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/* $OpenBSD: ecvt.c,v 1.1 2002/12/02 15:38:54 millert Exp $ */
/*
* Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$OpenBSD: ecvt.c,v 1.1 2002/12/02 15:38:54 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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