1/* Declarations for getopt (basic, portable features only). 
2 Copyright (C) 1989-2020 Free Software Foundation, Inc. 
3 This file is part of the GNU C Library and is also part of gnulib. 
4 Patches to this file should be submitted to both projects. 
5 
6 The GNU C Library is free software; you can redistribute it and/or 
7 modify it under the terms of the GNU Lesser General Public 
8 License as published by the Free Software Foundation; either 
9 version 2.1 of the License, or (at your option) any later version. 
10 
11 The GNU C Library is distributed in the hope that it will be useful, 
12 but WITHOUT ANY WARRANTY; without even the implied warranty of 
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
14 Lesser General Public License for more details. 
15 
16 You should have received a copy of the GNU Lesser General Public 
17 License along with the GNU C Library; if not, see 
18 <https://www.gnu.org/licenses/>. */ 
19 
20#ifndef _GETOPT_CORE_H 
21#define _GETOPT_CORE_H 1 
22 
23/* This header should not be used directly; include getopt.h or 
24 unistd.h instead. Unlike most bits headers, it does not have 
25 a protective #error, because the guard macro for getopt.h in 
26 gnulib is not fixed. */ 
27 
28__BEGIN_DECLS 
29 
30/* For communication from 'getopt' to the caller. 
31 When 'getopt' finds an option that takes an argument, 
32 the argument value is returned here. 
33 Also, when 'ordering' is RETURN_IN_ORDER, 
34 each non-option ARGV-element is returned here. */ 
35 
36extern char *optarg; 
37 
38/* Index in ARGV of the next element to be scanned. 
39 This is used for communication to and from the caller 
40 and for communication between successive calls to 'getopt'. 
41 
42 On entry to 'getopt', zero means this is the first call; initialize. 
43 
44 When 'getopt' returns -1, this is the index of the first of the 
45 non-option elements that the caller should itself scan. 
46 
47 Otherwise, 'optind' communicates from one call to the next 
48 how much of ARGV has been scanned so far. */ 
49 
50extern int optind; 
51 
52/* Callers store zero here to inhibit the error message 'getopt' prints 
53 for unrecognized options. */ 
54 
55extern int opterr; 
56 
57/* Set to an option character which was unrecognized. */ 
58 
59extern int optopt; 
60 
61/* Get definitions and prototypes for functions to process the 
62 arguments in ARGV (ARGC of them, minus the program name) for 
63 options given in OPTS. 
64 
65 Return the option character from OPTS just read. Return -1 when 
66 there are no more options. For unrecognized options, or options 
67 missing arguments, 'optopt' is set to the option letter, and '?' is 
68 returned. 
69 
70 The OPTS string is a list of characters which are recognized option 
71 letters, optionally followed by colons, specifying that that letter 
72 takes an argument, to be placed in 'optarg'. 
73 
74 If a letter in OPTS is followed by two colons, its argument is 
75 optional. This behavior is specific to the GNU 'getopt'. 
76 
77 The argument '--' causes premature termination of argument 
78 scanning, explicitly telling 'getopt' that there are no more 
79 options. 
80 
81 If OPTS begins with '-', then non-option arguments are treated as 
82 arguments to the option '\1'. This behavior is specific to the GNU 
83 'getopt'. If OPTS begins with '+', or POSIXLY_CORRECT is set in 
84 the environment, then do not permute arguments. 
85 
86 For standards compliance, the 'argv' argument has the type 
87 char *const *, but this is inaccurate; if argument permutation is 
88 enabled, the argv array (not the strings it points to) must be 
89 writable. */ 
90 
91extern int getopt (int ___argc, char *const *___argv, const char *__shortopts) 
92 __THROW __nonnull ((2, 3)); 
93 
94__END_DECLS 
95 
96#endif /* getopt_core.h */ 
97