1 /* $OpenBSD: asprintf.c,v 1.8 2002/02/19 19:39:36 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 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <errno.h> 36 #include <stdarg.h> 37 38 #include "local.h" 39 40 int 41 asprintf(char **str, char const *fmt, ...) 42 { 43 int ret; 44 va_list ap; 45 FILE f; 46 47 f._file = -1; 48 f._flags = __SWR | __SSTR | __SALC; 49 f._bf._base = f._p = (unsigned char *)malloc(128); 50 if (f._bf._base == NULL) { 51 *str = NULL; 52 errno = ENOMEM; 53 return (-1); 54 } 55 f._bf._size = f._w = 127; /* Leave room for the NUL */ 56 f._orientation = 0; 57 memset(&f._mbstate, 0, sizeof(mbstate_t)); 58 va_start(ap, fmt); 59 ret = __vfprintf(&f, fmt, ap); /* Use unlocked __vfprintf */ 60 va_end(ap); 61 if (ret < 0) { 62 free(f._bf._base); 63 *str = NULL; 64 errno = ENOMEM; 65 return (-1); 66 } 67 *f._p = '\0'; 68 *str = (char *)f._bf._base; 69 return (ret); 70 } 71