lib/libc/stdio/fgetws.c

   1 /* $NetBSD: fgetws.c,v 1.1 2003/03/07 07:11:37 tshiozak Exp $ */
   2 /* $DragonFly: src/lib/libc/stdio/fgetws.c,v 1.1 2005/07/25 00:37:41 joerg Exp $ */
   3
   4 /*-
   5  * Copyright (c) 2002 Tim J. Robbins.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * Original version ID:
  30  * FreeBSD: src/lib/libc/stdio/fgetws.c,v 1.4 2002/09/20 13:25:40 tjr Exp
  31  *
  32  */
  33
  34 #include "namespace.h"
  35 #include <assert.h>
  36 #include <errno.h>
  37 #include <stdio.h>
  38 #include <wchar.h>
  39 #include "un-namespace.h"
  40
  41 #include "libc_private.h"
  42 #include "local.h"
  43 #include "priv_stdio.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                 if ((wc = __fgetwc_unlock(fp)) == WEOF && errno == EILSEQ) {
  65                         goto error;
  66                 }
  67                 if (wc == WEOF) {
  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 }