jstrncpy.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 94 行

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*
*                            Open Watcom Project
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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 <jctype.h>
#include <jstring.h>


/**
*
*  Name:        jstrncpy        暥帤楍傪僐僺乕偡傞
*
*  Synopsis:    p = jstrncpy( to, from, n );
*
*               JSTRING p;      倲倧偲摨偠抣
*               JSTRING to;     僐僺乕偝傟傞暥帤楍
*               JSTRING 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
*
*  Returns:     僐僺乕愭偺億僀儞僞乕傪曉偟傑偡丅乮堷悢倲倧偲摨偠抣乯
*
*
*  Name:        jstrncpy        copy the characters from the string
*
*  Synopsis:    p = jstrncpy( to, from, n );
*
*               JSTRING p;      return value same as distination pointer
*               JSTRING to;     distination pointer into the string
*               JSTRING from;   pointer to the source string
*               int     n;      number of letters should be copied
*
*  Description: The jstrncpy 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.
*
*  Returns:     The jstrncpy function returns the value of "to".
*
**/

_WCRTLINK JSTRING jstrncpy( JCHAR *to, const JCHAR *from, size_t n )
{
    size_t i;
    JCHAR *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 );
}