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/* Getopt for GNU.

   NOTE: getopt is now part of the C library, so if you don't know what

   "Keep this file name-space clean" means, talk to roland@gnu.ai.mit.edu

   before changing it!

   Copyright (C) 1987, 88, 89, 90, 91, 92, 93, 94

   	Free Software Foundation, Inc.

   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, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>.

   Ditto for AIX 3.2 and <stdlib.h>.  */

#ifndef _NO_PROTO

#define _NO_PROTO

#endif

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#ifndef __STDC__

/* This is a separate conditional since some stdc systems

   reject `defined (const)'.  */

#ifndef const

#define const

#endif

#endif

#include <stdio.h>

/* Comment out all this code if we are using the GNU C Library, and are not

   actually compiling the library itself.  This code is part of the GNU C

   Library, but also included in many other GNU distributions.  Compiling

   and linking in this code is a waste when using the GNU C library

   (especially if it is a shared library).  Rather than having every GNU

   program understand `configure --with-gnu-libc' and omit the object files,

   it is simpler to just do this in the source for each such file.  */

#if defined (_LIBC) || !defined (__GNU_LIBRARY__)

/* This needs to come after some library #include

   to get __GNU_LIBRARY__ defined.  */

#ifdef	__GNU_LIBRARY__

/* Don't include stdlib.h for non-GNU C libraries because some of them

   contain conflicting prototypes for getopt.  */

#include <stdlib.h>

#endif	/* GNU C library.  */

/* This version of `getopt' appears to the caller like standard Unix `getopt'

   but it behaves differently for the user, since it allows the user

   to intersperse the options with the other arguments.

   As `getopt' works, it permutes the elements of ARGV so that,

   when it is done, all the options precede everything else.  Thus

   all application programs are extended to handle flexible argument order.

   Setting the environment variable POSIXLY_CORRECT disables permutation.

   Then the behavior is completely standard.

   GNU application programs can use a third alternative mode in which

   they can distinguish the relative order of options and other arguments.  */

#include "getopt.h"

/* For communication from `getopt' to the caller.

   When `getopt' finds an option that takes an argument,

   the argument value is returned here.

   Also, when `ordering' is RETURN_IN_ORDER,

   each non-option ARGV-element is returned here.  */

char *optarg = NULL;

/* Index in ARGV of the next element to be scanned.

   This is used for communication to and from the caller

   and for communication between successive calls to `getopt'.

   On entry to `getopt', zero means this is the first call; initialize.

   When `getopt' returns EOF, this is the index of the first of the

   non-option elements that the caller should itself scan.

   Otherwise, `optind' communicates from one call to the next

   how much of ARGV has been scanned so far.  */

/* XXX 1003.2 says this must be 1 before any call.  */

int optind = 0;

/* The next char to be scanned in the option-element

   in which the last option character we returned was found.

   This allows us to pick up the scan where we left off.

   If this is zero, or a null string, it means resume the scan

   by advancing to the next ARGV-element.  */

static char *nextchar;

/* Callers store zero here to inhibit the error message

   for unrecognized options.  */

int opterr = 1;

/* Set to an option character which was unrecognized.

   This must be initialized on some systems to avoid linking in the

   system's own getopt implementation.  */

int optopt = '?';

/* Describe how to deal with options that follow non-option ARGV-elements.

   If the caller did not specify anything,

   the default is REQUIRE_ORDER if the environment variable

   POSIXLY_CORRECT is defined, PERMUTE otherwise.

   REQUIRE_ORDER means don't recognize them as options;

   stop option processing when the first non-option is seen.

   This is what Unix does.

   This mode of operation is selected by either setting the environment

   variable POSIXLY_CORRECT, or using `+' as the first character

   of the list of option characters.

   PERMUTE is the default.  We permute the contents of ARGV as we scan,

   so that eventually all the non-options are at the end.  This allows options

   to be given in any order, even with programs that were not written to

   expect this.

   RETURN_IN_ORDER is an option available to programs that were written

   to expect options and other ARGV-elements in any order and that care about

   the ordering of the two.  We describe each non-option ARGV-element

   as if it were the argument of an option with character code 1.

   Using `-' as the first character of the list of option characters

   selects this mode of operation.

   The special argument `--' forces an end of option-scanning regardless

   of the value of `ordering'.  In the case of RETURN_IN_ORDER, only

   `--' can cause `getopt' to return EOF with `optind' != ARGC.  */

static enum

{

  REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER

} ordering;

/* Value of POSIXLY_CORRECT environment variable.  */

static char *posixly_correct;

#ifdef	__GNU_LIBRARY__

/* We want to avoid inclusion of string.h with non-GNU libraries

   because there are many ways it can cause trouble.

   On some systems, it contains special magic macros that don't work

   in GCC.  */

#include <string.h>

#define	my_index	strchr

#else

/* Avoid depending on library functions or files

   whose names are inconsistent.  */

char *getenv ();

static char *

my_index (str, chr)

     const char *str;

     int chr;

{

  while (*str)

    {

      if (*str == chr)

	return (char *) str;

      str++;

    }

  return 0;

}

/* If using GCC, we can safely declare strlen this way.

   If not using GCC, it is ok not to declare it.  */

#ifdef __GNUC__

/* Note that Motorola Delta 68k R3V7 comes with GCC but not stddef.h.

   That was relevant to code that was here before.  */

#ifndef __STDC__

/* gcc with -traditional declares the built-in strlen to return int,

   and has done so at least since version 2.4.5. -- rms.  */

extern int strlen (const char *);

#endif /* not __STDC__ */

#endif /* __GNUC__ */

#endif /* not __GNU_LIBRARY__ */

/* Handle permutation of arguments.  */

/* Describe the part of ARGV that contains non-options that have

   been skipped.  `first_nonopt' is the index in ARGV of the first of them;

   `last_nonopt' is the index after the last of them.  */

static int first_nonopt;

static int last_nonopt;

/* Exchange two adjacent subsequences of ARGV.

   One subsequence is elements [first_nonopt,last_nonopt)

   which contains all the non-options that have been skipped so far.

   The other is elements [last_nonopt,optind), which contains all

   the options processed since those non-options were skipped.

   `first_nonopt' and `last_nonopt' are relocated so that they describe

   the new indices of the non-options in ARGV after they are moved.  */

static void

exchange (argv)

     char **argv;

{

  int bottom = first_nonopt;

  int middle = last_nonopt;

  int top = optind;

  char *tem;

  /* Exchange the shorter segment with the far end of the longer segment.

     That puts the shorter segment into the right place.

     It leaves the longer segment in the right place overall,

     but it consists of two parts that need to be swapped next.  */

  while (top > middle && middle > bottom)

    {

      if (top - middle > middle - bottom)

	{

	  /* Bottom segment is the short one.  */

	  int len = middle - bottom;

	  register int i;

	  /* Swap it with the top part of the top segment.  */

	  for (i = 0; i < len; i++)

	    {

	      tem = argv[bottom + i];

	      argv[bottom + i] = argv[top - (middle - bottom) + i];

	      argv[top - (middle - bottom) + i] = tem;

	    }

	  /* Exclude the moved bottom segment from further swapping.  */

	  top -= len;

	}

      else

	{

	  /* Top segment is the short one.  */

	  int len = top - middle;

	  register int i;

	  /* Swap it with the bottom part of the bottom segment.  */

	  for (i = 0; i < len; i++)

	    {

	      tem = argv[bottom + i];

	      argv[bottom + i] = argv[middle + i];

	      argv[middle + i] = tem;

	    }

	  /* Exclude the moved top segment from further swapping.  */

	  bottom += len;

	}

    }

  /* Update records for the slots the non-options now occupy.  */

  first_nonopt += (optind - last_nonopt);

  last_nonopt = optind;

}

/* Initialize the internal data when the first call is made.  */

static const char *

_getopt_initialize (optstring)

     const char *optstring;

{

  /* Start processing options with ARGV-element 1 (since ARGV-element 0

     is the program name); the sequence of previously skipped

     non-option ARGV-elements is empty.  */

  first_nonopt = last_nonopt = optind = 1;

  nextchar = NULL;

  posixly_correct = getenv ("POSIXLY_CORRECT");

  /* Determine how to handle the ordering of options and nonoptions.  */

  if (optstring[0] == '-')

    {

      ordering = RETURN_IN_ORDER;

      ++optstring;

    }

  else if (optstring[0] == '+')

    {

      ordering = REQUIRE_ORDER;

      ++optstring;

    }

  else if (posixly_correct != NULL)

    ordering = REQUIRE_ORDER;

  else

    ordering = PERMUTE;

  return optstring;

}

/* Scan elements of ARGV (whose length is ARGC) for option characters

   given in OPTSTRING.

   If an element of ARGV starts with '-', and is not exactly "-" or "--",

   then it is an option element.  The characters of this element

   (aside from the initial '-') are option characters.  If `getopt'

   is called repeatedly, it returns successively each of the option characters

   from each of the option elements.

   If `getopt' finds another option character, it returns that character,

   updating `optind' and `nextchar' so that the next call to `getopt' can

   resume the scan with the following option character or ARGV-element.

   If there are no more option characters, `getopt' returns `EOF'.

   Then `optind' is the index in ARGV of the first ARGV-element

   that is not an option.  (The ARGV-elements have been permuted

   so that those that are not options now come last.)

   OPTSTRING is a string containing the legitimate option characters.

   If an option character is seen that is not listed in OPTSTRING,

   return '?' after printing an error message.  If you set `opterr' to

   zero, the error message is suppressed but we still return '?'.

   If a char in OPTSTRING is followed by a colon, that means it wants an arg,

   so the following text in the same ARGV-element, or the text of the following

   ARGV-element, is returned in `optarg'.  Two colons mean an option that

   wants an optional arg; if there is text in the current ARGV-element,

   it is returned in `optarg', otherwise `optarg' is set to zero.

   If OPTSTRING starts with `-' or `+', it requests different methods of

   handling the non-option ARGV-elements.

   See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above.

   Long-named options begin with `--' instead of `-'.

   Their names may be abbreviated as long as the abbreviation is unique

   or is an exact match for some defined option.  If they have an

   argument, it follows the option name in the same ARGV-element, separated

   from the option name by a `=', or else the in next ARGV-element.

   When `getopt' finds a long-named option, it returns 0 if that option's

   `flag' field is nonzero, the value of the option's `val' field

   if the `flag' field is zero.

   The elements of ARGV aren't really const, because we permute them.

   But we pretend they're const in the prototype to be compatible

   with other systems.

   LONGOPTS is a vector of `struct option' terminated by an

   element containing a name which is zero.

   LONGIND returns the index in LONGOPT of the long-named option found.

   It is only valid when a long-named option has been found by the most

   recent call.

   If LONG_ONLY is nonzero, '-' as well as '--' can introduce

   long-named options.  */

int

_getopt_internal (argc, argv, optstring, longopts, longind, long_only)

     int argc;

     char *const *argv;

     const char *optstring;

     const struct option *longopts;

     int *longind;

     int long_only;

{

  optarg = NULL;

  if (optind == 0)

    optstring = _getopt_initialize (optstring);

  if (nextchar == NULL || *nextchar == '\0')

    {

      /* Advance to the next ARGV-element.  */

      if (ordering == PERMUTE)

	{

	  /* If we have just processed some options following some non-options,

	     exchange them so that the options come first.  */

	  if (first_nonopt != last_nonopt && last_nonopt != optind)

	    exchange ((char **) argv);

	  else if (last_nonopt != optind)

	    first_nonopt = optind;

	  /* Skip any additional non-options

	     and extend the range of non-options previously skipped.  */

	  while (optind < argc

		 && (argv[optind][0] != '-' || argv[optind][1] == '\0'))

	    optind++;

	  last_nonopt = optind;

	}

      /* The special ARGV-element `--' means premature end of options.

	 Skip it like a null option,

	 then exchange with previous non-options as if it were an option,

	 then skip everything else like a non-option.  */

      if (optind != argc && !strcmp (argv[optind], "--"))

	{

	  optind++;

	  if (first_nonopt != last_nonopt && last_nonopt != optind)

	    exchange ((char **) argv);

	  else if (first_nonopt == last_nonopt)

	    first_nonopt = optind;

	  last_nonopt = argc;

	  optind = argc;

	}

      /* If we have done all the ARGV-elements, stop the scan

	 and back over any non-options that we skipped and permuted.  */

      if (optind == argc)

	{

	  /* Set the next-arg-index to point at the non-options

	     that we previously skipped, so the caller will digest them.  */

	  if (first_nonopt != last_nonopt)

	    optind = first_nonopt;

	  return EOF;

	}

      /* If we have come to a non-option and did not permute it,

	 either stop the scan or describe it to the caller and pass it by.  */

      if ((argv[optind][0] != '-' || argv[optind][1] == '\0'))

	{

	  if (ordering == REQUIRE_ORDER)

	    return EOF;

	  optarg = argv[optind++];

	  return 1;

	}

      /* We have found another option-ARGV-element.

	 Skip the initial punctuation.  */

      nextchar = (argv[optind] + 1

		  + (longopts != NULL && argv[optind][1] == '-'));

    }

  /* Decode the current option-ARGV-element.  */

  /* Check whether the ARGV-element is a long option.

     If long_only and the ARGV-element has the form "-f", where f is

     a valid short option, don't consider it an abbreviated form of

     a long option that starts with f.  Otherwise there would be no

     way to give the -f short option.

     On the other hand, if there's a long option "fubar" and

     the ARGV-element is "-fu", do consider that an abbreviation of

     the long option, just like "--fu", and not "-f" with arg "u".

     This distinction seems to be the most useful approach.  */

  if (longopts != NULL

      && (argv[optind][1] == '-'

	  || (long_only && (argv[optind][2] || !my_index (optstring, argv[optind][1])))))

    {

      char *nameend;

      const struct option *p;

      const struct option *pfound = NULL;

      int exact = 0;

      int ambig = 0;

      int indfound;

      int option_index;

      for (nameend = nextchar; *nameend && *nameend != '='; nameend++)

	/* Do nothing.  */ ;

      /* Test all long options for either exact match

	 or abbreviated matches.  */

      for (p = longopts, option_index = 0; p->name; p++, option_index++)

	if (!strncmp (p->name, nextchar, nameend - nextchar))

	  {

	    if (nameend - nextchar == strlen (p->name))

	      {

		/* Exact match found.  */

		pfound = p;

		indfound = option_index;

		exact = 1;

		break;

	      }

	    else if (pfound == NULL)

	      {

		/* First nonexact match found.  */

		pfound = p;

		indfound = option_index;

	      }

	    else

	      /* Second or later nonexact match found.  */

	      ambig = 1;

	  }

      if (ambig && !exact)

	{

	  if (opterr)

	    fprintf (stderr, "%s: option `%s' is ambiguous\n",

		     argv[0], argv[optind]);

	  nextchar += strlen (nextchar);

	  optind++;

	  return '?';

	}

      if (pfound != NULL)

	{

	  option_index = indfound;

	  optind++;

	  if (*nameend)

	    {

	      /* Don't test has_arg with >, because some C compilers don't

		 allow it to be used on enums.  */

	      if (pfound->has_arg)

		optarg = nameend + 1;

	      else

		{

		  if (opterr)

		    {

		      if (argv[optind - 1][1] == '-')

			/* --option */

			fprintf (stderr,

				 "%s: option `--%s' doesn't allow an argument\n",

				 argv[0], pfound->name);

		      else

			/* +option or -option */

			fprintf (stderr,

			     "%s: option `%c%s' doesn't allow an argument\n",

			     argv[0], argv[optind - 1][0], pfound->name);

		    }

		  nextchar += strlen (nextchar);

		  return '?';

		}

	    }

	  else if (pfound->has_arg == 1)

	    {

	      if (optind < argc)

		optarg = argv[optind++];

	      else

		{

		  if (opterr)

		    fprintf (stderr, "%s: option `%s' requires an argument\n",

			     argv[0], argv[optind - 1]);

		  nextchar += strlen (nextchar);

		  return optstring[0] == ':' ? ':' : '?';

		}

	    }

	  nextchar += strlen (nextchar);

	  if (longind != NULL)

	    *longind = option_index;

	  if (pfound->flag)

	    {

	      *(pfound->flag) = pfound->val;

	      return 0;

	    }

	  return pfound->val;

	}

      /* Can't find it as a long option.  If this is not getopt_long_only,

	 or the option starts with '--' or is not a valid short

	 option, then it's an error.

	 Otherwise interpret it as a short option.  */

      if (!long_only || argv[optind][1] == '-'

	  || my_index (optstring, *nextchar) == NULL)

	{

	  if (opterr)

	    {

	      if (argv[optind][1] == '-')

		/* --option */

		fprintf (stderr, "%s: unrecognized option `--%s'\n",

			 argv[0], nextchar);

	      else

		/* +option or -option */

		fprintf (stderr, "%s: unrecognized option `%c%s'\n",

			 argv[0], argv[optind][0], nextchar);

	    }

	  nextchar = (char *) "";

	  optind++;

	  return '?';

	}

    }

  /* Look at and handle the next short option-character.  */

  {

    char c = *nextchar++;

    char *temp = my_index (optstring, c);

    /* Increment `optind' when we start to process its last character.  */

    if (*nextchar == '\0')

      ++optind;

    if (temp == NULL || c == ':')

      {

	if (opterr)

	  {

	    if (posixly_correct)

	      /* 1003.2 specifies the format of this message.  */

	      fprintf (stderr, "%s: illegal option -- %c\n", argv[0], c);

	    else

	      fprintf (stderr, "%s: invalid option -- %c\n", argv[0], c);

	  }

	optopt = c;

	return '?';

      }

    if (temp[1] == ':')

      {

	if (temp[2] == ':')

	  {

	    /* This is an option that accepts an argument optionally.  */

	    if (*nextchar != '\0')

	      {

		optarg = nextchar;

		optind++;

	      }

	    else

	      optarg = NULL;

	    nextchar = NULL;

	  }

	else

	  {

	    /* This is an option that requires an argument.  */

	    if (*nextchar != '\0')

	      {

		optarg = nextchar;

		/* If we end this ARGV-element by taking the rest as an arg,

		   we must advance to the next element now.  */

		optind++;

	      }

	    else if (optind == argc)

	      {

		if (opterr)

		  {

		    /* 1003.2 specifies the format of this message.  */

		    fprintf (stderr, "%s: option requires an argument -- %c\n",

			     argv[0], c);

		  }

		optopt = c;

		if (optstring[0] == ':')

		  c = ':';

		else

		  c = '?';

	      }

	    else

	      /* We already incremented `optind' once;

		 increment it again when taking next ARGV-elt as argument.  */

	      optarg = argv[optind++];

	    nextchar = NULL;

	  }

      }

    return c;

  }

}

int

getopt (argc, argv, optstring)

     int argc;

     char *const *argv;

     const char *optstring;

{

  return _getopt_internal (argc, argv, optstring,

			   (const struct option *) 0,

			   (int *) 0,

			   0);

}

#endif	/* _LIBC or not __GNU_LIBRARY__.  */

#ifdef TEST

/* Compile with -DTEST to make an executable for use in testing

   the above definition of `getopt'.  */

int

main (argc, argv)

     int argc;

     char **argv;

{

  int c;

  int digit_optind = 0;

  while (1)

    {

      int this_option_optind = optind ? optind : 1;

      c = getopt (argc, argv, "abc:d:0123456789");

      if (c == EOF)

	break;

      switch (c)

	{

	case '0':

	case '1':

	case '2':

	case '3':

	case '4':

	case '5':

	case '6':

	case '7':

	case '8':

	case '9':

	  if (digit_optind != 0 && digit_optind != this_option_optind)

	    printf ("digits occur in two different argv-elements.\n");

	  digit_optind = this_option_optind;

	  printf ("option %c\n", c);

	  break;

	case 'a':

	  printf ("option a\n");

	  break;

	case 'b':

	  printf ("option b\n");

	  break;

	case 'c':

	  printf ("option c with value `%s'\n", optarg);

	  break;

	case '?':

	  break;

	default:

	  printf ("?? getopt returned character code 0%o ??\n", c);

	}

    }

  if (optind < argc)

    {

      printf ("non-option ARGV-elements: ");

      while (optind < argc)

	printf ("%s ", argv[optind++]);

      printf ("\n");

    }

  exit (0);

}

#endif /* TEST */