getopt.cpp

来自「计算机人工智能方面的决策树方法 c4.5」· C++ 代码 · 共 47 行

/*************************************************************************/
/*                                                                       */
/*  This file is included in case your version of Unix doesn't include   */
/*  the getopt utility.  If it does, discard this file and amend the     */
/*  Makefile accordingly.                                                */
/*                                                                       */
/*  There is no copyright on this file.                                  */
/*                                                                       */
/*************************************************************************/


#include <stdio.h>


int optind = 1;
char *optarg;


int    getopt(int Argc, char **Argv, char *Str)
/*  ------  */
{
    int Optchar;
    char *Option;

    if ( optind >= Argc ) return EOF;

    Option = Argv[optind++];

    if ( *Option++ != '-' ) return '?';

    Optchar = *Option++;

    while ( *Str && *Str != Optchar ) Str++;
    if ( ! *Str ) return '?';

    if ( *++Str == ':' )
    {
	if ( *Option ) optarg = Option;
	else
	if ( optind < Argc ) optarg = Argv[optind++];
	else
	Optchar = '?';
    }

    return Optchar;
}