1 /* $OpenBSD: vasprintf.c,v 1.4 1998/06/21 22:13:47 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 * $FreeBSD: src/lib/libc/stdio/vasprintf.c,v 1.19 2008/04/17 22:17:54 jhb Exp $ 30 * $DragonFly: src/lib/libc/stdio/vasprintf.c,v 1.8 2006/03/02 18:05:30 joerg Exp $ 31 */ 32 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <errno.h> 36 #include "local.h" 37 #include "priv_stdio.h" 38 39 int 40 vasprintf(char **str, const char *fmt, __va_list ap) 41 { 42 int ret; 43 FILE f; 44 45 f.pub._fileno = -1; 46 f.pub._flags = __SWR | __SSTR | __SALC; 47 f._bf._base = f.pub._p = (unsigned char *)malloc(128); 48 if (f._bf._base == NULL) { 49 *str = NULL; 50 errno = ENOMEM; 51 return (-1); 52 } 53 f._bf._size = f.pub._w = 127; /* Leave room for the NUL */ 54 memset(WCIO_GET(&f), 0, sizeof(struct wchar_io_data)); 55 ret = __vfprintf(&f, fmt, ap); 56 if (ret < 0) { 57 free(f._bf._base); 58 *str = NULL; 59 errno = ENOMEM; 60 return (-1); 61 } 62 *f.pub._p = '\0'; 63 *str = (char *)f._bf._base; 64 return (ret); 65 } 66