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 * All rights reserved.
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 <sys/cdefs.h>
38#if 0
39__FBSDID("FreeBSD: src/lib/libc/stdio/vasprintf.c,v 1.16 2002/08/21 16:19:57 mike Exp ");
40#endif
41__FBSDID("$FreeBSD$");
42
43#include <errno.h>
44#include <limits.h>
45#include <stdio.h>
46#include <stdlib.h>
47#include <wchar.h>
48#include "local.h"
49#include "xlocale_private.h"
50
51int
52vswprintf_l(wchar_t * __restrict s, size_t n, locale_t locale,
53		const wchar_t * __restrict fmt, __va_list ap)
54{
55	static const mbstate_t initial;
56	mbstate_t mbs;
57	FILE f = FAKE_FILE;
58	char *mbp;
59	int ret, sverrno;
60	size_t nwc;
61	FIX_LOCALE(locale);
62
63	if (n == 0) {
64		errno = EINVAL;
65		return (-1);
66	}
67	if (n - 1 > INT_MAX) {
68		errno = EOVERFLOW;
69		*s = L'\0';
70		return (-1);
71	}
72
73	f._flags = __SWR | __SSTR | __SALC;
74	f._bf._base = f._p = (unsigned char *)malloc(128);
75	if (f._bf._base == NULL) {
76		errno = ENOMEM;
77		*s = L'\0';
78		return (-1);
79	}
80	f._bf._size = f._w = 127;		/* Leave room for the NUL */
81	ret = __vfwprintf(&f, locale, fmt, ap);
82	if (ret < 0) {
83		sverrno = errno;
84		free(f._bf._base);
85		errno = sverrno;
86		*s = L'\0';
87		return (-1);
88	}
89	*f._p = '\0';
90	mbp = f._bf._base;
91	/*
92	 * XXX Undo the conversion from wide characters to multibyte that
93	 * fputwc() did in __vfwprintf().
94	 */
95	mbs = initial;
96	nwc = mbsrtowcs_l(s, (const char **)&mbp, n, &mbs, locale);
97	free(f._bf._base);
98	if (nwc == (size_t)-1) {
99		errno = EILSEQ;
100		*s = L'\0';
101		return (-1);
102	}
103	if (nwc == n) {
104		s[n - 1] = L'\0';
105		errno = EOVERFLOW;
106		return (-1);
107	}
108
109	return (ret);
110}
111int
112vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
113    __va_list ap)
114{
115	return vswprintf_l(s, n, __get_locale(), fmt, ap);
116}
117