g_ffmt.c File Reference

#include "gdtoaimp.h"

Include dependency graph for g_ffmt.c:

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Functions
char *	g_ffmt (char *buf, float *f, int ndig, unsigned bufsize)

Function Documentation

g_ffmt()

char* g_ffmt	(	char *	buf,
		float *	f,
		int	ndig,
		unsigned	bufsize
	)

Definition at line 41 of file g_ffmt.c.

{
    static FPI fpi = {24, 1 - 127 - 24 + 1, 254 - 127 - 24 + 1, 1, 0};
    char *b, *s, *se;
    ULong bits[1], *L, sign;
    int decpt, ex, i, mode;

    if(ndig < 0)
    {
        ndig = 0;
    }
    if(bufsize < (unsigned)(ndig + 10))
    {
        return 0;
    }

    L = (ULong*)f;
    sign = L[0] & 0x80000000L;
    if((L[0] & 0x7f800000) == 0x7f800000)
    {
        /* Infinity or NaN */
        if(L[0] & 0x7fffff)
        {
            return strcp(buf, "NaN");
        }
        b = buf;
        if(sign)
        {
            {
                *b++ = '-';
            }
        }
        return strcp(b, "Infinity");
    }
    if(*f == 0.0F)
    {
        b = buf;
#ifndef IGNORE_ZERO_SIGN
        if(L[0] & 0x80000000L)
        {
            {
                *b++ = '-';
            }
        }
#endif
        *b++ = '0';
        *b = 0;
        return b;
    }
    bits[0] = L[0] & 0x7fffff;
    if((ex = (L[0] >> 23) & 0xff) != 0)
    {
        {
            bits[0] |= 0x800000;
        }
    }
    else
    {
        {
            ex = 1;
        }
    }
    ex -= 0x7f + 23;
    mode = 2;
    if(ndig <= 0)
    {
        if(bufsize < 16)
        {
            return 0;
        }
        mode = 0;
    }
    i = STRTOG_Normal;
    s = gdtoa(&fpi, ex, bits, &i, mode, ndig, &decpt, &se);
    return g__fmt(buf, s, se, decpt, sign);
}

References g__fmt(), gdtoa(), strcp, and STRTOG_Normal.