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1 /*-
2 * Copyright (c) 2002-2004 Tim J. Robbins.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: src/lib/libc/stdio/fgetws.c,v 1.8 2009/11/25 04:45:45 wollman Exp $");
29
30 #include "xlocale_private.h"
31
32 #include "namespace.h"
33 #include <errno.h>
34 #include <stdio.h>
35 #include <string.h>
36 #include <wchar.h>
37 #include "un-namespace.h"
38 #include "libc_private.h"
39 #include "local.h"
40 #include "mblocal.h"
41
42 wchar_t *
43 fgetws_l(wchar_t * __restrict ws, int n, FILE * __restrict fp, locale_t loc)
44 {
45 wchar_t *wsp;
46 size_t nconv;
47 const char *src;
48 unsigned char *nl;
49 struct __xlocale_st_runelocale *rl;
50 size_t (*__mbsnrtowcs)(wchar_t * __restrict, const char ** __restrict, size_t, size_t, __darwin_mbstate_t * __restrict, locale_t);
51
52 NORMALIZE_LOCALE(loc);
53 rl = loc->__lc_ctype;
54 __mbsnrtowcs = rl->__mbsnrtowcs;
55 FLOCKFILE(fp);
56 ORIENT(fp, 1);
57
58 if (n <= 0) {
59 errno = EINVAL;
60 goto error;
61 }
62
63 if (fp->_r <= 0 && __srefill(fp))
64 /* EOF */
65 goto error;
66 wsp = ws;
67 do {
68 src = (const char *)fp->_p;
69 nl = memchr(fp->_p, '\n', fp->_r);
70 nconv = __mbsnrtowcs(wsp, &src,
71 nl != NULL ? (nl - fp->_p + 1) : fp->_r,
72 n - 1, &fp->_mbstate, loc);
73 if (nconv == (size_t)-1)
74 /* Conversion error */
75 goto error;
76 if (src == NULL) {
77 /*
78 * We hit a null byte. Increment the character count,
79 * since mbsnrtowcs()'s return value doesn't include
80 * the terminating null, then resume conversion
81 * after the null.
82 */
83 nconv++;
84 src = memchr(fp->_p, '\0', fp->_r);
85 src++;
86 }
87 fp->_r -= (unsigned char *)src - fp->_p;
88 fp->_p = (unsigned char *)src;
89 n -= nconv;
90 wsp += nconv;
91 } while (wsp[-1] != L'\n' && n > 1 && (fp->_r > 0 ||
92 __srefill(fp) == 0));
93 if (wsp == ws)
94 /* EOF */
95 goto error;
96 if (!rl->__mbsinit(&fp->_mbstate, loc))
97 /* Incomplete character */
98 goto error;
99 *wsp = L'\0';
100 FUNLOCKFILE(fp);
101
102 return (ws);
103
104 error:
105 FUNLOCKFILE(fp);
106 return (NULL);
107 }
108
109 wchar_t *
110 fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp)
111 {
112 return fgetws_l(ws, n, fp, __current_locale());
113 }