fcvtbuf.c File Reference

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <float.h>
#include <math.h>
#include <malloc.h>

Include dependency graph for fcvtbuf.c:

Go to the source code of this file.

Macros
#define	CVTBUFSIZE   2 * DBL_MAX_10_EXP + 10

Functions
static char *	cvt (double arg, int ndigits, int *decpt, int *sign, char *buf, int eflag)
char *	fcvtbuf (double arg, int ndigits, int *decpt, int *sign, char *buf)

Macro Definition Documentation

CVTBUFSIZE

#define CVTBUFSIZE   2 * DBL_MAX_10_EXP + 10

Definition at line 44 of file fcvtbuf.c.

Function Documentation

cvt()

static char * cvt ( double  arg, int  ndigits, int *  decpt, int *  sign, char *  buf, int  eflag  )

static

Definition at line 45 of file fcvtbuf.c.

{
  int r2;
  double fi, fj;
  char *p, *p1;
 
  if (_isnan(arg))
  {
    snprintf(buf, ndigits, "1.#QNAN");
    *decpt = 0;
    *sign = 0;
    return buf;
  }
  if (!_finite(arg))
  {
    snprintf(buf, ndigits, "1.#INF");
    *decpt = 0;
    *sign = 0;
    return buf;
  }
 
  if (ndigits >= CVTBUFSIZE - 1) ndigits = CVTBUFSIZE - 2;
  r2 = 0;
  *sign = 0;
  p = &buf[0];
  if (arg < 0)
  {
    *sign = 1;
    arg = -arg;
  }
  arg = modf(arg, &fi);
  p1 = &buf[CVTBUFSIZE];
 
  if (fi != 0)
  {
    p1 = &buf[CVTBUFSIZE];
    while (fi != 0)
    {
      fj = modf(fi / 10, &fi);
      *--p1 = (int)((fj + .03) * 10) + '0';
      r2++;
    }
    while (p1 < &buf[CVTBUFSIZE]) *p++ = *p1++;
  }
  else if (arg > 0)
  {
    while ((fj = arg * 10) < 1)
    {
      arg = fj;
      r2--;
    }
  }
  p1 = &buf[ndigits];
  if (eflag == 0) p1 += r2;
  *decpt = r2;
  if (p1 < &buf[0])
  {
    buf[0] = '\0';
    return buf;
  }
  while (p <= p1 && p < &buf[CVTBUFSIZE])
  {
    arg *= 10;
    arg = modf(arg, &fj);
    *p++ = (int) fj + '0';
  }
  if (p1 >= &buf[CVTBUFSIZE])
  {
    buf[CVTBUFSIZE - 1] = '\0';
    return buf;
  }
  p = p1;
  *p1 += 5;
  while (*p1 > '9')
  {
    *p1 = '0';
    if (p1 > buf)
      ++*--p1;
    else
    {
      *p1 = '1';
      (*decpt)++;
      if (eflag == 0)
      {
        if (p > buf) *p = '0';
        p++;
      }
    }
  }
  *p = '\0';
  return buf;
}

Referenced by __acrt_GetModuleFileNameA(), _access_s(), _chmod(), _mkdir(), _rmdir(), _sopen_nolock(), common_stat(), fcvtbuf(), get_file_name(), _Locale_impl::insert_ctype_facets(), remove(), and CodecvtTest::special_encodings().

fcvtbuf()

char * fcvtbuf	(	double	arg,
		int	ndigits,
		int *	decpt,
		int *	sign,
		char *	buf
	)

Definition at line 138 of file fcvtbuf.c.

{
  return cvt(arg, ndigits, decpt, sign, buf, 0);
}

Referenced by _fcvt().