1/*	$OpenBSD: vasprintf.c,v 1.4 1998/06/21 22:13:47 millert Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
7 * All rights reserved.
8 *
9 * Copyright (c) 2011 The FreeBSD Foundation
10 *
11 * Portions of this software were developed by David Chisnall
12 * under sponsorship from the FreeBSD Foundation.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 *    notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 *    notice, this list of conditions and the following disclaimer in the
21 *    documentation and/or other materials provided with the distribution.
22 * 3. The name of the author may not be used to endorse or promote products
23 *    derived from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
26 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
27 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
28 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
29 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <errno.h>
38#include <limits.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <wchar.h>
42#include "local.h"
43#include "xlocale_private.h"
44
45int
46vswprintf_l(wchar_t * __restrict s, size_t n, locale_t locale,
47		const wchar_t * __restrict fmt, __va_list ap)
48{
49	static const mbstate_t initial;
50	mbstate_t mbs;
51	FILE f = FAKE_FILE;
52	char *mbp;
53	int ret, sverrno;
54	size_t nwc;
55	FIX_LOCALE(locale);
56
57	if (n == 0) {
58		errno = EINVAL;
59		return (-1);
60	}
61	if (n - 1 > INT_MAX) {
62		errno = EOVERFLOW;
63		*s = L'\0';
64		return (-1);
65	}
66
67	f._flags = __SWR | __SSTR | __SALC;
68	f._bf._base = f._p = (unsigned char *)malloc(128);
69	if (f._bf._base == NULL) {
70		errno = ENOMEM;
71		*s = L'\0';
72		return (-1);
73	}
74	f._bf._size = f._w = 127;		/* Leave room for the NUL */
75	ret = __vfwprintf(&f, locale, fmt, ap);
76	if (ret < 0) {
77		sverrno = errno;
78		free(f._bf._base);
79		errno = sverrno;
80		*s = L'\0';
81		return (-1);
82	}
83	*f._p = '\0';
84	mbp = f._bf._base;
85	/*
86	 * XXX Undo the conversion from wide characters to multibyte that
87	 * fputwc() did in __vfwprintf().
88	 */
89	mbs = initial;
90	nwc = mbsrtowcs_l(s, (const char **)&mbp, n, &mbs, locale);
91	free(f._bf._base);
92	if (nwc == (size_t)-1) {
93		errno = EILSEQ;
94		*s = L'\0';
95		return (-1);
96	}
97	if (nwc == n) {
98		s[n - 1] = L'\0';
99		errno = EOVERFLOW;
100		return (-1);
101	}
102
103	return (ret);
104}
105int
106vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
107    __va_list ap)
108{
109	return vswprintf_l(s, n, __get_locale(), fmt, ap);
110}
111