1 /* $OpenBSD: asprintf.c,v 1.22 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 <stdarg.h>
24 #include "local.h"
25
26 int
asprintf(char ** str,const char * fmt,...)27 asprintf(char **str, const char *fmt, ...)
28 {
29 int ret;
30 va_list ap;
31 FILE f;
32 struct __sfileext fext;
33 unsigned char *_base;
34
35 _FILEEXT_SETUP(&f, &fext);
36 f._file = -1;
37 f._flags = __SWR | __SSTR | __SALC;
38 f._bf._base = f._p = malloc(128);
39 if (f._bf._base == NULL)
40 goto err;
41 f._bf._size = f._w = 127; /* Leave room for the NUL */
42 va_start(ap, fmt);
43 ret = __vfprintf(&f, fmt, ap);
44 va_end(ap);
45 if (ret == -1)
46 goto err;
47 *f._p = '\0';
48 _base = realloc(f._bf._base, ret + 1);
49 if (_base == NULL)
50 goto err;
51 *str = (char *)_base;
52 return (ret);
53
54 err:
55 free(f._bf._base);
56 f._bf._base = NULL;
57 *str = NULL;
58 errno = ENOMEM;
59 return (-1);
60 }
61 DEF_WEAK(asprintf);
62