xref: /freebsd/lib/libc/stdio/fgetws.c (revision 7591ae56aeeefc978363f92d208d5e1140090f96)
1e74101e4STim J. Robbins /*-
2e74101e4STim J. Robbins  * Copyright (c) 2002 Tim J. Robbins.
3e74101e4STim J. Robbins  * All rights reserved.
4e74101e4STim J. Robbins  *
5e74101e4STim J. Robbins  * Redistribution and use in source and binary forms, with or without
6e74101e4STim J. Robbins  * modification, are permitted provided that the following conditions
7e74101e4STim J. Robbins  * are met:
8e74101e4STim J. Robbins  * 1. Redistributions of source code must retain the above copyright
9e74101e4STim J. Robbins  *    notice, this list of conditions and the following disclaimer.
10e74101e4STim J. Robbins  * 2. Redistributions in binary form must reproduce the above copyright
11e74101e4STim J. Robbins  *    notice, this list of conditions and the following disclaimer in the
12e74101e4STim J. Robbins  *    documentation and/or other materials provided with the distribution.
13e74101e4STim J. Robbins  *
14e74101e4STim J. Robbins  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15e74101e4STim J. Robbins  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16e74101e4STim J. Robbins  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17e74101e4STim J. Robbins  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18e74101e4STim J. Robbins  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19e74101e4STim J. Robbins  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20e74101e4STim J. Robbins  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21e74101e4STim J. Robbins  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22e74101e4STim J. Robbins  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23e74101e4STim J. Robbins  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24e74101e4STim J. Robbins  * SUCH DAMAGE.
25e74101e4STim J. Robbins  */
26e74101e4STim J. Robbins 
27e74101e4STim J. Robbins #include <sys/cdefs.h>
28e74101e4STim J. Robbins __FBSDID("$FreeBSD$");
29e74101e4STim J. Robbins 
30e74101e4STim J. Robbins #include "namespace.h"
31e74101e4STim J. Robbins #include <errno.h>
32e74101e4STim J. Robbins #include <stdio.h>
33e74101e4STim J. Robbins #include <wchar.h>
34e74101e4STim J. Robbins #include "un-namespace.h"
35e74101e4STim J. Robbins #include "libc_private.h"
36e74101e4STim J. Robbins #include "local.h"
37e74101e4STim J. Robbins 
38e74101e4STim J. Robbins wchar_t *
39e74101e4STim J. Robbins fgetws(wchar_t * __restrict ws, int n, FILE * __restrict fp)
40e74101e4STim J. Robbins {
41e74101e4STim J. Robbins 	wchar_t *wsp;
4224990dfaSTim J. Robbins 	wint_t wc;
43e74101e4STim J. Robbins 
447591ae56STim J. Robbins 	FLOCKFILE(fp);
457591ae56STim J. Robbins 	ORIENT(fp, 1);
46e74101e4STim J. Robbins 
477591ae56STim J. Robbins 	if (n <= 0) {
487591ae56STim J. Robbins 		errno = EINVAL;
497591ae56STim J. Robbins 		goto error;
507591ae56STim J. Robbins 	}
51e74101e4STim J. Robbins 
52e74101e4STim J. Robbins 	wsp = ws;
53e74101e4STim J. Robbins 	while (n-- > 1) {
54e74101e4STim J. Robbins 		/* XXX Inefficient */
557591ae56STim J. Robbins 		if ((wc = __fgetwc(fp)) == WEOF && errno == EILSEQ)
567591ae56STim J. Robbins 			goto error;
5724990dfaSTim J. Robbins 		if (wc == WEOF) {
58e74101e4STim J. Robbins 			if (wsp == ws)
59e74101e4STim J. Robbins 				/* EOF/error, no characters read yet. */
607591ae56STim J. Robbins 				goto error;
61e74101e4STim J. Robbins 			break;
62e74101e4STim J. Robbins 		}
6324990dfaSTim J. Robbins 		*wsp++ = (wchar_t)wc;
6424990dfaSTim J. Robbins 		if (wc == L'\n')
65e74101e4STim J. Robbins 			break;
66e74101e4STim J. Robbins 	}
67e74101e4STim J. Robbins 	*wsp++ = L'\0';
687591ae56STim J. Robbins 	FUNLOCKFILE(fp);
69e74101e4STim J. Robbins 
70e74101e4STim J. Robbins 	return (ws);
717591ae56STim J. Robbins 
727591ae56STim J. Robbins error:
737591ae56STim J. Robbins 	FUNLOCKFILE(fp);
747591ae56STim J. Robbins 	return (NULL);
75e74101e4STim J. Robbins }
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