2 * Copyright (c) 2004 Darren Tucker.
4 * Based originally on asprintf.c from OpenBSD:
5 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 #include "openbsd-compat.h"
25 #include <limits.h> /* for INT_MAX */
27 #include <stdio.h> /* for vsnprintf */
30 #define VA_COPY(dest, src) va_copy(dest, src)
35 vasprintf(char **str, const char *fmt, va_list ap)
39 char *string, *newstr;
42 if ((string = malloc(INIT_SZ)) == NULL)
46 ret = vsnprintf(string, INIT_SZ, fmt, ap2);
48 if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */
50 } else if (ret == INT_MAX || ret < 0) { /* Bad length */
53 } else { /* bigger than initial, realloc allowing for nul */
54 len = (size_t)ret + 1;
55 if ((newstr = realloc(string, len)) == NULL) {
60 ret = vsnprintf(newstr, len, fmt, ap2);
62 if (ret < 0 || (size_t)ret >= len) { /* failed with realloc'ed string */
76 int asprintf(char **str, const char *fmt, ...)
83 ret = vasprintf(str, fmt, ap);