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+/** \file wgetopt.h
+  A version of the getopt library for use with wide character strings.
+
+  This is simply the gnu getopt library, but converted for use with
+  wchar_t instead of char. This is not usually useful since the argv
+  array is always defined to be of type char**, but in fish, all
+  internal commands use wide characters and hence this library is
+  useful.
+
+  If you want to use this version of getopt in your program,
+  download the fish sourcecode, available at <a
+  href='http://fishshell.com'>the fish homepage</a>. Extract
+  the sourcode, copy wgetopt.c and wgetopt.h into your program
+  directory, include wgetopt.h in your program, and use all the
+  regular getopt functions, prefixing every function, global
+  variable and structure with a 'w', and use only wide character
+  strings. There are no other functional changes in this version of
+  getopt besides using wide character strings.
+
+  For examples of how to use wgetopt, see the fish builtin
+  functions, many of which are defined in builtin.c.
+
+*/
+
+
+/* Declarations for getopt.
+   Copyright (C) 1989, 90, 91, 92, 93, 94 Free Software Foundation, Inc.
+
+This file is part of the GNU C Library.  Its master source is NOT part of
+the C library, however.  The master source lives in /gd/gnu/lib.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#ifndef FISH_WGETOPT_H
+#define FISH_WGETOPT_H
+
+#include <wchar.h>
+
+#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 wchar_t *woptarg;
+
+    /** 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, `woptind' communicates from one call to the next
+       how much of ARGV has been scanned so far.  */
+
+    extern int woptind;
+
+    /** Callers store zero here to inhibit the error message `getopt' prints
+       for unrecognized options.  */
+
+    extern int wopterr;
+
+    /** Set to an option character which was unrecognized.  */
+
+    extern int woptopt;
+
+    /** 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 woption
+    {
+        /**
+           long name for switch
+        */
+#if defined (__STDC__) && __STDC__
+        const wchar_t *name;
+#else
+        wchar_t *name;
+#endif
+        /**
+          Must be one of no_argument, required_argument and
+          optional_argument.
+
+          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;
+
+        /**
+          If non-null, the flag whose value should be set if this switch is encountered
+        */
+        int *flag;
+
+        /**
+          If \c flag is non-null, this is the value that flag will be set
+          to. Otherwise, this is the return-value of the function call.
+        */
+        int val;
+    };
+
+    /* Names for the values of the `has_arg' field of `struct option'.  */
+
+    /**
+       Specifies that a switch does not accept an argument
+    */
+#define  no_argument    0
+    /**
+       Specifies that a switch requires an argument
+    */
+#define required_argument  1
+    /**
+       Specifies that a switch accepts an optional argument
+    */
+#define optional_argument  2
+
+#if defined (__STDC__) && __STDC__
+#ifdef __GNU_LIBRARY__
+    /**
+      Get options from argument list. See the glibc manual for information on how to use this function.
+    */
+    extern int wgetopt(int argc, wchar_t *const *argv, const wchar_t *shortopts);
+#else /* not __GNU_LIBRARY__ */
+
+    extern int wgetopt();
+#endif /* __GNU_LIBRARY__ */
+    /**
+      Get options from argument list. See the glibc manual for information on how to use this function.
+     */
+    extern int wgetopt_long(int argc, wchar_t *const *argv, const wchar_t *shortopts,
+                            const struct woption *longopts, int *longind);
+    /**
+      Get options from argument list. See the glibc manual for information on how to use this function.
+     */
+    extern int wgetopt_long_only(int argc, wchar_t *const *argv,
+                                 const wchar_t *shortopts,
+                                 const struct woption *longopts, int *longind);
+
+    /**
+      Internal only.  Users should not call this directly.
+    */
+    extern int _wgetopt_internal(int argc, wchar_t *const *argv,
+                                 const wchar_t *shortopts,
+                                 const struct woption *longopts, int *longind,
+                                 int long_only);
+#else /* not __STDC__ */
+
+    /**
+      Get options from argument list. See the glibc manual for information on how to use this function.
+     */
+    extern int wgetopt();
+
+    /**
+      Get options from argument list. See the glibc manual for information on how to use this function.
+     */
+    extern int wgetopt_long();
+
+    /**
+      Get options from argument list. See the glibc manual for information on how to use this function.
+     */
+    extern int wgetopt_long_only();
+
+    /**
+      Internal only.  Users should not call this directly.
+    */
+    extern int _wgetopt_internal();
+#endif /* __STDC__ */
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif /* FISH_WGETOPT_H */