## root/libglibc/getopt.h(270.html)

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    /* Declarations for getopt.
       Copyright (C) 1989, 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, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA.  */

    #ifndef _GETOPT_H
    #define _GETOPT_H 1

    #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 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.  */

    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;

    /* 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__
      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

    #if defined (__STDC__) && __STDC__
    #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__ */
    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);
    #else /* not __STDC__ */
    extern int getopt ();
    extern int getopt_long ();
    extern int getopt_long_only ();

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

    #ifdef  __cplusplus
    }
    #endif

    #endif /* _GETOPT_H */

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