asprintf.c (2574B)
1 /* $OpenBSD: asprintf.c,v 1.5 1998/08/14 21:39:39 deraadt 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_SCCS) && !defined(lint) 31 static char rcsid[] = "$OpenBSD: asprintf.c,v 1.5 1998/08/14 21:39:39 deraadt Exp $"; 32 #endif /* LIBC_SCCS 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 int 44 #if __STDC__ 45 asprintf(char **str, char const *fmt, ...) 46 #else 47 asprintf(str, fmt, va_alist) 48 char **str; 49 const char *fmt; 50 va_dcl 51 #endif 52 { 53 int ret; 54 va_list ap; 55 FILE f; 56 unsigned char *_base; 57 58 #if __STDC__ 59 va_start(ap, fmt); 60 #else 61 va_start(ap); 62 #endif 63 f._file = -1; 64 f._flags = __SWR | __SSTR | __SALC; 65 f._bf._base = f._p = (unsigned char *)malloc(128); 66 if (f._bf._base == NULL) { 67 *str = NULL; 68 errno = ENOMEM; 69 return (-1); 70 } 71 f._bf._size = f._w = 127; /* Leave room for the NULL */ 72 ret = vfprintf(&f, fmt, ap); 73 *f._p = '\0'; 74 va_end(ap); 75 _base = realloc(f._bf._base, f._bf._size + 1); 76 if (_base == NULL) { 77 errno = ENOMEM; 78 ret = -1; 79 } 80 f._bf._base = _base; 81 *str = (char *)f._bf._base; 82 return (ret); 83 }