getopt.c

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/* $Header: /var/cvs/mbdyn/mbdyn/mbdyn-1.0/libraries/libobjs/getopt.c,v 1.20 2017/01/12 14:44:46 masarati Exp $ */
/* 
 * MBDyn (C) is a multibody analysis code. 
 * http://www.mbdyn.org
 *
 * Copyright (C) 1996-2017
 *
 * Pierangelo Masarati  <masarati@aero.polimi.it>
 * Paolo Mantegazza     <mantegazza@aero.polimi.it>
 *
 * Dipartimento di Ingegneria Aerospaziale - Politecnico di Milano
 * via La Masa, 34 - 20156 Milano, Italy
 * http://www.aero.polimi.it
 *
 * Changing this copyright notice is forbidden.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation (version 2 of the License).
 * 
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 * The body of the `getopt' function comes from the OpenLDAP
 * 
 *              http://www.openldap.org
 * 
 * implementation for those systems that do not have a native one.
 * The intellectual property of the OpenLDAP implementation remains 
 * with the original Authors, whose contribution is kindly appreciated.
 */

/*
 * Copyright 1998-2017 The OpenLDAP Foundation, All Rights Reserved.
 * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
 */
/*
        getopt.c

        modified public-domain AT&T getopt(3)
        modified by Kurt Zeilenga for inclusion into OpenLDAP
        modified by Pierangelo Masarati for inclusion with MBDyn
*/

#include "mbconfig.h"           /* This goes first in every *.c,*.cc file */

#ifndef HAVE_GETOPT

#include <stdio.h>

#include <string.h>
#include <unistd.h>

#ifdef HAVE_IO_H
#include <io.h>
#endif

#ifndef STDERR_FILENO
#define STDERR_FILENO 2
#endif

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

static void ERR (char * const argv[], const char * s, char c)
{
        char errbuf[2];

#ifdef DF_TRACE_DEBUG
printf("DF_TRACE_DEBUG:         static void ERR () in getopt.c\n");
#endif
        if (opterr)
        {
                errbuf[0] = c;
                errbuf[1] = '\n';
                (void) write(STDERR_FILENO,argv[0],strlen(argv[0]));
                (void) write(STDERR_FILENO,s,strlen(s));
                (void) write(STDERR_FILENO,errbuf,sizeof errbuf);
        }
}

int getopt (int argc, char * const argv [], const char * opts)
{
        static int sp = 1, error = (int) '?';
        static char sw = '-', eos = '\0', arg = ':';
        register char c, * cp;

#ifdef DF_TRACE_DEBUG
printf("DF_TRACE_DEBUG:         int getopt () in getopt.c\n");
#endif
        if (sp == 1)
        {
                if (optind >= argc || argv[optind][0] != sw
                || argv[optind][1] == eos)
                        return EOF;
                else if (strcmp(argv[optind],"--") == 0)
                {
                        optind++;
                        return EOF;
                }
        }
        c = argv[optind][sp];
        optopt = (int) c;
        if (c == arg || (cp = strchr(opts,c)) == NULL)
        {
                ERR(argv,": illegal option--",c);
                if (argv[optind][++sp] == eos)
                {
                        optind++;
                        sp = 1;
                }
                return error;
        }
        else if (*++cp == arg)
        {
                if (argv[optind][sp + 1] != eos)
                        optarg = &argv[optind++][sp + 1];
                else if (++optind >= argc)
                {
                        ERR(argv,": option requires an argument--",c);
                        sp = 1;
                        return error;
                }
                else
                        optarg = argv[optind++];
                sp = 1;
        }
        else
        {
                if (argv[optind][++sp] == eos)
                {
                        sp = 1;
                        optind++;
                }
                optarg = NULL;
        }
        return (int) c;
}
#endif /* HAVE_GETOPT */