mbsnbcnt.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 64 行

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*
*                            Open Watcom Project
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*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*    This file contains Original Code and/or Modifications of Original
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#include "variety.h"
#include <mbstring.h>
#include "farfunc.h"



/****
***** Return the number of bytes in the first 'n' multibyte characters
***** of 'string', excluding the terminating NULL.
****/

_WCRTLINK size_t _NEARFAR(_mbsnbcnt,_fmbsnbcnt)( const unsigned char _FFAR *string, size_t n )
{
    size_t              bytes = 0;

    /*** Count the number of bytes ***/
    while( !_NEARFAR(_mbterm,_fmbterm)(string) && n>0 ) { /* cook until done */
        if( _ismbblead(*string) ) {             /* is it a lead byte? */
            if( string[1] != '\0' )             /* yes, is next char NULL? */
                bytes += _NEARFAR(_mbclen,_fmbclen)( string );  /* no, update 'bytes' */
            else
                return( bytes );                /* yes, return */
        }
        else
            bytes++;                            /* just single byte char */
        string = _NEARFAR(_mbsinc,_fmbsinc)( string );  /* next char */
        n--;                                    /* update counter */
    }

    return( bytes );
}