/* Declarations for getopt.   Copyright (C) 1989-2026 Free Software Foundation, Inc.    NOTE: The canonical source of this file is maintained with the GNU C Library.   Bugs can be reported to bug-glibc@gnu.org.    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 Street - Fifth Floor, Boston, MA 02110-1301,   USA.  */ #ifndef _GETOPT_H#define _GETOPT_H 1 #ifdef	__cplusplusextern "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; /* 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__/* HAVE_DECL_* is a three-state macro: undefined, 0 or 1.  If it is   undefined, we haven't run the autoconf check so provide the   declaration without arguments.  If it is 0, we checked and failed   to find the declaration so provide a fully prototyped one.  If it   is 1, we found it so don't provide any declaration at all.  */#if !HAVE_DECL_GETOPT#if defined (__GNU_LIBRARY__) || defined (HAVE_DECL_GETOPT)/* Many other libraries have conflicting prototypes for getopt, with   differences in the consts, in unistd.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#ifndef __cplusplusextern int getopt ();#endif /* __cplusplus */#endif#endif /* !HAVE_DECL_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);#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 */