1 /* Declarations for getopt.
2 Copyright (C) 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify it
5 it under the terms of the GNU General Public License Version 2 as
6 published by the Free Software Foundation. You may not use, modify or
7 distribute this program under any other version of the GNU General
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details. */
18 #ifndef HAVE_GETOPT_LONG
24 /* For communication from `getopt' to the caller.
25 When `getopt' finds an option that takes an argument,
26 the argument value is returned here.
27 Also, when `ordering' is RETURN_IN_ORDER,
28 each non-option ARGV-element is returned here. */
32 /* Index in ARGV of the next element to be scanned.
33 This is used for communication to and from the caller
34 and for communication between successive calls to `getopt'.
36 On entry to `getopt', zero means this is the first call; initialize.
38 When `getopt' returns EOF, this is the index of the first of the
39 non-option elements that the caller should itself scan.
41 Otherwise, `optind' communicates from one call to the next
42 how much of ARGV has been scanned so far. */
46 /* Callers store zero here to inhibit the error message `getopt' prints
47 for unrecognized options. */
51 /* Set to an option character which was unrecognized. */
55 /* Describe the long-named options requested by the application.
56 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
57 of `struct option' terminated by an element containing a name which is
60 The field `has_arg' is:
61 no_argument (or 0) if the option does not take an argument,
62 required_argument (or 1) if the option requires an argument,
63 optional_argument (or 2) if the option takes an optional argument.
65 If the field `flag' is not NULL, it points to a variable that is set
66 to the value given in the field `val' when the option is found, but
67 left unchanged if the option is not found.
69 To have a long-named option do something other than set an `int' to
70 a compiled-in constant, such as set a value from `optarg', set the
71 option's `flag' field to zero and its `val' field to a nonzero
72 value (the equivalent single-letter option character, if there is
73 one). For long options that have a zero `flag' field, `getopt'
74 returns the contents of the `val' field. */
83 /* has_arg can't be an enum because some compilers complain about
84 type mismatches in all the code that assumes it is an int. */
90 /* Names for the values of the `has_arg' field of `struct option'. */
93 #define required_argument 1
94 #define optional_argument 2
99 extern int getopt (int argc, char *const *argv, const char *optstring);
102 extern int getopt_long (int argc, char *const *argv, const char *shortopts,
103 const struct option *longopts, int *longind);
104 extern int getopt_long_only (int argc, char *const *argv,
105 const char *shortopts,
106 const struct option *longopts, int *longind);
108 /* Internal only. Users should not call this directly. */
109 extern int _getopt_internal (int argc, char *const *argv,
110 const char *shortopts,
111 const struct option *longopts, int *longind,
113 #else /* not __STDC__ */
116 extern int getopt ();
118 extern int getopt_long ();
119 extern int getopt_long_only ();
121 extern int _getopt_internal ();
122 #endif /* not __STDC__ */
128 #endif /* HAVE_GETOPT_LONG */
130 #endif /* _GETOPT_H */