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 30 #if defined(LIBC_RCS) && !defined(lint) 31 static char rcsid[] = "$FreeBSD$"; 32 #endif /* LIBC_RCS and not lint */ 33 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <errno.h> 37 #if __STDC__ 38 #include <stdarg.h> 39 #else 40 #include <varargs.h> 41 #endif 42 43 #include "local.h" 44 45 int 46 #if __STDC__ 47 asprintf(char **str, char const *fmt, ...) 48 #else 49 asprintf(str, fmt, va_alist) 50 char **str; 51 const char *fmt; 52 va_dcl 53 #endif 54 { 55 int ret; 56 va_list ap; 57 FILE f; 58 59 #if __STDC__ 60 va_start(ap, fmt); 61 #else 62 va_start(ap); 63 #endif 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 *str = NULL; 69 errno = ENOMEM; 70 return (-1); 71 } 72 f._bf._size = f._w = 127; /* Leave room for the NULL */ 73 ret = __vfprintf(&f, fmt, ap); /* Use unlocked __vfprintf */ 74 *f._p = '\0'; 75 va_end(ap); 76 f._bf._base = reallocf(f._bf._base, f._bf._size + 1); 77 if (f._bf._base == NULL) { 78 errno = ENOMEM; 79 ret = -1; 80 } 81 *str = (char *)f._bf._base; 82 return (ret); 83 } 84