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
47 # define getopt __GETOPT_PREFIX##getopt
48 # define getopt_long __GETOPT_PREFIX##getopt_long
49 # define getopt_long_only __GETOPT_PREFIX##getopt_long_only
50 # define optarg __GETOPT_PREFIX##optarg
51 # define opterr __GETOPT_PREFIX##opterr
52 # define optind __GETOPT_PREFIX##optind
53 # define optopt __GETOPT_PREFIX##optopt
56 /* The elements of the ARGV arguments to getopt aren't really const,
57 because we permute them. For glibc, __getopt_argv_const is const
58 so that prototypes pretend the elements are const, to be compatible
59 with Posix. However, drop this pretense for standalone
60 applications, since it's not needed there and it's safer not to lie
62 #ifdef __GETOPT_PREFIX
63 # define __getopt_argv_const /* empty */
65 # define __getopt_argv_const const
68 /* If __GNU_LIBRARY__ is not already defined, either we are being used
69 standalone, or this is the first header included in the source file.
70 If we are being used with glibc, we need to include <features.h>, but
71 that does not exist if we are standalone. So: if __GNU_LIBRARY__ is
72 not defined, include <ctype.h>, which will pull in <features.h> for us
73 if it's from glibc. (Why ctype.h? It's guaranteed to exist and it
74 doesn't flood the namespace with stuff the way some other headers do.) */
75 #if !defined __GNU_LIBRARY__
80 # ifndef __GNUC_PREREQ
81 # define __GNUC_PREREQ(maj, min) (0)
83 # if defined __cplusplus && __GNUC_PREREQ (2,8)
84 # define __THROW throw ()
94 /* For communication from `getopt' to the caller.
95 When `getopt' finds an option that takes an argument,
96 the argument value is returned here.
97 Also, when `ordering' is RETURN_IN_ORDER,
98 each non-option ARGV-element is returned here. */
102 /* Index in ARGV of the next element to be scanned.
103 This is used for communication to and from the caller
104 and for communication between successive calls to `getopt'.
106 On entry to `getopt', zero means this is the first call; initialize.
108 When `getopt' returns -1, this is the index of the first of the
109 non-option elements that the caller should itself scan.
111 Otherwise, `optind' communicates from one call to the next
112 how much of ARGV has been scanned so far. */
116 /* Callers store zero here to inhibit the error message `getopt' prints
117 for unrecognized options. */
121 /* Set to an option character which was unrecognized. */
125 #ifndef __need_getopt
126 /* Describe the long-named options requested by the application.
127 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
128 of `struct option' terminated by an element containing a name which is
131 The field `has_arg' is:
132 no_argument (or 0) if the option does not take an argument,
133 required_argument (or 1) if the option requires an argument,
134 optional_argument (or 2) if the option takes an optional argument.
136 If the field `flag' is not NULL, it points to a variable that is set
137 to the value given in the field `val' when the option is found, but
138 left unchanged if the option is not found.
140 To have a long-named option do something other than set an `int' to
141 a compiled-in constant, such as set a value from `optarg', set the
142 option's `flag' field to zero and its `val' field to a nonzero
143 value (the equivalent single-letter option character, if there is
144 one). For long options that have a zero `flag' field, `getopt'
145 returns the contents of the `val' field. */
150 /* has_arg can't be an enum because some compilers complain about
151 type mismatches in all the code that assumes it is an int. */
157 /* Names for the values of the `has_arg' field of `struct option'. */
159 # define no_argument 0
160 # define required_argument 1
161 # define optional_argument 2
162 #endif /* need getopt */
165 /* Get definitions and prototypes for functions to process the
166 arguments in ARGV (ARGC of them, minus the program name) for
167 options given in OPTS.
169 Return the option character from OPTS just read. Return -1 when
170 there are no more options. For unrecognized options, or options
171 missing arguments, `optopt' is set to the option letter, and '?' is
174 The OPTS string is a list of characters which are recognized option
175 letters, optionally followed by colons, specifying that that letter
176 takes an argument, to be placed in `optarg'.
178 If a letter in OPTS is followed by two colons, its argument is
179 optional. This behavior is specific to the GNU `getopt'.
181 The argument `--' causes premature termination of argument
182 scanning, explicitly telling `getopt' that there are no more
185 If OPTS begins with `--', then non-option arguments are treated as
186 arguments to the option '\0'. This behavior is specific to the GNU
189 extern int getopt (int ___argc, char *__getopt_argv_const *___argv,
190 const char *__shortopts)
193 #ifndef __need_getopt
194 extern int getopt_long (int ___argc, char *__getopt_argv_const *___argv,
195 const char *__shortopts,
196 const struct option *__longopts, int *__longind)
198 extern int getopt_long_only (int ___argc, char *__getopt_argv_const *___argv,
199 const char *__shortopts,
200 const struct option *__longopts, int *__longind)
209 /* Make sure we later can get all the definitions and declarations. */
212 #endif /* getopt.h */