1 /* Declarations for getopt.
2 Copyright (C) 1989-1994,1996-1999,2001,2003,2004,2005,2006,2007,2009
3 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
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.
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.
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/>. */
22 @PRAGMA_SYSTEM_HEADER@
25 /* The include_next requires a split double-inclusion guard. */
27 # @INCLUDE_NEXT@ @NEXT_GETOPT_H@
33 # define _GL_GETOPT_H 1
36 /* Standalone applications should #define __GETOPT_PREFIX to an
37 identifier that prefixes the external functions and variables
38 defined in this header. When this happens, include the
39 headers that might declare getopt so that they will not cause
40 confusion if included after this file (if the system had <getopt.h>,
41 we have already included it). Then systematically rename
42 identifiers so that they do not collide with the system functions
43 and variables. Renaming avoids problems with some compilers and
45 #if defined __GETOPT_PREFIX && !defined __need_getopt
54 # undef getopt_long_only
60 # define __GETOPT_CONCAT(x, y) x ## y
61 # define __GETOPT_XCONCAT(x, y) __GETOPT_CONCAT (x, y)
62 # define __GETOPT_ID(y) __GETOPT_XCONCAT (__GETOPT_PREFIX, y)
63 # define getopt __GETOPT_ID (getopt)
64 # define getopt_long __GETOPT_ID (getopt_long)
65 # define getopt_long_only __GETOPT_ID (getopt_long_only)
66 # define optarg __GETOPT_ID (optarg)
67 # define opterr __GETOPT_ID (opterr)
68 # define optind __GETOPT_ID (optind)
69 # define optopt __GETOPT_ID (optopt)
70 # define option __GETOPT_ID (option)
73 /* Standalone applications get correct prototypes for getopt_long and
74 getopt_long_only; they declare "char **argv". libc uses prototypes
75 with "char *const *argv" that are incorrect because getopt_long and
76 getopt_long_only can permute argv; this is required for backward
77 compatibility (e.g., for LSB 2.0.1).
79 This used to be `#if defined __GETOPT_PREFIX && !defined __need_getopt',
80 but it caused redefinition warnings if both unistd.h and getopt.h were
81 included, since unistd.h includes getopt.h having previously defined
84 The only place where __getopt_argv_const is used is in definitions
85 of getopt_long and getopt_long_only below, but these are visible
86 only if __need_getopt is not defined, so it is quite safe to rewrite
87 the conditional as follows:
89 #if !defined __need_getopt
90 # if defined __GETOPT_PREFIX
91 # define __getopt_argv_const /* empty */
93 # define __getopt_argv_const const
97 /* If __GNU_LIBRARY__ is not already defined, either we are being used
98 standalone, or this is the first header included in the source file.
99 If we are being used with glibc, we need to include <features.h>, but
100 that does not exist if we are standalone. So: if __GNU_LIBRARY__ is
101 not defined, include <ctype.h>, which will pull in <features.h> for us
102 if it's from glibc. (Why ctype.h? It's guaranteed to exist and it
103 doesn't flood the namespace with stuff the way some other headers do.) */
104 #if !defined __GNU_LIBRARY__
109 # ifndef __GNUC_PREREQ
110 # define __GNUC_PREREQ(maj, min) (0)
112 # if defined __cplusplus && __GNUC_PREREQ (2,8)
113 # define __THROW throw ()
123 /* For communication from `getopt' to the caller.
124 When `getopt' finds an option that takes an argument,
125 the argument value is returned here.
126 Also, when `ordering' is RETURN_IN_ORDER,
127 each non-option ARGV-element is returned here. */
131 /* Index in ARGV of the next element to be scanned.
132 This is used for communication to and from the caller
133 and for communication between successive calls to `getopt'.
135 On entry to `getopt', zero means this is the first call; initialize.
137 When `getopt' returns -1, this is the index of the first of the
138 non-option elements that the caller should itself scan.
140 Otherwise, `optind' communicates from one call to the next
141 how much of ARGV has been scanned so far. */
145 /* Callers store zero here to inhibit the error message `getopt' prints
146 for unrecognized options. */
150 /* Set to an option character which was unrecognized. */
154 #ifndef __need_getopt
155 /* Describe the long-named options requested by the application.
156 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
157 of `struct option' terminated by an element containing a name which is
160 The field `has_arg' is:
161 no_argument (or 0) if the option does not take an argument,
162 required_argument (or 1) if the option requires an argument,
163 optional_argument (or 2) if the option takes an optional argument.
165 If the field `flag' is not NULL, it points to a variable that is set
166 to the value given in the field `val' when the option is found, but
167 left unchanged if the option is not found.
169 To have a long-named option do something other than set an `int' to
170 a compiled-in constant, such as set a value from `optarg', set the
171 option's `flag' field to zero and its `val' field to a nonzero
172 value (the equivalent single-letter option character, if there is
173 one). For long options that have a zero `flag' field, `getopt'
174 returns the contents of the `val' field. */
179 /* has_arg can't be an enum because some compilers complain about
180 type mismatches in all the code that assumes it is an int. */
186 /* Names for the values of the `has_arg' field of `struct option'. */
188 # define no_argument 0
189 # define required_argument 1
190 # define optional_argument 2
191 #endif /* need getopt */
194 /* Get definitions and prototypes for functions to process the
195 arguments in ARGV (ARGC of them, minus the program name) for
196 options given in OPTS.
198 Return the option character from OPTS just read. Return -1 when
199 there are no more options. For unrecognized options, or options
200 missing arguments, `optopt' is set to the option letter, and '?' is
203 The OPTS string is a list of characters which are recognized option
204 letters, optionally followed by colons, specifying that that letter
205 takes an argument, to be placed in `optarg'.
207 If a letter in OPTS is followed by two colons, its argument is
208 optional. This behavior is specific to the GNU `getopt'.
210 The argument `--' causes premature termination of argument
211 scanning, explicitly telling `getopt' that there are no more
214 If OPTS begins with `-', then non-option arguments are treated as
215 arguments to the option '\1'. This behavior is specific to the GNU
216 `getopt'. If OPTS begins with `+', or POSIXLY_CORRECT is set in
217 the environment, then do not permute arguments. */
219 extern int getopt (int ___argc, char *const *___argv, const char *__shortopts)
222 #ifndef __need_getopt
223 extern int getopt_long (int ___argc, char *__getopt_argv_const *___argv,
224 const char *__shortopts,
225 const struct option *__longopts, int *__longind)
227 extern int getopt_long_only (int ___argc, char *__getopt_argv_const *___argv,
228 const char *__shortopts,
229 const struct option *__longopts, int *__longind)
238 /* Make sure we later can get all the definitions and declarations. */
241 #endif /* getopt.h */
242 #endif /* getopt.h */