1 /* Declarations for getopt.
2 Copyright (C) 1989-1994,1996-1999,2001,2003,2004
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 2, or (at your option)
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 along
17 with this program; if not, write to the Free Software Foundation,
18 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
26 /* Standalone applications should #define __GETOPT_PREFIX to an
27 identifier that prefixes the external functions and variables
28 defined in this header. When this happens, include the
29 headers that might declare getopt so that they will not cause
30 confusion if included after this file. Then systematically rename
31 identifiers so that they do not collide with the system functions
32 and variables. Renaming avoids problems with some compilers and
34 #if defined __GETOPT_PREFIX && !defined __need_getopt
42 # undef getopt_long_only
48 # define __CONCAT(x, y) x ## y
50 # define getopt __CONCAT (__GETOPT_PREFIX, getopt)
51 # define getopt_long __CONCAT (__GETOPT_PREFIX, getopt_long)
52 # define getopt_long_only __CONCAT (__GETOPT_PREFIX, getopt_long_only)
53 # define optarg __CONCAT (__GETOPT_PREFIX, optarg)
54 # define opterr __CONCAT (__GETOPT_PREFIX, opterr)
55 # define optind __CONCAT (__GETOPT_PREFIX, optind)
56 # define optopt __CONCAT (__GETOPT_PREFIX, optopt)
59 /* Standalone applications get correct prototypes for getopt_long and
60 getopt_long_only; they declare "char **argv". libc uses prototypes
61 with "char *const *argv" that are incorrect because getopt_long and
62 getopt_long_only can permute argv; this is required for backward
63 compatibility (e.g., for LSB 2.0.1). */
64 #if defined __GETOPT_PREFIX && !defined __need_getopt
65 # define __getopt_argv_const /* empty */
67 # define __getopt_argv_const const
70 /* If __GNU_LIBRARY__ is not already defined, either we are being used
71 standalone, or this is the first header included in the source file.
72 If we are being used with glibc, we need to include <features.h>, but
73 that does not exist if we are standalone. So: if __GNU_LIBRARY__ is
74 not defined, include <ctype.h>, which will pull in <features.h> for us
75 if it's from glibc. (Why ctype.h? It's guaranteed to exist and it
76 doesn't flood the namespace with stuff the way some other headers do.) */
77 #if !defined __GNU_LIBRARY__
82 # ifndef __GNUC_PREREQ
83 # define __GNUC_PREREQ(maj, min) (0)
85 # if defined __cplusplus && __GNUC_PREREQ (2,8)
86 # define __THROW throw ()
96 /* For communication from `getopt' to the caller.
97 When `getopt' finds an option that takes an argument,
98 the argument value is returned here.
99 Also, when `ordering' is RETURN_IN_ORDER,
100 each non-option ARGV-element is returned here. */
104 /* Index in ARGV of the next element to be scanned.
105 This is used for communication to and from the caller
106 and for communication between successive calls to `getopt'.
108 On entry to `getopt', zero means this is the first call; initialize.
110 When `getopt' returns -1, this is the index of the first of the
111 non-option elements that the caller should itself scan.
113 Otherwise, `optind' communicates from one call to the next
114 how much of ARGV has been scanned so far. */
118 /* Callers store zero here to inhibit the error message `getopt' prints
119 for unrecognized options. */
123 /* Set to an option character which was unrecognized. */
127 #ifndef __need_getopt
128 /* Describe the long-named options requested by the application.
129 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
130 of `struct option' terminated by an element containing a name which is
133 The field `has_arg' is:
134 no_argument (or 0) if the option does not take an argument,
135 required_argument (or 1) if the option requires an argument,
136 optional_argument (or 2) if the option takes an optional argument.
138 If the field `flag' is not NULL, it points to a variable that is set
139 to the value given in the field `val' when the option is found, but
140 left unchanged if the option is not found.
142 To have a long-named option do something other than set an `int' to
143 a compiled-in constant, such as set a value from `optarg', set the
144 option's `flag' field to zero and its `val' field to a nonzero
145 value (the equivalent single-letter option character, if there is
146 one). For long options that have a zero `flag' field, `getopt'
147 returns the contents of the `val' field. */
152 /* has_arg can't be an enum because some compilers complain about
153 type mismatches in all the code that assumes it is an int. */
159 /* Names for the values of the `has_arg' field of `struct option'. */
161 # define no_argument 0
162 # define required_argument 1
163 # define optional_argument 2
164 #endif /* need getopt */
167 /* Get definitions and prototypes for functions to process the
168 arguments in ARGV (ARGC of them, minus the program name) for
169 options given in OPTS.
171 Return the option character from OPTS just read. Return -1 when
172 there are no more options. For unrecognized options, or options
173 missing arguments, `optopt' is set to the option letter, and '?' is
176 The OPTS string is a list of characters which are recognized option
177 letters, optionally followed by colons, specifying that that letter
178 takes an argument, to be placed in `optarg'.
180 If a letter in OPTS is followed by two colons, its argument is
181 optional. This behavior is specific to the GNU `getopt'.
183 The argument `--' causes premature termination of argument
184 scanning, explicitly telling `getopt' that there are no more
187 If OPTS begins with `--', then non-option arguments are treated as
188 arguments to the option '\0'. This behavior is specific to the GNU
191 extern int getopt (int ___argc, char *const *___argv, const char *__shortopts)
194 #ifndef __need_getopt
195 extern int getopt_long (int ___argc, char *__getopt_argv_const *___argv,
196 const char *__shortopts,
197 const struct option *__longopts, int *__longind)
199 extern int getopt_long_only (int ___argc, char *__getopt_argv_const *___argv,
200 const char *__shortopts,
201 const struct option *__longopts, int *__longind)
210 /* Make sure we later can get all the definitions and declarations. */
213 #endif /* getopt.h */