2 83f0f95a 2022-09-29 op * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
4 83f0f95a 2022-09-29 op * Permission to use, copy, modify, and distribute this software for any
5 83f0f95a 2022-09-29 op * purpose with or without fee is hereby granted, provided that the above
6 83f0f95a 2022-09-29 op * copyright notice and this permission notice appear in all copies.
8 83f0f95a 2022-09-29 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 83f0f95a 2022-09-29 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 83f0f95a 2022-09-29 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 83f0f95a 2022-09-29 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 83f0f95a 2022-09-29 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 83f0f95a 2022-09-29 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 83f0f95a 2022-09-29 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 83f0f95a 2022-09-29 op * This fallback implementation is not efficient:
17 83f0f95a 2022-09-29 op * It does the formatting twice.
18 83f0f95a 2022-09-29 op * Short of fiddling with the unknown internals of the system's
19 83f0f95a 2022-09-29 op * printf(3) or completely reimplementing printf(3), i can't think
20 83f0f95a 2022-09-29 op * of another portable solution.
23 83f0f95a 2022-09-29 op #include <stdarg.h>
24 83f0f95a 2022-09-29 op #include <stdio.h>
25 83f0f95a 2022-09-29 op #include <stdlib.h>
28 83f0f95a 2022-09-29 op vasprintf(char **ret, const char *format, va_list ap)
34 83f0f95a 2022-09-29 op va_copy(ap2, ap);
35 83f0f95a 2022-09-29 op sz = vsnprintf(buf, sizeof(buf), format, ap2);
38 83f0f95a 2022-09-29 op if (sz != -1 && (*ret = malloc(sz + 1)) != NULL) {
39 83f0f95a 2022-09-29 op if (vsnprintf(*ret, sz + 1, format, ap) == sz)