[apple/libc.git] / stdlib / ecvt-obsd.c

/*	$OpenBSD: ecvt.c,v 1.3 2003/06/17 21:56:24 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 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>
#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$OpenBSD: ecvt.c,v 1.3 2003/06/17 21:56:24 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 **);
extern void __freedtoa(char *); /* special gdtoa free function */
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;
	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;
			rve = (*p == 'N') ? "nan" : "inf";
			__freedtoa(p);
			return(rve);
		}
		/* 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 (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 * __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
224c7076 A	1	/* $OpenBSD: ecvt.c,v 1.3 2003/06/17 21:56:24 millert Exp $ */
	2
	3	/*
	4	* Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com>
	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
	23	#include <sys/cdefs.h>
	24	#if defined(LIBC_SCCS) && !defined(lint)
	25	static char rcsid[] = "$OpenBSD: ecvt.c,v 1.3 2003/06/17 21:56:24 millert Exp $";
	26	#endif /* LIBC_SCCS and not lint */
	27
	28	#include <stdio.h>
	29	#include <stdlib.h>
	30	#include <string.h>
	31
	32	extern char __dtoa(double, int, int, int , int , char *);
	33	extern void __freedtoa(char ); / special gdtoa free function */
	34	static char __cvt(double, int, int , int *, int, int);
	35
	36	static char *
	37	__cvt(double value, int ndigit, int * __restrict decpt, int * __restrict sign, int fmode, int pad)
	38	{
	39	static char *s;
	40	char p, rve;
	41	size_t siz;
	42
	43	if (ndigit == 0) {
	44	*sign = value < 0.0;
	45	*decpt = 0;
	46	return ("");
	47	}
	48
	49	if (s) {
	50	free(s);
	51	s = NULL;
	52	}
	53
	54	if (ndigit < 0)
	55	siz = -ndigit + 1;
	56	else
	57	siz = ndigit + 1;
	58
	59
	60	/* __dtoa() doesn't allocate space for 0 so we do it by hand */
	61	if (value == 0.0) {
	62	decpt = 1 - fmode; / 1 for 'e', 0 for 'f' */
	63	*sign = 0;
	64	if ((rve = s = (char *)malloc(siz)) == NULL)
65	return(NULL);
66	*rve++ = '0';
67	*rve = '\0';
68	} else {
69	p = __dtoa(value, fmode + 2, ndigit, decpt, sign, &rve);
70	if (*decpt == 9999) {
71	/* Nan or Infinity */
72	*decpt = 0;
73	rve = (*p == 'N') ? "nan" : "inf";
74	__freedtoa(p);
75	return(rve);
76	}
77	/* make a local copy and adjust rve to be in terms of s */
78	if (pad && fmode)
79	siz += *decpt;
80	if ((s = (char *)malloc(siz)) == NULL) {
81	__freedtoa(p);
82	return(NULL);
83	}
84	(void) strlcpy(s, p, siz);
85	rve = s + (rve - p);
86	__freedtoa(p);
87	}
88
89	/* Add trailing zeros (unless we got NaN or Inf) */
90	if (pad && *decpt != 9999) {
91	siz -= rve - s;
92	while (--siz)
93	*rve++ = '0';
94	*rve = '\0';
95	}
96
97	return(s);
98	}
99
100	char *
101	ecvt(double value, int ndigit, int * __restrict decpt, int * __restrict sign)
102	{
103	return(__cvt(value, ndigit, decpt, sign, 0, 1));
104	}
105
106	char *
107	fcvt(double value, int ndigit, int * __restrict decpt, int * __restrict sign)
108	{
109	return(__cvt(value, ndigit, decpt, sign, 1, 1));
110	}