1 /* Declarations for getopt.
2 Copyright (C) 1989,90,91,92,93,94,96,97 Free Software Foundation, Inc.
4 NOTE: The canonical source of this file is maintained with the GNU C Library.
5 Bugs can be reported to bug-glibc@gnu.org.
7 This program is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 2, or (at your option) any
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
26 * The operating system may or may not provide getopt_long(), and if
27 * so it may or may not be a version we are willing to use. Our
28 * strategy is to declare getopt here, and then provide code unless
29 * the supplied version is adequate. The difficult case is when a
30 * declaration for getopt is provided, as our declaration must match.
32 * XXX Arguably this version should be named differently, and the
33 * local names defined to refer to the system version when we choose
34 * to use the system version.
41 /* For communication from `getopt' to the caller.
42 When `getopt' finds an option that takes an argument,
43 the argument value is returned here.
44 Also, when `ordering' is RETURN_IN_ORDER,
45 each non-option ARGV-element is returned here. */
49 /* Index in ARGV of the next element to be scanned.
50 This is used for communication to and from the caller
51 and for communication between successive calls to `getopt'.
53 On entry to `getopt', zero means this is the first call; initialize.
55 When `getopt' returns -1, this is the index of the first of the
56 non-option elements that the caller should itself scan.
58 Otherwise, `optind' communicates from one call to the next
59 how much of ARGV has been scanned so far. */
63 /* Callers store zero here to inhibit the error message `getopt' prints
64 for unrecognized options. */
68 /* Set to an option character which was unrecognized. */
72 /* Describe the long-named options requested by the application.
73 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
74 of `struct option' terminated by an element containing a name which is
77 The field `has_arg' is:
78 no_argument (or 0) if the option does not take an argument,
79 required_argument (or 1) if the option requires an argument,
80 optional_argument (or 2) if the option takes an optional argument.
82 If the field `flag' is not NULL, it points to a variable that is set
83 to the value given in the field `val' when the option is found, but
84 left unchanged if the option is not found.
86 To have a long-named option do something other than set an `int' to
87 a compiled-in constant, such as set a value from `optarg', set the
88 option's `flag' field to zero and its `val' field to a nonzero
89 value (the equivalent single-letter option character, if there is
90 one). For long options that have a zero `flag' field, `getopt'
91 returns the contents of the `val' field. */
95 #if defined (__STDC__) && __STDC__
100 /* has_arg can't be an enum because some compilers complain about
101 type mismatches in all the code that assumes it is an int. */
107 /* Names for the values of the `has_arg' field of `struct option'. */
109 #define no_argument 0
110 #define required_argument 1
111 #define optional_argument 2
113 #if defined (__STDC__) && __STDC__
115 #if REALLY_NEED_PLAIN_GETOPT
118 * getopt is defined in POSIX.2. Assume that if the system defines
119 * getopt that it complies with POSIX.2. If not, an autoconf test
120 * should be written to define NONPOSIX_GETOPT_DEFINITION.
122 #ifndef NONPOSIX_GETOPT_DEFINITION
123 extern int getopt (int argc, char *const *argv, const char *shortopts);
124 #else /* NONPOSIX_GETOPT_DEFINITION */
125 extern int getopt (void);
126 #endif /* NONPOSIX_GETOPT_DEFINITION */
131 extern int getopt_long (int argc, char *const *argv, const char *shortopts,
132 const struct option *longopts, int *longind);
133 extern int getopt_long_only (int argc, char *const *argv,
134 const char *shortopts,
135 const struct option *longopts, int *longind);
137 /* Internal only. Users should not call this directly. */
138 extern int _getopt_internal (int argc, char *const *argv,
139 const char *shortopts,
140 const struct option *longopts, int *longind,
142 #else /* not __STDC__ */
144 #ifdef REALLY_NEED_PLAIN_GETOPT
145 extern int getopt ();
146 #endif /* REALLY_NEED_PLAIN_GETOPT */
148 extern int getopt_long ();
149 extern int getopt_long_only ();
151 extern int _getopt_internal ();
153 #endif /* __STDC__ */
159 #endif /* getopt.h */