1 /*-
2 * Copyright (c) 2002-2004 Tim J. Robbins.
3 * All rights reserved.
4 *
5 * Copyright (c) 2011 The FreeBSD Foundation
6 * All rights reserved.
7 * Portions of this software were developed by David Chisnall
8 * under sponsorship from the FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $FreeBSD: head/lib/libc/stdio/fgetwc.c 234799 2012-04-29 16:28:39Z das $
32 */
33
34
35 #include "namespace.h"
36 #include <errno.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <wchar.h>
40 #include "un-namespace.h"
41 #include "libc_private.h"
42 #include "local.h"
43 #include "mblocal.h"
44 #include "xlocale_private.h"
45
46 /*
47 * MT-safe version.
48 */
49 wint_t
fgetwc_l(FILE * fp,locale_t locale)50 fgetwc_l(FILE *fp, locale_t locale)
51 {
52 wint_t r;
53 FIX_LOCALE(locale);
54
55 FLOCKFILE(fp);
56 ORIENT(fp, 1);
57 r = __fgetwc(fp, locale);
58 FUNLOCKFILE(fp);
59
60 return (r);
61 }
62
63 wint_t
fgetwc(FILE * fp)64 fgetwc(FILE *fp)
65 {
66 return fgetwc_l(fp, __get_locale());
67 }
68
69 /*
70 * Internal (non-MPSAFE) version of fgetwc(). This version takes an
71 * mbstate_t argument specifying the initial conversion state. For
72 * wide streams, this should always be fp->_mbstate. On return, *nread
73 * is set to the number of bytes read.
74 */
75 wint_t
__fgetwc_mbs(FILE * fp,mbstate_t * mbs,int * nread,locale_t locale)76 __fgetwc_mbs(FILE *fp, mbstate_t *mbs, int *nread, locale_t locale)
77 {
78 wchar_t wc;
79 size_t nconv;
80 struct xlocale_ctype *l = XLOCALE_CTYPE(locale);
81
82 if (fp->pub._r <= 0 && __srefill(fp)) {
83 *nread = 0;
84 return (WEOF);
85 }
86 if (MB_CUR_MAX == 1) {
87 /* Fast path for single-byte encodings. */
88 wc = *fp->pub._p++;
89 fp->pub._r--;
90 *nread = 1;
91 return (wc);
92 }
93 *nread = 0;
94 do {
95 nconv = l->__mbrtowc(&wc, fp->pub._p, fp->pub._r, mbs);
96 if (nconv == (size_t)-1)
97 break;
98 else if (nconv == (size_t)-2)
99 continue;
100 else if (nconv == 0) {
101 fp->pub._p++;
102 fp->pub._r--;
103 (*nread)++;
104 return (L'\0');
105 } else {
106 fp->pub._p += nconv;
107 fp->pub._r -= nconv;
108 *nread += nconv;
109 return (wc);
110 }
111 } while (__srefill(fp) == 0);
112 fp->pub._flags |= __SERR;
113 errno = EILSEQ;
114 return (WEOF);
115 }
116