getopt.c

来自「通过C4.5 的实现可以进行构建决策树 来进行有效的分类」· C语言 代码 · 共 49 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;
}