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/* $OpenBSD: ecvt.c,v 1.2 2003/06/03 01:52:40 millert Exp $ */
/*
* Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND TODD C. MILLER DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL TODD C. MILLER BE LIABLE
* FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$OpenBSD: ecvt.c,v 1.2 2003/06/03 01:52:40 millert Exp $";
#endif /* LIBC_SCCS and not lint */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
extern char *__dtoa(double, int, int, int *, int *, char **);
static char *__cvt(double, int, int *, int *, int, int);
static char *
__cvt(double value, int ndigit, int *decpt, int *sign, int fmode, int pad)
{
static char *s;
char *p, *rve;
size_t siz;
if (ndigit == 0) {
*sign = value < 0.0;
*decpt = 0;
return ("");
}
if (s) {
free(s);
s = NULL;
}
if (ndigit < 0)
siz = -ndigit + 1;
else
siz = ndigit + 1;
/* __dtoa() doesn't allocate space for 0 so we do it by hand */
if (value == 0.0) {
*decpt = 1 - fmode; /* 1 for 'e', 0 for 'f' */
*sign = 0;
if ((rve = s = (char *)malloc(siz)) == NULL)
return(NULL);
*rve++ = '0';
*rve = '\0';
} else {
p = __dtoa(value, fmode + 2, ndigit, decpt, sign, &rve);
if (*decpt == 9999) {
/* Nan or Infinity */
*decpt = 0;
return(p);
}
/* make a local copy and adjust rve to be in terms of s */
if (pad && fmode)
siz += *decpt;
if ((s = (char *)malloc(siz)) == NULL)
return(NULL);
(void) strlcpy(s, p, siz);
rve = s + (rve - p);
}
/* Add trailing zeros (unless we got NaN or Inf) */
if (pad && *decpt != 9999) {
siz -= rve - s;
while (--siz)
*rve++ = '0';
*rve = '\0';
}
return(s);
}
char *
ecvt(double value, int ndigit, int *decpt, int *sign)
{
return(__cvt(value, ndigit, decpt, sign, 0, 1));
}
char *
fcvt(double value, int ndigit, int *decpt, int *sign)
{
return(__cvt(value, ndigit, decpt, sign, 1, 1));
}
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