mbsnbcpy.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 76 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"



/****
***** Copy one string over another, up to a specified number of
***** bytes.  Equivalent to strncpy().
****/

_WCRTLINK unsigned char _FFAR *_NEARFAR(_mbsnbcpy,_fmbsnbcpy)( unsigned char _FFAR *dst, const unsigned char _FFAR *src, size_t n )
{
    //int   len;
    unsigned char _FFAR *d = dst;

//    if( !__IsDBCS )  return( strncpy( dst, src, n ) );

    //len = _NEARFAR(strlen,_fstrlen)( src );
    //if( _ismbblead(*(src+n)) && n<len )  n--;     /* only whole chars */

    while (n > 0) {
        if (*src == 0x00) {
            break;
        }

        *d++ = *src++;
        --n;
    }

    if (*src && (d > dst)) {          // only whole chars
        if (_ismbblead(src[-1])) {
            d[-1] = 0x00;
        }
    }

    if (n > 0) {
        _NEARFAR(memset, _fmemset)(d, 0, n);
    }

    return dst;
}