vfprintf.c File Reference

#include <stdio.h>
#include <stdarg.h>

Include dependency graph for vfprintf.c:

Go to the source code of this file.

Functions
int __cdecl	streamout (FILE *stream, const char *format, va_list argptr)
int __cdecl	vfprintf (FILE *file, const char *format, va_list argptr)

Function Documentation

streamout()

int __cdecl streamout	(	FILE *	stream,
		const char *	format,
		va_list	argptr
	)

Definition at line 326 of file streamout.c.

{
    static const TCHAR digits_l[] = _T("0123456789abcdef0x");
    static const TCHAR digits_u[] = _T("0123456789ABCDEF0X");
    static const char *_nullstring = "(null)";
    TCHAR buffer[BUFFER_SIZE + 1];
    TCHAR chr, *string;
    STRING *nt_string;
    const TCHAR *digits, *prefix;
    int base, fieldwidth, precision, padding;
    size_t prefixlen, len;
    int written = 1, written_all = 0;
    unsigned int flags;
    unsigned __int64 val64;

    buffer[BUFFER_SIZE] = '\0';

    while (written >= 0)
    {
        chr = *format++;

        /* Check for end of format string */
        if (chr == _T('\0')) break;

        /* Check for 'normal' character or double % */
        if ((chr != _T('%')) ||
            (chr = *format++) == _T('%'))
        {
            /* Write the character to the stream */
            if ((written = streamout_char(stream, chr)) == 0) return -1;
            written_all += written;
            continue;
        }

        /* Handle flags */
        flags = 0;
        while (1)
        {
                 if (chr == _T('-')) flags |= FLAG_ALIGN_LEFT;
            else if (chr == _T('+')) flags |= FLAG_FORCE_SIGN;
            else if (chr == _T(' ')) flags |= FLAG_FORCE_SIGNSP;
            else if (chr == _T('0')) flags |= FLAG_PAD_ZERO;
            else if (chr == _T('#')) flags |= FLAG_SPECIAL;
            else break;
            chr = *format++;
        }

        /* Handle field width modifier */
        if (chr == _T('*'))
        {
#ifdef _USER32_WSPRINTF
            if ((written = streamout_char(stream, chr)) == 0) return -1;
            written_all += written;
            continue;
#else
            fieldwidth = va_arg(argptr, int);
            if (fieldwidth < 0)
            {
                flags |= FLAG_ALIGN_LEFT;
                fieldwidth = -fieldwidth;
            }
            chr = *format++;
#endif
        }
        else
        {
            fieldwidth = 0;
            while (chr >= _T('0') && chr <= _T('9'))
            {
                fieldwidth = fieldwidth * 10 + (chr - _T('0'));
                chr = *format++;
            }
        }

        /* Handle precision modifier */
        if (chr == '.')
        {
            chr = *format++;

            if (chr == _T('*'))
            {
#ifdef _USER32_WSPRINTF
                if ((written = streamout_char(stream, chr)) == 0) return -1;
                written_all += written;
                continue;
#else
                precision = va_arg(argptr, int);
                chr = *format++;
#endif
            }
            else
            {
                precision = 0;
                while (chr >= _T('0') && chr <= _T('9'))
                {
                    precision = precision * 10 + (chr - _T('0'));
                    chr = *format++;
                }
            }
        }
        else precision = -1;

        /* Handle argument size prefix */
        do
        {
                 if (chr == _T('h')) flags |= FLAG_SHORT;
            else if (chr == _T('w')) flags |= FLAG_WIDECHAR;
            else if (chr == _T('L')) flags |= 0; // FIXME: long double
            else if (chr == _T('F')) flags |= 0; // FIXME: what is that?
            else if (chr == _T('l'))
            {
                /* Check if this is the 2nd 'l' in a row */
                if (format[-2] == 'l') flags |= FLAG_INT64;
                else flags |= FLAG_LONG;
            }
            else if (chr == _T('I'))
            {
                if (format[0] == _T('3') && format[1] == _T('2'))
                {
                    format += 2;
                }
                else if (format[0] == _T('6') && format[1] == _T('4'))
                {
                    format += 2;
                    flags |= FLAG_INT64;
                }
                else if (format[0] == _T('x') || format[0] == _T('X') ||
                         format[0] == _T('d') || format[0] == _T('i') ||
                         format[0] == _T('u') || format[0] == _T('o'))
                {
                    flags |= FLAG_INTPTR;
                }
                else break;
            }
            else break;
            chr = *format++;
        }
        while (USE_MULTISIZE);

        /* Handle the format specifier */
        digits = digits_l;
        string = &buffer[BUFFER_SIZE];
        base = 10;
        prefix = 0;
        switch (chr)
        {
            case _T('n'):
                if (flags & FLAG_INT64)
                    *va_arg(argptr, __int64*) = written_all;
                else if (flags & FLAG_SHORT)
                    *va_arg(argptr, short*) = written_all;
                else
                    *va_arg(argptr, int*) = written_all;
                continue;

            case _T('C'):
#ifndef _UNICODE
                if (!(flags & FLAG_SHORT)) flags |= FLAG_WIDECHAR;
#endif
                goto case_char;

            case _T('c'):
#ifdef _UNICODE
                if (!(flags & FLAG_SHORT)) flags |= FLAG_WIDECHAR;
#endif
            case_char:
                string = buffer;
                len = 1;
                if (flags & FLAG_WIDECHAR)
                {
                    ((wchar_t*)string)[0] = va_arg(argptr, int);
                    ((wchar_t*)string)[1] = _T('\0');
                }
                else
                {
                    ((char*)string)[0] = va_arg(argptr, int);
                    ((char*)string)[1] = _T('\0');
                }
                break;

            case _T('Z'):
                nt_string = va_arg(argptr, void*);
                if (nt_string && (string = nt_string->Buffer))
                {
                    len = nt_string->Length;
                    if (flags & FLAG_WIDECHAR) len /= sizeof(wchar_t);
                    break;
                }
                string = 0;
                goto case_string;

            case _T('S'):
                string = va_arg(argptr, void*);
#ifndef _UNICODE
                if (!(flags & FLAG_SHORT)) flags |= FLAG_WIDECHAR;
#endif
                goto case_string;

            case _T('s'):
                string = va_arg(argptr, void*);
#ifdef _UNICODE
                if (!(flags & FLAG_SHORT)) flags |= FLAG_WIDECHAR;
#endif

            case_string:
                if (!string)
                {
                    string = (TCHAR*)_nullstring;
                    flags &= ~FLAG_WIDECHAR;
                }

                if (flags & FLAG_WIDECHAR)
                    len = wcsnlen((wchar_t*)string, (unsigned)precision);
                else
                    len = strnlen((char*)string, (unsigned)precision);
                precision = 0;
                break;

#ifndef _USER32_WSPRINTF
            case _T('G'):
            case _T('E'):
            case _T('A'):
            case _T('g'):
            case _T('e'):
            case _T('a'):
            case _T('f'):
#ifdef _UNICODE
                flags |= FLAG_WIDECHAR;
#else
                flags &= ~FLAG_WIDECHAR;
#endif
                /* Use external function, one for kernel one for user mode */
                format_float(chr, flags, precision, &string, &prefix, &argptr);
                len = _tcslen(string);
                precision = 0;
                break;
#endif

            case _T('d'):
            case _T('i'):
                val64 = (__int64)va_arg_f(argptr, flags);

                if ((__int64)val64 < 0)
                {
                    val64 = -(__int64)val64;
                    prefix = _T("-");
                }
                else if (flags & FLAG_FORCE_SIGN)
                    prefix = _T("+");
                else if (flags & FLAG_FORCE_SIGNSP)
                    prefix = _T(" ");

                goto case_number;

            case _T('o'):
                base = 8;
                if (flags & FLAG_SPECIAL)
                {
                    prefix = _T("0");
                    if (precision > 0) precision--;
                }
                goto case_unsigned;

            case _T('p'):
                precision = 2 * sizeof(void*);
                flags &= ~FLAG_PAD_ZERO;
                flags |= FLAG_INTPTR;
                /* Fall through */

            case _T('X'):
                digits = digits_u;
                /* Fall through */

            case _T('x'):
                base = 16;
                if (flags & FLAG_SPECIAL)
                {
                    prefix = &digits[16];
#ifdef _USER32_WSPRINTF
                    fieldwidth += 2;
#endif
                }

            case _T('u'):
            case_unsigned:
                val64 = va_arg_fu(argptr, flags);

            case_number:
#ifdef _UNICODE
                flags |= FLAG_WIDECHAR;
#else
                flags &= ~FLAG_WIDECHAR;
#endif
                if (precision < 0) precision = 1;

                /* Gather digits in reverse order */
                while (val64)
                {
                    *--string = digits[val64 % base];
                    val64 /= base;
                    precision--;
                }

                len = _tcslen(string);
                break;

            default:
                /* Treat anything else as a new character */
                format--;
                continue;
        }

        /* Calculate padding */
        prefixlen = prefix ? _tcslen(prefix) : 0;
        if (precision < 0) precision = 0;
        padding = (int)(fieldwidth - len - prefixlen - precision);
        if (padding < 0) padding = 0;

        /* Optional left space padding */
        if ((flags & (FLAG_ALIGN_LEFT | FLAG_PAD_ZERO)) == 0)
        {
            for (; padding > 0; padding--)
            {
                if ((written = streamout_char(stream, _T(' '))) == 0) return -1;
                written_all += written;
            }
        }

        /* Optional prefix */
        if (prefix)
        {
            written = streamout_string(stream, prefix, prefixlen);
            if (written == -1) return -1;
            written_all += written;
        }

        /* Optional left '0' padding */
        if ((flags & FLAG_ALIGN_LEFT) == 0) precision += padding;
        while (precision-- > 0)
        {
            if ((written = streamout_char(stream, _T('0'))) == 0) return -1;
            written_all += written;
        }

        /* Output the string */
        if (flags & FLAG_WIDECHAR)
            written = streamout_wstring(stream, (wchar_t*)string, len);
        else
            written = streamout_astring(stream, (char*)string, len);
        if (written == -1) return -1;
        written_all += written;

#if 0 && SUPPORT_FLOAT
        /* Optional right '0' padding */
        while (precision-- > 0)
        {
            if ((written = streamout_char(stream, _T('0'))) == 0) return -1;
            written_all += written;
            len++;
        }
#endif

        /* Optional right padding */
        if (flags & FLAG_ALIGN_LEFT)
        {
            while (padding-- > 0)
            {
                if ((written = streamout_char(stream, _T(' '))) == 0) return -1;
                written_all += written;
            }
        }

    }

    if (written == -1) return -1;

    return written_all;
}

Referenced by vfprintf().

vfprintf()

int __cdecl vfprintf	(	FILE *	file,
		const char *	format,
		va_list	argptr
	)

Definition at line 16 of file vfprintf.c.

{
    int result;

    _lock_file(file);
    result = streamout(file, format, argptr);
    _unlock_file(file);

    return result;
}