1 /* $OpenBSD: asprintf.c,v 1.12 2005/04/30 09:25:17 espie Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #if defined(LIBC_SCCS) && !defined(lint) 20 static char rcsid[] = "$OpenBSD: asprintf.c,v 1.12 2005/04/30 09:25:17 espie Exp $"; 21 #endif /* LIBC_SCCS and not lint */ 22 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <errno.h> 26 #include <stdarg.h> 27 #include "local.h" 28 29 int 30 asprintf(char **str, const char *fmt, ...) 31 { 32 int ret; 33 va_list ap; 34 FILE f; 35 struct __sfileext fext; 36 unsigned char *_base; 37 38 _FILEEXT_SETUP(&f, &fext); 39 va_start(ap, fmt); 40 f._file = -1; 41 f._flags = __SWR | __SSTR | __SALC; 42 f._bf._base = f._p = (unsigned char *)malloc(128); 43 if (f._bf._base == NULL) 44 goto err; 45 f._bf._size = f._w = 127; /* Leave room for the NUL */ 46 ret = vfprintf(&f, fmt, ap); 47 if (ret == -1) 48 goto err; 49 *f._p = '\0'; 50 _base = realloc(f._bf._base, ret + 1); 51 if (_base == NULL) 52 goto err; 53 *str = (char *)_base; 54 va_end(ap); 55 return (ret); 56 57 err: 58 va_end(ap); 59 if (f._bf._base) { 60 free(f._bf._base); 61 f._bf._base = NULL; 62 } 63 *str = NULL; 64 errno = ENOMEM; 65 return (-1); 66 } 67