vswprintf.c revision 108867 
1/*	$OpenBSD: vasprintf.c,v 1.4 1998/06/21 22:13:47 millert Exp $	*/
2
3/*
4 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31#if 0
32__FBSDID("FreeBSD: src/lib/libc/stdio/vasprintf.c,v 1.16 2002/08/21 16:19:57 mike Exp ");
33#endif
34__FBSDID("$FreeBSD: head/lib/libc/stdio/vswprintf.c 108867 2003-01-07 06:20:47Z tjr $");
35
36#include <errno.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <wchar.h>
40#include "local.h"
41
42int
43vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
44    __va_list ap)
45{
46	FILE f;
47	struct __sFILEX ext;
48	mbstate_t mbs;
49	char *mbp;
50	int ret, sverrno;
51
52	if (n == 0) {
53		errno = EINVAL;
54		return (-1);
55	}
56
57	f._file = -1;
58	f._flags = __SWR | __SSTR | __SALC;
59	f._bf._base = f._p = (unsigned char *)malloc(128);
60	if (f._bf._base == NULL) {
61		errno = ENOMEM;
62		return (-1);
63	}
64	f._bf._size = f._w = 127;		/* Leave room for the NUL */
65	f._extra = &ext;
66	INITEXTRA(&f);
67	ret = __vfwprintf(&f, fmt, ap);
68	if (ret < 0) {
69		sverrno = errno;
70		free(f._bf._base);
71		errno = sverrno;
72		return (-1);
73	}
74	*f._p = '\0';
75	mbp = f._bf._base;
76	memset(&mbs, 0, sizeof(mbs));
77	/*
78	 * XXX Undo the conversion from wide characters to multibyte that
79	 * fputwc() did in __vfwprintf().
80	 */
81	if (mbsrtowcs(s, (const char **)&mbp, n, &mbs) == (size_t)-1) {
82		free(f._bf._base);
83		errno = EILSEQ;
84		return (-1);
85	}
86	free(f._bf._base);
87	if (s[n - 1] != L'\0') {
88		s[n - 1] = L'\0';
89		errno = EOVERFLOW;
90		return (-1);
91	}
92
93	return (ret);
94}
95