[apple/libc.git] / stdio / FreeBSD / vsnprintf.c

/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * 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.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 sccsid[] = "@(#)vsnprintf.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/stdio/vsnprintf.c,v 1.24 2008/04/17 22:17:54 jhb Exp $");

#include "xlocale_private.h"

#include <limits.h>
#include <stdio.h>
#include "local.h"

__private_extern__ int
_vsnprintf(printf_comp_t __restrict pc, printf_domain_t __restrict domain, char * __restrict str, size_t n, locale_t __restrict loc, const char * __restrict fmt, __va_list ap)
{
	size_t on;
	int ret;
	char dummy[2];
	FILE f;
	struct __sFILEX ext;
	f._extra = &ext;
	INITEXTRA(&f);

	on = n;
	if (n != 0)
		n--;
#if defined(__i386__)
	/* <rdar://problem/16329527> don't corrupt the output buffer at all if the size underflowed */
	if (n > INT_MAX)
		on = n = 0;
#else
	if (n > INT_MAX)
		n = INT_MAX;
#endif

	/* Stdio internals do not deal correctly with zero length buffer */
	if (n == 0) {
		if (on > 0)
	  		*str = '\0';
		str = dummy;
		n = 1;
	}
	f._file = -1;
	f._flags = __SWR | __SSTR;
	f._bf._base = f._p = (unsigned char *)str;
	f._bf._size = f._w = n;
	f._orientation = 0;
	memset(&f._mbstate, 0, sizeof(mbstate_t));
	ret = __v2printf(pc, domain, &f, loc, fmt, ap);
	if (on > 0)
		*f._p = '\0';
	return (ret);
}
int
vsnprintf_l(char * __restrict str, size_t n, locale_t __restrict loc, const char * __restrict fmt,
    __va_list ap)
{
	return _vsnprintf(XPRINTF_PLAIN, NULL, str, n, loc, fmt, ap);
}

int
vsnprintf(char * __restrict str, size_t n, const char * __restrict fmt,
    __va_list ap)
{
	return _vsnprintf(XPRINTF_PLAIN, NULL, str, n, __current_locale(), fmt, ap);
}
Commit	Line	Data
5b2abdfb	1	/*-
e9ce8d39 A	2	* Copyright (c) 1990, 1993
	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* Chris Torek.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
e9ce8d39 A	16	* 4. Neither the name of the University nor the names of its contributors
	17	* may be used to endorse or promote products derived from this software
	18	* without specific prior written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	21	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	24	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	25	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	26	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	27	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	29	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	30	* SUCH DAMAGE.
	31	*/
	32
	33	#if defined(LIBC_SCCS) && !defined(lint)
9385eb3d	34	static char sccsid[] = "@(#)vsnprintf.c 8.1 (Berkeley) 6/4/93";
e9ce8d39	35	#endif /* LIBC_SCCS and not lint */
9385eb3d	36	#include <sys/cdefs.h>
1f2f436a	37	__FBSDID("$FreeBSD: src/lib/libc/stdio/vsnprintf.c,v 1.24 2008/04/17 22:17:54 jhb Exp $");
e9ce8d39	38
ad3c9f2a A	39	#include "xlocale_private.h"
ad3c9f2a A	40
9385eb3d	41	#include <limits.h>
e9ce8d39	42	#include <stdio.h>
9385eb3d	43	#include "local.h"
e9ce8d39	44
6465356a A	45	__private_extern__ int
6465356a A	46	_vsnprintf(printf_comp_t __restrict pc, printf_domain_t __restrict domain, char * __restrict str, size_t n, locale_t __restrict loc, const char * __restrict fmt, __va_list ap)
e9ce8d39	47	{
9385eb3d A	48	size_t on;
	49	int ret;
	50	char dummy[2];
	51	FILE f;
ad3c9f2a A	52	struct __sFILEX ext;
	53	f._extra = &ext;
	54	INITEXTRA(&f);
5b2abdfb	55
9385eb3d A	56	on = n;
	57	if (n != 0)
	58	n--;
23e20b00 A	59	#if defined(__i386__)
	60	/* <rdar://problem/16329527> don't corrupt the output buffer at all if the size underflowed */
	61	if (n > INT_MAX)
	62	on = n = 0;
	63	#else
9385eb3d A	64	if (n > INT_MAX)
9385eb3d A	65	n = INT_MAX;
23e20b00 A	66	#endif
23e20b00 A	67
9385eb3d A	68	/* Stdio internals do not deal correctly with zero length buffer */
	69	if (n == 0) {
	70	if (on > 0)
	71	*str = '\0';
	72	str = dummy;
	73	n = 1;
	74	}
	75	f._file = -1;
	76	f._flags = __SWR \| __SSTR;
	77	f._bf._base = f._p = (unsigned char *)str;
	78	f._bf._size = f._w = n;
1f2f436a A	79	f._orientation = 0;
1f2f436a A	80	memset(&f._mbstate, 0, sizeof(mbstate_t));
6465356a	81	ret = __v2printf(pc, domain, &f, loc, fmt, ap);
9385eb3d A	82	if (on > 0)
	83	*f._p = '\0';
	84	return (ret);
e9ce8d39	85	}
6465356a A	86	int
	87	vsnprintf_l(char * __restrict str, size_t n, locale_t __restrict loc, const char * __restrict fmt,
	88	__va_list ap)
	89	{
	90	return _vsnprintf(XPRINTF_PLAIN, NULL, str, n, loc, fmt, ap);
	91	}
ad3c9f2a A	92
	93	int
	94	vsnprintf(char * __restrict str, size_t n, const char * __restrict fmt,
	95	__va_list ap)
	96	{
6465356a	97	return _vsnprintf(XPRINTF_PLAIN, NULL, str, n, __current_locale(), fmt, ap);
ad3c9f2a	98	}