Home | History | Annotate | Line # | Download | only in stdio
vsnprintf.c revision 1.27 
      1 /*	$NetBSD: vsnprintf.c,v 1.27 2013/05/17 12:55:57 joerg Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Chris Torek.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)vsnprintf.c	8.1 (Berkeley) 6/4/93";
     39 #else
     40 __RCSID("$NetBSD: vsnprintf.c,v 1.27 2013/05/17 12:55:57 joerg Exp $");
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include "namespace.h"
     45 
     46 #include <assert.h>
     47 #include <errno.h>
     48 #include <locale.h>
     49 #include <stdio.h>
     50 #include "reentrant.h"
     51 #include "setlocale_local.h"
     52 #include "local.h"
     53 
     54 #if defined(_FORTIFY_SOURCE) && !defined(__lint__)
     55 #undef vsnprintf
     56 #define vsnprintf _vsnprintf
     57 #undef snprintf
     58 #define snprintf _snprintf
     59 #endif
     60 
     61 #ifdef __weak_alias
     62 __weak_alias(vsnprintf,_vsnprintf)
     63 __weak_alias(vsnprintf_l,_vsnprintf_l)
     64 __weak_alias(snprintf,_snprintf)
     65 __weak_alias(snprintf_l,_snprintf_l)
     66 #endif
     67 
     68 int
     69 vsnprintf_l(char *str, size_t n, locale_t loc, const char *fmt, va_list ap)
     70 {
     71 	int ret;
     72 	FILE f;
     73 	struct __sfileext fext;
     74 	unsigned char dummy[1];
     75 
     76 	_DIAGASSERT(n == 0 || str != NULL);
     77 	_DIAGASSERT(fmt != NULL);
     78 
     79 	if ((int)n < 0) {
     80 		errno = EINVAL;
     81 		return -1;
     82 	}
     83 
     84 	_FILEEXT_SETUP(&f, &fext);
     85 	f._file = -1;
     86 	f._flags = __SWR | __SSTR;
     87 	if (n == 0) {
     88 		f._bf._base = f._p = dummy;
     89 		f._bf._size = f._w = 0;
     90 	} else {
     91 		f._bf._base = f._p = (unsigned char *)str;
     92 		_DIAGASSERT(__type_fit(int, n - 1));
     93 		f._bf._size = f._w = (int)(n - 1);
     94 	}
     95 	ret = __vfprintf_unlocked_l(&f, loc, fmt, ap);
     96 	*f._p = 0;
     97 	return ret;
     98 }
     99 
    100 int
    101 vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
    102 {
    103 	return vsnprintf_l(str, n, _current_locale(), fmt, ap);
    104 }
    105 
    106 int
    107 snprintf(char *str, size_t n, const char *fmt, ...)
    108 {
    109 	va_list ap;
    110 	int ret;
    111 
    112 	va_start(ap, fmt);
    113 	ret = vsnprintf(str, n, fmt, ap);
    114 	va_end(ap);
    115 	return ret;
    116 }
    117 
    118 int
    119 snprintf_l(char *str, size_t n, locale_t loc, const char *fmt, ...)
    120 {
    121 	va_list ap;
    122 	int ret;
    123 
    124 	va_start(ap, fmt);
    125 	ret = vsnprintf_l(str, n, loc, fmt, ap);
    126 	va_end(ap);
    127 	return ret;
    128 }
    129