lib/libc/stdio/fgetws.c

   1 /* $NetBSD: fgetws.c,v 1.1 2003/03/07 07:11:37 tshiozak 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 1.1 2003/03/07 07:11:37 tshiozak 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 }