1 /* $NetBSD: vasprintf.c,v 1.17 2013/05/19 21:45:00 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@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 1.17 2013/05/19 21:45:00 christos 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 = 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