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vasprintf.c revision 1.15 
      1 /*	$NetBSD: vasprintf.c,v 1.15 2013/04/19 15:22:25 joerg Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997 Todd C. Miller <Todd.Miller (at) courtesan.com>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
     19  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
     20  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
     21  * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     24  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     27  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 #if defined(LIBC_SCCS) && !defined(lint)
     32 __RCSID("$NetBSD: vasprintf.c,v 1.15 2013/04/19 15:22:25 joerg Exp $");
     33 #endif /* LIBC_SCCS and not lint */
     34 
     35 #include "namespace.h"
     36 
     37 #include <assert.h>
     38 #include <errno.h>
     39 #include <locale.h>
     40 #include <stdio.h>
     41 #include <stdlib.h>
     42 
     43 #include "reentrant.h"
     44 #include "setlocale_local.h"
     45 #include "local.h"
     46 
     47 __weak_alias(asprintf, _asprintf)
     48 __weak_alias(asprintf_l, _asprintf_l)
     49 __weak_alias(vasprintf, _vasprintf)
     50 __weak_alias(vasprintf_l, _vasprintf_l)
     51 
     52 int
     53 vasprintf_l(char **str, locale_t loc, const char *fmt, va_list ap)
     54 {
     55 	int ret;
     56 	FILE f;
     57 	struct __sfileext fext;
     58 	unsigned char *_base;
     59 
     60 	_DIAGASSERT(str != NULL);
     61 	_DIAGASSERT(fmt != NULL);
     62 
     63 	_FILEEXT_SETUP(&f, &fext);
     64 	f._file = -1;
     65 	f._flags = __SWR | __SSTR | __SALC;
     66 	f._bf._base = f._p = (unsigned char *)malloc(128);
     67 	if (f._bf._base == NULL)
     68 		goto err;
     69 	f._bf._size = f._w = 127;		/* Leave room for the NUL */
     70 	ret = __vfprintf_unlocked_l(&f, loc, fmt, ap);
     71 	if (ret == -1)
     72 		goto err;
     73 	*f._p = '\0';
     74 	_base = realloc(f._bf._base, (size_t)(ret + 1));
     75 	if (_base == NULL)
     76 		goto err;
     77 	*str = (char *)_base;
     78 	return ret;
     79 
     80 err:
     81 	if (f._bf._base)
     82 		free(f._bf._base);
     83 	*str = NULL;
     84 	errno = ENOMEM;
     85 	return -1;
     86 }
     87 
     88 int
     89 vasprintf(char **str, const char *fmt, va_list ap)
     90 {
     91 	return vasprintf_l(str, *_current_locale(), fmt, ap);
     92 }
     93 
     94 int
     95 asprintf_l(char **str, locale_t loc, char const *fmt, ...)
     96 {
     97 	va_list ap;
     98 	int ret;
     99 
    100 	va_start(ap, fmt);
    101 	ret = vasprintf_l(str, loc, fmt, ap);
    102 	va_end(ap);
    103 	return ret;
    104 }
    105 
    106 int
    107 asprintf(char **str, char const *fmt, ...)
    108 {
    109 	va_list ap;
    110 	int ret;
    111 
    112 	va_start(ap, fmt);
    113 	ret = vasprintf(str, fmt, ap);
    114 	va_end(ap);
    115 	return ret;
    116 }
    117