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1 /* Declarations for getopt.
2    Copyright (C) 1989,90,91,92,93,94,96,97 Free Software Foundation, Inc.
3 
4    NOTE: The canonical source of this file is maintained with the GNU C Library.
5    Bugs can be reported to bug-glibc@gnu.org.
6 
7    This program is free software; you can redistribute it and/or modify it
8    under the terms of the GNU General Public License as published by the
9    Free Software Foundation; either version 2, or (at your option) any
10    later version.
11 
12    This program is distributed in the hope that it will be useful,
13    but WITHOUT ANY WARRANTY; without even the implied warranty of
14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15    GNU General Public License for more details.
16 
17    You should have received a copy of the GNU General Public License
18    along with this program; if not, write to the Free Software
19    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
20    USA.  */
21 
22 #ifndef _GETOPT_H
23 #define _GETOPT_H 1
24 
25 #ifdef	__cplusplus
26 extern "C" {
27 #endif
28 
29 /* For communication from `getopt' to the caller.
30    When `getopt' finds an option that takes an argument,
31    the argument value is returned here.
32    Also, when `ordering' is RETURN_IN_ORDER,
33    each non-option ARGV-element is returned here.  */
34 
35 extern char *optarg;
36 
37 /* Index in ARGV of the next element to be scanned.
38    This is used for communication to and from the caller
39    and for communication between successive calls to `getopt'.
40 
41    On entry to `getopt', zero means this is the first call; initialize.
42 
43    When `getopt' returns -1, this is the index of the first of the
44    non-option elements that the caller should itself scan.
45 
46    Otherwise, `optind' communicates from one call to the next
47    how much of ARGV has been scanned so far.  */
48 
49 extern int optind;
50 
51 /* Callers store zero here to inhibit the error message `getopt' prints
52    for unrecognized options.  */
53 
54 extern int opterr;
55 
56 /* Set to an option character which was unrecognized.  */
57 
58 extern int optopt;
59 
60 /* Describe the long-named options requested by the application.
61    The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
62    of `struct option' terminated by an element containing a name which is
63    zero.
64 
65    The field `has_arg' is:
66    no_argument		(or 0) if the option does not take an argument,
67    required_argument	(or 1) if the option requires an argument,
68    optional_argument 	(or 2) if the option takes an optional argument.
69 
70    If the field `flag' is not NULL, it points to a variable that is set
71    to the value given in the field `val' when the option is found, but
72    left unchanged if the option is not found.
73 
74    To have a long-named option do something other than set an `int' to
75    a compiled-in constant, such as set a value from `optarg', set the
76    option's `flag' field to zero and its `val' field to a nonzero
77    value (the equivalent single-letter option character, if there is
78    one).  For long options that have a zero `flag' field, `getopt'
79    returns the contents of the `val' field.  */
80 
81 struct option
82 {
83 #if defined (__STDC__) && __STDC__
84   const char *name;
85 #else
86   char *name;
87 #endif
88   /* has_arg can't be an enum because some compilers complain about
89      type mismatches in all the code that assumes it is an int.  */
90   int has_arg;
91   int *flag;
92   int val;
93 };
94 
95 /* Names for the values of the `has_arg' field of `struct option'.  */
96 
97 #define	no_argument		0
98 #define required_argument	1
99 #define optional_argument	2
100 
101 #if defined (__STDC__) && __STDC__
102 #ifdef __GNU_LIBRARY__
103 /* Many other libraries have conflicting prototypes for getopt, with
104    differences in the consts, in stdlib.h.  To avoid compilation
105    errors, only prototype getopt for the GNU C library.  */
106 extern int getopt (int argc, char *const *argv, const char *shortopts);
107 #else /* not __GNU_LIBRARY__ */
108 extern int getopt ();
109 #endif /* __GNU_LIBRARY__ */
110 extern int getopt_long (int argc, char *const *argv, const char *shortopts,
111 		        const struct option *longopts, int *longind);
112 extern int getopt_long_only (int argc, char *const *argv,
113 			     const char *shortopts,
114 		             const struct option *longopts, int *longind);
115 
116 /* Internal only.  Users should not call this directly.  */
117 extern int _getopt_internal (int argc, char *const *argv,
118 			     const char *shortopts,
119 		             const struct option *longopts, int *longind,
120 			     int long_only);
121 #else /* not __STDC__ */
122 extern int getopt ();
123 extern int getopt_long ();
124 extern int getopt_long_only ();
125 
126 extern int _getopt_internal ();
127 #endif /* __STDC__ */
128 
129 #ifdef	__cplusplus
130 }
131 #endif
132 
133 #endif /* getopt.h */
134