getopt.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "getopt.h"

Include dependency graph for getopt.c:

Go to the source code of this file.

Macros
#define	BADCH   (int)'?'
#define	EMSG   ""
#define	tell(s)

Functions
int	getopt (int argc, char *const *argv, const char *optstring)

Variables
int	opterr = 1
int	optind = 1
int	optopt
char *	optarg

Macro Definition Documentation

BADCH

#define BADCH   (int)'?'

Definition at line 26 of file getopt.c.

EMSG

#define EMSG   ""

Definition at line 27 of file getopt.c.

tell

#define tell

(

s

)

Value:

    fputs(*argv,stderr);fputs(s,stderr); \
    fputc(optopt,stderr);fputc('\n',stderr);return(BADCH);

Definition at line 28 of file getopt.c.

Function Documentation

getopt()

int getopt	(	int	argc,
		char *const *	argv,
		const char *	optstring
	)

Definition at line 31 of file getopt.c.

{
    static char *place = EMSG;  /* option letter processing */
    register char   *oli;       /* option letter list index */
 
    if(!*place) {           /* update scanning pointer */
        if(optind >= argc || *(place = argv[optind]) != '-' || !*++place)
            return(EOF);
        if (*place == '-') {    /* found "--" */
            ++optind;
            return(EOF);
        }
    }               /* option letter okay? */
    if ((optopt = (int)*place++) == (int)':' || !(oli = strchr(optstring,optopt)))
    {
        if(!*place) ++optind;
        tell(": illegal option -- ");
    }
    if (*++oli != ':') {        /* don't need argument */
        optarg = NULL;
        if (!*place) ++optind;
    }
    else {              /* need an argument */
        if (*place) optarg = place; /* no white space */
        else if (argc <= ++optind) {    /* no arg */
            place = EMSG;
            tell(": option requires an argument -- ");
        }
        else optarg = argv[optind]; /* white space */
        place = EMSG;
        ++optind;
    }
    return(optopt);         /* dump back option letter */
}

Variable Documentation

optarg

char* optarg

Definition at line 24 of file getopt.c.

opterr

int opterr = 1

Definition at line 21 of file getopt.c.

optind

int optind = 1

Definition at line 22 of file getopt.c.

optopt

int optopt

Definition at line 23 of file getopt.c.