1/*	$OpenBSD: vswprintf.c,v 1.7 2019/01/25 00:19:25 millert Exp $	*/
2/*	$NetBSD: vswprintf.c,v 1.1 2005/05/14 23:51:02 christos Exp $	*/
3
4/*
5 * Copyright (c) 1997 Todd C. Miller <millert@openbsd.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
21 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
22 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
25 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <errno.h>
32#include <stdio.h>
33#include <stdlib.h>
34#include <string.h>
35#include <wchar.h>
36#include <stdarg.h>
37#include "local.h"
38
39int
40vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
41    __va_list ap)
42{
43	mbstate_t mbs;
44	FILE f;
45	char *mbp;
46	int ret, sverrno;
47	size_t nwc;
48	struct __sfileext fext;
49
50	if (n == 0) {
51		errno = EINVAL;
52		return (-1);
53	}
54
55	_FILEEXT_SETUP(&f, &fext);
56	f._file = -1;
57	f._flags = __SWR | __SSTR | __SALC;
58	f._bf._base = f._p = malloc(128);
59	if (f._bf._base == NULL) {
60		errno = ENOMEM;
61		return (-1);
62	}
63	f._bf._size = f._w = 127;		/* Leave room for the NUL */
64	ret = __vfwprintf(&f, fmt, ap);
65	if (ret < 0) {
66		sverrno = errno;
67		free(f._bf._base);
68		errno = sverrno;
69		return (-1);
70	}
71	if (ret == 0) {
72		s[0] = L'\0';
73		free(f._bf._base);
74		return (0);
75	}
76	*f._p = '\0';
77	mbp = (char *)f._bf._base;
78	/*
79	 * XXX Undo the conversion from wide characters to multibyte that
80	 * fputwc() did in __vfwprintf().
81	 */
82	bzero(&mbs, sizeof(mbs));
83	nwc = mbsrtowcs(s, (const char **)&mbp, n, &mbs);
84	free(f._bf._base);
85	if (nwc == (size_t)-1) {
86		errno = EILSEQ;
87		return (-1);
88	}
89	if (nwc == n) {
90		s[n - 1] = L'\0';
91		errno = EOVERFLOW;
92		return (-1);
93	}
94
95	return (ret);
96}
97DEF_STRONG(vswprintf);
98