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 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful, but
10 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 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., 51 Franklin Street, Fifth Floor, Boston, MA
26 /* For communication from `getopt' to the caller.
27 When `getopt' finds an option that takes an argument,
28 the argument value is returned here.
29 Also, when `ordering' is RETURN_IN_ORDER,
30 each non-option ARGV-element is returned here. */
34 /* Index in ARGV of the next element to be scanned.
35 This is used for communication to and from the caller
36 and for communication between successive calls to `getopt'.
38 On entry to `getopt', zero means this is the first call; initialize.
40 When `getopt' returns EOF, this is the index of the first of the
41 non-option elements that the caller should itself scan.
43 Otherwise, `optind' communicates from one call to the next
44 how much of ARGV has been scanned so far. */
48 /* Callers store zero here to inhibit the error message `getopt' prints
49 for unrecognized options. */
53 /* Describe the long-named options requested by the application.
54 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
55 of `struct option' terminated by an element containing a name which is
58 The field `has_arg' is:
59 no_argument (or 0) if the option does not take an argument,
60 required_argument (or 1) if the option requires an argument,
61 optional_argument (or 2) if the option takes an optional argument.
63 If the field `flag' is not NULL, it points to a variable that is set
64 to the value given in the field `val' when the option is found, but
65 left unchanged if the option is not found.
67 To have a long-named option do something other than set an `int' to
68 a compiled-in constant, such as set a value from `optarg', set the
69 option's `flag' field to zero and its `val' field to a nonzero
70 value (the equivalent single-letter option character, if there is
71 one). For long options that have a zero `flag' field, `getopt'
72 returns the contents of the `val' field. */
81 /* has_arg can't be an enum because some compilers complain about
82 type mismatches in all the code that assumes it is an int. */
88 /* Names for the values of the `has_arg' field of `struct option'. */
91 #define required_argument 1
92 #define optional_argument 2
95 #if defined(__GNU_LIBRARY__)
96 /* Many other libraries have conflicting prototypes for getopt, with
97 differences in the consts, in stdlib.h. To avoid compilation
98 errors, only prototype getopt for the GNU C library. */
99 extern int getopt (int argc, char *const *argv, const char *shortopts);
100 #else /* not __GNU_LIBRARY__ */
102 #endif /* not __GNU_LIBRARY__ */
103 extern int getopt_long (int argc, char *const *argv, const char *shortopts,
104 const struct option *longopts, int *longind);
105 extern int getopt_long_only (int argc, char *const *argv,
106 const char *shortopts,
107 const struct option *longopts, int *longind);
109 /* Internal only. Users should not call this directly. */
110 extern int _getopt_internal (int argc, char *const *argv,
111 const char *shortopts,
112 const struct option *longopts, int *longind,
114 #else /* not __STDC__ */
116 extern int getopt_long();
117 extern int getopt_long_only();
119 extern int _getopt_internal();
120 #endif /* not __STDC__ */
126 #endif /* _GETOPT_H */