wctob.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 57 行

/****************************************************************************
*
*                            Open Watcom Project
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*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*  ========================================================================
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*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
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#include "variety.h"
#include <mbstring.h>
#include <stdio.h>
#include <wchar.h>



/****
***** Determine if 'c' corresponds to a member of the extended character set
***** whose multibyte representation is as a single byte when in the initial
***** shift state.  Returns the single byte representation if appropriate,
***** or EOF otherwise.
****/

_WCRTLINK int wctob( wint_t c )
{
    char                mbc[MB_LEN_MAX+1];

    if( wctomb( mbc, c ) == -1 )  return( EOF );
    if( _mbclen( mbc ) == 1 )
        return( mbc[0] );
    else
        return( EOF );
}