getopt.h File Reference

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

Go to the source code of this file.

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

Functions
int	getopt (int nargc, char *const nargv[], const char *ostr)

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

Macro Definition Documentation

BADARG

#define BADARG   (int)':'

Definition at line 12 of file getopt.h.

BADCH

#define BADCH   (int)'?'

Definition at line 11 of file getopt.h.

EMSG

#define EMSG   ""

Definition at line 13 of file getopt.h.

Function Documentation

getopt()

int getopt	(	int	nargc,
		char *const	nargv[],
		const char *	ostr
	)

Definition at line 20 of file getopt.h.

{
    static const char *place = EMSG;              /* option letter processing */
    const char *oli;                        /* option letter list index */
 
    if (optreset || !*place) {              /* update scanning pointer */
        optreset = 0;
        if (optind >= nargc || *(place = nargv[optind]) != '-') {
            place = EMSG;
            return (-1);
        }
        if (place[1] && *++place == '-') {      /* found "--" */
            ++optind;
            place = EMSG;
            return (-1);
        }
    }                                       /* option letter okay? */
    if ((optopt = (int)*place++) == (int)':' ||
        !(oli = strchr (ostr, optopt))) {
        /*
        * if the user didn't specify '-' as an option,
        * assume it means -1.
        */
        if (optopt == (int)'-')
            return (-1);
        if (!*place)
            ++optind;
        if (opterr && *ostr != ':')
            (void)printf ("illegal option -- %c\n", optopt);
        return (BADCH);
    }
    if (*++oli != ':') {                    /* don't need argument */
        optarg = NULL;
        if (!*place)
            ++optind;
    }
    else {                                  /* need an argument */
        if (*place)                     /* no white space */
            optarg = place;
        else if (nargc <= ++optind) {   /* no arg */
            place = EMSG;
            if (*ostr == ':')
                return (BADARG);
            if (opterr)
                (void)printf ("option requires an argument -- %c\n", optopt);
            return (BADCH);
        }
        else                            /* white space */
            optarg = nargv[optind];
        place = EMSG;
        ++optind;
    }
    return optopt;        /* dump back option letter */
}

References BADARG, BADCH, EMSG, NULL, optarg, opterr, optind, optopt, optreset, and printf().

Referenced by main().

Variable Documentation

optarg

const char* optarg

Definition at line 9 of file getopt.h.

Referenced by getopt(), main(), and parse_real().

opterr

int opterr = 1

Definition at line 5 of file getopt.h.

Referenced by getopt().

optind

int optind = 1

Definition at line 6 of file getopt.h.

Referenced by args_parse(), getopt(), main(), and parse_environment().

optopt

int optopt

Definition at line 7 of file getopt.h.

Referenced by getopt().

optreset

int optreset

Definition at line 8 of file getopt.h.

Referenced by getopt(), and parse_environment().