1 /* $OpenBSD: asprintf.c,v 1.3 1998/02/07 20:51:21 tholo 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Todd C. Miller. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 22 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 23 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 24 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 27 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 28 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 29 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 30 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #if defined(LIBC_SCCS) && !defined(lint) 34 static char rcsid[] = "$OpenBSD: asprintf.c,v 1.3 1998/02/07 20:51:21 tholo Exp $"; 35 #endif /* LIBC_SCCS and not lint */ 36 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <errno.h> 40 #if __STDC__ 41 #include <stdarg.h> 42 #else 43 #include <varargs.h> 44 #endif 45 46 int 47 #if __STDC__ 48 asprintf(char **str, char const *fmt, ...) 49 #else 50 asprintf(str, fmt, va_alist) 51 char **str; 52 const char *fmt; 53 va_dcl 54 #endif 55 { 56 int ret; 57 va_list ap; 58 FILE f; 59 60 #if __STDC__ 61 va_start(ap, fmt); 62 #else 63 va_start(ap); 64 #endif 65 f._file = -1; 66 f._flags = __SWR | __SSTR | __SALC; 67 f._bf._base = f._p = (unsigned char *)malloc(128); 68 if (f._bf._base == NULL) { 69 *str = NULL; 70 errno = ENOMEM; 71 return (-1); 72 } 73 f._bf._size = f._w = 127; /* Leave room for the NULL */ 74 ret = vfprintf(&f, fmt, ap); 75 *f._p = '\0'; 76 va_end(ap); 77 f._bf._base = realloc(f._bf._base, f._bf._size + 1); 78 if (f._bf._base == NULL) { 79 errno = ENOMEM; 80 ret = -1; 81 } 82 *str = (char *)f._bf._base; 83 return (ret); 84 } 85