StdLib/LibC/Stdio/fgetwc.c

   1 /*-
   2  * Copyright (c)2001 Citrus Project,
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $Citrus$
  27
  28   NetBSD: fgetwc.c,v 1.5 2006/07/03 17:06:36 tnozaki Exp
  29  */
  30 #include  <LibConfig.h>
  31 #include  <sys/EfiCdefs.h>
  32
  33 #include  <assert.h>
  34 #include  <errno.h>
  35 #include  <stdio.h>
  36 #include  <wchar.h>
  37 #include  "reentrant.h"
  38 #include  "local.h"
  39
  40 wint_t
  41 __fgetwc_unlock(FILE *fp)
  42 {
  43   struct wchar_io_data *wcio;
  44   mbstate_t *st;
  45   wchar_t wc;
  46   size_t size;
  47
  48   _DIAGASSERT(fp != NULL);
  49
  50   _SET_ORIENTATION(fp, 1);
  51   wcio = WCIO_GET(fp);
  52   if (wcio == 0) {
  53     errno = ENOMEM;
  54     return WEOF;
  55   }
  56
  57   /* if there're ungetwc'ed wchars, use them */
  58   if (wcio->wcio_ungetwc_inbuf) {
  59     wc = wcio->wcio_ungetwc_buf[--wcio->wcio_ungetwc_inbuf];
  60
  61     return wc;
  62   }
  63
  64   st = &wcio->wcio_mbstate_in;
  65
  66   do {
  67     char c;
  68     int ch = __sgetc(fp);
  69
  70     if (ch == EOF) {
  71       return WEOF;
  72     }
  73
  74     c = (char)ch;
  75     size = mbrtowc(&wc, &c, 1, st);
  76     if (size == (size_t)-1) {
  77       errno = EILSEQ;
  78       fp->_flags |= __SERR;
  79       return WEOF;
  80     }
  81   } while (size == (size_t)-2);
  82
  83   _DIAGASSERT(size == 1);
  84
  85   return wc;
  86 }
  87
  88 wint_t
  89 fgetwc(FILE *fp)
  90 {
  91   wint_t r;
  92
  93   _DIAGASSERT(fp != NULL);
  94
  95   FLOCKFILE(fp);
  96   r = __fgetwc_unlock(fp);
  97   FUNLOCKFILE(fp);
  98
  99   return (r);
 100 }