1 /* $NetBSD: fgetws.c,v 1.3 2012/03/15 18:22:30 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2002 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 * Original version ID:
29 * FreeBSD: src/lib/libc/stdio/fgetws.c,v 1.4 2002/09/20 13:25:40 tjr Exp
30 *
31 */
32
33 #include <sys/cdefs.h>
34 #if defined(LIB_SCCS) && !defined(lint)
35 __RCSID("$NetBSD: fgetws.c,v 1.3 2012/03/15 18:22:30 christos Exp $");
36 #endif
37
38 #include <assert.h>
39 #include <errno.h>
40 #include <stdio.h>
41 #include <wchar.h>
42 #include "reentrant.h"
43 #include "local.h"
44
45 wchar_t *
fgetws(wchar_t * __restrict ws,int n,FILE * __restrict fp)46 fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp)
47 {
48 wchar_t *wsp;
49 wint_t wc;
50
51 _DIAGASSERT(fp != NULL);
52 _DIAGASSERT(ws != NULL);
53
54 FLOCKFILE(fp);
55 _SET_ORIENTATION(fp, 1);
56
57 if (n <= 0) {
58 errno = EINVAL;
59 goto error;
60 }
61
62 wsp = ws;
63 while (n-- > 1) {
64 wc = __fgetwc_unlock(fp);
65 if (__sferror(fp) != 0)
66 goto error;
67 if (__sfeof(fp) != 0) {
68 if (wsp == ws) {
69 /* EOF/error, no characters read yet. */
70 goto error;
71 }
72 break;
73 }
74 *wsp++ = (wchar_t)wc;
75 if (wc == L'\n') {
76 break;
77 }
78 }
79
80 *wsp++ = L'\0';
81 FUNLOCKFILE(fp);
82
83 return ws;
84
85 error:
86 FUNLOCKFILE(fp);
87 return NULL;
88 }
89