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      1 /* $NetBSD: wcio.h,v 1.4 2022/04/19 20:32:16 rillig 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 (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 (0)
     65 #define WCIO_FREEUB(fp) \
     66 do {\
     67 	_EXT(fp)->_wcio.wcio_ungetwc_inbuf = 0;\
     68 } while (0)
     69 
     70 #endif /*_WCIO_H_*/
     71