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gnugetopt.h
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., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 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 /* Get definitions and prototypes for functions to process the
117 arguments in ARGV (ARGC of them, minus the program name) for
118 options given in OPTS.
119
120 Return the option character from OPTS just read. Return -1 when
121 there are no more options. For unrecognized options, or options
122 missing arguments, `optopt' is set to the option letter, and '?' is
123 returned.
124
125 The OPTS string is a list of characters which are recognized option
126 letters, optionally followed by colons, specifying that that letter
127 takes an argument, to be placed in `optarg'.
128
129 If a letter in OPTS is followed by two colons, its argument is
130 optional. This behavior is specific to the GNU `getopt'.
131
132 The argument `--' causes premature termination of argument
133 scanning, explicitly telling `getopt' that there are no more
134 options.
135
136 If OPTS begins with `--', then non-option arguments are treated as
137 arguments to the option '\0'. This behavior is specific to the GNU
138 `getopt'. */
139
140 #if (defined __STDC__ && __STDC__) || defined __cplusplus
141 # ifdef __GNU_LIBRARY__
142 /* Many other libraries have conflicting prototypes for getopt, with
143 differences in the consts, in stdlib.h. To avoid compilation
144 errors, only prototype getopt for the GNU C library. */
145 extern int getopt (int __argc, char *const *__argv, const char *__shortopts);
146 # else /* not __GNU_LIBRARY__ */
147 extern int getopt ();
148 # endif /* __GNU_LIBRARY__ */
149
150 # ifndef __need_getopt
151 extern int getopt_long (int __argc, char *const *__argv, const char *__shortopts,
152 const struct option *__longopts, int *__longind);
153 extern int getopt_long_only (int __argc, char *const *__argv,
154 const char *__shortopts,
155 const struct option *__longopts, int *__longind);
156
157 /* Internal only. Users should not call this directly. */
158 extern int _getopt_internal (int __argc, char *const *__argv,
159 const char *__shortopts,
160 const struct option *__longopts, int *__longind,
161 int __long_only);
162 # endif
163 #else /* not __STDC__ */
164 extern int getopt ();
165 # ifndef __need_getopt
166 extern int getopt_long ();
167 extern int getopt_long_only ();
168
169 extern int _getopt_internal ();
170 # endif
171 #endif /* __STDC__ */
172
173 #ifdef __cplusplus
174 }
175 #endif
176
177 /* Make sure we later can get all the definitions and declarations. */
178 #undef __need_getopt
179
180 #endif /* getopt.h */
option
Definition: gnugetopt.h:94