[apple/libc.git] / stdlib / OpenBSD / ecvt.c

/*	$OpenBSD: ecvt.c,v 1.7 2009/10/16 12:15:03 martynas Exp $	*/

/*
 * Copyright (c) 2002, 2006 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 THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
 *
 * Sponsored in part by the Defense Advanced Research Projects
 * Agency (DARPA) and Air Force Research Laboratory, Air Force
 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
 */

#include <sys/cdefs.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

extern char *__dtoa(double, int, int, int *, int *, char **);
extern void  __freedtoa(char *);
static char *__cvt(double, int, int *, int *, int, int);

static char *
__cvt(double value, int ndigit, int * __restrict decpt, int * __restrict sign, int fmode, int pad)
{
	static char *s;
	char *p, *rve, c;
	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 (p == NULL)
			return (NULL);
		if (*decpt == 9999) {
			/* Infinity or Nan, convert to inf or nan like printf */
			*decpt = 0;
			c = *p;
			__freedtoa(p);
			return(c == 'I' ? "inf" : "nan");
		}
		/* Make a local copy and adjust rve to be in terms of s */
		if (pad && fmode)
			siz += *decpt;
		if ((s = (char *)malloc(siz)) == NULL) {
			__freedtoa(p);
			return(NULL);
		}
		(void) strlcpy(s, p, siz);
		rve = s + (rve - p);
		__freedtoa(p);
	}

	/* Add trailing zeros */
	if (pad) {
		siz -= rve - s;
		while (--siz)
			*rve++ = '0';
		*rve = '\0';
	}

	return(s);
}

char *
ecvt(double value, int ndigit, int * __restrict decpt, int * __restrict sign)
{
	return(__cvt(value, ndigit, decpt, sign, 0, 1));
}

char *
fcvt(double value, int ndigit, int * __restrict decpt, int * __restrict sign)
{
	return(__cvt(value, ndigit, decpt, sign, 1, 1));
}
Commit	Line	Data
1f2f436a	1	/* $OpenBSD: ecvt.c,v 1.7 2009/10/16 12:15:03 martynas Exp $ */
3d9156a7 A	2
3d9156a7 A	3	/*
1f2f436a	4	* Copyright (c) 2002, 2006 Todd C. Miller <Todd.Miller@courtesan.com>
3d9156a7 A	5	*
	6	* Permission to use, copy, modify, and distribute this software for any
	7	* purpose with or without fee is hereby granted, provided that the above
	8	* copyright notice and this permission notice appear in all copies.
	9	*
	10	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	11	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	12	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	13	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	14	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	15	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	16	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	17	*
	18	* Sponsored in part by the Defense Advanced Research Projects
	19	* Agency (DARPA) and Air Force Research Laboratory, Air Force
	20	* Materiel Command, USAF, under agreement number F39502-99-1-0512.
	21	*/
	22
ad3c9f2a	23	#include <sys/cdefs.h>
3d9156a7 A	24	#include <stdio.h>
	25	#include <stdlib.h>
	26	#include <string.h>
	27
	28	extern char __dtoa(double, int, int, int , int , char *);
1f2f436a	29	extern void __freedtoa(char *);
3d9156a7 A	30	static char __cvt(double, int, int , int *, int, int);
	31
	32	static char *
ad3c9f2a	33	__cvt(double value, int ndigit, int * __restrict decpt, int * __restrict sign, int fmode, int pad)
3d9156a7 A	34	{
3d9156a7 A	35	static char *s;
1f2f436a	36	char p, rve, c;
3d9156a7 A	37	size_t siz;
	38
	39	if (ndigit == 0) {
	40	*sign = value < 0.0;
	41	*decpt = 0;
	42	return ("");
	43	}
	44
	45	if (s) {
	46	free(s);
	47	s = NULL;
	48	}
	49
	50	if (ndigit < 0)
	51	siz = -ndigit + 1;
	52	else
	53	siz = ndigit + 1;
	54
	55
	56	/* __dtoa() doesn't allocate space for 0 so we do it by hand */
	57	if (value == 0.0) {
	58	decpt = 1 - fmode; / 1 for 'e', 0 for 'f' */
	59	*sign = 0;
	60	if ((rve = s = (char *)malloc(siz)) == NULL)
	61	return(NULL);
	62	*rve++ = '0';
	63	*rve = '\0';
	64	} else {
	65	p = __dtoa(value, fmode + 2, ndigit, decpt, sign, &rve);
1f2f436a A	66	if (p == NULL)
1f2f436a A	67	return (NULL);
3d9156a7	68	if (*decpt == 9999) {
1f2f436a	69	/* Infinity or Nan, convert to inf or nan like printf */
3d9156a7	70	*decpt = 0;
1f2f436a A	71	c = *p;
	72	__freedtoa(p);
	73	return(c == 'I' ? "inf" : "nan");
3d9156a7	74	}
1f2f436a	75	/* Make a local copy and adjust rve to be in terms of s */
3d9156a7 A	76	if (pad && fmode)
3d9156a7 A	77	siz += *decpt;
1f2f436a A	78	if ((s = (char *)malloc(siz)) == NULL) {
1f2f436a A	79	__freedtoa(p);
3d9156a7	80	return(NULL);
1f2f436a	81	}
3d9156a7 A	82	(void) strlcpy(s, p, siz);
3d9156a7 A	83	rve = s + (rve - p);
1f2f436a	84	__freedtoa(p);
3d9156a7 A	85	}
3d9156a7 A	86
1f2f436a A	87	/* Add trailing zeros */
1f2f436a A	88	if (pad) {
3d9156a7 A	89	siz -= rve - s;
	90	while (--siz)
	91	*rve++ = '0';
	92	*rve = '\0';
	93	}
	94
	95	return(s);
	96	}
	97
	98	char *
ad3c9f2a	99	ecvt(double value, int ndigit, int * __restrict decpt, int * __restrict sign)
3d9156a7 A	100	{
	101	return(__cvt(value, ndigit, decpt, sign, 0, 1));
	102	}
	103
	104	char *
ad3c9f2a	105	fcvt(double value, int ndigit, int * __restrict decpt, int * __restrict sign)
3d9156a7 A	106	{
	107	return(__cvt(value, ndigit, decpt, sign, 1, 1));
	108	}