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/* Getopt.c - Parse command line options.
Copyright (C) 1996, 1997 Malc Arnold.
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; either version 2, or (at your option)
any later version.
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
/* Handle which string header we include */
#ifdef HAVE_STRING_H
#include <string.h>
#else /* ! HAVE_STRING_H */
#include <strings.h>
#ifndef strchr
#define strchr(s, c) index(s, c)
#endif /* ! strchr */
#endif /* ! HAVE_STRING_H */
/****************************************************************************/
/* RCS info. */
#ifndef lint
static char *RcsId = "$Id: getopt.c,v 2.1 1997/09/07 00:35:35 malc Exp $";
#endif /* ! lint */
/****************************************************************************/
/*LINTLIBRARY*/
/****************************************************************************/
/* The character returned by getopt on failure */
#define GETOPT_FAIL '?'
/****************************************************************************/
/* These error messages are defined by POSIX */
#define GETOPT_ILLEGAL "%s: illegal option -- %c\n"
#define GETOPT_NOARG "%s: option requires an argument -- %c\n"
/****************************************************************************/
/* Global variables defined by getopt */
char *optarg = NULL; /* The value of an option's argument */
int optind = 1; /* The next argument in argv[] to scan */
int opterr = 1; /* Print error messages only if set to 1 */
int optopt = GETOPT_FAIL; /* The value of any unmatched option */
/****************************************************************************/
/* Global function declarations */
extern int strcmp();
/****************************************************************************/
int getopt(argc, argv, optstring)
int argc;
char **argv, *optstring;
{
/* Return the next option in argv, or EOF if none */
static char *option = NULL;
char *c;
/* Check that we have options to process */
if (option == NULL) {
/* Try to find the next option argument */
option = (optind < argc && *argv[optind] == '-')
? argv[optind] + 1 : NULL;
/* Check for a terminating '--' argument */
if (option != NULL && !strcmp(argv[optind], "--")) {
/* Clear the option and skip the argument */
option = NULL;
optind++;
}
/* Return end-of-options if we didn't find one */
if (option == NULL) {
return(EOF);
}
}
/* Store the option found in optopt */
optopt = *option;
/* Now search for the option in optstring */
if ((c = strchr(optstring, *option++)) == NULL && opterr) {
/* Bad option, print an error message */
(void) fprintf(stderr, GETOPT_ILLEGAL, argv[0], optopt);
}
/* Update the position in options and arguments */
option = (*option != '\0') ? option : NULL;
optind = (option == NULL && optind < argc) ? optind + 1 : optind;
/* If we have an option, do we need an argument? */
if (c != NULL && *(c + 1) == ':') {
/* Get the argument and update the positions */
optarg = (option != NULL) ? option :
(optind < argc) ? argv[optind] : NULL;
optind = (optarg != NULL) ? optind + 1 : optind;
option = NULL;
/* Handle an error extracting the argument */
if (optarg == NULL && opterr) {
/* No argument, print an error message */
(void) fprintf(stderr, GETOPT_NOARG, argv[0], optopt);
return(GETOPT_FAIL);
} else if (optarg == NULL) {
/* Just silently return failure */
return(GETOPT_FAIL);
}
}
/* And return the option character */
return((c != NULL) ? optopt : GETOPT_FAIL);
}
/****************************************************************************/
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