rcat.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

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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
*    Code as defined in and that are subject to the Sybase Open Watcom
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//
// RCAT : character concatenation routines
//

#include "ftnstd.h"
#include "rtenv.h"

#include <stdarg.h>
#include <string.h>


void    Cat( int num_args, string *dest, ... ) {
//==============================================

// Perform character concatenation.

    int         dest_len;
    int         src_len;
    char        *dest_ptr;
    string      *src;
    va_list     parminfo;

    dest_len = dest->len;
    dest_ptr = dest->strptr;
    va_start( parminfo, dest );
    for( ;; ) {
        if( dest_len == 0 ) break;
        if( num_args == 0 ) {
            memset( dest_ptr, ' ', dest_len );
            break;
        }
        src = va_arg( parminfo, string * );
        src_len = src->len;
        if( dest_len < src_len ) {
            src_len = dest_len;
        }
        memcpy( dest_ptr, src->strptr, src_len );
        dest_len -= src_len;
        dest_ptr += src_len;
        --num_args;
    }
    va_end( parminfo );
}