vswprintf.c revision 331722 
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 * Copyright (c) 2011 The FreeBSD Foundation
8 * All rights reserved.
9 * Portions of this software were developed by David Chisnall
10 * under sponsorship from the FreeBSD Foundation.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote products
21 *    derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
24 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
25 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
26 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
27 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
29 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
31 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
32 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#if 0
37__FBSDID("FreeBSD: src/lib/libc/stdio/vasprintf.c,v 1.16 2002/08/21 16:19:57 mike Exp ");
38#endif
39__FBSDID("$FreeBSD: stable/11/lib/libc/stdio/vswprintf.c 331722 2018-03-29 02:50:57Z eadler $");
40
41#include <errno.h>
42#include <limits.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <wchar.h>
46#include "local.h"
47#include "xlocale_private.h"
48
49int
50vswprintf_l(wchar_t * __restrict s, size_t n, locale_t locale,
51		const wchar_t * __restrict fmt, __va_list ap)
52{
53	static const mbstate_t initial;
54	mbstate_t mbs;
55	FILE f = FAKE_FILE;
56	char *mbp;
57	int ret, sverrno;
58	size_t nwc;
59	FIX_LOCALE(locale);
60
61	if (n == 0) {
62		errno = EINVAL;
63		return (-1);
64	}
65	if (n - 1 > INT_MAX) {
66		errno = EOVERFLOW;
67		*s = L'\0';
68		return (-1);
69	}
70
71	f._flags = __SWR | __SSTR | __SALC;
72	f._bf._base = f._p = (unsigned char *)malloc(128);
73	if (f._bf._base == NULL) {
74		errno = ENOMEM;
75		*s = L'\0';
76		return (-1);
77	}
78	f._bf._size = f._w = 127;		/* Leave room for the NUL */
79	ret = __vfwprintf(&f, locale, fmt, ap);
80	if (ret < 0) {
81		sverrno = errno;
82		free(f._bf._base);
83		errno = sverrno;
84		*s = L'\0';
85		return (-1);
86	}
87	*f._p = '\0';
88	mbp = f._bf._base;
89	/*
90	 * XXX Undo the conversion from wide characters to multibyte that
91	 * fputwc() did in __vfwprintf().
92	 */
93	mbs = initial;
94	nwc = mbsrtowcs_l(s, (const char **)&mbp, n, &mbs, locale);
95	free(f._bf._base);
96	if (nwc == (size_t)-1) {
97		errno = EILSEQ;
98		*s = L'\0';
99		return (-1);
100	}
101	if (nwc == n) {
102		s[n - 1] = L'\0';
103		errno = EOVERFLOW;
104		return (-1);
105	}
106
107	return (ret);
108}
109int
110vswprintf(wchar_t * __restrict s, size_t n, const wchar_t * __restrict fmt,
111    __va_list ap)
112{
113	return vswprintf_l(s, n, __get_locale(), fmt, ap);
114}
115