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 Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1, or (at your option)
9 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 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License along
17 with this program; if not, write to the Free Software Foundation,
18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
19
20 #ifndef _GETOPT_H
21
22 #ifndef __need_getopt
23 # define _GETOPT_H 1
24 #endif
25
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
33 linkers. */
34 #if defined __GETOPT_PREFIX && !defined __need_getopt
35 # include <stdlib.h>
36 # include <stdio.h>
37 # include <unistd.h>
38 # undef __need_getopt
39 # undef getopt
40 # undef getopt_long
41 # undef getopt_long_only
42 # undef optarg
43 # undef opterr
44 # undef optind
45 # undef optopt
46 # define __GETOPT_CONCAT(x, y) x ## y
47 # define __GETOPT_XCONCAT(x, y) __GETOPT_CONCAT (x, y)
48 # define __GETOPT_ID(y) __GETOPT_XCONCAT (__GETOPT_PREFIX, y)
49 # define getopt __GETOPT_ID (getopt)
50 # define getopt_long __GETOPT_ID (getopt_long)
51 # define getopt_long_only __GETOPT_ID (getopt_long_only)
52 # define optarg __GETOPT_ID (optarg)
53 # define opterr __GETOPT_ID (opterr)
54 # define optind __GETOPT_ID (optind)
55 # define optopt __GETOPT_ID (optopt)
56 #endif
57
58 /* Standalone applications get correct prototypes for getopt_long and
59 getopt_long_only; they declare "char **argv". libc uses prototypes
60 with "char *const *argv" that are incorrect because getopt_long and
61 getopt_long_only can permute argv; this is required for backward
62 compatibility (e.g., for LSB 2.0.1).
63
64 This used to be `#if defined __GETOPT_PREFIX && !defined __need_getopt',
65 but it caused redefinition warnings if both unistd.h and getopt.h were
66 included, since unistd.h includes getopt.h having previously defined
67 __need_getopt.
68
69 The only place where __getopt_argv_const is used is in definitions
70 of getopt_long and getopt_long_only below, but these are visible
71 only if __need_getopt is not defined, so it is quite safe to rewrite
72 the conditional as follows:
73 */
74 #if !defined __need_getopt
75 # if defined __GETOPT_PREFIX
76 # define __getopt_argv_const /* empty */
77 # else
78 # define __getopt_argv_const const
79 # endif
80 #endif
81
82 /* If __GNU_LIBRARY__ is not already defined, either we are being used
83 standalone, or this is the first header included in the source file.
84 If we are being used with glibc, we need to include <features.h>, but
85 that does not exist if we are standalone. So: if __GNU_LIBRARY__ is
86 not defined, include <ctype.h>, which will pull in <features.h> for us
87 if it's from glibc. (Why ctype.h? It's guaranteed to exist and it
88 doesn't flood the namespace with stuff the way some other headers do.) */
89 #if !defined __GNU_LIBRARY__
90 # include <ctype.h>
91 #endif
92
93 #ifndef __THROW
94 # ifndef __GNUC_PREREQ
95 # define __GNUC_PREREQ(maj, min) (0)
96 # endif
97 # if defined __cplusplus && __GNUC_PREREQ (2,8)
98 # define __THROW throw ()
99 # else
100 # define __THROW
101 # endif
102 #endif
103
104 #ifdef __cplusplus
105 extern "C" {
106 #endif
107
108 /* For communication from `getopt' to the caller.
109 When `getopt' finds an option that takes an argument,
110 the argument value is returned here.
111 Also, when `ordering' is RETURN_IN_ORDER,
112 each non-option ARGV-element is returned here. */
113
114 extern char *optarg;
115
116 /* Index in ARGV of the next element to be scanned.
117 This is used for communication to and from the caller
118 and for communication between successive calls to `getopt'.
119
120 On entry to `getopt', zero means this is the first call; initialize.
121
122 When `getopt' returns -1, this is the index of the first of the
123 non-option elements that the caller should itself scan.
124
125 Otherwise, `optind' communicates from one call to the next
126 how much of ARGV has been scanned so far. */
127
128 extern int optind;
129
130 /* Callers store zero here to inhibit the error message `getopt' prints
131 for unrecognized options. */
132
133 extern int opterr;
134
135 /* Set to an option character which was unrecognized. */
136
137 extern int optopt;
138
139 #ifndef __need_getopt
140 /* Describe the long-named options requested by the application.
141 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
142 of `struct option' terminated by an element containing a name which is
143 zero.
144
145 The field `has_arg' is:
146 no_argument (or 0) if the option does not take an argument,
147 required_argument (or 1) if the option requires an argument,
148 optional_argument (or 2) if the option takes an optional argument.
149
150 If the field `flag' is not NULL, it points to a variable that is set
151 to the value given in the field `val' when the option is found, but
152 left unchanged if the option is not found.
153
154 To have a long-named option do something other than set an `int' to
155 a compiled-in constant, such as set a value from `optarg', set the
156 option's `flag' field to zero and its `val' field to a nonzero
157 value (the equivalent single-letter option character, if there is
158 one). For long options that have a zero `flag' field, `getopt'
159 returns the contents of the `val' field. */
160
161 struct option
162 {
163 const char *name;
164 /* has_arg can't be an enum because some compilers complain about
165 type mismatches in all the code that assumes it is an int. */
166 int has_arg;
167 int *flag;
168 int val;
169 };
170
171 /* Names for the values of the `has_arg' field of `struct option'. */
172
173 # define no_argument 0
174 # define required_argument 1
175 # define optional_argument 2
176 #endif /* need getopt */
177
178
179 /* Get definitions and prototypes for functions to process the
180 arguments in ARGV (ARGC of them, minus the program name) for
181 options given in OPTS.
182
183 Return the option character from OPTS just read. Return -1 when
184 there are no more options. For unrecognized options, or options
185 missing arguments, `optopt' is set to the option letter, and '?' is
186 returned.
187
188 The OPTS string is a list of characters which are recognized option
189 letters, optionally followed by colons, specifying that that letter
190 takes an argument, to be placed in `optarg'.
191
192 If a letter in OPTS is followed by two colons, its argument is
193 optional. This behavior is specific to the GNU `getopt'.
194
195 The argument `--' causes premature termination of argument
196 scanning, explicitly telling `getopt' that there are no more
197 options.
198
199 If OPTS begins with `-', then non-option arguments are treated as
200 arguments to the option '\1'. This behavior is specific to the GNU
201 `getopt'. If OPTS begins with `+', or POSIXLY_CORRECT is set in
202 the environment, then do not permute arguments. */
203
204 extern int getopt (int ___argc, char *const *___argv, const char *__shortopts)
205 __THROW;
206
207 #ifndef __need_getopt
208 extern int getopt_long (int ___argc, char *__getopt_argv_const *___argv,
209 const char *__shortopts,
210 const struct option *__longopts, int *__longind)
211 __THROW;
212 extern int getopt_long_only (int ___argc, char *__getopt_argv_const *___argv,
213 const char *__shortopts,
214 const struct option *__longopts, int *__longind)
215 __THROW;
216
217 #endif
218
219 #ifdef __cplusplus
220 }
221 #endif
222
223 /* Make sure we later can get all the definitions and declarations. */
224 #undef __need_getopt
225
226 #endif /* getopt.h */