1 /* $NetBSD: vasprintf.c,v 1.8 2001/12/07 11:47:44 yamt 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 1.8 2001/12/07 11:47:44 yamt Exp $"); 33 #endif /* LIBC_SCCS and not lint */ 34 35 #include <assert.h> 36 #include <errno.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include "local.h" 40 41 int 42 vasprintf(str, fmt, ap) 43 char **str; 44 const char *fmt; 45 _BSD_VA_LIST_ ap; 46 { 47 int ret; 48 FILE f; 49 struct __sfileext fext; 50 unsigned char *_base; 51 52 _DIAGASSERT(str != NULL); 53 _DIAGASSERT(fmt != NULL); 54 55 _FILEEXT_SETUP(&f, &fext); 56 f._file = -1; 57 f._flags = __SWR | __SSTR | __SALC; 58 f._bf._base = f._p = (unsigned char *)malloc(128); 59 if (f._bf._base == NULL) 60 goto err; 61 f._bf._size = f._w = 127; /* Leave room for the NUL */ 62 ret = vfprintf(&f, fmt, ap); 63 if (ret == -1) 64 goto err; 65 *f._p = '\0'; 66 _base = realloc(f._bf._base, (size_t)(ret + 1)); 67 if (_base == NULL) 68 goto err; 69 *str = (char *)_base; 70 return (ret); 71 72 err: 73 if (f._bf._base) 74 free(f._bf._base); 75 *str = NULL; 76 errno = ENOMEM; 77 return (-1); 78 } 79