lib/libc/stdio/wcio.h

   1 /* $NetBSD: wcio.h,v 1.2 2001/12/07 12:18:53 yamt Exp $ */
   2
   3 /*-
   4  * Copyright (c)2001 Citrus Project,
   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  * $Citrus$
  29  */
  30
  31 #ifndef _WCIO_H_
  32 #define _WCIO_H_
  33
  34 #include <wchar.h> /* for mbstate_t and wchar_t */
  35
  36 /* minimal requirement of SUSv2 */
  37 #define WCIO_UNGETWC_BUFSIZE 1
  38
  39 struct wchar_io_data {
  40         mbstate_t wcio_mbstate_in;
  41         mbstate_t wcio_mbstate_out;
  42
  43         wchar_t wcio_ungetwc_buf[WCIO_UNGETWC_BUFSIZE];
  44         size_t wcio_ungetwc_inbuf;
  45
  46         int wcio_mode; /* orientation */
  47 };
  48
  49 #define _SET_ORIENTATION(fp, mode) \
  50 do {\
  51         struct wchar_io_data *_wcio = WCIO_GET(fp);\
  52         if (_wcio && _wcio->wcio_mode == 0)\
  53                 _wcio->wcio_mode = (mode);\
  54 } while (/*CONSTCOND*/0)
  55
  56 /*
  57  * WCIO_FREE should be called by fclose
  58  */
  59 #define WCIO_GET(fp) (&(_EXT(fp)->_wcio))
  60 #define WCIO_FREE(fp) \
  61 do {\
  62         _EXT(fp)->_wcio.wcio_mode = 0;\
  63         WCIO_FREEUB(fp);\
  64 } while (/*CONSTCOND*/0)
  65 #define WCIO_FREEUB(fp) \
  66 do {\
  67         _EXT(fp)->_wcio.wcio_ungetwc_inbuf = 0;\
  68 } while (/*CONSTCOND*/0)
  69
  70 #endif /*_WCIO_H_*/