#include "c.h"
#include "pg_getopt.h"

Include dependency graph for getopt.c:

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

char *	optarg

Macro Definition Documentation

◆ BADARG

#define BADARG (int)':'

Definition at line 58 of file getopt.c.

◆ BADCH

#define BADCH (int)'?'

Definition at line 57 of file getopt.c.

◆ EMSG

#define EMSG ""

Definition at line 59 of file getopt.c.

Function Documentation

◆ getopt()

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

Definition at line 72 of file getopt.c.

{
    static char *place = EMSG;  /* option letter processing */
    char       *oli;            /* option letter list index */
 
    if (!*place)
    {                           /* update scanning pointer */
        if (optind >= nargc || *(place = nargv[optind]) != '-')
        {
            place = EMSG;
            return -1;
        }
        if (place[1] && *++place == '-' && place[1] == '\0')
        {                       /* 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) '-')
        {
            place = EMSG;
            return -1;
        }
        if (!*place)
            ++optind;
        if (opterr && *ostr != ':')
            (void) fprintf(stderr,
                           "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) fprintf(stderr,
                               "option requires an argument -- %c\n",
                               optopt);
            return BADCH;
        }
        else
            /* white space */
            optarg = nargv[optind];
        place = EMSG;
        ++optind;
    }
    return optopt;              /* dump back option letter */
}