text: /*
   * Copyright (c) 1999-2000, Image Power, Inc. and the University of
   *   British Columbia.
   * Copyright (c) 2001-2002 Michael David Adams.
   * All rights reserved. 
   */
  
  /* __START_OF_JASPER_LICENSE__
   * 
   * JasPer License Version 2.0
   * 
   * Copyright (c) 2001-2006 Michael David Adams
   * Copyright (c) 1999-2000 Image Power, Inc.
   * Copyright (c) 1999-2000 The University of British Columbia
   * 
   * All rights reserved.
   * 
   * Permission is hereby granted, free of charge, to any person (the
   * "User") obtaining a copy of this software and associated documentation
   * files (the "Software"), to deal in the Software without restriction,
   * including without limitation the rights to use, copy, modify, merge,
   * publish, distribute, and/or sell copies of the Software, and to permit
   * persons to whom the Software is furnished to do so, subject to the
   * following conditions:
   * 
   * 1.  The above copyright notices and this permission notice (which
   * includes the disclaimer below) shall be included in all copies or
   * substantial portions of the Software.
   * 
   * 2.  The name of a copyright holder shall not be used to endorse or
   * promote products derived from the Software without specific prior
   * written permission.
   * 
   * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
   * LICENSE.  NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
   * THIS DISCLAIMER.  THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
   * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
   * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
   * PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.  IN NO
   * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
   * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
   * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
   * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
   * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.  NO ASSURANCES ARE
   * PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
   * THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
   * EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
   * BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
   * PROPERTY RIGHTS OR OTHERWISE.  AS A CONDITION TO EXERCISING THE RIGHTS
   * GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
   * ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY.  THE SOFTWARE
   * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
   * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
   * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
   * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
   * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
   * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
   * RISK ACTIVITIES").  THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
   * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
   * 
   * __END_OF_JASPER_LICENSE__
   */
  
  /*
   * Command Line Option Parsing Library
   *
   * $Id$
   */
  
  /******************************************************************************\
  * Includes.
  \******************************************************************************/
  
  #define JAS_FOR_INTERNAL_USE_ONLY
  
  #include "jasper/jas_getopt.h"
  #include "jasper/jas_math.h"
  #include "jasper/jas_debug.h"
  
  #include <string.h>
  
  /******************************************************************************\
  * Global data.
  \******************************************************************************/
  
  /* MUTABLE_SHARED_STATE_TAG: This is mutable shared state. */
  int jas_optind = 0;
  int jas_opterr = 1;
  const char *jas_optarg = 0;
  
  /******************************************************************************\
  * Code.
  \******************************************************************************/
  
  static const jas_opt_t *jas_optlookup(const jas_opt_t *opts, const char *name)
  {
  	const jas_opt_t *opt;
  
  	for (opt = opts; opt->id >= 0 && opt->name; ++opt) {
  		if (!strcmp(opt->name, name)) {
  			return opt;
  		}
  	}
  	return 0;
  }
  
  int jas_getopt(int argc, char **argv, const jas_opt_t *opts)
  {
  	const char *cp;
  	int id;
  	int hasarg;
  	const jas_opt_t *opt;
  	const char *s;
  
  	if (!jas_optind) {
  		jas_optind = JAS_MIN(1, argc);
  	}
  	while (jas_optind < argc) {
  		s = cp = argv[jas_optind];
  		if (*cp == '-') {
  			/* We are processing an option. */
  			++jas_optind;
  			if (*++cp == '-') {
  				/* We are processing a long option. */
  				++cp;
  				if (*cp == '\0') {
  					/* This is the end of the options. */
  					return JAS_GETOPT_EOF;
  				}
  				if (!(opt = jas_optlookup(opts, cp))) {
  					if (jas_opterr) {
  						jas_eprintf("unknown long option %s\n", s);
  					}
  					return JAS_GETOPT_ERR;
  				}
  				hasarg = (opt->flags & JAS_OPT_HASARG) != 0;
  				id = opt->id;
  			} else {
  				/* We are processing a short option. */
  				if (strlen(cp) != 1 ||
  				  !(opt = jas_optlookup(opts, cp))) {
  					if (jas_opterr) {
  						jas_eprintf("unknown short option %s\n", s);
  					}
  					return JAS_GETOPT_ERR;
  				}
  				hasarg = (opt->flags & JAS_OPT_HASARG) != 0;
  				id = opt->id;
  			}
  			if (hasarg) {
  				/* The option has an argument. */
  				if (jas_optind >= argc) {
  					if (jas_opterr) {
  						jas_eprintf("missing argument for option %s\n", s);
  					}
  					return JAS_GETOPT_ERR;
  				}
  				jas_optarg = argv[jas_optind];
  				++jas_optind;
  			} else {
  				/* The option does not have an argument. */
  				jas_optarg = 0;
  			}
  			return id;
  		} else {
  			/* We are not processing an option. */
  			return JAS_GETOPT_EOF;
  		}
  	}
  	return JAS_GETOPT_EOF;
  }
  