getopt.h

/* Declarations for getopt.
   Copyright (C) 1989-1994, 1996-1999, 2001 Free Software
   Foundation, Inc. This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute
   it and/or modify it under the terms of the GNU Lesser
   General Public License as published by the Free Software
   Foundation; either version 2.1 of the License, or
   (at your option) any later version.

   The GNU C Library 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 Lesser General Public
   License for more details.

   You should have received a copy of the GNU Lesser General
   Public License along with the GNU C Library; if not, write
   to the Free Software Foundation, Inc., 59 Temple Place,
   Suite 330, Boston, MA 02111-1307 USA.  */

#ifndef _stir_GETOPT_H
#define _stir_GETOPT_H

#ifdef HAVE_SYSTEM_GETOPT

/* use system getopt */
#  include <getopt.h>

#else

/* If __GNU_LIBRARY__ is not already defined, either we are being used
   standalone, or this is the first header included in the source file.
   If we are being used with glibc, we need to include <features.h>, but
   that does not exist if we are standalone.  So: if __GNU_LIBRARY__ is
   not defined, include <ctype.h>, which will pull in <features.h> for us
   if it's from glibc.  (Why ctype.h?  It's guaranteed to exist and it
   doesn't flood the namespace with stuff the way some other headers do.)  */
#  if !defined __GNU_LIBRARY__
#    include <ctype.h>
#  endif

#  ifdef __cplusplus
extern "C"
{
#  endif

  /* 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.  */

  extern char* optarg;

  /* 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 -1, 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.  */

  extern int optind;

  /* Callers store zero here to inhibit the error message `getopt' prints
     for unrecognized options.  */

  extern int opterr;

  /* Set to an option character which was unrecognized.  */

  extern int optopt;

#  ifndef __need_getopt
  /* Describe the long-named options requested by the application.
     The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
     of `struct option' terminated by an element containing a name which is
     zero.

     The field `has_arg' is:
     no_argument          (or 0) if the option does not take an argument,
     required_argument    (or 1) if the option requires an argument,
     optional_argument    (or 2) if the option takes an optional argument.

     If the field `flag' is not NULL, it points to a variable that is set
     to the value given in the field `val' when the option is found, but
     left unchanged if the option is not found.

     To have a long-named option do something other than set an `int' to
     a compiled-in constant, such as set a value from `optarg', set the
     option's `flag' field to zero and its `val' field to a nonzero
     value (the equivalent single-letter option character, if there is
     one).  For long options that have a zero `flag' field, `getopt'
     returns the contents of the `val' field.  */

  struct option
  {
#    if (defined __STDC__ && __STDC__) || defined __cplusplus
    const char* name;
#    else
    char* name;
#    endif
    /* has_arg can't be an enum because some compilers complain about
       type mismatches in all the code that assumes it is an int.  */
    int has_arg;
    int* flag;
    int val;
  };

  /* Names for the values of the `has_arg' field of `struct option'.  */

#    define no_argument 0
#    define required_argument 1
#    define optional_argument 2
#  endif /* need getopt */

  /* Get definitions and prototypes for functions to process the
     arguments in ARGV (ARGC of them, minus the program name) for
     options given in OPTS.

     Return the option character from OPTS just read.  Return -1 when
     there are no more options.  For unrecognized options, or options
     missing arguments, `optopt' is set to the option letter, and '?' is
     returned.

     The OPTS string is a list of characters which are recognized option
     letters, optionally followed by colons, specifying that that letter
     takes an argument, to be placed in `optarg'.

     If a letter in OPTS is followed by two colons, its argument is
     optional.  This behavior is specific to the GNU `getopt'.

     The argument `--' causes premature termination of argument
     scanning, explicitly telling `getopt' that there are no more
     options.

     If OPTS begins with `--', then non-option arguments are treated as
     arguments to the option '\0'.  This behavior is specific to the GNU
     `getopt'.  */

#  if (defined __STDC__ && __STDC__) || defined __cplusplus
  //# ifdef __GNU_LIBRARY__
  /* Many other libraries have conflicting prototypes for getopt, with
     differences in the consts, in stdlib.h.  To avoid compilation
     errors, only prototype getopt for the GNU C library.  */
  extern int getopt(int ___argc, char* const* ___argv, const char* __shortopts);
  //# else /* not __GNU_LIBRARY__ */
  // extern int getopt ();
  //# endif /* __GNU_LIBRARY__ */

#    ifndef __need_getopt
  extern int
  getopt_long(int ___argc, char* const* ___argv, const char* __shortopts, const struct option* __longopts, int* __longind);
  extern int
  getopt_long_only(int ___argc, char* const* ___argv, const char* __shortopts, const struct option* __longopts, int* __longind);

  /* Internal only.  Users should not call this directly.  */
  extern int _getopt_internal(int ___argc,
                              char* const* ___argv,
                              const char* __shortopts,
                              const struct option* __longopts,
                              int* __longind,
                              int __long_only);
#    endif
#  else /* not __STDC__ */
extern int getopt();
#    ifndef __need_getopt
extern int getopt_long();
extern int getopt_long_only();

extern int _getopt_internal();
#    endif
#  endif /* __STDC__ */

#  ifdef __cplusplus
}
#  endif

/* Make sure we later can get all the definitions and declarations.  */
#  undef __need_getopt

#endif /* HAVE_SYSTEM_GETOPT */

#endif /* getopt.h */