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fgetws.c revision 1.2 
      1 /* $NetBSD: fgetws.c,v 1.2 2006/07/03 17:06:36 tnozaki 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 1.2 2006/07/03 17:06:36 tnozaki 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 *
     46 fgetws(ws, n, fp)
     47 	wchar_t * __restrict ws;
     48 	int n;
     49 	FILE * __restrict fp;
     50 {
     51 	wchar_t *wsp;
     52 	wint_t wc;
     53 
     54 	_DIAGASSERT(fp != NULL);
     55 	_DIAGASSERT(ws != NULL);
     56 
     57 	FLOCKFILE(fp);
     58 	_SET_ORIENTATION(fp, 1);
     59 
     60 	if (n <= 0) {
     61 		errno = EINVAL;
     62 		goto error;
     63 	}
     64 
     65 	wsp = ws;
     66 	while (n-- > 1) {
     67 		wc = __fgetwc_unlock(fp);
     68 		if (__sferror(fp) != 0)
     69 			goto error;
     70 		if (__sfeof(fp) != 0) {
     71 			if (wsp == ws) {
     72 				/* EOF/error, no characters read yet. */
     73 				goto error;
     74 			}
     75 			break;
     76 		}
     77 		*wsp++ = (wchar_t)wc;
     78 		if (wc == L'\n') {
     79 			break;
     80 		}
     81 	}
     82 
     83 	*wsp++ = L'\0';
     84 	FUNLOCKFILE(fp);
     85 
     86 	return (ws);
     87 
     88 error:
     89 	FUNLOCKFILE(fp);
     90 	return (NULL);
     91 }
     92