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