dhcpd-pools  3.0
ISC dhcpd lease usage analyser
getopt-core.h
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1 /* Declarations for getopt (basic, portable features only).
2  Copyright (C) 1989-2017 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 General Public
8  License as published by the Free Software Foundation; either
9  version 3 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  General Public License for more details.
15 
16  You should have received a copy of the GNU 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 
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 
36 extern 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 
50 extern int optind;
51 
52 /* Callers store zero here to inhibit the error message 'getopt' prints
53  for unrecognized options. */
54 
55 extern int opterr;
56 
57 /* Set to an option character which was unrecognized. */
58 
59 extern 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 
91 extern int getopt (int ___argc, char *const *___argv, const char *__shortopts)
92  __THROW _GL_ARG_NONNULL ((2, 3));
93 
95 
96 #endif /* _GETOPT_CORE_H */
#define __END_DECLS
Definition: getopt-cdefs.in.h:46
int optopt
Definition: getopt.c:115
__BEGIN_DECLS char * optarg
Definition: getopt.c:89
_GL_ARG_NONNULL((1)))
#define __THROW
Definition: getopt-cdefs.in.h:63
int optind
Definition: getopt.c:104
int opterr
Definition: getopt.c:109
int getopt(int ___argc, char *const *___argv, const char *__shortopts) __THROW _GL_ARG_NONNULL((2
#define __BEGIN_DECLS
Definition: getopt-cdefs.in.h:39