StdLib/LibC/Stdio/fgetwc.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)2001 Citrus Project,
  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  * $Citrus$
  36
  37   NetBSD: fgetwc.c,v 1.5 2006/07/03 17:06:36 tnozaki Exp
  38  */
  39 #include  <LibConfig.h>
  40 #include  <sys/EfiCdefs.h>
  41
  42 #include  <assert.h>
  43 #include  <errno.h>
  44 #include  <stdio.h>
  45 #include  <wchar.h>
  46 #include  "reentrant.h"
  47 #include  "local.h"
  48
  49 wint_t
  50 __fgetwc_unlock(FILE *fp)
  51 {
  52   struct wchar_io_data *wcio;
  53   mbstate_t *st;
  54   wchar_t wc;
  55   size_t size;
  56
  57   _DIAGASSERT(fp != NULL);
  58   if(fp == NULL) {
  59     errno = ENOSTR;
  60     return WEOF;
  61   }
  62
  63   _SET_ORIENTATION(fp, 1);
  64   wcio = WCIO_GET(fp);
  65   if (wcio == 0) {
  66     errno = ENOMEM;
  67     return WEOF;
  68   }
  69
  70   /* if there're ungetwc'ed wchars, use them */
  71   if (wcio->wcio_ungetwc_inbuf) {
  72     wc = wcio->wcio_ungetwc_buf[--wcio->wcio_ungetwc_inbuf];
  73
  74     return wc;
  75   }
  76
  77   st = &wcio->wcio_mbstate_in;
  78
  79   do {
  80     char c;
  81     int ch = __sgetc(fp);
  82
  83     if (ch == EOF) {
  84       return WEOF;
  85     }
  86
  87     c = (char)ch;
  88     size = mbrtowc(&wc, &c, 1, st);
  89     if (size == (size_t)-1) {
  90       errno = EILSEQ;
  91       fp->_flags |= __SERR;
  92       return WEOF;
  93     }
  94   } while (size == (size_t)-2);
  95
  96   _DIAGASSERT(size == 1);
  97
  98   return wc;
  99 }
 100
 101 wint_t
 102 fgetwc(FILE *fp)
 103 {
 104   wint_t r;
 105
 106   _DIAGASSERT(fp != NULL);
 107   if(fp == NULL) {
 108     errno = EINVAL;
 109     return (WEOF);
 110   }
 111
 112   FLOCKFILE(fp);
 113   r = __fgetwc_unlock(fp);
 114   FUNLOCKFILE(fp);
 115
 116   return (r);
 117 }