1 /* $OpenBSD: asprintf.c,v 1.18 2009/11/09 00:18:27 kurt 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 #include <stdio.h> 20 #include <stdlib.h> 21 #include <string.h> 22 #include <errno.h> 23 #include <stdarg.h> 24 #include "local.h" 25 26 int 27 asprintf(char **str, const char *fmt, ...) 28 { 29 int ret; 30 va_list ap; 31 FILE f; 32 struct __sfileext fext; 33 unsigned char *_base; 34 35 _FILEEXT_SETUP(&f, &fext); 36 f._file = -1; 37 f._flags = __SWR | __SSTR | __SALC; 38 f._bf._base = f._p = (unsigned char *)malloc(128); 39 if (f._bf._base == NULL) 40 goto err; 41 f._bf._size = f._w = 127; /* Leave room for the NUL */ 42 va_start(ap, fmt); 43 ret = __vfprintf(&f, fmt, ap); 44 va_end(ap); 45 if (ret == -1) 46 goto err; 47 *f._p = '\0'; 48 _base = realloc(f._bf._base, ret + 1); 49 if (_base == NULL) 50 goto err; 51 *str = (char *)_base; 52 return (ret); 53 54 err: 55 if (f._bf._base) { 56 free(f._bf._base); 57 f._bf._base = NULL; 58 } 59 *str = NULL; 60 errno = ENOMEM; 61 return (-1); 62 } 63