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
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34
35 #include "namespace.h"
36 #include <errno.h>
37 #include <stdio.h>
38 #include <string.h>
39 #include <wchar.h>
40 #include "un-namespace.h"
41 #include "libc_private.h"
42 #include "local.h"
43 #include "mblocal.h"
44
45 wchar_t *
fgetws_l(wchar_t * __restrict ws,int n,FILE * __restrict fp,locale_t locale)46 fgetws_l(wchar_t * __restrict ws, int n, FILE * __restrict fp, locale_t locale)
47 {
48 int sret;
49 wchar_t *wsp, *ret;
50 size_t nconv;
51 const char *src;
52 unsigned char *nl;
53 FIX_LOCALE(locale);
54 struct xlocale_ctype *l = XLOCALE_CTYPE(locale);
55
56 FLOCKFILE_CANCELSAFE(fp);
57 ORIENT(fp, 1);
58
59 if (n <= 0) {
60 fp->_flags |= __SERR;
61 errno = EINVAL;
62 goto error;
63 }
64
65 wsp = ws;
66 if (n == 1)
67 goto ok;
68
69 if (fp->_r <= 0 && __srefill(fp))
70 /* EOF or ferror */
71 goto error;
72
73 sret = 0;
74 do {
75 src = fp->_p;
76 nl = memchr(fp->_p, '\n', fp->_r);
77 nconv = l->__mbsnrtowcs(wsp, &src,
78 nl != NULL ? (nl - fp->_p + 1) : fp->_r,
79 n - 1, &fp->_mbstate);
80 if (nconv == (size_t)-1) {
81 /* Conversion error */
82 fp->_flags |= __SERR;
83 goto error;
84 }
85 if (src == NULL) {
86 /*
87 * We hit a null byte. Increment the character count,
88 * since mbsnrtowcs()'s return value doesn't include
89 * the terminating null, then resume conversion
90 * after the null.
91 */
92 nconv++;
93 src = memchr(fp->_p, '\0', fp->_r);
94 src++;
95 }
96 fp->_r -= (unsigned char *)src - fp->_p;
97 fp->_p = (unsigned char *)src;
98 n -= nconv;
99 wsp += nconv;
100 } while ((wsp == ws || wsp[-1] != L'\n') && n > 1 && (fp->_r > 0 ||
101 (sret = __srefill(fp)) == 0));
102 if (sret && !__sfeof(fp))
103 /* ferror */
104 goto error;
105 if (!l->__mbsinit(&fp->_mbstate)) {
106 /* Incomplete character */
107 fp->_flags |= __SERR;
108 errno = EILSEQ;
109 goto error;
110 }
111 if (wsp == ws)
112 /* EOF */
113 goto error;
114 ok:
115 *wsp = L'\0';
116 ret = ws;
117 end:
118 FUNLOCKFILE_CANCELSAFE();
119 return (ret);
120
121 error:
122 ret = NULL;
123 goto end;
124 }
125
126 wchar_t *
fgetws(wchar_t * __restrict ws,int n,FILE * __restrict fp)127 fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp)
128 {
129 return fgetws_l(ws, n, fp, __get_locale());
130 }
131