File indexing completed on 2025-02-02 04:10:07

 /* Declarations for getopt.
    Copyright (C) 1989,90,91,92,93,94,96,97,98,99 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 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., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.  */
 
 #ifndef _GETOPT_H
 
 #ifndef __need_getopt
 # define _GETOPT_H 1
 #endif
 
 /* 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__
   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__
 # 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 /* getopt.h */