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 General Public License as published by the
6 Free Software Foundation; either version 2, or (at your option) any
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 General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
18 This file was modified slightly by Ian Lance Taylor, November 1992,
28 /* Ian Lance Taylor <ian@airs.com> added the following defines for
29 Taylor UUCP. This avoids reported conflicts with system getopt
31 #define getopt gnu_getopt
32 #define optarg gnu_optarg
33 #define optind gnu_optind
34 #define opterr gnu_opterr
36 /* For communication from `getopt' to the caller.
37 When `getopt' finds an option that takes an argument,
38 the argument value is returned here.
39 Also, when `ordering' is RETURN_IN_ORDER,
40 each non-option ARGV-element is returned here. */
44 /* Index in ARGV of the next element to be scanned.
45 This is used for communication to and from the caller
46 and for communication between successive calls to `getopt'.
48 On entry to `getopt', zero means this is the first call; initialize.
50 When `getopt' returns EOF, this is the index of the first of the
51 non-option elements that the caller should itself scan.
53 Otherwise, `optind' communicates from one call to the next
54 how much of ARGV has been scanned so far. */
58 /* Callers store zero here to inhibit the error message `getopt' prints
59 for unrecognized options. */
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. */
87 /* has_arg can't be an enum because some compilers complain about
88 type mismatches in all the code that assumes it is an int. */
94 /* Names for the values of the `has_arg' field of `struct option'. */
103 extern int getopt P((int argc, char *const *argv, const char *shortopts));
104 extern int getopt_long P((int argc, char *const *argv, const char *shortopts,
105 const struct option *longopts, int *longind));
106 extern int getopt_long_only P((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 P((int argc, char *const *argv,
112 const char *shortopts,
113 const struct option *longopts, int *longind,
120 #endif /* _GETOPT_H */