1 /* Declarations for getopt.
2 Copyright (C) 1989-1994, 1996-1999, 2001 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
18 MA 02110-1301, USA */
19
20 #ifndef _GETOPT_H
21
22 #ifndef __need_getopt
23 # define _GETOPT_H 1
24 #endif
25
26 /* If __GNU_LIBRARY__ is not already defined, either we are being used
27 standalone, or this is the first header included in the source file.
28 If we are being used with glibc, we need to include <features.h>, but
29 that does not exist if we are standalone. So: if __GNU_LIBRARY__ is
30 not defined, include <ctype.h>, which will pull in <features.h> for us
31 if it's from glibc. (Why ctype.h? It's guaranteed to exist and it
32 doesn't flood the namespace with stuff the way some other headers do.) */
33 #if !defined __GNU_LIBRARY__
34 # include <ctype.h>
35 #endif
36
37 #ifdef __cplusplus
38 extern "C" {
39 #endif
40
41 /* For communication from `getopt' to the caller.
42 When `getopt' finds an option that takes an argument,
43 the argument value is returned here.
44 Also, when `ordering' is RETURN_IN_ORDER,
45 each non-option ARGV-element is returned here. */
46
47 extern char *optarg;
48
49 /* Index in ARGV of the next element to be scanned.
50 This is used for communication to and from the caller
51 and for communication between successive calls to `getopt'.
52
53 On entry to `getopt', zero means this is the first call; initialize.
54
55 When `getopt' returns -1, this is the index of the first of the
56 non-option elements that the caller should itself scan.
57
58 Otherwise, `optind' communicates from one call to the next
59 how much of ARGV has been scanned so far. */
60
61 extern int optind;
62
63 /* Callers store zero here to inhibit the error message `getopt' prints
64 for unrecognized options. */
65
66 extern int opterr;
67
68 /* Set to an option character which was unrecognized. */
69
70 extern int optopt;
71
72 #ifndef __need_getopt
73 /* Describe the long-named options requested by the application.
74 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
75 of `struct option' terminated by an element containing a name which is
76 zero.
77
78 The field `has_arg' is:
79 no_argument (or 0) if the option does not take an argument,
80 required_argument (or 1) if the option requires an argument,
81 optional_argument (or 2) if the option takes an optional argument.
82
83 If the field `flag' is not NULL, it points to a variable that is set
84 to the value given in the field `val' when the option is found, but
85 left unchanged if the option is not found.
86
87 To have a long-named option do something other than set an `int' to
88 a compiled-in constant, such as set a value from `optarg', set the
89 option's `flag' field to zero and its `val' field to a nonzero
90 value (the equivalent single-letter option character, if there is
91 one). For long options that have a zero `flag' field, `getopt'
92 returns the contents of the `val' field. */
93
94 struct option
95 {
96 # if (defined __STDC__ && __STDC__) || defined __cplusplus
97 const char *name;
98 # else
99 char *name;
100 # endif
101 /* has_arg can't be an enum because some compilers complain about
102 type mismatches in all the code that assumes it is an int. */
103 int has_arg;
104 int *flag;
105 int val;
106 };
107
108 /* Names for the values of the `has_arg' field of `struct option'. */
109
110 # define no_argument 0
111 # define required_argument 1
112 # define optional_argument 2
113 #endif /* need getopt */
114
115
116 /* Internal only. Users should not call this directly. */
117 extern int _getopt_internal (int ___argc, char *const *___argv,
118 const char *__shortopts,
119 const struct option *__longopts, int *__longind,
120 int __long_only);
121
122 #ifdef __cplusplus
123 }
124 #endif
125
126 /* Make sure we later can get all the definitions and declarations. */
127 #undef __need_getopt
128
129 #endif /* getopt.h */
130
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