4 /* Declarations for getopt.
5 Copyright (C) 1989,90,91,92,93,94,96,97 Free Software Foundation, Inc.
7 NOTE: The canonical source of this file is maintained with the GNU C Library.
8 Bugs can be reported to bug-glibc@prep.ai.mit.edu.
10 This program is free software; you can redistribute it and/or modify it
11 under the terms of the GNU General Public License as published by the
12 Free Software Foundation; either version 2, or (at your option) any
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License along
21 with this program; if not, write to the Free Software Foundation, Inc.,
22 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
32 /* For communication from `getopt' to the caller.
33 When `getopt' finds an option that takes an argument,
34 the argument value is returned here.
35 Also, when `ordering' is RETURN_IN_ORDER,
36 each non-option ARGV-element is returned here. */
40 /* Index in ARGV of the next element to be scanned.
41 This is used for communication to and from the caller
42 and for communication between successive calls to `getopt'.
44 On entry to `getopt', zero means this is the first call; initialize.
46 When `getopt' returns -1, this is the index of the first of the
47 non-option elements that the caller should itself scan.
49 Otherwise, `optind' communicates from one call to the next
50 how much of ARGV has been scanned so far. */
54 /* Callers store zero here to inhibit the error message `getopt' prints
55 for unrecognized options. */
59 /* Set to an option character which was unrecognized. */
63 /* Describe the long-named options requested by the application.
64 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
65 of `struct option' terminated by an element containing a name which is
68 The field `has_arg' is:
69 no_argument (or 0) if the option does not take an argument,
70 required_argument (or 1) if the option requires an argument,
71 optional_argument (or 2) if the option takes an optional argument.
73 If the field `flag' is not NULL, it points to a variable that is set
74 to the value given in the field `val' when the option is found, but
75 left unchanged if the option is not found.
77 To have a long-named option do something other than set an `int' to
78 a compiled-in constant, such as set a value from `optarg', set the
79 option's `flag' field to zero and its `val' field to a nonzero
80 value (the equivalent single-letter option character, if there is
81 one). For long options that have a zero `flag' field, `getopt'
82 returns the contents of the `val' field. */
85 #if defined (__STDC__) && __STDC__
90 /* has_arg can't be an enum because some compilers complain about
91 type mismatches in all the code that assumes it is an int. */
97 /* Names for the values of the `has_arg' field of `struct option'. */
100 #define required_argument 1
101 #define optional_argument 2
103 #if defined (__STDC__) && __STDC__
104 #ifdef __GNU_LIBRARY__
105 /* Many other libraries have conflicting prototypes for getopt, with
106 differences in the consts, in stdlib.h. To avoid compilation
107 errors, only prototype getopt for the GNU C library. */
108 extern int getopt(int argc, char *const *argv, const char *shortopts);
109 #else /* not __GNU_LIBRARY__ */
111 #endif /* __GNU_LIBRARY__ */
112 extern int getopt_long(int argc, char *const *argv, const char *shortopts,
113 const struct option *longopts, int *longind);
114 extern int getopt_long_only(int argc, char *const *argv,
115 const char *shortopts,
116 const struct option *longopts, int *longind);
118 /* Internal only. Users should not call this directly. */
119 extern int _getopt_internal(int argc, char *const *argv,
120 const char *shortopts,
121 const struct option *longopts, int *longind,
123 #else /* not __STDC__ */
125 extern int getopt_long();
126 extern int getopt_long_only();
128 extern int _getopt_internal();
129 #endif /* __STDC__ */