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1/* Declarations for getopt.
2 Copyright (C) 1989-1994,1996-1999,2001,2003,2004,2005,2006,2007
3 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program 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
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18
19#ifndef _GETOPT_H
20
21#ifndef __need_getopt
22# define _GETOPT_H 1
23#endif
24
25/* Standalone applications should #define __GETOPT_PREFIX to an
26 identifier that prefixes the external functions and variables
27 defined in this header. When this happens, include the
28 headers that might declare getopt so that they will not cause
29 confusion if included after this file. Then systematically rename
30 identifiers so that they do not collide with the system functions
31 and variables. Renaming avoids problems with some compilers and
32 linkers. */
33#if defined __GETOPT_PREFIX && !defined __need_getopt
34# include <stdlib.h>
35# include <stdio.h>
36# include <unistd.h>
37# undef __need_getopt
38# undef getopt
39# undef getopt_long
40# undef getopt_long_only
41# undef optarg
42# undef opterr
43# undef optind
44# undef optopt
45# define __GETOPT_CONCAT(x, y) x ## y
46# define __GETOPT_XCONCAT(x, y) __GETOPT_CONCAT (x, y)
47# define __GETOPT_ID(y) __GETOPT_XCONCAT (__GETOPT_PREFIX, y)
48# define getopt __GETOPT_ID (getopt)
49# define getopt_long __GETOPT_ID (getopt_long)
50# define getopt_long_only __GETOPT_ID (getopt_long_only)
51# define optarg __GETOPT_ID (optarg)
52# define opterr __GETOPT_ID (opterr)
53# define optind __GETOPT_ID (optind)
54# define optopt __GETOPT_ID (optopt)
55#endif
56
57/* Standalone applications get correct prototypes for getopt_long and
58 getopt_long_only; they declare "char **argv". libc uses prototypes
59 with "char *const *argv" that are incorrect because getopt_long and
60 getopt_long_only can permute argv; this is required for backward
61 compatibility (e.g., for LSB 2.0.1).
62
63 This used to be `#if defined __GETOPT_PREFIX && !defined __need_getopt',
64 but it caused redefinition warnings if both unistd.h and getopt.h were
65 included, since unistd.h includes getopt.h having previously defined
66 __need_getopt.
67
68 The only place where __getopt_argv_const is used is in definitions
69 of getopt_long and getopt_long_only below, but these are visible
70 only if __need_getopt is not defined, so it is quite safe to rewrite
71 the conditional as follows:
72*/
73#if !defined __need_getopt
74# if defined __GETOPT_PREFIX
75# define __getopt_argv_const /* empty */
76# else
77# define __getopt_argv_const const
78# endif
79#endif
80
81/* If __GNU_LIBRARY__ is not already defined, either we are being used
82 standalone, or this is the first header included in the source file.
83 If we are being used with glibc, we need to include <features.h>, but
84 that does not exist if we are standalone. So: if __GNU_LIBRARY__ is
85 not defined, include <ctype.h>, which will pull in <features.h> for us
86 if it's from glibc. (Why ctype.h? It's guaranteed to exist and it
87 doesn't flood the namespace with stuff the way some other headers do.) */
88#if !defined __GNU_LIBRARY__
89# include <ctype.h>
90#endif
91
92#ifndef __THROW
93# ifndef __GNUC_PREREQ
94# define __GNUC_PREREQ(maj, min) (0)
95# endif
96# if defined __cplusplus && __GNUC_PREREQ (2,8)
97# define __THROW throw ()
98# else
99# define __THROW
100# endif
101#endif
102
103#ifdef __cplusplus
104extern "C" {
105#endif
106
107/* For communication from `getopt' to the caller.
108 When `getopt' finds an option that takes an argument,
109 the argument value is returned here.
110 Also, when `ordering' is RETURN_IN_ORDER,
111 each non-option ARGV-element is returned here. */
112
113extern char *optarg;
114
115/* Index in ARGV of the next element to be scanned.
116 This is used for communication to and from the caller
117 and for communication between successive calls to `getopt'.
118
119 On entry to `getopt', zero means this is the first call; initialize.
120
121 When `getopt' returns -1, this is the index of the first of the
122 non-option elements that the caller should itself scan.
123
124 Otherwise, `optind' communicates from one call to the next
125 how much of ARGV has been scanned so far. */
126
127extern int optind;
128
129/* Callers store zero here to inhibit the error message `getopt' prints
130 for unrecognized options. */
131
132extern int opterr;
133
134/* Set to an option character which was unrecognized. */
135
136extern int optopt;
137
138#ifndef __need_getopt
139/* Describe the long-named options requested by the application.
140 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
141 of `struct option' terminated by an element containing a name which is
142 zero.
143
144 The field `has_arg' is:
145 no_argument (or 0) if the option does not take an argument,
146 required_argument (or 1) if the option requires an argument,
147 optional_argument (or 2) if the option takes an optional argument.
148
149 If the field `flag' is not NULL, it points to a variable that is set
150 to the value given in the field `val' when the option is found, but
151 left unchanged if the option is not found.
152
153 To have a long-named option do something other than set an `int' to
154 a compiled-in constant, such as set a value from `optarg', set the
155 option's `flag' field to zero and its `val' field to a nonzero
156 value (the equivalent single-letter option character, if there is
157 one). For long options that have a zero `flag' field, `getopt'
158 returns the contents of the `val' field. */
159
160struct option
161{
162 const char *name;
163 /* has_arg can't be an enum because some compilers complain about
164 type mismatches in all the code that assumes it is an int. */
165 int has_arg;
166 int *flag;
167 int val;
168};
169
170/* Names for the values of the `has_arg' field of `struct option'. */
171
172# define no_argument 0
173# define required_argument 1
174# define optional_argument 2
175#endif /* need getopt */
176
177
178/* Get definitions and prototypes for functions to process the
179 arguments in ARGV (ARGC of them, minus the program name) for
180 options given in OPTS.
181
182 Return the option character from OPTS just read. Return -1 when
183 there are no more options. For unrecognized options, or options
184 missing arguments, `optopt' is set to the option letter, and '?' is
185 returned.
186
187 The OPTS string is a list of characters which are recognized option
188 letters, optionally followed by colons, specifying that that letter
189 takes an argument, to be placed in `optarg'.
190
191 If a letter in OPTS is followed by two colons, its argument is
192 optional. This behavior is specific to the GNU `getopt'.
193
194 The argument `--' causes premature termination of argument
195 scanning, explicitly telling `getopt' that there are no more
196 options.
197
198 If OPTS begins with `-', then non-option arguments are treated as
199 arguments to the option '\1'. This behavior is specific to the GNU
200 `getopt'. If OPTS begins with `+', or POSIXLY_CORRECT is set in
201 the environment, then do not permute arguments. */
202
203extern int getopt (int ___argc, char *const *___argv, const char *__shortopts)
204 __THROW;
205
206#ifndef __need_getopt
207extern int getopt_long (int ___argc, char *__getopt_argv_const *___argv,
208 const char *__shortopts,
209 const struct option *__longopts, int *__longind)
210 __THROW;
211extern int getopt_long_only (int ___argc, char *__getopt_argv_const *___argv,
212 const char *__shortopts,
213 const struct option *__longopts, int *__longind)
214 __THROW;
215
216#endif
217
218#ifdef __cplusplus
219}
220#endif
221
222/* Make sure we later can get all the definitions and declarations. */
223#undef __need_getopt
224
225#endif /* getopt.h */