1 /* from http://www.pwilson.net/getopt.html */
4 /* Declarations for getopt.
5 Copyright (C) 1989-1994, 1996-1999, 2001 Free Software
6 Foundation, Inc. This file is part of the GNU C Library.
8 The GNU C Library is free software; you can redistribute
9 it and/or modify it under the terms of the GNU Lesser
10 General Public License as published by the Free Software
11 Foundation; either version 2.1 of the License, or
12 (at your option) any later version.
14 The GNU C Library is distributed in the hope that it will
15 be useful, but WITHOUT ANY WARRANTY; without even the
16 implied warranty of MERCHANTABILITY or FITNESS FOR A
17 PARTICULAR PURPOSE. See the GNU Lesser General Public
18 License for more details.
20 You should have received a copy of the GNU Lesser General
21 Public License along with the GNU C Library; if not, write
22 to the Free Software Foundation, Inc., 59 Temple Place,
23 Suite 330, Boston, MA 02111-1307 USA. */
35 /* If __GNU_LIBRARY__ is not already defined, either we are being used
36 standalone, or this is the first header included in the source file.
37 If we are being used with glibc, we need to include <features.h>, but
38 that does not exist if we are standalone. So: if __GNU_LIBRARY__ is
39 not defined, include <ctype.h>, which will pull in <features.h> for us
40 if it's from glibc. (Why ctype.h? It's guaranteed to exist and it
41 doesn't flood the namespace with stuff the way some other headers do.) */
42 #if !defined __GNU_LIBRARY__
50 /* For communication from `getopt' to the caller.
51 When `getopt' finds an option that takes an argument,
52 the argument value is returned here.
53 Also, when `ordering' is RETURN_IN_ORDER,
54 each non-option ARGV-element is returned here. */
58 /* Index in ARGV of the next element to be scanned.
59 This is used for communication to and from the caller
60 and for communication between successive calls to `getopt'.
62 On entry to `getopt', zero means this is the first call; initialize.
64 When `getopt' returns -1, this is the index of the first of the
65 non-option elements that the caller should itself scan.
67 Otherwise, `optind' communicates from one call to the next
68 how much of ARGV has been scanned so far. */
72 /* Callers store zero here to inhibit the error message `getopt' prints
73 for unrecognized options. */
77 /* Set to an option character which was unrecognized. */
82 /* Describe the long-named options requested by the application.
83 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
84 of `struct option' terminated by an element containing a name which is
87 The field `has_arg' is:
88 no_argument (or 0) if the option does not take an argument,
89 required_argument (or 1) if the option requires an argument,
90 optional_argument (or 2) if the option takes an optional argument.
92 If the field `flag' is not NULL, it points to a variable that is set
93 to the value given in the field `val' when the option is found, but
94 left unchanged if the option is not found.
96 To have a long-named option do something other than set an `int' to
97 a compiled-in constant, such as set a value from `optarg', set the
98 option's `flag' field to zero and its `val' field to a nonzero
99 value (the equivalent single-letter option character, if there is
100 one). For long options that have a zero `flag' field, `getopt'
101 returns the contents of the `val' field. */
105 # if (defined __STDC__ && __STDC__) || defined __cplusplus
110 /* has_arg can't be an enum because some compilers complain about
111 type mismatches in all the code that assumes it is an int. */
117 /* Names for the values of the `has_arg' field of `struct option'. */
119 # define no_argument 0
120 # define required_argument 1
121 # define optional_argument 2
122 #endif /* need getopt */
125 /* Get definitions and prototypes for functions to process the
126 arguments in ARGV (ARGC of them, minus the program name) for
127 options given in OPTS.
129 Return the option character from OPTS just read. Return -1 when
130 there are no more options. For unrecognized options, or options
131 missing arguments, `optopt' is set to the option letter, and '?' is
134 The OPTS string is a list of characters which are recognized option
135 letters, optionally followed by colons, specifying that that letter
136 takes an argument, to be placed in `optarg'.
138 If a letter in OPTS is followed by two colons, its argument is
139 optional. This behavior is specific to the GNU `getopt'.
141 The argument `--' causes premature termination of argument
142 scanning, explicitly telling `getopt' that there are no more
145 If OPTS begins with `--', then non-option arguments are treated as
146 arguments to the option '\0'. This behavior is specific to the GNU
149 #if (defined __STDC__ && __STDC__) || defined __cplusplus
150 # ifdef __GNU_LIBRARY__
151 /* Many other libraries have conflicting prototypes for getopt, with
152 differences in the consts, in stdlib.h. To avoid compilation
153 errors, only prototype getopt for the GNU C library. */
154 extern int getopt (int ___argc, char *const *___argv, const char *__shortopts);
155 # else /* not __GNU_LIBRARY__ */
156 extern int getopt ();
157 # endif /* __GNU_LIBRARY__ */
159 # ifndef __need_getopt
160 extern int getopt_long (int ___argc, char *const *___argv,
161 const char *__shortopts,
162 const struct option *__longopts, int *__longind);
163 extern int getopt_long_only (int ___argc, char *const *___argv,
164 const char *__shortopts,
165 const struct option *__longopts, int *__longind);
167 /* Internal only. Users should not call this directly. */
168 extern int _getopt_internal (int ___argc, char *const *___argv,
169 const char *__shortopts,
170 const struct option *__longopts, int *__longind,
173 #else /* not __STDC__ */
174 extern int getopt ();
175 # ifndef __need_getopt
176 extern int getopt_long ();
177 extern int getopt_long_only ();
179 extern int _getopt_internal ();
181 #endif /* __STDC__ */
187 /* Make sure we later can get all the definitions and declarations. */
190 #endif /* getopt.h */