1 /* $OpenBSD: vasprintf.c,v 1.19 2015/12/28 22:08:18 mmcc Exp $ */
2
3 /*
4 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@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 "local.h"
24
25 int
vasprintf(char ** str,const char * fmt,__va_list ap)26 vasprintf(char **str, const char *fmt, __va_list ap)
27 {
28 int ret;
29 FILE f;
30 struct __sfileext fext;
31 unsigned char *_base;
32
33 _FILEEXT_SETUP(&f, &fext);
34 f._file = -1;
35 f._flags = __SWR | __SSTR | __SALC;
36 f._bf._base = f._p = malloc(128);
37 if (f._bf._base == NULL)
38 goto err;
39 f._bf._size = f._w = 127; /* Leave room for the NUL */
40 ret = __vfprintf(&f, fmt, ap);
41 if (ret == -1)
42 goto err;
43 *f._p = '\0';
44 _base = realloc(f._bf._base, ret + 1);
45 if (_base == NULL)
46 goto err;
47 *str = (char *)_base;
48 return (ret);
49
50 err:
51 free(f._bf._base);
52 f._bf._base = NULL;
53 *str = NULL;
54 errno = ENOMEM;
55 return (-1);
56 }
57 DEF_WEAK(vasprintf);
58