getopt.h

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#ifndef GETOPT_H
#define GETOPT_H

#include <string.h>
#include <stdio.h>

int opterr = 1,              
	optind = 1,              
	optopt,                  
	optreset;                
char *optarg;                 

#define BADCH   (int)'?'
#define BADARG  (int)':'
#define EMSG    ""

 
int getopt(int nargc, char * const nargv[], const char *ostr)
{
	static char *place = EMSG;               
	const char *oli;                         

	if (optreset || !*place) {               
		optreset = 0;
		if (optind >= nargc || *(place = nargv[optind]) != '-') {
			place = EMSG;
			return (-1);
		}
		if (place[1] && *++place == '-') {       
			++optind;
			place = EMSG;
			return (-1);
		}
	}                                        
	if ((optopt = (int)*place++) == (int)':' ||
		!(oli = strchr(ostr, optopt))) {
			 
			if (optopt == (int)'-')
				return (-1);
			if (!*place)
				++optind;
			if (opterr && *ostr != ':')
				(void)printf("illegal option -- %c\n", optopt);
			return (BADCH);
	}
	if (*++oli != ':') {                     
		optarg = NULL;
		if (!*place)
			++optind;
	}
	else {                                   
		if (*place)                      
			optarg = place;
		else if (nargc <= ++optind) {    
			place = EMSG;
			if (*ostr == ':')
				return (BADARG);
			if (opterr)
				(void)printf("option requires an argument -- %c\n", optopt);
			return (BADCH);
		}
		else                             
			optarg = nargv[optind];
		place = EMSG;
		++optind;
	}
	return (optopt);                         
}


#endif