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      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 *
     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