1 /*
2 * Copyright 2013 Garrett D'Amore <garrett@damore.org>
3 * Copyright 2010 Nexenta Systems, Inc. All rights reserved.
4 * Copyright (c) 2002-2004 Tim J. Robbins.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include "lint.h"
30 #include "mse_int.h"
31 #include "file64.h"
32 #include "mtlib.h"
33 #include <errno.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <wchar.h>
37 #include "mblocal.h"
38 #include "stdiom.h"
39 #include "localeimpl.h"
40 #include "lctype.h"
41
42 /*
43 * Non-MT-safe version.
44 */
45 wint_t
_fgetwc_unlocked_l(FILE * fp,locale_t loc)46 _fgetwc_unlocked_l(FILE *fp, locale_t loc)
47 {
48 wchar_t wc;
49 size_t nconv;
50 int c;
51 mbstate_t *statep;
52 const struct lc_ctype *lct;
53
54 if ((c = GETC(fp)) == EOF)
55 return (WEOF);
56
57 lct = loc->ctype;
58 if (lct->lc_max_mblen == 1) {
59 /* Fast path for single-byte encodings. */
60 return ((wint_t)c);
61 }
62 if ((statep = _getmbstate(fp)) == NULL) {
63 fp->_flag = _IOERR;
64 errno = EBADF;
65 return (WEOF);
66 }
67 do {
68 char x = (char)c;
69 nconv = lct->lc_mbrtowc(&wc, &x, 1, statep);
70 if (nconv == (size_t)-1) {
71 break;
72 } else if (nconv == (size_t)-2) {
73 /* Incompletely decoded, consume another char */
74 continue;
75 } else if (nconv == 0) {
76 /*
77 * Assume that the only valid representation of
78 * the null wide character is a single null byte.
79 */
80 return (L'\0');
81 } else {
82 return (wc);
83 }
84 } while ((c = GETC(fp)) != EOF);
85
86 /*
87 * If we got here it means we got truncated in a character, or
88 * the character did not decode properly. Note that in the case
89 * of a botched decoding, we don't UNGETC the bad bytes. Should
90 * we?
91 */
92 fp->_flag |= _IOERR;
93 errno = EILSEQ;
94 return (WEOF);
95 }
96
97 wint_t
_fgetwc_unlocked(FILE * fp)98 _fgetwc_unlocked(FILE *fp)
99 {
100 return (_fgetwc_unlocked_l(fp, uselocale(NULL)));
101 }
102
103
104 /*
105 * MT safe version
106 */
107 #undef getwc
108 #pragma weak getwc = fgetwc
109 wint_t
fgetwc(FILE * fp)110 fgetwc(FILE *fp)
111 {
112 wint_t r;
113 rmutex_t *l;
114 locale_t loc = uselocale(NULL);
115
116 FLOCKFILE(l, fp);
117 r = _fgetwc_unlocked_l(fp, loc);
118 FUNLOCKFILE(l);
119
120 return (r);
121 }
122
123 /*
124 * XPG5 version.
125 */
126 #undef __getwc_xpg5
127 #pragma weak __getwc_xpg5 = __fgetwc_xpg5
128 wint_t
__fgetwc_xpg5(FILE * fp)129 __fgetwc_xpg5(FILE *fp)
130 {
131 wint_t r;
132 rmutex_t *l;
133 locale_t loc = uselocale(NULL);
134
135 FLOCKFILE(l, fp);
136 if (GET_NO_MODE(fp))
137 _setorientation(fp, _WC_MODE);
138 r = _fgetwc_unlocked_l(fp, loc);
139 FUNLOCKFILE(l);
140
141 return (r);
142 }
143
144 #pragma weak getwc_l = fgetwc_l
145 wint_t
fgetwc_l(FILE * fp,locale_t loc)146 fgetwc_l(FILE *fp, locale_t loc)
147 {
148 wint_t r;
149 rmutex_t *l;
150 FLOCKFILE(l, fp);
151 if (GET_NO_MODE(fp))
152 _setorientation(fp, _WC_MODE);
153 r = _fgetwc_unlocked_l(fp, loc);
154 FUNLOCKFILE(l);
155
156 return (r);
157 }
158