1 /* Declarations for getopt.
2 Copyright (C) 1989-1994,1996-1999,2001,2003,2004,2009,2010
3 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
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 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
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__
38 # ifndef __GNUC_PREREQ
39 # define __GNUC_PREREQ(maj, min) (0)
41 # if defined __cplusplus && __GNUC_PREREQ (2,8)
42 # define __THROW throw ()
52 /* For communication from `getopt' to the caller.
53 When `getopt' finds an option that takes an argument,
54 the argument value is returned here.
55 Also, when `ordering' is RETURN_IN_ORDER,
56 each non-option ARGV-element is returned here. */
60 /* Index in ARGV of the next element to be scanned.
61 This is used for communication to and from the caller
62 and for communication between successive calls to `getopt'.
64 On entry to `getopt', zero means this is the first call; initialize.
66 When `getopt' returns -1, this is the index of the first of the
67 non-option elements that the caller should itself scan.
69 Otherwise, `optind' communicates from one call to the next
70 how much of ARGV has been scanned so far. */
74 /* Callers store zero here to inhibit the error message `getopt' prints
75 for unrecognized options. */
79 /* Set to an option character which was unrecognized. */
84 /* Describe the long-named options requested by the application.
85 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
86 of `struct option' terminated by an element containing a name which is
89 The field `has_arg' is:
90 no_argument (or 0) if the option does not take an argument,
91 required_argument (or 1) if the option requires an argument,
92 optional_argument (or 2) if the option takes an optional argument.
94 If the field `flag' is not NULL, it points to a variable that is set
95 to the value given in the field `val' when the option is found, but
96 left unchanged if the option is not found.
98 To have a long-named option do something other than set an `int' to
99 a compiled-in constant, such as set a value from `optarg', set the
100 option's `flag' field to zero and its `val' field to a nonzero
101 value (the equivalent single-letter option character, if there is
102 one). For long options that have a zero `flag' field, `getopt'
103 returns the contents of the `val' field. */
108 /* has_arg can't be an enum because some compilers complain about
109 type mismatches in all the code that assumes it is an int. */
115 /* Names for the values of the `has_arg' field of `struct option'. */
117 # define no_argument 0
118 # define required_argument 1
119 # define optional_argument 2
120 #endif /* need getopt */
123 /* Get definitions and prototypes for functions to process the
124 arguments in ARGV (ARGC of them, minus the program name) for
125 options given in OPTS.
127 Return the option character from OPTS just read. Return -1 when
128 there are no more options. For unrecognized options, or options
129 missing arguments, `optopt' is set to the option letter, and '?' is
132 The OPTS string is a list of characters which are recognized option
133 letters, optionally followed by colons, specifying that that letter
134 takes an argument, to be placed in `optarg'.
136 If a letter in OPTS is followed by two colons, its argument is
137 optional. This behavior is specific to the GNU `getopt'.
139 The argument `--' causes premature termination of argument
140 scanning, explicitly telling `getopt' that there are no more
143 If OPTS begins with `--', then non-option arguments are treated as
144 arguments to the option '\0'. This behavior is specific to the GNU
147 #ifdef __GNU_LIBRARY__
148 /* Many other libraries have conflicting prototypes for getopt, with
149 differences in the consts, in stdlib.h. To avoid compilation
150 errors, only prototype getopt for the GNU C library. */
151 extern int getopt (int ___argc
, char *const *___argv
, const char *__shortopts
)
154 # if defined __need_getopt && defined __USE_POSIX2 \
155 && !defined __USE_POSIX_IMPLICITLY && !defined __USE_GNU
156 /* The GNU getopt has more functionality than the standard version. The
157 additional functionality can be disable at runtime. This redirection
158 helps to also do this at runtime. */
160 extern int __REDIRECT_NTH (getopt
, (int ___argc
, char *const *___argv
,
161 const char *__shortopts
),
164 extern int __posix_getopt (int ___argc
, char *const *___argv
,
165 const char *__shortopts
) __THROW
;
166 # define getopt __posix_getopt
169 #else /* not __GNU_LIBRARY__ */
170 extern int getopt ();
171 #endif /* __GNU_LIBRARY__ */
173 #ifndef __need_getopt
174 extern int getopt_long (int ___argc
, char *const *___argv
,
175 const char *__shortopts
,
176 const struct option
*__longopts
, int *__longind
)
178 extern int getopt_long_only (int ___argc
, char *const *___argv
,
179 const char *__shortopts
,
180 const struct option
*__longopts
, int *__longind
)
189 /* Make sure we later can get all the definitions and declarations. */
192 #endif /* getopt.h */