !((flags & FLAGS_ALTERNATIVE) && (base == BASE_OCTAL)));

  if (flags & FLAGS_UNSIGNED)
    {
      isNegative = FALSE;
      flags &= ~FLAGS_SHOWSIGN;
    }
  else
    {
      isNegative = ((trio_intmax_t)number < 0);
      if (isNegative)
    number = -((trio_intmax_t)number);
    }

  if (flags & FLAGS_QUAD)
    number &= (trio_ulonglong_t)-1;
  else if (flags & FLAGS_LONG)
    number &= (unsigned long)-1;
  else
    number &= (unsigned int)-1;
  
  /* Build number */
  pointer = bufferend = &buffer[sizeof(buffer) - 1];
  *pointer-- = NIL;
  for (i = 1; i < (int)sizeof(buffer); i++)
    {
      *pointer-- = digits[number % base];
      number /= base;
      if (number == 0)
    break;

      if ((flags & FLAGS_QUOTE) && TrioFollowedBySeparator(i + 1))
    {
      /*
       * We are building the number from the least significant
       * to the most significant digit, so we have to copy the
       * thousand separator backwards
       */
      length = internalThousandSeparatorLength;
      if (((int)(pointer - buffer) - length) > 0)
        {
          p = &internalThousandSeparator[length - 1];
          while (length-- > 0)
        *pointer-- = *p--;
        }
    }
    }

  if (! ignoreNumber)
    {
      /* Adjust width */
      width -= (bufferend - pointer) - 1;
    }

  /* Adjust precision */
  if (NO_PRECISION != precision)
    {
      precision -= (bufferend - pointer) - 1;
      if (precision < 0)
    precision = 0;
      flags |= FLAGS_NILPADDING;
    }

  /* Calculate padding */
  count = (! ((flags & FLAGS_LEFTADJUST) || (precision == NO_PRECISION)))
    ? precision
    : 0;
  
  /* Adjust width further */
  if (isNegative || (flags & FLAGS_SHOWSIGN) || (flags & FLAGS_SPACE))
    width--;
  if ((flags & FLAGS_ALTERNATIVE) && !isNumberZero)
    {
      switch (base)
    {
    case BASE_BINARY:
    case BASE_HEX:
      width -= 2;
      break;
    case BASE_OCTAL:
      if (!(flags & FLAGS_NILPADDING) || (count == 0))
        width--;
      break;
    default:
      break;
    }
    }

  /* Output prefixes spaces if needed */
  if (! ((flags & FLAGS_LEFTADJUST) ||
     ((flags & FLAGS_NILPADDING) && (precision == NO_PRECISION))))
    {
      while (width-- > count)
    self->OutStream(self, CHAR_ADJUST);
    }

  /* width has been adjusted for signs and alternatives */
  if (isNegative)
    self->OutStream(self, '-');
  else if (flags & FLAGS_SHOWSIGN)
    self->OutStream(self, '+');
  else if (flags & FLAGS_SPACE)
    self->OutStream(self, ' ');

  /* Prefix is not written when the value is zero */
  if ((flags & FLAGS_ALTERNATIVE) && !isNumberZero)
    {
      switch (base)
    {
    case BASE_BINARY:
      self->OutStream(self, '0');
      self->OutStream(self, (flags & FLAGS_UPPER) ? 'B' : 'b');
      break;

    case BASE_OCTAL:
      if (!(flags & FLAGS_NILPADDING) || (count == 0))
        self->OutStream(self, '0');
      break;

    case BASE_HEX:
      self->OutStream(self, '0');
      self->OutStream(self, (flags & FLAGS_UPPER) ? 'X' : 'x');
      break;

    default:
      break;
    } /* switch base */
    }

  /* Output prefixed zero padding if needed */
  if (flags & FLAGS_NILPADDING)
    {
      if (precision == NO_PRECISION)
    precision = width;
      while (precision-- > 0)
    {
      self->OutStream(self, '0');
      width--;
    }
    }

  if (! ignoreNumber)
    {
      /* Output the number itself */
      while (*(++pointer))
    {
      self->OutStream(self, *pointer);
    }
    }

  /* Output trailing spaces if needed */
  if (flags & FLAGS_LEFTADJUST)
    {
      while (width-- > 0)
    self->OutStream(self, CHAR_ADJUST);
    }
}

/*************************************************************************
 * TrioWriteStringCharacter
 *
 * Description:
 *  Output a single character of a string
 */
TRIO_PRIVATE void
TrioWriteStringCharacter
TRIO_ARGS3((self, ch, flags),
       trio_class_t *self,
       int ch,
       trio_flags_t flags)
{
  if (flags & FLAGS_ALTERNATIVE)
    {
      if (! isprint(ch))
    {
      /*
       * Non-printable characters are converted to C escapes or
       * \number, if no C escape exists.
       */
      self->OutStream(self, CHAR_BACKSLASH);
      switch (ch)
        {
        case '\007': self->OutStream(self, 'a'); break;
        case '\b': self->OutStream(self, 'b'); break;
        case '\f': self->OutStream(self, 'f'); break;
        case '\n': self->OutStream(self, 'n'); break;
        case '\r': self->OutStream(self, 'r'); break;
        case '\t': self->OutStream(self, 't'); break;
        case '\v': self->OutStream(self, 'v'); break;
        case '\\': self->OutStream(self, '\\'); break;
        default:
          self->OutStream(self, 'x');
          TrioWriteNumber(self, (trio_uintmax_t)ch,
                  FLAGS_UNSIGNED | FLAGS_NILPADDING,
                  2, 2, BASE_HEX);
          break;
        }
    }
      else if (ch == CHAR_BACKSLASH)
    {
      self->OutStream(self, CHAR_BACKSLASH);
      self->OutStream(self, CHAR_BACKSLASH);
    }
      else
    {
      self->OutStream(self, ch);
    }
    }
  else
    {
      self->OutStream(self, ch);
    }
}

/*************************************************************************
 * TrioWriteString
 *
 * Description:
 *  Output a string
 */
TRIO_PRIVATE void
TrioWriteString
TRIO_ARGS5((self, string, flags, width, precision),
       trio_class_t *self,
       TRIO_CONST char *string,
       trio_flags_t flags,
       int width,
       int precision)
{
  int length;
  int ch;

  assert(VALID(self));
  assert(VALID(self->OutStream));

  if (string == NULL)
    {
      string = internalNullString;
      length = sizeof(internalNullString) - 1;
      /* Disable quoting for the null pointer */
      flags &= (~FLAGS_QUOTE);
      width = 0;
    }
  else
    {
      length = trio_length(string);
    }
  if ((NO_PRECISION != precision) &&
      (precision < length))
    {
      length = precision;
    }
  width -= length;

  if (flags & FLAGS_QUOTE)
    self->OutStream(self, CHAR_QUOTE);

  if (! (flags & FLAGS_LEFTADJUST))
    {
      while (width-- > 0)
    self->OutStream(self, CHAR_ADJUST);
    }

  while (length-- > 0)
    {
      /* The ctype parameters must be an unsigned char (or EOF) */
      ch = (int)((unsigned char)(*string++));
      TrioWriteStringCharacter(self, ch, flags);
    }

  if (flags & FLAGS_LEFTADJUST)
    {
      while (width-- > 0)
    self->OutStream(self, CHAR_ADJUST);
    }
  if (flags & FLAGS_QUOTE)
    self->OutStream(self, CHAR_QUOTE);
}

/*************************************************************************
 * TrioWriteWideStringCharacter
 *
 * Description:
 *  Output a wide string as a multi-byte sequence
 */
#if TRIO_WIDECHAR
TRIO_PRIVATE int
TrioWriteWideStringCharacter
TRIO_ARGS4((self, wch, flags, width),
       trio_class_t *self,
       trio_wchar_t wch,
       trio_flags_t flags,
       int width)
{
  int size;
  int i;
  int ch;
  char *string;
  char buffer[MB_LEN_MAX + 1];

  if (width == NO_WIDTH)
    width = sizeof(buffer);
  
  size = wctomb(buffer, wch);
  if ((size <= 0) || (size > width) || (buffer[0] == NIL))
    return 0;

  string = buffer;
  i = size;
  while ((width >= i) && (width-- > 0) && (i-- > 0))
    {
      /* The ctype parameters must be an unsigned char (or EOF) */
      ch = (int)((unsigned char)(*string++));
      TrioWriteStringCharacter(self, ch, flags);
    }
  return size;
}
#endif /* TRIO_WIDECHAR */

/*************************************************************************
 * TrioWriteWideString
 *
 * Description:
 *  Output a wide character string as a multi-byte string
 */
#if TRIO_WIDECHAR
TRIO_PRIVATE void
TrioWriteWideString
TRIO_ARGS5((self, wstring, flags, width, precision),
       trio_class_t *self,
       TRIO_CONST trio_wchar_t *wstring,
       trio_flags_t flags,
       int width,
       int precision)
{
  int length;
  int size;

  assert(VALID(self));
  assert(VALID(self->OutStream));

#if defined(TRIO_COMPILER_SUPPORTS_MULTIBYTE)
  (void)mblen(NULL, 0);
#endif
  
  if (wstring == NULL)
    {
      TrioWriteString(self, NULL, flags, width, precision);
      return;
    }
  
  if (NO_PRECISION == precision)
    {
      length = INT_MAX;
    }
  else
    {
      length = precision;
      width -= length;
    }

  if (flags & FLAGS_QUOTE)
    self->OutStream(self, CHAR_QUOTE);

  if (! (flags & FLAGS_LEFTADJUST))
    {
      while (width-- > 0)
    self->OutStream(self, CHAR_ADJUST);
    }

  while (length > 0)
    {
      size = TrioWriteWideStringCharacter(self, *wstring++, flags, length);
      if (size == 0)
    break; /* while */
      length -= size;
    }

  if (flags & FLAGS_LEFTADJUST)
    {
      while (width-- > 0)
    self->OutStream(self, CHAR_ADJUST);
    }
  if (flags & FLAGS_QUOTE)
    self->OutStream(self, CHAR_QUOTE);
}
#endif /* TRIO_WIDECHAR */

/*************************************************************************
 * TrioWriteDouble
 *
 * http://wwwold.dkuug.dk/JTC1/SC22/WG14/www/docs/dr_211.htm
 *
 * "5.2.4.2.2 paragraph #4
 *
 *  The accuracy [...] is implementation defined, as is the accuracy
 *  of the conversion between floating-point internal representations
 *  and string representations performed by the libray routine in
 *  <stdio.h>"
 */
/* FIXME: handle all instances of constant long-double number (L)
 *   and *l() math functions.
 */
TRIO_PRIVATE void
TrioWriteDouble
TRIO_ARGS6((self, number, flags, width, precision, base),
       trio_class_t *self,
       trio_long_double_t number,
       trio_flags_t flags,
       int width,
       int precision,
       int base)
{
  trio_long_double_t integerNumber;
  trio_long_double_t fractionNumber;
  trio_long_double_t workNumber;
  int integerDigits;
  int fractionDigits;
  int exponentDigits;
  int baseDigits;
  int integerThreshold;
  int fractionThreshold;
  int expectedWidth;
  int exponent = 0;
  unsigned int uExponent = 0;
  int exponentBase;
  trio_long_double_t dblBase;
  trio_long_double_t dblIntegerBase;
  trio_long_double_t dblFractionBase;
  trio_long_double_t integerAdjust;
  trio_long_double_t fractionAdjust;
  BOOLEAN_T isNegative;
  BOOLEAN_T isExponentNegative = FALSE;
  BOOLEAN_T requireTwoDigitExponent;
  BOOLEAN_T isHex;
  TRIO_CONST char *digits;
  char *groupingPointer;
  int i;
  int index;
  BOOLEAN_T hasOnlyZeroes;
  int zeroes = 0;
  register int trailingZeroes;
  BOOLEAN_T keepTrailingZeroes;
  BOOLEAN_T keepDecimalPoint;
  trio_long_double_t epsilon;
  
  assert(VALID(self));
  assert(VALID(self->OutStream));
  assert(((base >= MIN_BASE) && (base <= MAX_BASE)) || (base == NO_BASE));

  /* Determine sign and look for special quantities */
  switch (trio_fpclassify_and_signbit(number, &isNegative))
    {
    case TRIO_FP_NAN:
      TrioWriteString(self,
              (flags & FLAGS_UPPER)
              ? NAN_UPPER
              : NAN_LOWER,
              flags, width, precision);
      return;
      
    case TRIO_FP_INFINITE:
      if (isNegative)
    {
      /* Negative infinity */
      TrioWriteString(self,
              (flags & FLAGS_UPPER)
              ? "-" INFINITE_UPPER
              : "-" INFINITE_LOWER,
              flags, width, precision);
      return;
    }
      else
    {
      /* Positive infinity */
      TrioWriteString(self,
              (flags & FLAGS_UPPER)
              ? INFINITE_UPPER
              : INFINITE_LOWER,
              flags, width, precision);
      return;
    }

    default:
      /* Finitude */
      break;
    }
  
  /* Normal numbers */
  if (flags & FLAGS_LONGDOUBLE)
    {
      baseDigits = (base == 10)
    ? LDBL_DIG
    : (int)floor(LDBL_MANT_DIG / TrioLogarithmBase(base));
      epsilon = LDBL_EPSILON;
    }
  else if (flags & FLAGS_SHORT)
    {
      baseDigits = (base == BASE_DECIMAL)
    ? FLT_DIG
    : (int)floor(FLT_MANT_DIG / TrioLogarithmBase(base));
      epsilon = FLT_EPSILON;
    }
  else
    {
      baseDigits = (base == BASE_DECIMAL)
    ? DBL_DIG
    : (int)floor(DBL_MANT_DIG / TrioLogarithmBase(base));
      epsilon = DBL_EPSILON;
    }

  digits = (flags & FLAGS_UPPER) ? internalDigitsUpper : internalDigitsLower;
  isHex = (base == BASE_HEX);
  if (base == NO_BASE)
    base = BASE_DECIMAL;
  dblBase = (trio_long_double_t)base;
  keepTrailingZeroes = !( (flags & FLAGS_ROUNDING) ||
              ( (flags & FLAGS_FLOAT_G) &&
                !(flags & FLAGS_ALTERNATIVE) ) );

  if (flags & FLAGS_ROUNDING)
    precision = baseDigits;

  if (precision == NO_PRECISION)
    {
      if (isHex)
    {
      keepTrailingZeroes = FALSE;
      precision = FLT_MANT_DIG;
    }
      else
    {
      precision = FLT_DIG;
    }
    }
  
  if (isNegative)
    number = -number;

  if (isHex)
    flags |= FLAGS_FLOAT_E;
  
  if (flags & FLAGS_FLOAT_G)
    {
      if (precision == 0)
    precision = 1;

      if ((number < 1.0E-4) || (number > powl(base,
                          (trio_long_double_t)precision)))
    {
      /* Use scientific notation */
      flags |= FLAGS_FLOAT_E;
    }
      else if (number < 1.0)
    {
      /*
       * Use normal notation. If the integer part of the number is
       * zero, then adjust the precision to include leading fractional
       * zeros.
       */
      workNumber = TrioLogarithm(number, base);
      workNumber = TRIO_FABS(workNumber);
      if (workNumber - floorl(workNumber) < 0.001)
        workNumber--;
      zeroes = (int)floorl(workNumber);
    }
    }

  if (flags & FLAGS_FLOAT_E)
    {
      /* Scale the number */
      workNumber = TrioLogarithm(number, base);
      if (trio_isinf(workNumber) == -1)
    {
      exponent = 0;
      /* Undo setting */
      if (flags & FLAGS_FLOAT_G)
        flags &= ~FLAGS_FLOAT_E;
    }
      else
    {
      exponent = (int)floorl(workNumber);
      number /= powl(dblBase, (trio_long_double_t)exponent);
      isExponentNegative = (exponent < 0);
      uExponent = (isExponentNegative) ? -exponent : exponent;
      if (isHex)
        uExponent *= 4; /* log16(2) */
      /* No thousand separators */
      flags &= ~FLAGS_QUOTE;
    }
    }

  integerNumber = floorl(number);
  fractionNumber = number - integerNumber;
  
  /*
   * Truncated number.
   *
   * Precision is number of significant digits for FLOAT_G
   * and number of fractional digits for others.
   */
  integerDigits = (integerNumber > epsilon)
    ? 1 + (int)TrioLogarithm(integerNumber, base)
    : 1;
  fractionDigits = ((flags & FLAGS_FLOAT_G) && (zeroes == 0))
    ? precision - integerDigits
    : zeroes + precision;

  dblFractionBase = TrioPower(base, fractionDigits);
  
  workNumber = number + 0.5 / dblFractionBase;
  if (floorl(number) != floorl(workNumber))
    {
      if (flags & FLAGS_FLOAT_E)
    {
      /* Adjust if number was rounded up one digit (ie. 0.99 to 1.00) */
      exponent++;
      isExponentNegative = (exponent < 0);
      uExponent = (isExponentNegative) ? -exponent : exponent;
      if (isHex)
        uExponent *= 4; /* log16(2) */
      workNumber = (number + 0.5 / dblFractionBase) / dblBase;
      integerNumber = floorl(workNumber);
      fractionNumber = workNumber - integerNumber;
    }
      else
    {
      /* Adjust if number was rounded up one digit (ie. 99 to 100) */
      integerNumber = floorl(number + 0.5);
      fractionNumber = 0.0;
      integerDigits = (integerNumber > epsilon)
        ? 1 + (int)TrioLogarithm(integerNumber, base)
        : 1;
    }
    }

  /* Estimate accuracy */
  integerAdjust = fractionAdjust = 0.5;
  if (flags & FLAGS_ROUNDING)
    {
      if (integerDigits > baseDigits)
    {
      integerThreshold = baseDigits;
      fractionDigits = 0;
      dblFractionBase = 1.0;
      fractionThreshold = 0;
      precision = 0; /* Disable decimal-point */
      integerAdjust = TrioPower(base, integerDigits - integerThreshold - 1);
      fractionAdjust = 0.0;
    }
      else
    {
      integerThreshold = integerDigits;
      fractionThreshold = fractionDigits - integerThreshold;
      fractionAdjust = 1.0;
    }
    }
  else
    {
      integerThreshold = INT_MAX;
      fractionThreshold = INT_MAX;
    }
  
  /*
   * Calculate expected width.
   *  sign + integer part + thousands separators + decimal point
   *  + fraction + exponent
   */
  fractionAdjust /= dblFractionBase;
  hasOnlyZeroes = (floorl((fractionNumber + fractionAdjust) * dblFractionBase) < epsilon);
  keepDecimalPoint = ( (flags & FLAGS_ALTERNATIVE) ||
               !((precision == 0) ||
             (!keepTrailingZeroes && hasOnlyZeroes)) );
  if (flags & FLAGS_FLOAT_E)
    {
      exponentDigits = (uExponent == 0)
    ? 1
    : (int)ceil(TrioLogarithm((double)(uExponent + 1),
                  (isHex) ? 10.0 : base));
    }
  else
    exponentDigits = 0;
  requireTwoDigitExponent = ((base == BASE_DECIMAL) && (exponentDigits == 1));

  expectedWidth = integerDigits + fractionDigits
    + (keepDecimalPoint
       ? internalDecimalPointLength
       : 0)
    + ((flags & FLAGS_QUOTE)
       ? TrioCalcThousandSeparatorLength(integerDigits)
       : 0);
  if (isNegative || (flags & FLAGS_SHOWSIGN) || (flags & FLAGS_SPACE))
    expectedWidth += sizeof("-") - 1;
  if (exponentDigits > 0)
    expectedWidth += exponentDigits +
      ((requireTwoDigitExponent ? sizeof("E+0") : sizeof("E+")) - 1);
  if (isHex)
    expectedWidth += sizeof("0X") - 1;
  
  /* Output prefixing */
  if (flags & FLAGS_NILPADDING)
    {
      /* Leading zeros must be after sign */
      if (isNegative)
    self->OutStream(self, '-');
      else if (flags & FLAGS_SHOWSIGN)
    self->OutStream(self, '+');
      else if (flags & FLAGS_SPACE)
    self->OutStream(self, ' ');
      if (isHex)
    {
      self->OutStream(self, '0');
      self->OutStream(self, (flags & FLAGS_UPPER) ? 'X' : 'x');
    }
      if (!(flags & FLAGS_LEFTADJUST))
    {
      for (i = expectedWidth; i < width; i++)
        {
          self->OutStream(self, '0');
        }
    }
    }
  else
    {
      /* Leading spaces must be before sign */
      if (!(flags & FLAGS_LEFTADJUST))
    {
      for (i = expectedWidth; i < width; i++)
        {
          self->OutStream(self, CHAR_ADJUST);
        }
    }
      if (isNegative)
    self->OutStream(self, '-');
      else if (flags & FLAGS_SHOWSIGN)
    self->OutStream(self, '+');
      else if (flags & FLAGS_SPACE)
    self->OutStream(self, ' ');
      if (isHex)
    {
      self->OutStream(self, '0');
      self->OutStream(self, (flags & FLAGS_UPPER) ? 'X' : 'x');
    }
    }
  
  /* Output the integer part and thousand separators */
  dblIntegerBase = 1.0 / TrioPower(base, integerDigits - 1);
  for (i = 0; i < integerDigits; i++)
    {
      workNumber = floorl(((integerNumber + integerAdjust) * dblIntegerBase));
      if (i > integerThreshold)
    {
      /* Beyond accuracy */
      self->OutStream(self, digits[0]);
    }
      else
    {
      self->OutStream(self, digits[(int)fmodl(workNumber, dblBase)]);
    }
      dblIntegerBase *= dblBase;
      
      if (((flags & (FLAGS_FLOAT_E | FLAGS_QUOTE)) == FLAGS_QUOTE)
      && TrioFollowedBySeparator(integerDigits - i))
    {
      for (groupingPointer = internalThousandSeparator;
           *groupingPointer != NIL;
           groupingPointer++)
        {
          self->OutStream(self, *groupingPointer);
        }
    }
    }
  
  /* Insert decimal point and build the fraction part */
  trailingZeroes = 0;

  if (keepDecimalPoint)
    {
      if (internalDecimalPoint)
    {
      self->OutStream(self, internalDecimalPoint);
    }
      else
    {
      for (i = 0; i < internalDecimalPointLength; i++)
        {
          self->OutStream(self, internalDecimalPointString[i]);
        }
    }
    }

  for (i = 0; i < fractionDigits; i++)
    {
      if ((integerDigits > integerThreshold) || (i > fractionThreshold))
    {
      /* Beyond accuracy */
      trailingZeroes++;
    }
      else
    {
      fractionNumber *= dblBase;
      fractionAdjust *= dblBase;
      workNumber = floorl(fractionNumber + fractionAdjust);
      fractionNumber -= workNumber;
      index = (int)fmodl(workNumber, dblBase);
      if (index == 0)
        {
          trailingZeroes++;
        }
      else
        {
          while (trailingZeroes > 0)
        {
          /* Not trailing zeroes after all */
          self->OutStream(self, digits[0]);
          trailingZeroes--;
        }
          self->OutStream(self, digits[index]);
        }
    }
    }
  
  if (keepTrailingZeroes)
    {
      while (trailingZeroes > 0)
    {
      self->OutStream(self, digits[0]);
      trailingZeroes--;
    }
    }
  
  /* Output exponent */
  if (exponentDigits > 0)
    {
      self->OutStream(self,
              isHex
              ? ((flags & FLAGS_UPPER) ? 'P' : 'p')
              : ((flags & FLAGS_UPPER) ? 'E' : 'e'));
      self->OutStream(self, (isExponentNegative) ? '-' : '+');

      /* The exponent must contain at least two digits */
      if (requireTwoDigitExponent)
        self->OutStream(self, '0');

      if (isHex)
    base = 10.0;
      exponentBase = (int)TrioPower(base, exponentDigits - 1);
      for (i = 0; i < exponentDigits; i++)
    {
      self->OutStream(self, digits[(uExponent / exponentBase) % base]);
      exponentBase /= base;
    }
    }
  /* Output trailing spaces */
  if (flags & FLAGS_LEFTADJUST)
    {
      for (i = expectedWidth; i < width; i++)
    {
      self->OutStream(self, CHAR_ADJUST);
    }
    }
}

/*************************************************************************
 * TrioFormatProcess
 *
 * Description:
 *  This is the main engine for formatting output
 */
TRIO_PRIVATE int
TrioFormatProcess
TRIO_ARGS3((data, format, parameters),
       trio_class_t *data,
       TRIO_CONST char *format,
       trio_parameter_t *parameters)
{
#if defined(TRIO_COMPILER_SUPPORTS_MULTIBYTE)
  int charlen;
#endif
  int i;
  TRIO_CONST char *string;
  trio_pointer_t pointer;
  trio_flags_t flags;
  int width;
  int precision;
  int base;
  int index;
  
  index = 0;
  i = 0;
#if defined(TRIO_COMPILER_SUPPORTS_MULTIBYTE)
  (void)mblen(NULL, 0);
#endif
  
  while (format[index])
    {
#if defined(TRIO_COMPILER_SUPPORTS_MULTIBYTE)
      if (! isascii(format[index]))
    {
      charlen = mblen(&format[index], MB_LEN_MAX);
      /*
       * Only valid multibyte characters are handled here. Invalid
       * multibyte characters (charlen == -1) are handled as normal
       * characters.
       */
      if (charlen != -1)
        {
          while (charlen-- > 0)
        {
          data->OutStream(data, format[index++]);
        }
          continue; /* while characters left in formatting string */
        }
    }
#endif /* TRIO_COMPILER_SUPPORTS_MULTIBYTE */
      if (CHAR_IDENTIFIER == format[index])
    {
      if (CHAR_IDENTIFIER == format[index + 1])
        {
          data->OutStream(data, CHAR_IDENTIFIER);
          index += 2;
        }
      else
        {
          /* Skip the parameter entries */
          while (parameters[i].type == FORMAT_PARAMETER)
        i++;
          
          flags = parameters[i].flags;

          /* Find width */
          width = parameters[i].width;
          if (flags & FLAGS_WIDTH_PARAMETER)
        {
          /* Get width from parameter list */
          width = (int)parameters[width].data.number.as_signed;
          if (width < 0)
            {
              /*
               * A negative width is the same as the - flag and
               * a positive width.
               */
              flags |= FLAGS_LEFTADJUST;
              flags &= ~FLAGS_NILPADDING;
              width = -width;
            }
        }
          
          /* Find precision */
          if (flags & FLAGS_PRECISION)
        {
          precision = parameters[i].precision;
          if (flags & FLAGS_PRECISION_PARAMETER)
            {
              /* Get precision from parameter list */
              precision = (int)parameters[precision].data.number.as_signed;
              if (precision < 0)
            {
              /*
               * A negative precision is the same as no
               * precision
               */
              precision = NO_PRECISION;
            }
            }
        }
          else
        {
          precision = NO_PRECISION;
        }

          /* Find base */
          base = parameters[i].base;
          if (flags & FLAGS_BASE_PARAMETER)
        {
          /* Get base from parameter list */
          base = (int)parameters[base].data.number.as_signed;
        }
          
          switch (parameters[i].type)
        {
        case FORMAT_CHAR:
          if (flags & FLAGS_QUOTE)
            data->OutStream(data, CHAR_QUOTE);
          if (! (flags & FLAGS_LEFTADJUST))
            {
              while (--width > 0)
            data->OutStream(data, CHAR_ADJUST);
            }
#if TRIO_WIDECHAR
          if (flags & FLAGS_WIDECHAR)
            {
              TrioWriteWideStringCharacter(data,
                           (trio_wchar_t)parameters[i].data.number.as_signed,
                           flags,
                           NO_WIDTH);
            }
          else
#endif
            {
              TrioWriteStringCharacter(data,
                           (int)parameters[i].data.number.as_signed,
                           flags);
            }

          if (flags & FLAGS_LEFTADJUST)
            {
              while(--width > 0)
            data->OutStream(data, CHAR_ADJUST);
            }
          if (flags & FLAGS_QUOTE)
            data->OutStream(data, CHAR_QUOTE);

          break; /* FORMAT_CHAR */

        case FORMAT_INT:
          TrioWriteNumber(data,
                  parameters[i].data.number.as_unsigned,
                  flags,
                  width,
                  precision,
                  base);

          break; /* FORMAT_INT */

        case FORMAT_DOUBLE:
          TrioWriteDouble(data,
                  parameters[i].data.longdoubleNumber,
                  flags,
                  width,
                  precision,
                  base);
          break; /* FORMAT_DOUBLE */

        case FORMAT_STRING:
#if TRIO_WIDECHAR
          if (flags & FLAGS_WIDECHAR)
            {
              TrioWriteWideString(data,
                      parameters[i].data.wstring,
                      flags,
                      width,
                      precision);
            }
          else
#endif
            {
              TrioWriteString(data,
                      parameters[i].data.string,
                      flags,
                      width,
                      precision);
            }
          break; /* FORMAT_STRING */

        case FORMAT_POINTER:
          {
            trio_reference_t reference;
            
            reference.data = data;
            reference.parameter = &parameters[i];
            trio_print_pointer(&reference, parameters[i].data.pointer);
          }
          break; /* FORMAT_POINTER */

        case FORMAT_COUNT:
          pointer = parameters[i].data.pointer;
          if (NULL != pointer)
            {
              /*
               * C99 paragraph 7.19.6.1.8 says "the number of
               * characters written to the output stream so far by
               * this call", which is data->committed
               */
#if defined(QUALIFIER_SIZE_T) || defined(QUALIFIER_SIZE_T_UPPER)
              if (flags & FLAGS_SIZE_T)
            *(size_t *)pointer = (size_t)data->committed;
              else
#endif
#if defined(QUALIFIER_PTRDIFF_T)
              if (flags & FLAGS_PTRDIFF_T)
            *(ptrdiff_t *)pointer = (ptrdiff_t)data->committed;
              else
#endif
#if defined(QUALIFIER_INTMAX_T)
              if (flags & FLAGS_INTMAX_T)
            *(trio_intmax_t *)pointer = (trio_intmax_t)data->committed;
              else
#endif
              if (flags & FLAGS_QUAD)
            {
              *(trio_ulonglong_t *)pointer = (trio_ulonglong_t)data->committed;
            }
              else if (flags & FLAGS_LONG)
            {
              *(long int *)pointer = (long int)data->committed;
            }
              else if (flags & FLAGS_SHORT)
            {
              *(short int *)pointer = (short int)data->committed;
            }
              else
            {
              *(int *)pointer = (int)data->committed;
            }
            }
          break; /* FORMAT_COUNT */

        case FORMAT_PARAMETER:
          break; /* FORMAT_PARAMETER */

#if defined(FORMAT_ERRNO)
        case FORMAT_ERRNO:
          string = trio_error(parameters[i].data.errorNumber);
          if (string)
            {
              TrioWriteString(data,
                      string,
                      flags,
                      width,
                      precision);
            }
          else
            {
              data->OutStream(data, '#');
              TrioWriteNumber(data,
                      (trio_uintmax_t)parameters[i].data.errorNumber,
                      flags,
                      width,
                      precision,
                      BASE_DECIMAL);
            }
          break; /* FORMAT_ERRNO */
#endif /* defined(FORMAT_ERRNO) */

#if defined(FORMAT_USER_DEFINED)
        case FORMAT_USER_DEFINED:
          {
            trio_reference_t reference;
            trio_userdef_t *def = NULL;

            if (parameters[i].user_name[0] == NIL)
              {
            /* Use handle */
            if ((i > 0) ||
                (parameters[i - 1].type == FORMAT_PARAMETER))
              def = (trio_userdef_t *)parameters[i - 1].data.pointer;
              }
            else
              {
            /* Look up namespace */
            def = TrioFindNamespace(parameters[i].user_name, NULL);
              }
            if (def) {
              reference.data = data;
              reference.parameter = &parameters[i];
              def->callback(&reference);
            }
          }
          break;
#endif /* defined(FORMAT_USER_DEFINED) */
          
        default:
          break;
        } /* switch parameter type */

          /* Prepare for next */
          index = parameters[i].indexAfterSpecifier;
          i++;
        }
    }
      else /* not identifier */
    {
      data->OutStream(data, format[index++]);
    }
    }
  return data->processed;
}

/*************************************************************************
 * TrioFormatRef
 */
TRIO_PRIVATE int
TrioFormatRef
TRIO_ARGS4((reference, format, arglist, argarray),
       trio_reference_t *reference,
       TRIO_CONST char *format,
       va_list *arglist,
       trio_pointer_t *argarray)
{
  int status;
  trio_parameter_t parameters[MAX_PARAMETERS];

  status = TrioParse(TYPE_PRINT, format, parameters, arglist, argarray);
  if (status < 0)
    return status;

  status = TrioFormatProcess(reference->data, format, parameters);
  if (reference->data->error != 0)
    {
      status = reference->data->error;
    }
  return status;
}

/*************************************************************************
 * TrioFormat
 */
TRIO_PRIVATE int
TrioFormat
TRIO_ARGS6((destination, destinationSize, OutStream, format, arglist, argarray),
       trio_pointer_t destination,
       size_t destinationSize,
       void (*OutStream) TRIO_PROTO((trio_class_t *, int)),
       TRIO_CONST char *format,
       va_list *arglist,
       trio_pointer_t *argarray)
{
  int status;
  trio_class_t data;
  trio_parameter_t parameters[MAX_PARAMETERS];

  assert(VALID(OutStream));
  assert(VALID(format));

  memset(&data, 0, sizeof(data));
  data.OutStream = OutStream;
  data.location = destination;
  data.max = destinationSize;
  data.error = 0;

#if defined(USE_LOCALE)
  if (NULL == internalLocaleValues)
    {
      TrioSetLocale();
    }
#endif

  status = TrioParse(TYPE_PRINT, format, parameters, arglist, argarray);
  if (status < 0)
    return status;

  status = TrioFormatProcess(&data, format, parameters);
  if (data.error != 0)
    {
      status = data.error;
    }
  return status;
}

/*************************************************************************
 * TrioOutStreamFile
 */
TRIO_PRIVATE void
TrioOutStreamFile
TRIO_ARGS2((self, output),
       trio_class_t *self,
       int output)
{
  FILE *file;

  assert(VALID(self));
  assert(VALID(self->location));

  file = (FILE *)self->location;
  self->processed++;
  if (fputc(output, file) == EOF)
    {
      self->error = TRIO_ERROR_RETURN(TRIO_EOF, 0);
    }
  else
    {
      self->committed++;
    }
}

/*************************************************************************
 * TrioOutStreamFileDescriptor
 */
TRIO_PRIVATE void
TrioOutStreamFileDescriptor
TRIO_ARGS2((self, output),
       trio_class_t *self,
       int output)
{
  int fd;
  char ch;

  assert(VALID(self));

  fd = *((int *)self->location);
  ch = (char)output;
  self->processed++;
  if (write(fd, &ch, sizeof(char)) == -1)
    {
      self->error = TRIO_ERROR_RETURN(TRIO_ERRNO, 0);
    }
  else
    {
      self->committed++;
    }
}

/*************************************************************************
 * TrioOutStreamCustom
 */
TRIO_PRIVATE void
TrioOutStreamCustom
TRIO_ARGS2((self, output),
       trio_class_t *self,
       int output)
{
  int status;
  trio_custom_t *data;

  assert(VALID(self));
  assert(VALID(self->location));

  data = (trio_custom_t *)self->location;
  if (data->stream.out)
    {
      status = (data->stream.out)(data->closure, output);
      if (status >= 0)
    {
      self->committed++;
    }
      else
    {
      if (self->error == 0)
        {
          self->error = TRIO_ERROR_RETURN(TRIO_ECUSTOM, -status);
        }
    }
    }
  self->processed++;
}

/*************************************************************************
 * TrioOutStreamString
 */
TRIO_PRIVATE void
TrioOutStreamString
TRIO_ARGS2((self, output),
       trio_class_t *self,
       int output)
{
  char **buffer;

  assert(VALID(self));
  assert(VALID(self->location));

  buffer = (char **)self->location;
  **buffer = (char)output;
  (*buffer)++;
  self->processed++;
  self->committed++;
}

/*************************************************************************
 * TrioOutStreamStringMax
 */
TRIO_PRIVATE void
TrioOutStreamStringMax
TRIO_ARGS2((self, output),
       trio_class_t *self,
       int output)
{
  char **buffer;

  assert(VALID(self));
  assert(VALID(self->location));
  
  buffer = (char **)self->location;

  if (self->processed < self->max)
    {
      **buffer = (char)output;
      (*buffer)++;
      self->committed++;
    }
  self->processed++;
}

/*************************************************************************
 * TrioOutStreamStringDynamic
 */
TRIO_PRIVATE void
TrioOutStreamStringDynamic
TRIO_ARGS2((self, output),
       trio_class_t *self,
       int output)
{
  assert(VALID(self));
  assert(VALID(self->location));

  if (self->error == 0)
    {
      trio_xstring_append_char((trio_string_t *)self->location,
                   (char)output);
      self->committed++;
    }
  /* The processed variable must always be increased */
  self->processed++;
}

/*************************************************************************
 *
 * Formatted printing functions
 *
 ************************************************************************/

#if defined(TRIO_DOCUMENTATION)
# include "doc/doc_printf.h"
#endif

/*************************************************************************
 * printf
 */

TRIO_PUBLIC int
trio_printf
TRIO_VARGS2((format, va_alist),
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  int status;
  va_list args;

  assert(VALID(format));
  
  TRIO_VA_START(args, format);
  status = TrioFormat(stdout, 0, TrioOutStreamFile, format, &args, NULL);
  TRIO_VA_END(args);
  return status;
}

TRIO_PUBLIC int
trio_vprintf
TRIO_ARGS2((format, args),
       TRIO_CONST char *format,
       va_list args)
{
  assert(VALID(format));

  return TrioFormat(stdout, 0, TrioOutStreamFile, format, &args, NULL);
}

TRIO_PUBLIC int
trio_printfv
TRIO_ARGS2((format, args),
       TRIO_CONST char *format,
       trio_pointer_t * args)
{
  assert(VALID(format));

  return TrioFormat(stdout, 0, TrioOutStreamFile, format, NULL, args);
}

/*************************************************************************
 * fprintf
 */

TRIO_PUBLIC int
trio_fprintf
TRIO_VARGS3((file, format, va_alist),
        FILE *file,
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  int status;
  va_list args;

  assert(VALID(file));
  assert(VALID(format));
  
  TRIO_VA_START(args, format);
  status = TrioFormat(file, 0, TrioOutStreamFile, format, &args, NULL);
  TRIO_VA_END(args);
  return status;
}

TRIO_PUBLIC int
trio_vfprintf
TRIO_ARGS3((file, format, args),
       FILE *file,
       TRIO_CONST char *format,
       va_list args)
{
  assert(VALID(file));
  assert(VALID(format));
  
  return TrioFormat(file, 0, TrioOutStreamFile, format, &args, NULL);
}

TRIO_PUBLIC int
trio_fprintfv
TRIO_ARGS3((file, format, args),
       FILE *file,
       TRIO_CONST char *format,
       trio_pointer_t * args)
{
  assert(VALID(file));
  assert(VALID(format));
  
  return TrioFormat(file, 0, TrioOutStreamFile, format, NULL, args);
}

/*************************************************************************
 * dprintf
 */

TRIO_PUBLIC int
trio_dprintf
TRIO_VARGS3((fd, format, va_alist),
        int fd,
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  int status;
  va_list args;

  assert(VALID(format));
  
  TRIO_VA_START(args, format);
  status = TrioFormat(&fd, 0, TrioOutStreamFileDescriptor, format, &args, NULL);
  TRIO_VA_END(args);
  return status;
}

TRIO_PUBLIC int
trio_vdprintf
TRIO_ARGS3((fd, format, args),
       int fd,
       TRIO_CONST char *format,
       va_list args)
{
  assert(VALID(format));
  
  return TrioFormat(&fd, 0, TrioOutStreamFileDescriptor, format, &args, NULL);
}

TRIO_PUBLIC int
trio_dprintfv
TRIO_ARGS3((fd, format, args),
       int fd,
       TRIO_CONST char *format,
       trio_pointer_t *args)
{
  assert(VALID(format));
  
  return TrioFormat(&fd, 0, TrioOutStreamFileDescriptor, format, NULL, args);
}

/*************************************************************************
 * cprintf
 */
TRIO_PUBLIC int
trio_cprintf
TRIO_VARGS4((stream, closure, format, va_alist),
        trio_outstream_t stream,
        trio_pointer_t closure,
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  int status;
  va_list args;
  trio_custom_t data;

  assert(VALID(stream));
  assert(VALID(format));

  TRIO_VA_START(args, format);
  data.stream.out = stream;
  data.closure = closure;
  status = TrioFormat(&data, 0, TrioOutStreamCustom, format, &args, NULL);
  TRIO_VA_END(args);
  return status;
}

TRIO_PUBLIC int
trio_vcprintf
TRIO_ARGS4((stream, closure, format, args),
       trio_outstream_t stream,
       trio_pointer_t closure,
       TRIO_CONST char *format,
       va_list args)
{
  trio_custom_t data;

  assert(VALID(stream));
  assert(VALID(format));

  data.stream.out = stream;
  data.closure = closure;
  return TrioFormat(&data, 0, TrioOutStreamCustom, format, &args, NULL);
}

TRIO_PUBLIC int
trio_cprintfv
TRIO_ARGS4((stream, closure, format, args),
       trio_outstream_t stream,
       trio_pointer_t closure,
       TRIO_CONST char *format,
       void **args)
{
  trio_custom_t data;

  assert(VALID(stream));
  assert(VALID(format));

  data.stream.out = stream;
  data.closure = closure;
  return TrioFormat(&data, 0, TrioOutStreamCustom, format, NULL, args);
}

/*************************************************************************
 * sprintf
 */

TRIO_PUBLIC int
trio_sprintf
TRIO_VARGS3((buffer, format, va_alist),
        char *buffer,
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  int status;
  va_list args;

  assert(VALID(buffer));
  assert(VALID(format));
  
  TRIO_VA_START(args, format);
  status = TrioFormat(&buffer, 0, TrioOutStreamString, format, &args, NULL);
  *buffer = NIL; /* Terminate with NIL character */
  TRIO_VA_END(args);
  return status;
}

TRIO_PUBLIC int
trio_vsprintf
TRIO_ARGS3((buffer, format, args),
       char *buffer,
       TRIO_CONST char *format,
       va_list args)
{
  int status;

  assert(VALID(buffer));
  assert(VALID(format));

  status = TrioFormat(&buffer, 0, TrioOutStreamString, format, &args, NULL);
  *buffer = NIL;
  return status;
}

TRIO_PUBLIC int
trio_sprintfv
TRIO_ARGS3((buffer, format, args),
       char *buffer,
       TRIO_CONST char *format,
       trio_pointer_t *args)
{
  int status;

  assert(VALID(buffer));
  assert(VALID(format));

  status = TrioFormat(&buffer, 0, TrioOutStreamString, format, NULL, args);
  *buffer = NIL;
  return status;
}

/*************************************************************************
 * snprintf
 */

TRIO_PUBLIC int
trio_snprintf
TRIO_VARGS4((buffer, max, format, va_alist),
        char *buffer,
        size_t max,
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  int status;
  va_list args;

  assert(VALID(buffer));
  assert(VALID(format));

  TRIO_VA_START(args, format);
  status = TrioFormat(&buffer, max > 0 ? max - 1 : 0,
              TrioOutStreamStringMax, format, &args, NULL);
  if (max > 0)
    *buffer = NIL;
  TRIO_VA_END(args);
  return status;
}

TRIO_PUBLIC int
trio_vsnprintf
TRIO_ARGS4((buffer, max, format, args),
       char *buffer,
       size_t max,
       TRIO_CONST char *format,
       va_list args)
{
  int status;

  assert(VALID(buffer));
  assert(VALID(format));

  status = TrioFormat(&buffer, max > 0 ? max - 1 : 0,
              TrioOutStreamStringMax, format, &args, NULL);
  if (max > 0)
    *buffer = NIL;
  return status;
}

TRIO_PUBLIC int
trio_snprintfv
TRIO_ARGS4((buffer, max, format, args),
       char *buffer,
       size_t max,
       TRIO_CONST char *format,
       trio_pointer_t *args)
{
  int status;

  assert(VALID(buffer));
  assert(VALID(format));

  status = TrioFormat(&buffer, max > 0 ? max - 1 : 0,
              TrioOutStreamStringMax, format, NULL, args);
  if (max > 0)
    *buffer = NIL;
  return status;
}

/*************************************************************************
 * snprintfcat
 * Appends the new string to the buffer string overwriting the '\0'
 * character at the end of buffer.
 */
TRIO_PUBLIC int
trio_snprintfcat
TRIO_VARGS4((buffer, max, format, va_alist),
        char *buffer,
        size_t max,
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  int status;
  va_list args;
  size_t buf_len;

  TRIO_VA_START(args, format);

  assert(VALID(buffer));
  assert(VALID(format));

  buf_len = trio_length(buffer);
  buffer = &buffer[buf_len];

  status = TrioFormat(&buffer, max - 1 - buf_len,
              TrioOutStreamStringMax, format, &args, NULL);
  TRIO_VA_END(args);
  *buffer = NIL;
  return status;
}

TRIO_PUBLIC int
trio_vsnprintfcat
TRIO_ARGS4((buffer, max, format, args),
       char *buffer,
       size_t max,
       TRIO_CONST char *format,
       va_list args)
{
  int status;
  size_t buf_len;
  
  assert(VALID(buffer));
  assert(VALID(format));

  buf_len = trio_length(buffer);
  buffer = &buffer[buf_len];
  status = TrioFormat(&buffer, max - 1 - buf_len,
              TrioOutStreamStringMax, format, &args, NULL);
  *buffer = NIL;
  return status;
}

/*************************************************************************
 * trio_aprintf
 */

/* Deprecated */
TRIO_PUBLIC char *
trio_aprintf
TRIO_VARGS2((format, va_alist),
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  va_list args;
  trio_string_t *info;
  char *result = NULL;

  assert(VALID(format));
  
  info = trio_xstring_duplicate("");
  if (info)
    {
      TRIO_VA_START(args, format);
      (void)TrioFormat(info, 0, TrioOutStreamStringDynamic,
               format, &args, NULL);
      TRIO_VA_END(args);

      trio_string_terminate(info);
      result = trio_string_extract(info);
      trio_string_destroy(info);
    }
  return result;
}

/* Deprecated */
TRIO_PUBLIC char *
trio_vaprintf
TRIO_ARGS2((format, args),
       TRIO_CONST char *format,
       va_list args)
{
  trio_string_t *info;
  char *result = NULL;
  
  assert(VALID(format));
  
  info = trio_xstring_duplicate("");
  if (info)
    {
      (void)TrioFormat(info, 0, TrioOutStreamStringDynamic,
               format, &args, NULL);
      trio_string_terminate(info);
      result = trio_string_extract(info);
      trio_string_destroy(info);
    }
  return result;
}

TRIO_PUBLIC int
trio_asprintf
TRIO_VARGS3((result, format, va_alist),
        char **result,
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  va_list args;
  int status;
  trio_string_t *info;

  assert(VALID(format));

  *result = NULL;
  
  info = trio_xstring_duplicate("");
  if (info == NULL)
    {
      status = TRIO_ERROR_RETURN(TRIO_ENOMEM, 0);
    }
  else
    {
      TRIO_VA_START(args, format);
      status = TrioFormat(info, 0, TrioOutStreamStringDynamic,
              format, &args, NULL);
      TRIO_VA_END(args);
      if (status >= 0)
    {
      trio_string_terminate(info);
      *result = trio_string_extract(info);
    }
      trio_string_destroy(info);
    }
  return status;
}

TRIO_PUBLIC int
trio_vasprintf
TRIO_ARGS3((result, format, args),
       char **result,
       TRIO_CONST char *format,
       va_list args)
{
  int status;
  trio_string_t *info;
  
  assert(VALID(format));

  *result = NULL;
  
  info = trio_xstring_duplicate("");
  if (info == NULL)
    {
      status = TRIO_ERROR_RETURN(TRIO_ENOMEM, 0);
    }
  else
    {
      status = TrioFormat(info, 0, TrioOutStreamStringDynamic,
              format, &args, NULL);
      if (status >= 0)
    {
      trio_string_terminate(info);
      *result = trio_string_extract(info);
    }
      trio_string_destroy(info);
    }
  return status;
}

/*************************************************************************
 *
 * CALLBACK
 *
 ************************************************************************/

#if defined(TRIO_DOCUMENTATION)
# include "doc/doc_register.h"
#endif

#if TRIO_EXTENSION

/*************************************************************************
 * trio_register
 */

TRIO_PUBLIC trio_pointer_t 
trio_register
TRIO_ARGS2((callback, name),
       trio_callback_t callback,
       TRIO_CONST char *name)
{
  trio_userdef_t *def;
  trio_userdef_t *prev = NULL;

  if (callback == NULL)
    return NULL;

  if (name)
    {
      /* Handle built-in namespaces */
      if (name[0] == ':')
    {
      if (trio_equal(name, ":enter"))
        {
          internalEnterCriticalRegion = callback;
        }
      else if (trio_equal(name, ":leave"))
        {
          internalLeaveCriticalRegion = callback;
        }
      return NULL;
    }
      
      /* Bail out if namespace is too long */
      if (trio_length(name) >= MAX_USER_NAME)
    return NULL;
      
      /* Bail out if namespace already is registered */
      def = TrioFindNamespace(name, &prev);
      if (def)
    return NULL;
    }
  
  def = (trio_userdef_t *)TRIO_MALLOC(sizeof(trio_userdef_t));
  if (def)
    {
      if (internalEnterCriticalRegion)
    (void)internalEnterCriticalRegion(NULL);
      
      if (name)
    {
      /* Link into internal list */
      if (prev == NULL)
        internalUserDef = def;
      else
        prev->next = def;
    }
      /* Initialize */
      def->callback = callback;
      def->name = (name == NULL)
    ? NULL
    : trio_duplicate(name);
      def->next = NULL;

      if (internalLeaveCriticalRegion)
    (void)internalLeaveCriticalRegion(NULL);
    }
  return (trio_pointer_t)def;
}

void
trio_unregister
TRIO_ARGS1((handle),
       trio_pointer_t handle)
{
  trio_userdef_t *self = (trio_userdef_t *)handle;
  trio_userdef_t *def;
  trio_userdef_t *prev = NULL;

  assert(VALID(self));

  if (self->name)
    {
      def = TrioFindNamespace(self->name, &prev);
      if (def)
    {
      if (internalEnterCriticalRegion)
        (void)internalEnterCriticalRegion(NULL);
      
      if (prev == NULL)
        internalUserDef = NULL;
      else
        prev->next = def->next;
      
      if (internalLeaveCriticalRegion)
        (void)internalLeaveCriticalRegion(NULL);
    }
      trio_destroy(self->name);
    }
  TRIO_FREE(self);
}

/*************************************************************************
 * trio_get_format [public]
 */
TRIO_CONST char *
trio_get_format
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
#if defined(FORMAT_USER_DEFINED)
  assert(((trio_reference_t *)ref)->parameter->type == FORMAT_USER_DEFINED);
#endif
  
  return (((trio_reference_t *)ref)->parameter->user_data);
}

/*************************************************************************
 * trio_get_argument [public]
 */
trio_pointer_t 
trio_get_argument
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
#if defined(FORMAT_USER_DEFINED)
  assert(((trio_reference_t *)ref)->parameter->type == FORMAT_USER_DEFINED);
#endif
  
  return ((trio_reference_t *)ref)->parameter->data.pointer;
}

/*************************************************************************
 * trio_get_width / trio_set_width [public]
 */
int
trio_get_width
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return ((trio_reference_t *)ref)->parameter->width;
}

void
trio_set_width
TRIO_ARGS2((ref, width),
       trio_pointer_t ref,
       int width)
{
  ((trio_reference_t *)ref)->parameter->width = width;
}

/*************************************************************************
 * trio_get_precision / trio_set_precision [public]
 */
int
trio_get_precision
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->precision);
}

void
trio_set_precision
TRIO_ARGS2((ref, precision),
       trio_pointer_t ref,
       int precision)
{
  ((trio_reference_t *)ref)->parameter->precision = precision;
}

/*************************************************************************
 * trio_get_base / trio_set_base [public]
 */
int
trio_get_base
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->base);
}

void
trio_set_base
TRIO_ARGS2((ref, base),
       trio_pointer_t ref,
       int base)
{
  ((trio_reference_t *)ref)->parameter->base = base;
}

/*************************************************************************
 * trio_get_long / trio_set_long [public]
 */
int
trio_get_long
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_LONG)
    ? TRUE
    : FALSE;
}

void
trio_set_long
TRIO_ARGS2((ref, is_long),
       trio_pointer_t ref,
       int is_long)
{
  if (is_long)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_LONG;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_LONG;
}

/*************************************************************************
 * trio_get_longlong / trio_set_longlong [public]
 */
int
trio_get_longlong
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_QUAD)
    ? TRUE
    : FALSE;
}

void
trio_set_longlong
TRIO_ARGS2((ref, is_longlong),
       trio_pointer_t ref,
       int is_longlong)
{
  if (is_longlong)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_QUAD;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_QUAD;
}

/*************************************************************************
 * trio_get_longdouble / trio_set_longdouble [public]
 */
int
trio_get_longdouble
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_LONGDOUBLE)
    ? TRUE
    : FALSE;
}

void
trio_set_longdouble
TRIO_ARGS2((ref, is_longdouble),
       trio_pointer_t ref,
       int is_longdouble)
{
  if (is_longdouble)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_LONGDOUBLE;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_LONGDOUBLE;
}

/*************************************************************************
 * trio_get_short / trio_set_short [public]
 */
int
trio_get_short
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_SHORT)
    ? TRUE
    : FALSE;
}

void
trio_set_short
TRIO_ARGS2((ref, is_short),
       trio_pointer_t ref,
       int is_short)
{
  if (is_short)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_SHORT;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_SHORT;
}

/*************************************************************************
 * trio_get_shortshort / trio_set_shortshort [public]
 */
int
trio_get_shortshort
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_SHORTSHORT)
    ? TRUE
    : FALSE;
}

void
trio_set_shortshort
TRIO_ARGS2((ref, is_shortshort),
       trio_pointer_t ref,
       int is_shortshort)
{
  if (is_shortshort)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_SHORTSHORT;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_SHORTSHORT;
}

/*************************************************************************
 * trio_get_alternative / trio_set_alternative [public]
 */
int
trio_get_alternative
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_ALTERNATIVE)
    ? TRUE
    : FALSE;
}

void
trio_set_alternative
TRIO_ARGS2((ref, is_alternative),
       trio_pointer_t ref,
       int is_alternative)
{
  if (is_alternative)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_ALTERNATIVE;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_ALTERNATIVE;
}

/*************************************************************************
 * trio_get_alignment / trio_set_alignment [public]
 */
int
trio_get_alignment
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_LEFTADJUST)
    ? TRUE
    : FALSE;
}

void
trio_set_alignment
TRIO_ARGS2((ref, is_leftaligned),
       trio_pointer_t ref,
       int is_leftaligned)
{
  if (is_leftaligned)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_LEFTADJUST;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_LEFTADJUST;
}

/*************************************************************************
 * trio_get_spacing /trio_set_spacing [public]
 */
int
trio_get_spacing
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_SPACE)
    ? TRUE
    : FALSE;
}

void
trio_set_spacing
TRIO_ARGS2((ref, is_space),
       trio_pointer_t ref,
       int is_space)
{
  if (is_space)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_SPACE;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_SPACE;
}

/*************************************************************************
 * trio_get_sign / trio_set_sign [public]
 */
int
trio_get_sign
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_SHOWSIGN)
    ? TRUE
    : FALSE;
}

void
trio_set_sign
TRIO_ARGS2((ref, is_sign),
       trio_pointer_t ref,
       int is_sign)
{
  if (is_sign)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_SHOWSIGN;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_SHOWSIGN;
}

/*************************************************************************
 * trio_get_padding / trio_set_padding [public]
 */
int
trio_get_padding
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_NILPADDING)
    ? TRUE
    : FALSE;
}

void
trio_set_padding
TRIO_ARGS2((ref, is_padding),
       trio_pointer_t ref,
       int is_padding)
{
  if (is_padding)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_NILPADDING;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_NILPADDING;
}

/*************************************************************************
 * trio_get_quote / trio_set_quote [public]
 */
int
trio_get_quote
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_QUOTE)
    ? TRUE
    : FALSE;
}

void
trio_set_quote
TRIO_ARGS2((ref, is_quote),
       trio_pointer_t ref,
       int is_quote)
{
  if (is_quote)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_QUOTE;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_QUOTE;
}

/*************************************************************************
 * trio_get_upper / trio_set_upper [public]
 */
int
trio_get_upper
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_UPPER)
    ? TRUE
    : FALSE;
}

void
trio_set_upper
TRIO_ARGS2((ref, is_upper),
       trio_pointer_t ref,
       int is_upper)
{
  if (is_upper)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_UPPER;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_UPPER;
}

/*************************************************************************
 * trio_get_largest / trio_set_largest [public]
 */
#if TRIO_C99
int
trio_get_largest
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_INTMAX_T)
    ? TRUE
    : FALSE;
}

void
trio_set_largest
TRIO_ARGS2((ref, is_largest),
       trio_pointer_t ref,
       int is_largest)
{
  if (is_largest)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_INTMAX_T;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_INTMAX_T;
}
#endif

/*************************************************************************
 * trio_get_ptrdiff / trio_set_ptrdiff [public]
 */
int
trio_get_ptrdiff
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_PTRDIFF_T)
    ? TRUE
    : FALSE;
}

void
trio_set_ptrdiff
TRIO_ARGS2((ref, is_ptrdiff),
       trio_pointer_t ref,
       int is_ptrdiff)
{
  if (is_ptrdiff)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_PTRDIFF_T;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_PTRDIFF_T;
}

/*************************************************************************
 * trio_get_size / trio_set_size [public]
 */
#if TRIO_C99
int
trio_get_size
TRIO_ARGS1((ref),
       trio_pointer_t ref)
{
  return (((trio_reference_t *)ref)->parameter->flags & FLAGS_SIZE_T)
    ? TRUE
    : FALSE;
}

void
trio_set_size
TRIO_ARGS2((ref, is_size),
       trio_pointer_t ref,
       int is_size)
{
  if (is_size)
    ((trio_reference_t *)ref)->parameter->flags |= FLAGS_SIZE_T;
  else
    ((trio_reference_t *)ref)->parameter->flags &= ~FLAGS_SIZE_T;
}
#endif

/*************************************************************************
 * trio_print_int [public]
 */
void
trio_print_int
TRIO_ARGS2((ref, number),
       trio_pointer_t ref,
       int number)
{
  trio_reference_t *self = (trio_reference_t *)ref;

  TrioWriteNumber(self->data,
          (trio_uintmax_t)number,
          self->parameter->flags,
          self->parameter->width,
          self->parameter->precision,
          self->parameter->base);
}

/*************************************************************************
 * trio_print_uint [public]
 */
void
trio_print_uint
TRIO_ARGS2((ref, number),
       trio_pointer_t ref,
       unsigned int number)
{
  trio_reference_t *self = (trio_reference_t *)ref;

  TrioWriteNumber(self->data,
          (trio_uintmax_t)number,
          self->parameter->flags | FLAGS_UNSIGNED,
          self->parameter->width,
          self->parameter->precision,
          self->parameter->base);
}

/*************************************************************************
 * trio_print_double [public]
 */
void
trio_print_double
TRIO_ARGS2((ref, number),
       trio_pointer_t ref,
       double number)
{
  trio_reference_t *self = (trio_reference_t *)ref;

  TrioWriteDouble(self->data,
          number,
          self->parameter->flags,
          self->parameter->width,
          self->parameter->precision,
          self->parameter->base);
}

/*************************************************************************
 * trio_print_string [public]
 */
void
trio_print_string
TRIO_ARGS2((ref, string),
       trio_pointer_t ref,
       char *string)
{
  trio_reference_t *self = (trio_reference_t *)ref;

  TrioWriteString(self->data,
          string,
          self->parameter->flags,
          self->parameter->width,
          self->parameter->precision);
}

/*************************************************************************
 * trio_print_ref [public]
 */
int
trio_print_ref
TRIO_VARGS3((ref, format, va_alist),
        trio_pointer_t ref,
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  int status;
  va_list arglist;

  assert(VALID(format));
  
  TRIO_VA_START(arglist, format);
  status = TrioFormatRef((trio_reference_t *)ref, format, &arglist, NULL);
  TRIO_VA_END(arglist);
  return status;
}

/*************************************************************************
 * trio_vprint_ref [public]
 */
int
trio_vprint_ref
TRIO_ARGS3((ref, format, arglist),
       trio_pointer_t ref,
       TRIO_CONST char *format,
       va_list arglist)
{
  assert(VALID(format));
  
  return TrioFormatRef((trio_reference_t *)ref, format, &arglist, NULL);
}

/*************************************************************************
 * trio_printv_ref [public]
 */
int
trio_printv_ref
TRIO_ARGS3((ref, format, argarray),
       trio_pointer_t ref,
       TRIO_CONST char *format,
       trio_pointer_t *argarray)
{
  assert(VALID(format));
  
  return TrioFormatRef((trio_reference_t *)ref, format, NULL, argarray);
}

#endif /* TRIO_EXTENSION */

/*************************************************************************
 * trio_print_pointer [public]
 */
void
trio_print_pointer
TRIO_ARGS2((ref, pointer),
       trio_pointer_t ref,
       trio_pointer_t pointer)
{
  trio_reference_t *self = (trio_reference_t *)ref;
  trio_flags_t flags;
  trio_uintmax_t number;

  if (NULL == pointer)
    {
      TRIO_CONST char *string = internalNullString;
      while (*string)
    self->data->OutStream(self->data, *string++);
    }
  else
    {
      /*
       * The subtraction of the null pointer is a workaround
       * to avoid a compiler warning. The performance overhead
       * is negligible (and likely to be removed by an
       * optimizing compiler). The (char *) casting is done
       * to please ANSI C++.
       */
      number = (trio_uintmax_t)((char *)pointer - (char *)0);
      /* Shrink to size of pointer */
      number &= (trio_uintmax_t)-1;
      flags = self->parameter->flags;
      flags |= (FLAGS_UNSIGNED | FLAGS_ALTERNATIVE |
            FLAGS_NILPADDING);
      TrioWriteNumber(self->data,
              number,
              flags,
              POINTER_WIDTH,
              NO_PRECISION,
              BASE_HEX);
    }
}

/*************************************************************************
 *
 * LOCALES
 *
 ************************************************************************/

/*************************************************************************
 * trio_locale_set_decimal_point
 *
 * Decimal point can only be one character. The input argument is a
 * string to enable multibyte characters. At most MB_LEN_MAX characters
 * will be used.
 */
TRIO_PUBLIC void
trio_locale_set_decimal_point
TRIO_ARGS1((decimalPoint),
       char *decimalPoint)
{
#if defined(USE_LOCALE)
  if (NULL == internalLocaleValues)
    {
      TrioSetLocale();
    }
#endif
  internalDecimalPointLength = trio_length(decimalPoint);
  if (internalDecimalPointLength == 1)
    {
      internalDecimalPoint = *decimalPoint;
    }
  else
    {
      internalDecimalPoint = NIL;
      trio_copy_max(internalDecimalPointString,
            sizeof(internalDecimalPointString),
            decimalPoint);
    }
}

/*************************************************************************
 * trio_locale_set_thousand_separator
 *
 * See trio_locale_set_decimal_point
 */
TRIO_PUBLIC void
trio_locale_set_thousand_separator
TRIO_ARGS1((thousandSeparator),
       char *thousandSeparator)
{
#if defined(USE_LOCALE)
  if (NULL == internalLocaleValues)
    {
      TrioSetLocale();
    }
#endif
  trio_copy_max(internalThousandSeparator,
        sizeof(internalThousandSeparator),
        thousandSeparator);
  internalThousandSeparatorLength = trio_length(internalThousandSeparator);
}

/*************************************************************************
 * trio_locale_set_grouping
 *
 * Array of bytes. Reversed order.
 *
 *  CHAR_MAX : No further grouping
 *  0        : Repeat last group for the remaining digits (not necessary
 *             as C strings are zero-terminated)
 *  n        : Set current group to n
 *
 * Same order as the grouping attribute in LC_NUMERIC.
 */
TRIO_PUBLIC void
trio_locale_set_grouping
TRIO_ARGS1((grouping),
       char *grouping)
{
#if defined(USE_LOCALE)
  if (NULL == internalLocaleValues)
    {
      TrioSetLocale();
    }
#endif
  trio_copy_max(internalGrouping,
        sizeof(internalGrouping),
        grouping);
}


/*************************************************************************
 *
 * SCANNING
 *
 ************************************************************************/

/*************************************************************************
 * TrioSkipWhitespaces
 */
TRIO_PRIVATE int
TrioSkipWhitespaces
TRIO_ARGS1((self),
       trio_class_t *self)
{
  int ch;

  ch = self->current;
  while (isspace(ch))
    {
      self->InStream(self, &ch);
    }
  return ch;
}

/*************************************************************************
 * TrioGetCollation
 */
#if TRIO_EXTENSION
TRIO_PRIVATE void
TrioGetCollation(TRIO_NOARGS)
{
  int i;
  int j;
  int k;
  char first[2];
  char second[2];

  /* This is computationally expensive */
  first[1] = NIL;
  second[1] = NIL;
  for (i = 0; i < MAX_CHARACTER_CLASS; i++)
    {
      k = 0;
      first[0] = (char)i;
      for (j = 0; j < MAX_CHARACTER_CLASS; j++)
    {
      second[0] = (char)j;
      if (trio_equal_locale(first, second))
        internalCollationArray[i][k++] = (char)j;
    }
      internalCollationArray[i][k] = NIL;
    }
}
#endif

/*************************************************************************
 * TrioGetCharacterClass
 *
 * FIXME:
 *  multibyte
 */
TRIO_PRIVATE int
TrioGetCharacterClass
TRIO_ARGS4((format, indexPointer, flagsPointer, characterclass),
       TRIO_CONST char *format,
       int *indexPointer,
       trio_flags_t *flagsPointer,
       int *characterclass)
{
  int index = *indexPointer;
  int i;
  char ch;
  char range_begin;
  char range_end;

  *flagsPointer &= ~FLAGS_EXCLUDE;

  if (format[index] == QUALIFIER_CIRCUMFLEX)
    {
      *flagsPointer |= FLAGS_EXCLUDE;
      index++;
    }
  /*
   * If the ungroup character is at the beginning of the scanlist,
   * it will be part of the class, and a second ungroup character
   * must follow to end the group.
   */
  if (format[index] == SPECIFIER_UNGROUP)
    {
      characterclass[(int)SPECIFIER_UNGROUP]++;
      index++;
    }
  /*
   * Minus is used to specify ranges. To include minus in the class,
   * it must be at the beginning of the list
   */
  if (format[index] == QUALIFIER_MINUS)
    {
      characterclass[(int)QUALIFIER_MINUS]++;
      index++;
    }
  /* Collect characters */
  for (ch = format[index];
       (ch != SPECIFIER_UNGROUP) && (ch != NIL);
       ch = format[++index])
    {
      switch (ch)
    {
    case QUALIFIER_MINUS: /* Scanlist ranges */
      
      /*
       * Both C99 and UNIX98 describes ranges as implementation-
       * defined.
       *
       * We support the following behaviour (although this may
       * change as we become wiser)
       * - only increasing ranges, ie. [a-b] but not [b-a]
       * - transitive ranges, ie. [a-b-c] == [a-c]
       * - trailing minus, ie. [a-] is interpreted as an 'a'
       *   and a '-'
       * - duplicates (although we can easily convert these
       *   into errors)
       */
      range_begin = format[index - 1];
      range_end = format[++index];
      if (range_end == SPECIFIER_UNGROUP)
        {
          /* Trailing minus is included */
          characterclass[(int)ch]++;
          ch = range_end;
          break; /* for */
        }
      if (range_end == NIL)
        return TRIO_ERROR_RETURN(TRIO_EINVAL, index);
      if (range_begin > range_end)
        return TRIO_ERROR_RETURN(TRIO_ERANGE, index);
        
      for (i = (int)range_begin; i <= (int)range_end; i++)
        characterclass[i]++;
        
      ch = range_end;
      break;
      
#if TRIO_EXTENSION

    case SPECIFIER_GROUP:
      
      switch (format[index + 1])
        {
        case QUALIFIER_DOT: /* Collating symbol */
          /*
           * FIXME: This will be easier to implement when multibyte
           * characters have been implemented. Until now, we ignore
           * this feature.
           */
          for (i = index + 2; ; i++)
        {
          if (format[i] == NIL)
            /* Error in syntax */
            return -1;
          else if (format[i] == QUALIFIER_DOT)
            break; /* for */
        }
          if (format[++i] != SPECIFIER_UNGROUP)
        return -1;
          
          index = i;
          break;
      
        case QUALIFIER_EQUAL: /* Equivalence class expressions */
          {
        unsigned int j;
        unsigned int k;
        
        if (internalCollationUnconverted)
          {
            /* Lazy evaluation of collation array */
            TrioGetCollation();
            internalCollationUnconverted = FALSE;
          }
        for (i = index + 2; ; i++)
          {
            if (format[i] == NIL)
              /* Error in syntax */
              return -1;
            else if (format[i] == QUALIFIER_EQUAL)
              break; /* for */
            else
              {
            /* Mark any equivalent character */
            k = (unsigned int)format[i];
            for (j = 0; internalCollationArray[k][j] != NIL; j++)
              characterclass[(int)internalCollationArray[k][j]]++;
              }
          }
        if (format[++i] != SPECIFIER_UNGROUP)
          return -1;
        
        index = i;
          }
          break;
      
        case QUALIFIER_COLON: /* Character class expressions */
      
          if (trio_equal_max(CLASS_ALNUM, sizeof(CLASS_ALNUM) - 1,
                 &format[index]))
        {
          for (i = 0; i < MAX_CHARACTER_CLASS; i++)
            if (isalnum(i))
              characterclass[i]++;
          index += sizeof(CLASS_ALNUM) - 1;
        }
          else if (trio_equal_max(CLASS_ALPHA, sizeof(CLASS_ALPHA) - 1,
                      &format[index]))
        {
          for (i = 0; i < MAX_CHARACTER_CLASS; i++)
            if (isalpha(i))
              characterclass[i]++;
          index += sizeof(CLASS_ALPHA) - 1;
        }
          else if (trio_equal_max(CLASS_CNTRL, sizeof(CLASS_CNTRL) - 1,
                      &format[index]))
        {
          for (i = 0; i < MAX_CHARACTER_CLASS; i++)
            if (iscntrl(i))
              characterclass[i]++;
          index += sizeof(CLASS_CNTRL) - 1;
        }
          else if (trio_equal_max(CLASS_DIGIT, sizeof(CLASS_DIGIT) - 1,
                      &format[index]))
        {
          for (i = 0; i < MAX_CHARACTER_CLASS; i++)
            if (isdigit(i))
              characterclass[i]++;
          index += sizeof(CLASS_DIGIT) - 1;
        }
          else if (trio_equal_max(CLASS_GRAPH, sizeof(CLASS_GRAPH) - 1,
                      &format[index]))
        {
          for (i = 0; i < MAX_CHARACTER_CLASS; i++)
            if (isgraph(i))
              characterclass[i]++;
          index += sizeof(CLASS_GRAPH) - 1;
        }
          else if (trio_equal_max(CLASS_LOWER, sizeof(CLASS_LOWER) - 1,
                      &format[index]))
        {
          for (i = 0; i < MAX_CHARACTER_CLASS; i++)
            if (islower(i))
              characterclass[i]++;
          index += sizeof(CLASS_LOWER) - 1;
        }
          else if (trio_equal_max(CLASS_PRINT, sizeof(CLASS_PRINT) - 1,
                      &format[index]))
        {
          for (i = 0; i < MAX_CHARACTER_CLASS; i++)
            if (isprint(i))
              characterclass[i]++;
          index += sizeof(CLASS_PRINT) - 1;
        }
          else if (trio_equal_max(CLASS_PUNCT, sizeof(CLASS_PUNCT) - 1,
                      &format[index]))
        {
          for (i = 0; i < MAX_CHARACTER_CLASS; i++)
            if (ispunct(i))
              characterclass[i]++;
          index += sizeof(CLASS_PUNCT) - 1;
        }
          else if (trio_equal_max(CLASS_SPACE, sizeof(CLASS_SPACE) - 1,
                      &format[index]))
        {
          for (i = 0; i < MAX_CHARACTER_CLASS; i++)
            if (isspace(i))
              characterclass[i]++;
          index += sizeof(CLASS_SPACE) - 1;
        }
          else if (trio_equal_max(CLASS_UPPER, sizeof(CLASS_UPPER) - 1,
                      &format[index]))
        {
          for (i = 0; i < MAX_CHARACTER_CLASS; i++)
            if (isupper(i))
              characterclass[i]++;
          index += sizeof(CLASS_UPPER) - 1;
        }
          else if (trio_equal_max(CLASS_XDIGIT, sizeof(CLASS_XDIGIT) - 1,
                      &format[index]))
        {
          for (i = 0; i < MAX_CHARACTER_CLASS; i++)
            if (isxdigit(i))
              characterclass[i]++;
          index += sizeof(CLASS_XDIGIT) - 1;
        }
          else
        {
          characterclass[(int)ch]++;
        }
          break;

        default:
          characterclass[(int)ch]++;
          break;
        }
      break;
      
#endif /* TRIO_EXTENSION */
      
    default:
      characterclass[(int)ch]++;
      break;
    }
    }
  return 0;
}

/*************************************************************************
 * TrioReadNumber
 *
 * We implement our own number conversion in preference of strtol and
 * strtoul, because we must handle 'long long' and thousand separators.
 */
TRIO_PRIVATE BOOLEAN_T
TrioReadNumber
TRIO_ARGS5((self, target, flags, width, base),
       trio_class_t *self,
       trio_uintmax_t *target,
       trio_flags_t flags,
       int width,
       int base)
{
  trio_uintmax_t number = 0;
  int digit;
  int count;
  BOOLEAN_T isNegative = FALSE;
  BOOLEAN_T gotNumber = FALSE;
  int j;

  assert(VALID(self));
  assert(VALID(self->InStream));
  assert((base >= MIN_BASE && base <= MAX_BASE) || (base == NO_BASE));

  if (internalDigitsUnconverted)
    {
      /* Lazy evaluation of digits array */
      memset(internalDigitArray, -1, sizeof(internalDigitArray));
      for (j = 0; j < (int)sizeof(internalDigitsLower) - 1; j++)
    {
      internalDigitArray[(int)internalDigitsLower[j]] = j;
      internalDigitArray[(int)internalDigitsUpper[j]] = j;
    }
      internalDigitsUnconverted = FALSE;
    }
  
  TrioSkipWhitespaces(self);
  
  if (!(flags & FLAGS_UNSIGNED))
    {
      /* Leading sign */
      if (self->current == '+')
    {
      self->InStream(self, NULL);
    }
      else if (self->current == '-')
    {
      self->InStream(self, NULL);
      isNegative = TRUE;
    }
    }
  
  count = self->processed;
  
  if (flags & FLAGS_ALTERNATIVE)
    {
      switch (base)
    {
    case NO_BASE:
    case BASE_OCTAL:
    case BASE_HEX:
    case BASE_BINARY:
      if (self->current == '0')
        {
          self->InStream(self, NULL);
          if (self->current)
        {
          if ((base == BASE_HEX) &&
              (trio_to_upper(self->current) == 'X'))
            {
              self->InStream(self, NULL);
            }
          else if ((base == BASE_BINARY) &&
               (trio_to_upper(self->current) == 'B'))
            {
              self->InStream(self, NULL);
            }
        }
        }
      else
        return FALSE;
      break;
    default:
      break;
    }
    }

  while (((width == NO_WIDTH) || (self->processed - count < width)) &&
     (! ((self->current == EOF) || isspace(self->current))))
    {
      if (isascii(self->current))
    {
      digit = internalDigitArray[self->current];
      /* Abort if digit is not allowed in the specified base */
      if ((digit == -1) || (digit >= base))
        break;
    }
      else if (flags & FLAGS_QUOTE)
    {
      /* Compare with thousands separator */
      for (j = 0; internalThousandSeparator[j] && self->current; j++)
        {
          if (internalThousandSeparator[j] != self->current)
        break;

          self->InStream(self, NULL);
        }
      if (internalThousandSeparator[j])
        break; /* Mismatch */
      else
        continue; /* Match */
    }
      else
    break;
            
      number *= base;
      number += digit;
      gotNumber = TRUE; /* we need at least one digit */

      self->InStream(self, NULL);
    }

  /* Was anything read at all? */
  if (!gotNumber)
    return FALSE;
  
  if (target)
    *target = (isNegative) ? -((trio_intmax_t)number) : number;
  return TRUE;
}

/*************************************************************************
 * TrioReadChar
 */
TRIO_PRIVATE int
TrioReadChar
TRIO_ARGS4((self, target, flags, width),
       trio_class_t *self,
       char *target,
       trio_flags_t flags,
       int width)
{
  int i;
  char ch;
  trio_uintmax_t number;
  
  assert(VALID(self));
  assert(VALID(self->InStream));

  for (i = 0;
       (self->current != EOF) && (i < width);
       i++)
    {
      ch = (char)self->current;
      self->InStream(self, NULL);
      if ((flags & FLAGS_ALTERNATIVE) && (ch == CHAR_BACKSLASH))
    {
      switch (self->current)
        {
        case '\\': ch = '\\'; break;
        case 'a': ch = '\007'; break;
        case 'b': ch = '\b'; break;
        case 'f': ch = '\f'; break;
        case 'n': ch = '\n'; break;
        case 'r': ch = '\r'; break;
        case 't': ch = '\t'; break;
        case 'v': ch = '\v'; break;
        default:
          if (isdigit(self->current))
        {
          /* Read octal number */
          if (!TrioReadNumber(self, &number, 0, 3, BASE_OCTAL))
            return 0;
          ch = (char)number;
        }
          else if (trio_to_upper(self->current) == 'X')
        {
          /* Read hexadecimal number */
          self->InStream(self, NULL);
          if (!TrioReadNumber(self, &number, 0, 2, BASE_HEX))
            return 0;
          ch = (char)number;
        }
          else
        {
          ch = (char)self->current;
        }
          break;
        }
    }
      
      if (target)
    target[i] = ch;
    }
  return i + 1;
}

/*************************************************************************
 * TrioReadString
 */
TRIO_PRIVATE BOOLEAN_T
TrioReadString
TRIO_ARGS4((self, target, flags, width),
       trio_class_t *self,
       char *target,
       trio_flags_t flags,
       int width)
{
  int i;
  
  assert(VALID(self));
  assert(VALID(self->InStream));

  TrioSkipWhitespaces(self);
    
  /*
   * Continue until end of string is reached, a whitespace is encountered,
   * or width is exceeded
   */
  for (i = 0;
       ((width == NO_WIDTH) || (i < width)) &&
       (! ((self->current == EOF) || isspace(self->current)));
       i++)
    {
      if (TrioReadChar(self, (target ? &target[i] : 0), flags, 1) == 0)
    break; /* for */
    }
  if (target)
    target[i] = NIL;
  return TRUE;
}

/*************************************************************************
 * TrioReadWideChar
 */
#if TRIO_WIDECHAR
TRIO_PRIVATE int
TrioReadWideChar
TRIO_ARGS4((self, target, flags, width),
       trio_class_t *self,
       trio_wchar_t *target,
       trio_flags_t flags,
       int width)
{
  int i;
  int j;
  int size;
  int amount = 0;
  trio_wchar_t wch;
  char buffer[MB_LEN_MAX + 1];
  
  assert(VALID(self));
  assert(VALID(self->InStream));

  for (i = 0;
       (self->current != EOF) && (i < width);
       i++)
    {
      if (isascii(self->current))
    {
      if (TrioReadChar(self, buffer, flags, 1) == 0)
        return 0;
      buffer[1] = NIL;
    }
      else
    {
      /*
       * Collect a multibyte character, by enlarging buffer until
       * it contains a fully legal multibyte character, or the
       * buffer is full.
       */
      j = 0;
      do
        {
          buffer[j++] = (char)self->current;
          buffer[j] = NIL;
          self->InStream(self, NULL);
        }
      while ((j < (int)sizeof(buffer)) && (mblen(buffer, (size_t)j) != j));
    }
      if (target)
    {
      size = mbtowc(&wch, buffer, sizeof(buffer));
      if (size > 0)
        target[i] = wch;
    }
      amount += size;
      self->InStream(self, NULL);
    }
  return amount;
}
#endif /* TRIO_WIDECHAR */

/*************************************************************************
 * TrioReadWideString
 */
#if TRIO_WIDECHAR
TRIO_PRIVATE BOOLEAN_T
TrioReadWideString
TRIO_ARGS4((self, target, flags, width),
       trio_class_t *self,
       trio_wchar_t *target,
       trio_flags_t flags,
       int width)
{
  int i;
  int size;
  
  assert(VALID(self));
  assert(VALID(self->InStream));

  TrioSkipWhitespaces(self);

#if defined(TRIO_COMPILER_SUPPORTS_MULTIBYTE)
  (void)mblen(NULL, 0);
#endif
  
  /*
   * Continue until end of string is reached, a whitespace is encountered,
   * or width is exceeded
   */
  for (i = 0;
       ((width == NO_WIDTH) || (i < width)) &&
       (! ((self->current == EOF) || isspace(self->current)));
       )
    {
      size = TrioReadWideChar(self, &target[i], flags, 1);
      if (size == 0)
    break; /* for */

      i += size;
    }
  if (target)
    target[i] = WCONST('\0');
  return TRUE;
}
#endif /* TRIO_WIDECHAR */

/*************************************************************************
 * TrioReadGroup
 *
 * FIXME: characterclass does not work with multibyte characters
 */
TRIO_PRIVATE BOOLEAN_T
TrioReadGroup
TRIO_ARGS5((self, target, characterclass, flags, width),
       trio_class_t *self,
       char *target,
       int *characterclass,
       trio_flags_t flags,
       int width)
{
  int ch;
  int i;
  
  assert(VALID(self));
  assert(VALID(self->InStream));

  ch = self->current;
  for (i = 0;
       ((width == NO_WIDTH) || (i < width)) &&
       (! ((ch == EOF) ||
       (((flags & FLAGS_EXCLUDE) != 0) ^ (characterclass[ch] == 0))));
       i++)
    {
      if (target)
    target[i] = (char)ch;
      self->InStream(self, &ch);
    }
  
  if (target)
    target[i] = NIL;
  return TRUE;
}

/*************************************************************************
 * TrioReadDouble
 *
 * FIXME:
 *  add long double
 *  handle base
 */
TRIO_PRIVATE BOOLEAN_T
TrioReadDouble
TRIO_ARGS4((self, target, flags, width),
       trio_class_t *self,
       trio_pointer_t target,
       trio_flags_t flags,
       int width)
{
  int ch;
  char doubleString[512];
  int index = 0;
  int start;
  int j;
  BOOLEAN_T isHex = FALSE;

  doubleString[0] = 0;
  
  if ((width == NO_WIDTH) || (width > (int)sizeof(doubleString) - 1))
    width = sizeof(doubleString) - 1;
  
  TrioSkipWhitespaces(self);
  
  /*
   * Read entire double number from stream. trio_to_double requires
   * a string as input, but InStream can be anything, so we have to
   * collect all characters.
   */
  ch = self->current;
  if ((ch == '+') || (ch == '-'))
    {
      doubleString[index++] = (char)ch;
      self->InStream(self, &ch);
      width--;
    }

  start = index;
  switch (ch)
    {
    case 'n':
    case 'N':
      /* Not-a-number */
      if (index != 0)
    break;
      /* FALLTHROUGH */
    case 'i':
    case 'I':
      /* Infinity */
      while (isalpha(ch) && (index - start < width))
    {
      doubleString[index++] = (char)ch;
      self->InStream(self, &ch);
    }
      doubleString[index] = NIL;

      /* Case insensitive string comparison */
      if (trio_equal(&doubleString[start], INFINITE_UPPER) ||
      trio_equal(&doubleString[start], LONG_INFINITE_UPPER))
    {
      if (flags & FLAGS_LONGDOUBLE)
        {
          if ((start == 1) && (doubleString[0] == '-'))
        {
          *((trio_long_double_t *)target) = trio_ninf();
        }
          else
        {
          *((trio_long_double_t *)target) = trio_pinf();
        }
        }
      else
        {
          if ((start == 1) && (doubleString[0] == '-'))
        {
          *((double *)target) = trio_ninf();
        }
          else
        {
          *((double *)target) = trio_pinf();
        }
        }
      return TRUE;
    }
      if (trio_equal(doubleString, NAN_UPPER))
    {
      /* NaN must not have a preceeding + nor - */
      if (flags & FLAGS_LONGDOUBLE)
        {
          *((trio_long_double_t *)target) = trio_nan();
        }
      else
        {
          *((double *)target) = trio_nan();
        }
      return TRUE;
    }
      return FALSE;

    case '0':
      doubleString[index++] = (char)ch;
      self->InStream(self, &ch);
      if (trio_to_upper(ch) == 'X')
    {
      isHex = TRUE;
      doubleString[index++] = (char)ch;
      self->InStream(self, &ch);
    }
      break;
      
    default:
      break;
    }
  
  while ((ch != EOF) && (index - start < width))
    {
      /* Integer part */
      if (isHex ? isxdigit(ch) : isdigit(ch))
    {
      doubleString[index++] = (char)ch;
      self->InStream(self, &ch);
    }
      else if (flags & FLAGS_QUOTE)
    {
      /* Compare with thousands separator */
      for (j = 0; internalThousandSeparator[j] && self->current; j++)
        {
          if (internalThousandSeparator[j] != self->current)
        break;

          self->InStream(self, &ch);
        }
      if (internalThousandSeparator[j])
        break; /* Mismatch */
      else
        continue; /* Match */
    }
      else
    break; /* while */
    }
  if (ch == '.')
    {
      /* Decimal part */
      doubleString[index++] = (char)ch;
      self->InStream(self, &ch);
      while ((isHex ? isxdigit(ch) : isdigit(ch)) &&
         (index - start < width))
    {
      doubleString[index++] = (char)ch;
      self->InStream(self, &ch);
    }
      if (isHex ? (trio_to_upper(ch) == 'P') : (trio_to_upper(ch) == 'E'))
    {
      /* Exponent */
      doubleString[index++] = (char)ch;
      self->InStream(self, &ch);
      if ((ch == '+') || (ch == '-'))
        {
          doubleString[index++] = (char)ch;
          self->InStream(self, &ch);
        }
      while (isdigit(ch) && (index - start < width))
        {
          doubleString[index++] = (char)ch;
          self->InStream(self, &ch);
        }
    }
    }

  if ((index == start) || (*doubleString == NIL))
    return FALSE;

  doubleString[index] = 0;
  
  if (flags & FLAGS_LONGDOUBLE)
    {
      *((trio_long_double_t *)target) = trio_to_long_double(doubleString, NULL);
    }
  else
    {
      *((double *)target) = trio_to_double(doubleString, NULL);
    }
  return TRUE;
}

/*************************************************************************
 * TrioReadPointer
 */
TRIO_PRIVATE BOOLEAN_T
TrioReadPointer
TRIO_ARGS3((self, target, flags),
       trio_class_t *self,
       trio_pointer_t *target,
       trio_flags_t flags)
{
  trio_uintmax_t number;
  char buffer[sizeof(internalNullString)];

  flags |= (FLAGS_UNSIGNED | FLAGS_ALTERNATIVE | FLAGS_NILPADDING);
  
  if (TrioReadNumber(self,
             &number,
             flags,
             POINTER_WIDTH,
             BASE_HEX))
    {
      /*
       * The strange assignment of number is a workaround for a compiler
       * warning
       */
      if (target)
    *target = (char *)0 + number;
      return TRUE;
    }
  else if (TrioReadString(self,
              (flags & FLAGS_IGNORE)
              ? NULL
              : buffer,
              0,
              sizeof(internalNullString) - 1))
    {  
      if (trio_equal_case(buffer, internalNullString))
    {
      if (target)
        *target = NULL;
      return TRUE;
    }
    }
  return FALSE;
}

/*************************************************************************
 * TrioScanProcess
 */
TRIO_PRIVATE int
TrioScanProcess
TRIO_ARGS3((data, format, parameters),
       trio_class_t *data,
       TRIO_CONST char *format,
       trio_parameter_t *parameters)
{
#if defined(TRIO_COMPILER_SUPPORTS_MULTIBYTE)
  int charlen;
  int cnt;
#endif
  int assignment;
  int ch;
  int index; /* Index of format string */
  int i; /* Index of current parameter */
  trio_flags_t flags;
  int width;
  int base;
  trio_pointer_t pointer;

  assignment = 0;
  i = 0;
  index = 0;
  data->InStream(data, &ch);

#if defined(TRIO_COMPILER_SUPPORTS_MULTIBYTE)
  (void)mblen(NULL, 0);
#endif

  while (format[index])
    {
#if defined(TRIO_COMPILER_SUPPORTS_MULTIBYTE)
      if (! isascii(format[index]))
    {
      charlen = mblen(&format[index], MB_LEN_MAX);
      if (charlen != -1)
        {
          /* Compare multibyte characters in format string */
          for (cnt = 0; cnt < charlen - 1; cnt++)
        {
          if (ch != format[index + cnt])
            {
              return TRIO_ERROR_RETURN(TRIO_EINVAL, index);
            }
          data->InStream(data, &ch);
        }
          continue; /* while characters left in formatting string */
        }
    }
#endif /* TRIO_COMPILER_SUPPORTS_MULTIBYTE */
      
      if ((EOF == ch) && (parameters[i].type != FORMAT_COUNT))
    {
      return (assignment > 0) ? assignment : EOF;
    }
      
      if (CHAR_IDENTIFIER == format[index])
    {
      if (CHAR_IDENTIFIER == format[index + 1])
        {
          /* Two % in format matches one % in input stream */
          if (CHAR_IDENTIFIER == ch)
        {
          data->InStream(data, &ch);
          index += 2;
          continue; /* while format chars left */
        }
          else
        return TRIO_ERROR_RETURN(TRIO_EINVAL, index);
        }

      /* Skip the parameter entries */
      while (parameters[i].type == FORMAT_PARAMETER)
        i++;
      
      flags = parameters[i].flags;
      /* Find width */
      width = parameters[i].width;
      if (flags & FLAGS_WIDTH_PARAMETER)
        {
          /* Get width from parameter list */
          width = (int)parameters[width].data.number.as_signed;
        }
      /* Find base */
      base = parameters[i].base;
      if (flags & FLAGS_BASE_PARAMETER)
        {
          /* Get base from parameter list */
          base = (int)parameters[base].data.number.as_signed;
        }
      
      switch (parameters[i].type)
        {
        case FORMAT_INT:
          {
        trio_uintmax_t number;

        if (0 == base)
          base = BASE_DECIMAL;

        if (!TrioReadNumber(data,
                    &number,
                    flags,
                    width,
                    base))
          return assignment;

        if (!(flags & FLAGS_IGNORE))
          {
            assignment++;

            pointer = parameters[i].data.pointer;
#if defined(QUALIFIER_SIZE_T) || defined(QUALIFIER_SIZE_T_UPPER)
            if (flags & FLAGS_SIZE_T)
              *(size_t *)pointer = (size_t)number;
            else
#endif
#if defined(QUALIFIER_PTRDIFF_T)
            if (flags & FLAGS_PTRDIFF_T)
              *(ptrdiff_t *)pointer = (ptrdiff_t)number;
            else
#endif
#if defined(QUALIFIER_INTMAX_T)
            if (flags & FLAGS_INTMAX_T)
              *(trio_intmax_t *)pointer = (trio_intmax_t)number;
            else
#endif
            if (flags & FLAGS_QUAD)
              *(trio_ulonglong_t *)pointer = (trio_ulonglong_t)number;
            else if (flags & FLAGS_LONG)
              *(long int *)pointer = (long int)number;
            else if (flags & FLAGS_SHORT)
              *(short int *)pointer = (short int)number;
            else
              *(int *)pointer = (int)number;
          }
          }
          break; /* FORMAT_INT */
          
        case FORMAT_STRING:
#if TRIO_WIDECHAR
          if (flags & FLAGS_WIDECHAR)
        {
          if (!TrioReadWideString(data,
                      (flags & FLAGS_IGNORE)
                      ? NULL
                      : parameters[i].data.wstring,
                      flags,
                      width))
            return assignment;
        }
          else
#endif
        {
          if (!TrioReadString(data,
                      (flags & FLAGS_IGNORE)
                      ? NULL
                      : parameters[i].data.string,
                      flags,
                      width))
            return assignment;
        }
          if (!(flags & FLAGS_IGNORE))
        assignment++;
          break; /* FORMAT_STRING */

        case FORMAT_DOUBLE:
          {
        trio_pointer_t pointer;

        if (flags & FLAGS_IGNORE)
          {
            pointer = NULL;
          }
        else
          {
            pointer = (flags & FLAGS_LONGDOUBLE)
              ? (trio_pointer_t)parameters[i].data.longdoublePointer
              : (trio_pointer_t)parameters[i].data.doublePointer;
          }
        if (!TrioReadDouble(data, pointer, flags, width))
          {
            return assignment;
          }
        if (!(flags & FLAGS_IGNORE))
          {
            assignment++;
          }
        break; /* FORMAT_DOUBLE */
          }
        case FORMAT_GROUP:
          {
        int characterclass[MAX_CHARACTER_CLASS + 1];
        int rc;

        /* Skip over modifiers */
        while (format[index] != SPECIFIER_GROUP)
          {
            index++;
          }
        /* Skip over group specifier */
        index++;
        
        memset(characterclass, 0, sizeof(characterclass));
        rc = TrioGetCharacterClass(format,
                       &index,
                       &flags,
                       characterclass);
        if (rc < 0)
          return rc;

        if (!TrioReadGroup(data,
                   (flags & FLAGS_IGNORE)
                   ? NULL
                   : parameters[i].data.string,
                   characterclass,
                   flags,
                   parameters[i].width))
          return assignment;
        if (!(flags & FLAGS_IGNORE))
          assignment++;
          }
          break; /* FORMAT_GROUP */

        case FORMAT_COUNT:
          pointer = parameters[i].data.pointer;
          if (NULL != pointer)
        {
          int count = data->committed;
          if (ch != EOF)
            count--; /* a character is read, but is not consumed yet */
#if defined(QUALIFIER_SIZE_T) || defined(QUALIFIER_SIZE_T_UPPER)
          if (flags & FLAGS_SIZE_T)
            *(size_t *)pointer = (size_t)count;
          else
#endif
#if defined(QUALIFIER_PTRDIFF_T)
          if (flags & FLAGS_PTRDIFF_T)
            *(ptrdiff_t *)pointer = (ptrdiff_t)count;
          else
#endif
#if defined(QUALIFIER_INTMAX_T)
          if (flags & FLAGS_INTMAX_T)
            *(trio_intmax_t *)pointer = (trio_intmax_t)count;
          else
#endif
          if (flags & FLAGS_QUAD)
            {
              *(trio_ulonglong_t *)pointer = (trio_ulonglong_t)count;
            }
          else if (flags & FLAGS_LONG)
            {
              *(long int *)pointer = (long int)count;
            }
          else if (flags & FLAGS_SHORT)
            {
              *(short int *)pointer = (short int)count;
            }
          else
            {
              *(int *)pointer = (int)count;
            }
        }
          break; /* FORMAT_COUNT */
          
        case FORMAT_CHAR:
#if TRIO_WIDECHAR
          if (flags & FLAGS_WIDECHAR)
        {
          if (TrioReadWideChar(data,
                       (flags & FLAGS_IGNORE)
                       ? NULL
                       : parameters[i].data.wstring,
                       flags,
                       (width == NO_WIDTH) ? 1 : width) == 0)
            return assignment;
        }
          else
#endif
        {
          if (TrioReadChar(data,
                   (flags & FLAGS_IGNORE)
                   ? NULL
                   : parameters[i].data.string,
                   flags,
                   (width == NO_WIDTH) ? 1 : width) == 0)
            return assignment;
        }
          if (!(flags & FLAGS_IGNORE))
        assignment++;
          break; /* FORMAT_CHAR */

        case FORMAT_POINTER:
          if (!TrioReadPointer(data,
                   (flags & FLAGS_IGNORE)
                   ? NULL
                   : (trio_pointer_t *)parameters[i].data.pointer,
                   flags))
        return assignment;
          if (!(flags & FLAGS_IGNORE))
        assignment++;
          break; /* FORMAT_POINTER */

        case FORMAT_PARAMETER:
          break; /* FORMAT_PARAMETER */

        default:
          return TRIO_ERROR_RETURN(TRIO_EINVAL, index);
        }
      ch = data->current;
      index = parameters[i].indexAfterSpecifier;
      i++;
    }
      else /* Not an % identifier */
    {
      if (isspace((int)format[index]))
        {
          /* Whitespaces may match any amount of whitespaces */
          ch = TrioSkipWhitespaces(data);
        }
      else if (ch == format[index])
        {
          data->InStream(data, &ch);
        }
      else
        return assignment;
      
      index++;
    }
    }
  return assignment;
}

/*************************************************************************
 * TrioScan
 */
TRIO_PRIVATE int
TrioScan
TRIO_ARGS6((source, sourceSize, InStream, format, arglist, argarray),
       trio_pointer_t source,
       size_t sourceSize,
       void (*InStream) TRIO_PROTO((trio_class_t *, int *)),
       TRIO_CONST char *format,
       va_list *arglist,
       trio_pointer_t *argarray)
{
  int status;
  trio_parameter_t parameters[MAX_PARAMETERS];
  trio_class_t data;

  assert(VALID(InStream));
  assert(VALID(format));

  memset(&data, 0, sizeof(data));
  data.InStream = InStream;
  data.location = (trio_pointer_t)source;
  data.max = sourceSize;
  data.error = 0;

#if defined(USE_LOCALE)
  if (NULL == internalLocaleValues)
    {
      TrioSetLocale();
    }
#endif
  
  status = TrioParse(TYPE_SCAN, format, parameters, arglist, argarray);
  if (status < 0)
    return status;

  status = TrioScanProcess(&data, format, parameters);
  if (data.error != 0)
    {
      status = data.error;
    }
  return status;
}

/*************************************************************************
 * TrioInStreamFile
 */
TRIO_PRIVATE void
TrioInStreamFile
TRIO_ARGS2((self, intPointer),
       trio_class_t *self,
       int *intPointer)
{
  FILE *file = (FILE *)self->location;

  assert(VALID(self));
  assert(VALID(file));

  self->current = fgetc(file);
  if (self->current == EOF)
    {
      self->error = (ferror(file))
    ? TRIO_ERROR_RETURN(TRIO_ERRNO, 0)
    : TRIO_ERROR_RETURN(TRIO_EOF, 0);
    }
  else
    {
      self->processed++;
      self->committed++;
    }
  
  if (VALID(intPointer))
    {
      *intPointer = self->current;
    }
}

/*************************************************************************
 * TrioInStreamFileDescriptor
 */
TRIO_PRIVATE void
TrioInStreamFileDescriptor
TRIO_ARGS2((self, intPointer),
       trio_class_t *self,
       int *intPointer)
{
  int fd = *((int *)self->location);
  int size;
  unsigned char input;

  assert(VALID(self));

  size = read(fd, &input, sizeof(char));
  if (size == -1)
    {
      self->error = TRIO_ERROR_RETURN(TRIO_ERRNO, 0);
      self->current = EOF;
    }
  else
    {
      self->current = (size == 0) ? EOF : input;
    }
  if (self->current != EOF)
    {
      self->committed++;
      self->processed++;
    }
  
  if (VALID(intPointer))
    {
      *intPointer = self->current;
    }
}

/*************************************************************************
 * TrioInStreamCustom
 */
TRIO_PRIVATE void
TrioInStreamCustom
TRIO_ARGS2((self, intPointer),
       trio_class_t *self,
       int *intPointer)
{
  trio_custom_t *data;
  
  assert(VALID(self));
  assert(VALID(self->location));

  data = (trio_custom_t *)self->location;

  self->current = (data->stream.in == NULL)
    ? NIL
    : (data->stream.in)(data->closure);
  
  if (self->current == NIL)
    {
      self->current = EOF;
    }
  else
    {
      self->processed++;
      self->committed++;
    }
  
  if (VALID(intPointer))
    {
      *intPointer = self->current;
    }
}

/*************************************************************************
 * TrioInStreamString
 */
TRIO_PRIVATE void
TrioInStreamString
TRIO_ARGS2((self, intPointer),
       trio_class_t *self,
       int *intPointer)
{
  unsigned char **buffer;

  assert(VALID(self));
  assert(VALID(self->location));

  buffer = (unsigned char **)self->location;
  self->current = (*buffer)[0];
  if (self->current == NIL)
    {
      self->current = EOF;
    }
  else
    {
      (*buffer)++;
      self->processed++;
      self->committed++;
    }
  
  if (VALID(intPointer))
    {
      *intPointer = self->current;
    }
}

/*************************************************************************
 *
 * Formatted scanning functions
 *
 ************************************************************************/

#if defined(TRIO_DOCUMENTATION)
# include "doc/doc_scanf.h"
#endif

/*************************************************************************
 * scanf
 */

TRIO_PUBLIC int
trio_scanf
TRIO_VARGS2((format, va_alist),
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  int status;
  va_list args;

  assert(VALID(format));
  
  TRIO_VA_START(args, format);
  status = TrioScan((trio_pointer_t)stdin, 0,
            TrioInStreamFile,
            format, &args, NULL);
  TRIO_VA_END(args);
  return status;
}

TRIO_PUBLIC int
trio_vscanf
TRIO_ARGS2((format, args),
       TRIO_CONST char *format,
       va_list args)
{
  assert(VALID(format));
  
  return TrioScan((trio_pointer_t)stdin, 0,
          TrioInStreamFile,
          format, &args, NULL);
}

TRIO_PUBLIC int
trio_scanfv
TRIO_ARGS2((format, args),
       TRIO_CONST char *format,
       trio_pointer_t *args)
{
  assert(VALID(format));
  
  return TrioScan((trio_pointer_t)stdin, 0,
          TrioInStreamFile,
          format, NULL, args);
}

/*************************************************************************
 * fscanf
 */
TRIO_PUBLIC int
trio_fscanf
TRIO_VARGS3((file, format, va_alist),
        FILE *file,
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  int status;
  va_list args;

  assert(VALID(file));
  assert(VALID(format));
  
  TRIO_VA_START(args, format);
  status = TrioScan((trio_pointer_t)file, 0,
            TrioInStreamFile,
            format, &args, NULL);
  TRIO_VA_END(args);
  return status;
}

TRIO_PUBLIC int
trio_vfscanf
TRIO_ARGS3((file, format, args),
       FILE *file,
       TRIO_CONST char *format,
       va_list args)
{
  assert(VALID(file));
  assert(VALID(format));
  
  return TrioScan((trio_pointer_t)file, 0,
          TrioInStreamFile,
          format, &args, NULL);
}

TRIO_PUBLIC int
trio_fscanfv
TRIO_ARGS3((file, format, args),
       FILE *file,
       TRIO_CONST char *format,
       trio_pointer_t *args)
{
  assert(VALID(file));
  assert(VALID(format));
  
  return TrioScan((trio_pointer_t)file, 0,
          TrioInStreamFile,
          format, NULL, args);
}

/*************************************************************************
 * dscanf
 */
TRIO_PUBLIC int
trio_dscanf
TRIO_VARGS3((fd, format, va_alist),
        int fd,
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  int status;
  va_list args;

  assert(VALID(format));
  
  TRIO_VA_START(args, format);
  status = TrioScan((trio_pointer_t)&fd, 0,
            TrioInStreamFileDescriptor,
            format, &args, NULL);
  TRIO_VA_END(args);
  return status;
}

TRIO_PUBLIC int
trio_vdscanf
TRIO_ARGS3((fd, format, args),
       int fd,
       TRIO_CONST char *format,
       va_list args)
{
  assert(VALID(format));
  
  return TrioScan((trio_pointer_t)&fd, 0,
          TrioInStreamFileDescriptor,
          format, &args, NULL);
}

TRIO_PUBLIC int
trio_dscanfv
TRIO_ARGS3((fd, format, args),
       int fd,
       TRIO_CONST char *format,
       trio_pointer_t *args)
{
  assert(VALID(format));
  
  return TrioScan((trio_pointer_t)&fd, 0,
          TrioInStreamFileDescriptor,
          format, NULL, args);
}

/*************************************************************************
 * cscanf
 */
TRIO_PUBLIC int
trio_cscanf
TRIO_VARGS4((stream, closure, format, va_alist),
        trio_instream_t stream,
        trio_pointer_t closure,
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  int status;
  va_list args;
  trio_custom_t data;

  assert(VALID(stream));
  assert(VALID(format));
  
  TRIO_VA_START(args, format);
  data.stream.in = stream;
  data.closure = closure;
  status = TrioScan(&data, 0, TrioInStreamCustom, format, &args, NULL);
  TRIO_VA_END(args);
  return status;
}

TRIO_PUBLIC int
trio_vcscanf
TRIO_ARGS4((stream, closure, format, args),
       trio_instream_t stream,
       trio_pointer_t closure,
       TRIO_CONST char *format,
       va_list args)
{
  trio_custom_t data;
  
  assert(VALID(stream));
  assert(VALID(format));

  data.stream.in = stream;
  data.closure = closure;
  return TrioScan(&data, 0, TrioInStreamCustom, format, &args, NULL);
}

TRIO_PUBLIC int
trio_cscanfv
TRIO_ARGS4((stream, closure, format, args),
       trio_instream_t stream,
       trio_pointer_t closure,
       TRIO_CONST char *format,
       trio_pointer_t *args)
{
  trio_custom_t data;
  
  assert(VALID(stream));
  assert(VALID(format));

  data.stream.in = stream;
  data.closure = closure;
  return TrioScan(&data, 0, TrioInStreamCustom, format, NULL, args);
}

/*************************************************************************
 * sscanf
 */
TRIO_PUBLIC int
trio_sscanf
TRIO_VARGS3((buffer, format, va_alist),
        TRIO_CONST char *buffer,
        TRIO_CONST char *format,
        TRIO_VA_DECL)
{
  int status;
  va_list args;

  assert(VALID(buffer));
  assert(VALID(format));
  
  TRIO_VA_START(args, format);
  status = TrioScan((trio_pointer_t)&buffer, 0,
            TrioInStreamString,
            format, &args, NULL);
  TRIO_VA_END(args);
  return status;
}

TRIO_PUBLIC int
trio_vsscanf
TRIO_ARGS3((buffer, format, args),
       TRIO_CONST char *buffer,
       TRIO_CONST char *format,
       va_list args)
{
  assert(VALID(buffer));
  assert(VALID(format));
  
  return TrioScan((trio_pointer_t)&buffer, 0,
          TrioInStreamString,
          format, &args, NULL);
}

TRIO_PUBLIC int
trio_sscanfv
TRIO_ARGS3((buffer, format, args),
       TRIO_CONST char *buffer,
       TRIO_CONST char *format,
       trio_pointer_t *args)
{
  assert(VALID(buffer));
  assert(VALID(format));
  
  return TrioScan((trio_pointer_t)&buffer, 0,
          TrioInStreamString,
          format, NULL, args);
}

/*************************************************************************
 * trio_strerror
 */
TRIO_PUBLIC TRIO_CONST char *
trio_strerror
TRIO_ARGS1((errorcode),
       int errorcode)
{
  /* Textual versions of the error codes */
  switch (TRIO_ERROR_CODE(errorcode))
    {
    case TRIO_EOF:
      return "End of file";
    case TRIO_EINVAL:
      return "Invalid argument";
    case TRIO_ETOOMANY:
      return "Too many arguments";
    case TRIO_EDBLREF:
      return "Double reference";
    case TRIO_EGAP:
      return "Reference gap";
    case TRIO_ENOMEM:
      return "Out of memory";
    case TRIO_ERANGE:
      return "Invalid range";
    case TRIO_ECUSTOM:
      return "Custom error";
    default:
      return "Unknown";
    }
}