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
5 it under the terms of the GNU General Public License as published by
6 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 General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* For communication from `getopt' to the caller.
22 When `getopt' finds an option that takes an argument,
23 the argument value is returned here.
24 Also, when `ordering' is RETURN_IN_ORDER,
25 each non-option ARGV-element is returned here. */
29 /* Index in ARGV of the next element to be scanned.
30 This is used for communication to and from the caller
31 and for communication between successive calls to `getopt'.
33 On entry to `getopt', zero means this is the first call; initialize.
35 When `getopt' returns EOF, this is the index of the first of the
36 non-option elements that the caller should itself scan.
38 Otherwise, `optind' communicates from one call to the next
39 how much of ARGV has been scanned so far. */
43 /* Callers store zero here to inhibit the error message `getopt' prints
44 for unrecognized options. */
48 /* Describe the long-named options requested by the application.
49 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
50 of `struct option' terminated by an element containing a name which is
53 The field `has_arg' is:
54 no_argument (or 0) if the option does not take an argument,
55 required_argument (or 1) if the option requires an argument,
56 optional_argument (or 2) if the option takes an optional argument.
58 If the field `flag' is not NULL, it points to a variable that is set
59 to the value given in the field `val' when the option is found, but
60 left unchanged if the option is not found.
62 To have a long-named option do something other than set an `int' to
63 a compiled-in constant, such as set a value from `optarg', set the
64 option's `flag' field to zero and its `val' field to a nonzero
65 value (the equivalent single-letter option character, if there is
66 one). For long options that have a zero `flag' field, `getopt'
67 returns the contents of the `val' field. */
76 /* has_arg can't be an enum because some compilers complain about
77 type mismatches in all the code that assumes it is an int. */
83 /* Names for the values of the `has_arg' field of `struct option'. */
93 extern int getopt (int argc
, char *const *argv
, const char *shortopts
);
94 extern int getopt_long (int argc
, char *const *argv
, const char *shortopts
,
95 const struct option
*longopts
, int *longind
);
96 extern int getopt_long_only (int argc
, char *const *argv
,
97 const char *shortopts
,
98 const struct option
*longopts
, int *longind
);
100 /* Internal only. Users should not call this directly. */
101 extern int _getopt_internal (int argc
, char *const *argv
,
102 const char *shortopts
,
103 const struct option
*longopts
, int *longind
,
105 #else /* not __STDC__ */
106 extern int getopt ();
107 extern int getopt_long ();
108 extern int getopt_long_only ();
110 extern int _getopt_internal ();
111 #endif /* not __STDC__ */
113 #endif /* _GETOPT_H */
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