1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2002-2004 Tim J. Robbins.
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 *
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 <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36
37 #include "namespace.h"
38 #include <errno.h>
39 #include <stdio.h>
40 #include <string.h>
41 #include <wchar.h>
42 #include "un-namespace.h"
43 #include "libc_private.h"
44 #include "local.h"
45 #include "mblocal.h"
46
47 wchar_t *
fgetws_l(wchar_t * __restrict ws,int n,FILE * __restrict fp,locale_t locale)48 fgetws_l(wchar_t * __restrict ws, int n, FILE * __restrict fp, locale_t locale)
49 {
50 int sret;
51 wchar_t *wsp, *ret;
52 size_t nconv;
53 const char *src;
54 unsigned char *nl;
55 FIX_LOCALE(locale);
56 struct xlocale_ctype *l = XLOCALE_CTYPE(locale);
57
58 FLOCKFILE_CANCELSAFE(fp);
59 ORIENT(fp, 1);
60
61 if (n <= 0) {
62 fp->_flags |= __SERR;
63 errno = EINVAL;
64 goto error;
65 }
66
67 wsp = ws;
68 if (n == 1)
69 goto ok;
70
71 if (fp->_r <= 0 && __srefill(fp))
72 /* EOF or ferror */
73 goto error;
74
75 sret = 0;
76 do {
77 src = fp->_p;
78 nl = memchr(fp->_p, '\n', fp->_r);
79 nconv = l->__mbsnrtowcs(wsp, &src,
80 nl != NULL ? (nl - fp->_p + 1) : fp->_r,
81 n - 1, &fp->_mbstate);
82 if (nconv == (size_t)-1) {
83 /* Conversion error */
84 fp->_flags |= __SERR;
85 goto error;
86 }
87 if (src == NULL) {
88 /*
89 * We hit a null byte. Increment the character count,
90 * since mbsnrtowcs()'s return value doesn't include
91 * the terminating null, then resume conversion
92 * after the null.
93 */
94 nconv++;
95 src = memchr(fp->_p, '\0', fp->_r);
96 src++;
97 }
98 fp->_r -= (unsigned char *)src - fp->_p;
99 fp->_p = (unsigned char *)src;
100 n -= nconv;
101 wsp += nconv;
102 } while ((wsp == ws || wsp[-1] != L'\n') && n > 1 && (fp->_r > 0 ||
103 (sret = __srefill(fp)) == 0));
104 if (sret && !__sfeof(fp))
105 /* ferror */
106 goto error;
107 if (!l->__mbsinit(&fp->_mbstate)) {
108 /* Incomplete character */
109 fp->_flags |= __SERR;
110 errno = EILSEQ;
111 goto error;
112 }
113 if (wsp == ws)
114 /* EOF */
115 goto error;
116 ok:
117 *wsp = L'\0';
118 ret = ws;
119 end:
120 FUNLOCKFILE_CANCELSAFE();
121 return (ret);
122
123 error:
124 ret = NULL;
125 goto end;
126 }
127
128 wchar_t *
fgetws(wchar_t * __restrict ws,int n,FILE * __restrict fp)129 fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp)
130 {
131 return fgetws_l(ws, n, fp, __get_locale());
132 }
133