1 /* $NetBSD: fgetwc.c,v 1.13 2012/03/15 18:22:30 christos Exp $ */
2
3 /*-
4 * Copyright (c)2001 Citrus Project,
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 * $Citrus$
29 */
30
31 #include <sys/cdefs.h>
32 #if defined(LIBC_SCCS) && !defined(lint)
33 __RCSID("$NetBSD: fgetwc.c,v 1.13 2012/03/15 18:22:30 christos Exp $");
34 #endif /* LIBC_SCCS and not lint */
35
36 #include <assert.h>
37 #include <errno.h>
38 #include <stdio.h>
39 #include <wchar.h>
40 #include "reentrant.h"
41 #include "local.h"
42
43 wint_t
__fgetwc_unlock(FILE * fp)44 __fgetwc_unlock(FILE *fp)
45 {
46 struct wchar_io_data *wcio;
47 wchar_t wc;
48 size_t nr;
49
50 _DIAGASSERT(fp != NULL);
51
52 _SET_ORIENTATION(fp, 1);
53 wcio = WCIO_GET(fp);
54 _DIAGASSERT(wcio != NULL);
55
56 /* if there're ungetwc'ed wchars, use them */
57 if (wcio->wcio_ungetwc_inbuf)
58 return wcio->wcio_ungetwc_buf[--wcio->wcio_ungetwc_inbuf];
59
60 if (fp->_r <= 0) {
61 restart:
62 if (__srefill(fp) != 0)
63 return WEOF;
64 }
65 nr = mbrtowc(&wc, (const char *)fp->_p,
66 (size_t)fp->_r, &wcio->wcio_mbstate_in);
67 if (nr == (size_t)-1) {
68 fp->_flags |= __SERR;
69 return WEOF;
70 } else if (nr == (size_t)-2) {
71 fp->_p += fp->_r;
72 fp->_r = 0;
73 goto restart;
74 }
75 if (wc == L'\0') {
76 while (*fp->_p != '\0') {
77 ++fp->_p;
78 --fp->_r;
79 }
80 nr = 1;
81 }
82 fp->_p += nr;
83 _DIAGASSERT(__type_fit(int, fp->_r - nr));
84 fp->_r -= (int)nr;
85
86 return wc;
87 }
88
89 wint_t
fgetwc(FILE * fp)90 fgetwc(FILE *fp)
91 {
92 wint_t r;
93
94 _DIAGASSERT(fp != NULL);
95
96 FLOCKFILE(fp);
97 r = __fgetwc_unlock(fp);
98 FUNLOCKFILE(fp);
99
100 return r;
101 }
102
103