78 lines
3.0 KiB
C
78 lines
3.0 KiB
C
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/* Declarations for getopt (GNU extensions).
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Copyright (C) 1989-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library and is also part of gnulib.
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Patches to this file should be submitted to both projects.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _GETOPT_EXT_H
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#define _GETOPT_EXT_H 1
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/* This header should not be used directly; include getopt.h instead.
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Unlike most bits headers, it does not have a protective #error,
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because the guard macro for getopt.h in gnulib is not fixed. */
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__BEGIN_DECLS
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/* Describe the long-named options requested by the application.
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The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
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of 'struct option' terminated by an element containing a name which is
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zero.
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The field 'has_arg' is:
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no_argument (or 0) if the option does not take an argument,
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required_argument (or 1) if the option requires an argument,
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optional_argument (or 2) if the option takes an optional argument.
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If the field 'flag' is not NULL, it points to a variable that is set
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to the value given in the field 'val' when the option is found, but
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left unchanged if the option is not found.
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To have a long-named option do something other than set an 'int' to
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a compiled-in constant, such as set a value from 'optarg', set the
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option's 'flag' field to zero and its 'val' field to a nonzero
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value (the equivalent single-letter option character, if there is
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one). For long options that have a zero 'flag' field, 'getopt'
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returns the contents of the 'val' field. */
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struct option
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{
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const char *name;
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/* has_arg can't be an enum because some compilers complain about
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type mismatches in all the code that assumes it is an int. */
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int has_arg;
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int *flag;
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int val;
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};
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/* Names for the values of the 'has_arg' field of 'struct option'. */
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#define no_argument 0
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#define required_argument 1
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#define optional_argument 2
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extern int getopt_long (int ___argc, char *__getopt_argv_const *___argv,
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const char *__shortopts,
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const struct option *__longopts, int *__longind)
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__THROW _GL_ARG_NONNULL ((2, 3));
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extern int getopt_long_only (int ___argc, char *__getopt_argv_const *___argv,
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const char *__shortopts,
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const struct option *__longopts, int *__longind)
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__THROW _GL_ARG_NONNULL ((2, 3));
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__END_DECLS
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#endif /* _GETOPT_EXT_H */
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