mbsnbcmp.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 68 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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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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#include "variety.h"
#include <mbstring.h>
#include <string.h>
#include "farfunc.h"



/****
***** Compare two strings, up to a specified maximum number of bytes.
***** Equivalent to strncmp().
****/

_WCRTLINK int _NEARFAR(_mbsnbcmp,_fmbsnbcmp)( const unsigned char _FFAR *s1, const unsigned char _FFAR *s2, size_t n )
{
    int                 status = 0;
    size_t              bytes;

//    if( !__IsDBCS )  return( strncmp( s1, s2, n ) );

    /*** Compare characters, one by one ***/
    while( n>0 && !_NEARFAR(_mbterm,_fmbterm)(s1) && !_NEARFAR(_mbterm,_fmbterm)(s2) ) {
        if( n >= MB_CUR_MAX ) {
            status = _NEARFAR(_mbccmp,_fmbccmp)( s1, s2 );      /* compare */
        } else {
            status = _NEARFAR(strncmp,_fstrncmp)( s1, s2, n );  /* compare */
        }
        if( status != 0 )  break;                   /* if error, exit loop */
        bytes = _NEARFAR(_mbclen,_fmbclen)( s1 );   /* char size in bytes */
        n = n>bytes ? n-bytes : 0;                  /* update counter */
        s1 = _NEARFAR(_mbsinc,_fmbsinc)( s1 );      /* skip over character */
        s2 = _NEARFAR(_mbsinc,_fmbsinc)( s2 );      /* skip over character */
    }

    return( status );
}