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/* @(#)cvt.c 1.4 01/02/23 Copyright 1998 J. Schilling */
/*
* Compatibility routines for 4.4BSD based C-libraries ecvt()/fcvt()
* and a working gcvt() that is needed on 4.4BSD and GNU libc systems.
*
* On 4.4BSD, gcvt() is missing, the gcvt() implementation from GNU libc
* is not working correctly.
*
* Neither __dtoa() nor [efg]cvt() are MT safe.
*
* Copyright (c) 1998 J. Schilling
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdxlib.h>
#include <utypes.h>
#include <standard.h>
#ifdef HAVE_DTOA /* 4.4BSD floating point implementation */
#ifdef HAVE_DTOA_R
extern char *__dtoa __PR((double value, int mode, int ndigit, int *decpt, int *sign, char **ep, char **resultp));
#else
extern char *__dtoa __PR((double value, int mode, int ndigit, int *decpt, int *sign, char **ep));
#endif
#endif
#ifndef HAVE_ECVT
EXPORT char *ecvt __PR((double value, int ndigit, int *decpt, int *sign));
#endif
#ifndef HAVE_FCVT
EXPORT char *fcvt __PR((double value, int ndigit, int *decpt, int *sign));
#endif
#ifndef HAVE_GCVT
EXPORT char *gcvt __PR((double value, int ndigit, char *buf));
#endif
#if !defined(HAVE_ECVT) && defined(HAVE_DTOA)
#define HAVE_ECVT
char *
ecvt(value, ndigit, decpt, sign)
double value;
int ndigit;
int *decpt;
int *sign;
{
static Uint bufsize;
static char *buf;
char *bufend;
char *ep;
char *bp;
#ifdef HAVE_DTOA_R
static char *result;
#endif
#ifdef HAVE_DTOA_R
if (result) {
free(result);
result = NULL;
}
bp = __dtoa(value, 2, ndigit, decpt, sign, &ep, &result);
#else
bp = __dtoa(value, 2, ndigit, decpt, sign, &ep);
#endif
if (value == 0.0) {
/*
* Handle __dtoa()'s deviation from ecvt():
* 0.0 is converted to "0" instead of 'ndigit' zeroes.
* The string "0" is not allocated, so
* we need to allocate buffer to hold 'ndigit' zeroes.
*/
if (bufsize < ndigit + 1) {
if (buf != (char *)0)
free(buf);
bufsize = ndigit + 1;
buf = malloc(bufsize);
}
ep = bp = buf;
}
/*
* Fill up trailing zeroes suppressed by __dtoa()
* From an internal __dtoa() comment:
* Sufficient space is allocated to the return value
* to hold the suppressed trailing zeros.
*/
for (bufend = &bp[ndigit]; ep < bufend; )
*ep++ = '0';
*ep = '\0';
return (bp);
}
#endif
#if !defined(HAVE_FCVT) && defined(HAVE_DTOA)
#define HAVE_FCVT
char *
fcvt(value, ndigit, decpt, sign)
double value;
int ndigit;
int *decpt;
int *sign;
{
static Uint bufsize;
static char *buf;
char *bufend;
char *ep;
char *bp;
#ifdef HAVE_DTOA_R
static char *result;
#endif
#ifdef HAVE_DTOA_R
if (result) {
free(result);
result = NULL;
}
bp = __dtoa(value, 3, ndigit, decpt, sign, &ep, &result);
#else
bp = __dtoa(value, 3, ndigit, decpt, sign, &ep);
#endif
if (value == 0.0) {
/*
* Handle __dtoa()'s deviation from fcvt():
* 0.0 is converted to "0" instead of 'ndigit' zeroes.
* The string "0" is not allocated, so
* we need to allocate buffer to hold 'ndigit' zeroes.
*/
if (bufsize < ndigit + 1) {
if (buf != (char *)0)
free(buf);
bufsize = ndigit + 1;
buf = malloc(bufsize);
}
ep = bp = buf;
*decpt = 0;
}
/*
* Fill up trailing zeroes suppressed by __dtoa()
* From an internal __dtoa() comment:
* Sufficient space is allocated to the return value
* to hold the suppressed trailing zeros.
*/
for (bufend = &bp[*decpt + ndigit]; ep < bufend; )
*ep++ = '0';
*ep = '\0';
return (bp);
}
#endif
#ifndef HAVE_GCVT
#define HAVE_GCVT
char *
gcvt(number, ndigit, buf)
double number;
int ndigit;
char *buf;
{
int sign;
int decpt;
register char *b;
register char *rs;
register int i;
b = ecvt(number, ndigit, &decpt, &sign);
rs = buf;
if (sign)
*rs++ = '-';
for (i = ndigit-1; i > 0 && b[i] == '0'; i--)
ndigit--;
#ifdef V7_FLOATSTYLE
if ((decpt >= 0 && decpt-ndigit > 4) ||
#else
if ((decpt >= 0 && decpt-ndigit > 0) ||
#endif
(decpt < 0 && decpt < -3)) { /* e-format */
decpt--;
*rs++ = *b++;
*rs++ = '.';
for (i = 1; i < ndigit; i++)
*rs++ = *b++;
*rs++ = 'e';
if (decpt < 0) {
decpt = -decpt;
*rs++ = '-';
} else {
*rs++ = '+';
}
if (decpt >= 100) {
*rs++ = decpt / 100 + '0';
decpt %= 100;
}
*rs++ = decpt / 10 + '0';
*rs++ = decpt % 10 + '0';
} else { /* f-format */
if (decpt <= 0) {
if (*b != '0') {
#ifndef V7_FLOATSTYLE
*rs++ = '0';
#endif
*rs++ = '.';
}
while (decpt < 0) {
decpt++;
*rs++ = '0';
}
}
for (i = 1; i <= ndigit; i++) {
*rs++ = *b++;
if (i == decpt)
*rs++ = '.';
}
if (ndigit < decpt) {
while (ndigit++ < decpt)
*rs++ = '0';
*rs++ = '.';
}
}
if (rs[-1] == '.')
rs--;
*rs = '\0';
return (buf);
}
#endif
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