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.
22 #ifndef HAVE_VASPRINTF
26 # define VA_COPY(dest, src) va_copy(dest, src)
28 # ifdef HAVE___VA_COPY
29 # define VA_COPY(dest, src) __va_copy(dest, src)
31 # define VA_COPY(dest, src) (dest) = (src)
38 int vasprintf(char **str, const char *fmt, va_list ap)
42 char *string, *newstr;
46 if ((string = malloc(INIT_SZ)) == NULL)
49 ret = vsnprintf(string, INIT_SZ, fmt, ap2);
50 if (ret >= 0 && ret < INIT_SZ) { /* succeeded with initial alloc */
52 } else if (ret == INT_MAX) { /* shouldn't happen */
54 } else { /* bigger than initial, realloc allowing for nul */
55 len = (size_t)ret + 1;
56 if ((newstr = realloc(string, len)) == NULL) {
62 ret = vsnprintf(newstr, len, fmt, ap2);
63 if (ret >= 0 && (size_t)ret < len) {
65 } else { /* failed with realloc'ed string, give up */
83 int asprintf(char **str, const char *fmt, ...)
90 ret = vasprintf(str, fmt, ap);