1 /* $OpenBSD: asprintf.c,v 1.4 1998/06/21 22:13:46 millert 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 * $FreeBSD: src/lib/libc/stdio/asprintf.c,v 1.6 1999/08/28 00:00:55 peter Exp $ 30 * $DragonFly: src/lib/libc/stdio/asprintf.c,v 1.2 2003/06/17 04:26:45 dillon Exp $ 31 */ 32 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <errno.h> 36 #if __STDC__ 37 #include <stdarg.h> 38 #else 39 #include <varargs.h> 40 #endif 41 42 int 43 #if __STDC__ 44 asprintf(char **str, char const *fmt, ...) 45 #else 46 asprintf(str, fmt, va_alist) 47 char **str; 48 const char *fmt; 49 va_dcl 50 #endif 51 { 52 int ret; 53 va_list ap; 54 FILE f; 55 56 #if __STDC__ 57 va_start(ap, fmt); 58 #else 59 va_start(ap); 60 #endif 61 f._file = -1; 62 f._flags = __SWR | __SSTR | __SALC; 63 f._bf._base = f._p = (unsigned char *)malloc(128); 64 if (f._bf._base == NULL) { 65 *str = NULL; 66 errno = ENOMEM; 67 return (-1); 68 } 69 f._bf._size = f._w = 127; /* Leave room for the NULL */ 70 ret = vfprintf(&f, fmt, ap); 71 *f._p = '\0'; 72 va_end(ap); 73 f._bf._base = reallocf(f._bf._base, f._bf._size + 1); 74 if (f._bf._base == NULL) { 75 errno = ENOMEM; 76 ret = -1; 77 } 78 *str = (char *)f._bf._base; 79 return (ret); 80 } 81