epicsGetopt.c File Reference

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

Include dependency graph for epicsGetopt.c:

Go to the source code of this file.

Macros
#define	_getprogname()   nargv[0]
#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
char *	optarg

Macro Definition Documentation

#define _getprogname

(

)

nargv[0]

Definition at line 46 of file epicsGetopt.c.

#define BADARG   (int)':'

Definition at line 58 of file epicsGetopt.c.

#define BADCH   (int)'?'

Definition at line 57 of file epicsGetopt.c.

#define EMSG   ""

Definition at line 59 of file epicsGetopt.c.

Function Documentation

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

Definition at line 65 of file epicsGetopt.c.

{
    static char *place = EMSG;      /* option letter processing */
    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 != ':' && optopt != BADCH)
            (void)fprintf(stderr, "%s: illegal option -- %c\n",
                _getprogname(), 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,
                    "%s: option requires an argument -- %c\n",
                    _getprogname(), optopt);
            return (BADCH);
        }
        else                /* white space */
            optarg = nargv[optind];
        place = EMSG;
        ++optind;
    }
    return (optopt);            /* dump back option letter */
}

Variable Documentation

char* optarg

Definition at line 55 of file epicsGetopt.c.

int opterr = 1

Definition at line 49 of file epicsGetopt.c.

int optind = 1

Definition at line 50 of file epicsGetopt.c.

int optopt

Definition at line 50 of file epicsGetopt.c.

int optreset

Definition at line 52 of file epicsGetopt.c.