Annotation of mandoc/compat_vasprintf.c, Revision 1.4
1.4 ! schwarze 1: /* $Id: compat_vasprintf.c,v 1.3 2015/10/06 18:32:19 schwarze Exp $ */
1.1 schwarze 2: /*
3: * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: *
17: * This fallback implementation is not efficient:
18: * It does the formatting twice.
19: * Short of fiddling with the unknown internals of the system's
20: * printf(3) or completely reimplementing printf(3), i can't think
21: * of another portable solution.
22: */
1.4 ! schwarze 23: #include "config.h"
1.1 schwarze 24:
25: #include <stdarg.h>
26: #include <stdio.h>
27: #include <stdlib.h>
28:
29: int
30: vasprintf(char **ret, const char *format, va_list ap)
31: {
32: char buf[2];
1.2 schwarze 33: va_list ap2;
1.1 schwarze 34: int sz;
35:
1.2 schwarze 36: va_copy(ap2, ap);
37: sz = vsnprintf(buf, sizeof(buf), format, ap2);
38: va_end(ap2);
39:
40: if (sz != -1 && (*ret = malloc(sz + 1)) != NULL) {
1.1 schwarze 41: if (vsnprintf(*ret, sz + 1, format, ap) == sz)
1.3 schwarze 42: return sz;
1.1 schwarze 43: free(*ret);
44: }
45: *ret = NULL;
1.3 schwarze 46: return -1;
1.1 schwarze 47: }
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