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97 lines
3.6 KiB
C
97 lines
3.6 KiB
C
/* Declarations for getopt (basic, portable features only).
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser 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_CORE_H
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#define _GETOPT_CORE_H 1
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/* This header should not be used directly; include getopt.h or
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unistd.h instead. Unlike most bits headers, it does not have
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a protective #error, because the guard macro for getopt.h in
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gnulib is not fixed. */
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__BEGIN_DECLS
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/* For communication from 'getopt' to the caller.
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When 'getopt' finds an option that takes an argument,
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the argument value is returned here.
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Also, when 'ordering' is RETURN_IN_ORDER,
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each non-option ARGV-element is returned here. */
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extern char *optarg;
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/* Index in ARGV of the next element to be scanned.
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This is used for communication to and from the caller
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and for communication between successive calls to 'getopt'.
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On entry to 'getopt', zero means this is the first call; initialize.
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When 'getopt' returns -1, this is the index of the first of the
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non-option elements that the caller should itself scan.
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Otherwise, 'optind' communicates from one call to the next
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how much of ARGV has been scanned so far. */
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extern int optind;
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/* Callers store zero here to inhibit the error message 'getopt' prints
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for unrecognized options. */
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extern int opterr;
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/* Set to an option character which was unrecognized. */
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extern int optopt;
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/* Get definitions and prototypes for functions to process the
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arguments in ARGV (ARGC of them, minus the program name) for
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options given in OPTS.
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Return the option character from OPTS just read. Return -1 when
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there are no more options. For unrecognized options, or options
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missing arguments, 'optopt' is set to the option letter, and '?' is
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returned.
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The OPTS string is a list of characters which are recognized option
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letters, optionally followed by colons, specifying that that letter
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takes an argument, to be placed in 'optarg'.
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If a letter in OPTS is followed by two colons, its argument is
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optional. This behavior is specific to the GNU 'getopt'.
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The argument '--' causes premature termination of argument
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scanning, explicitly telling 'getopt' that there are no more
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options.
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If OPTS begins with '-', then non-option arguments are treated as
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arguments to the option '\1'. This behavior is specific to the GNU
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'getopt'. If OPTS begins with '+', or POSIXLY_CORRECT is set in
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the environment, then do not permute arguments.
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For standards compliance, the 'argv' argument has the type
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char *const *, but this is inaccurate; if argument permutation is
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enabled, the argv array (not the strings it points to) must be
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writable. */
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extern int getopt (int ___argc, char *const *___argv, const char *__shortopts)
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__THROW __nonnull ((2, 3));
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__END_DECLS
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#endif /* getopt_core.h */
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