1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2002-2004 Tim J. Robbins.
5 * All rights reserved.
6 *
7 * Copyright (c) 2011 The FreeBSD Foundation
8 *
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 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include "namespace.h"
35 #include <errno.h>
36 #include <stdio.h>
37 #include <string.h>
38 #include <wchar.h>
39 #include "un-namespace.h"
40 #include "libc_private.h"
41 #include "local.h"
42 #include "mblocal.h"
43
44 wchar_t *
fgetws_l(wchar_t * __restrict ws,int n,FILE * __restrict fp,locale_t locale)45 fgetws_l(wchar_t * __restrict ws, int n, FILE * __restrict fp, locale_t locale)
46 {
47 int sret;
48 wchar_t *wsp, *ret;
49 size_t nconv;
50 const char *src;
51 unsigned char *nl;
52 FIX_LOCALE(locale);
53 struct xlocale_ctype *l = XLOCALE_CTYPE(locale);
54
55 FLOCKFILE_CANCELSAFE(fp);
56 ORIENT(fp, 1);
57
58 if (n <= 0) {
59 fp->_flags |= __SERR;
60 errno = EINVAL;
61 goto error;
62 }
63
64 wsp = ws;
65 if (n == 1)
66 goto ok;
67
68 if (fp->_r <= 0 && __srefill(fp))
69 /* EOF or ferror */
70 goto error;
71
72 sret = 0;
73 do {
74 src = fp->_p;
75 nl = memchr(fp->_p, '\n', fp->_r);
76 nconv = l->__mbsnrtowcs(wsp, &src,
77 nl != NULL ? (nl - fp->_p + 1) : fp->_r,
78 n - 1, &fp->_mbstate);
79 if (nconv == (size_t)-1) {
80 /* Conversion error */
81 fp->_flags |= __SERR;
82 goto error;
83 }
84 if (src == NULL) {
85 /*
86 * We hit a null byte. Increment the character count,
87 * since mbsnrtowcs()'s return value doesn't include
88 * the terminating null, then resume conversion
89 * after the null.
90 */
91 nconv++;
92 src = memchr(fp->_p, '\0', fp->_r);
93 src++;
94 }
95 fp->_r -= (unsigned char *)src - fp->_p;
96 fp->_p = (unsigned char *)src;
97 n -= nconv;
98 wsp += nconv;
99 } while ((wsp == ws || wsp[-1] != L'\n') && n > 1 && (fp->_r > 0 ||
100 (sret = __srefill(fp)) == 0));
101 if (sret && !__sfeof(fp))
102 /* ferror */
103 goto error;
104 if (!l->__mbsinit(&fp->_mbstate)) {
105 /* Incomplete character */
106 fp->_flags |= __SERR;
107 errno = EILSEQ;
108 goto error;
109 }
110 if (wsp == ws)
111 /* EOF */
112 goto error;
113 ok:
114 *wsp = L'\0';
115 ret = ws;
116 end:
117 FUNLOCKFILE_CANCELSAFE();
118 return (ret);
119
120 error:
121 ret = NULL;
122 goto end;
123 }
124
125 wchar_t *
fgetws(wchar_t * __restrict ws,int n,FILE * __restrict fp)126 fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp)
127 {
128 return fgetws_l(ws, n, fp, __get_locale());
129 }
130