StdLib/LibC/Stdio/fgetws.c

   1 /*
   2     Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
   3     This program and the accompanying materials are licensed and made available
   4     under the terms and conditions of the BSD License that accompanies this
   5     distribution.  The full text of the license may be found at
   6     http://opensource.org/licenses/bsd-license.
   7
   8     THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   9     WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  10
  11  * Copyright (c) 2002 Tim J. Robbins.
  12  * All rights reserved.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  * Original version ID:
  36  * FreeBSD: src/lib/libc/stdio/fgetws.c,v 1.4 2002/09/20 13:25:40 tjr Exp
  37
  38     $NetBSD: fgetws.c,v 1.2 2006/07/03 17:06:36 tnozaki Exp $
  39 */
  40 #include  <LibConfig.h>
  41 #include <sys/EfiCdefs.h>
  42
  43 #include <assert.h>
  44 #include <errno.h>
  45 #include <stdio.h>
  46 #include <wchar.h>
  47 #include "reentrant.h"
  48 #include "local.h"
  49
  50 wchar_t *
  51 fgetws(
  52   wchar_t * __restrict ws,
  53   int n,
  54   FILE * __restrict fp
  55   )
  56 {
  57   wchar_t *wsp;
  58   wint_t wc;
  59
  60   _DIAGASSERT(fp != NULL);
  61   _DIAGASSERT(ws != NULL);
  62   if(fp == NULL) {
  63     errno = EINVAL;
  64     return (NULL);
  65   }
  66
  67   FLOCKFILE(fp);
  68   _SET_ORIENTATION(fp, 1);
  69
  70   if (n <= 0) {
  71     errno = EINVAL;
  72     goto error;
  73   }
  74
  75   wsp = ws;
  76   while (n-- > 1) {
  77     wc = __fgetwc_unlock(fp);
  78     if (__sferror(fp) != 0)
  79       goto error;
  80     if (__sfeof(fp) != 0) {
  81       if (wsp == ws) {
  82         /* EOF/error, no characters read yet. */
  83         goto error;
  84       }
  85       break;
  86     }
  87     *wsp++ = (wchar_t)wc;
  88     if (wc == L'\n') {
  89       break;
  90     }
  91   }
  92
  93   *wsp++ = L'\0';
  94   FUNLOCKFILE(fp);
  95
  96   return (ws);
  97
  98 error:
  99   FUNLOCKFILE(fp);
 100   return (NULL);
 101 }