1 /* $OpenBSD: asprintf.c,v 1.15 2005/10/10 12:00:52 espie Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Todd C. Miller <Todd.Miller (at) 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 unsigned char *_base; 33 34 f._file = -1; 35 f._flags = __SWR | __SSTR | __SALC; 36 f._bf._base = f._p = (unsigned char *)malloc(128); 37 if (f._bf._base == NULL) 38 goto err; 39 f._bf._size = f._w = 127; /* Leave room for the NUL */ 40 va_start(ap, fmt); 41 ret = __vfprintf(&f, fmt, ap); 42 va_end(ap); 43 if (ret == -1) 44 goto err; 45 *f._p = '\0'; 46 _base = realloc(f._bf._base, ret + 1); 47 if (_base == NULL) 48 goto err; 49 *str = (char *)_base; 50 return (ret); 51 52 err: 53 free(f._bf._base); 54 *str = NULL; 55 errno = ENOMEM; 56 return (-1); 57 } 58
