1 /* $OpenBSD: asprintf.c,v 1.8 2002/02/19 19:39:36 millert Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Todd C. Miller <[email protected]> 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 struct __sFILEX ext; 47 unsigned char *_base; 48 49 va_start(ap, fmt); 50 f._file = -1; 51 f._flags = __SWR | __SSTR | __SALC; 52 f._bf._base = f._p = (unsigned char *)malloc(128); 53 if (f._bf._base == NULL) 54 goto err; 55 f._bf._size = f._w = 127; /* Leave room for the NUL */ 56 f._extra = &ext; 57 INITEXTRA(&f); 58 ret = __vfprintf(&f, fmt, ap); /* Use unlocked __vfprintf */ 59 if (ret == -1) 60 goto err; 61 *f._p = '\0'; 62 _base = realloc(f._bf._base, ret + 1); 63 if (_base == NULL) 64 goto err; 65 *str = (char *)_base; 66 va_end(ap); 67 return (ret); 68 69 err: 70 va_end(ap); 71 if (f._bf._base != NULL) { 72 free(f._bf._base); 73 f._bf._base = NULL; 74 } 75 *str = NULL; 76 errno = ENOMEM; 77 return (-1); 78 } 79