1 /* Declarations for getopt.
2 Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU Library General Public License as published
6 by the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
25 /* For communication from `getopt' to the caller.
26 When `getopt' finds an option that takes an argument,
27 the argument value is returned here.
28 Also, when `ordering' is RETURN_IN_ORDER,
29 each non-option ARGV-element is returned here. */
33 /* Index in ARGV of the next element to be scanned.
34 This is used for communication to and from the caller
35 and for communication between successive calls to `getopt'.
37 On entry to `getopt', zero means this is the first call; initialize.
39 When `getopt' returns EOF, this is the index of the first of the
40 non-option elements that the caller should itself scan.
42 Otherwise, `optind' communicates from one call to the next
43 how much of ARGV has been scanned so far. */
47 /* Callers store zero here to inhibit the error message `getopt' prints
48 for unrecognized options. */
52 /* Describe the long-named options requested by the application.
53 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
54 of `struct option' terminated by an element containing a name which is
57 The field `has_arg' is:
58 no_argument (or 0) if the option does not take an argument,
59 required_argument (or 1) if the option requires an argument,
60 optional_argument (or 2) if the option takes an optional argument.
62 If the field `flag' is not NULL, it points to a variable that is set
63 to the value given in the field `val' when the option is found, but
64 left unchanged if the option is not found.
66 To have a long-named option do something other than set an `int' to
67 a compiled-in constant, such as set a value from `optarg', set the
68 option's `flag' field to zero and its `val' field to a nonzero
69 value (the equivalent single-letter option character, if there is
70 one). For long options that have a zero `flag' field, `getopt'
71 returns the contents of the `val' field. */
80 /* has_arg can't be an enum because some compilers complain about
81 type mismatches in all the code that assumes it is an int. */
87 /* Names for the values of the `has_arg' field of `struct option'.
88 We wouldn't mind doing this:
95 ...if we could also change the "int has_arg" above. For now, use
99 #define required_argument 1
100 #define optional_argument 2
103 extern int getopt (int argc
, char *const *argv
, const char *shortopts
);
104 extern int getopt_long (int argc
, char *const *argv
, const char *shortopts
,
105 const struct option
*longopts
, int *longind
);
106 extern int getopt_long_only (int argc
, char *const *argv
,
107 const char *shortopts
,
108 const struct option
*longopts
, int *longind
);
110 /* Internal only. Users should not call this directly. */
111 extern int _getopt_internal (int argc
, char *const *argv
,
112 const char *shortopts
,
113 const struct option
*longopts
, int *longind
,
115 #else /* not __STDC__ */
116 extern int getopt ();
117 extern int getopt_long ();
118 extern int getopt_long_only ();
120 extern int _getopt_internal ();
121 #endif /* not __STDC__ */
127 #endif /* _GETOPT_H */
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