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Edit File: getopt_ext.h
/* Declarations for getopt (GNU extensions). Copyright (C) 1989-2021 Free Software Foundation, Inc. This file is part of the GNU C Library and is also part of gnulib. Patches to this file should be submitted to both projects. 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, see <https://www.gnu.org/licenses/>. */ #ifndef _GETOPT_EXT_H #define _GETOPT_EXT_H 1 /* This header should not be used directly; include getopt.h instead. Unlike most bits headers, it does not have a protective #error, because the guard macro for getopt.h in gnulib is not fixed. */ __BEGIN_DECLS /* 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 { const char *name; /* 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 extern int getopt_long (int ___argc, char *__getopt_argv_const *___argv, const char *__shortopts, const struct option *__longopts, int *__longind) __THROW __nonnull ((2, 3)); extern int getopt_long_only (int ___argc, char *__getopt_argv_const *___argv, const char *__shortopts, const struct option *__longopts, int *__longind) __THROW __nonnull ((2, 3)); __END_DECLS #endif /* getopt_ext.h */