fjstrncp.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 95 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
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****************************************************************************/


#include "variety.h"
#include <jctype.h>
#include <jstring.h>


/**
*
*  Name:        _fjstrncpy      暥帤楍傪僐僺乕偡傞
*
*  Synopsis:    p = _fjstrncpy( to, from, n );
*
*               FJSTRING p;     倲倧偲摨偠抣
*               FJSTRING to;    僐僺乕偝傟傞暥帤楍
*               FJSTRING from;  僐僺乕偡傞暥帤楍
*               int n;          暥帤悢
*
*  Description: 暥帤楍倖倰倧倣偺愭摢偐傜値暥帤傪暥帤楍倲倧偵
*               忋彂偒偡傞丅
*
*
*  Name:        _fjstrncpy      copy the characters from the string
*
*  Synopsis:    p = _fjstrncpy( to, from, n );
*
*               FJSTRING        p;      return value same as distination
*                                       pointer
*               FJSTRING        to;     distination pointer into the string
*               FJSTRING        from;   pointer to the source string
*               int             n;      number of letters should be copied
*
*  Description: The _fjstrncpy function copy no more than "n" characters from
*               the string pointed to by "from" into the array pointed to
*               by "to". Copying of overlapping objects is not guaranteed
*               to work properly. This function is a data independent form
*               that accept far pointer argunments. It is most useful in mix
*               memory model applications.
*
*  Returns:     The _fjstrncpy function returns the value of "to".
*
**/

_WCRTLINK FJSTRING _WCI86FAR _fjstrncpy( JCHAR _WCFAR *to, const JCHAR _WCFAR *from, size_t n )
{
    int i;
    JCHAR _WCFAR *p;

    p = to;
    for( i = 0; i < n; i++ ) {
        if( iskanji( *from ) ) {
            *p++ = *from++;
            if( ( *p++ = *from++ ) == '\0' ) {
                p -= 2;
                while( ++i <= n ) *p++ = '\0';
                break;
            }
        } else if( ( *p++ = *from++ ) == '\0' ) {
            while( ++i < n ) *p++ = '\0';
            break;
        }
    }
    return( to );
}