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1 office 1 /* Declarations for gnu_getopt.
2 Copyright (C) 1989,90,91,92,93,94,96,97 Free Software Foundation, Inc.
3  
4 This file is part of the GNU C Library. Its master source is NOT part of
5 the C library, however. The master source lives in /gd/gnu/lib.
6  
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Library General Public License as
9 published by the Free Software Foundation; either version 2 of the
10 License, or (at your option) any later version.
11  
12 The GNU C Library 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 GNU
15 Library General Public License for more details.
16  
17 You should have received a copy of the GNU Library General Public
18 License along with the GNU C Library; see the file COPYING.LIB. If not,
19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
21  
22 /*
23 * modified July 9, 1999 by mark gates <mgates@nlanr.net>
24 * Dec 17, 1999
25 *
26 * renamed all functions and variables by prepending "gnu_"
27 * removed/redid a bunch of stuff under the assumption we're
28 * using a modern standard C compiler.
29 *
30 * $Id: gnu_getopt.h,v 1.1.1.1 2004/05/18 01:50:44 kgibbs Exp $
31 */
32  
33 #ifndef _GETOPT_H
34 #define _GETOPT_H 1
35  
36 #ifdef __cplusplus
37 extern "C" {
38 #endif
39  
40 /* For communication from `gnu_getopt' to the caller.
41 When `gnu_getopt' finds an option that takes an argument,
42 the argument value is returned here.
43 Also, when `ordering' is RETURN_IN_ORDER,
44 each non-option ARGV-element is returned here. */
45  
46 extern char *gnu_optarg;
47  
48 /* Index in ARGV of the next element to be scanned.
49 This is used for communication to and from the caller
50 and for communication between successive calls to `gnu_getopt'.
51  
52 On entry to `gnu_getopt', zero means this is the first call; initialize.
53  
54 When `gnu_getopt' returns -1, this is the index of the first of the
55 non-option elements that the caller should itself scan.
56  
57 Otherwise, `gnu_optind' communicates from one call to the next
58 how much of ARGV has been scanned so far. */
59  
60 extern int gnu_optind;
61  
62 /* Callers store zero here to inhibit the error message `gnu_getopt' prints
63 for unrecognized options. */
64  
65 extern int gnu_opterr;
66  
67 /* Set to an option character which was unrecognized. */
68  
69 extern int gnu_optopt;
70  
71 /* Describe the long-named options requested by the application.
72 The LONG_OPTIONS argument to gnu_getopt_long or getopt_long_only is a vector
73 of `struct option' terminated by an element containing a name which is
74 zero.
75  
76 The field `has_arg' is:
77 no_argument (or 0) if the option does not take an argument,
78 required_argument (or 1) if the option requires an argument,
79 optional_argument (or 2) if the option takes an optional argument.
80  
81 If the field `flag' is not NULL, it points to a variable that is set
82 to the value given in the field `val' when the option is found, but
83 left unchanged if the option is not found.
84  
85 To have a long-named option do something other than set an `int' to
86 a compiled-in constant, such as set a value from `gnu_optarg', set the
87 option's `flag' field to zero and its `val' field to a nonzero
88 value (the equivalent single-letter option character, if there is
89 one). For long options that have a zero `flag' field, `gnu_getopt'
90 returns the contents of the `val' field. */
91  
92 /* has_arg can't be an enum because some compilers complain about
93 type mismatches in all the code that assumes it is an int. */
94  
95 struct option {
96 const char *name;
97 int has_arg;
98 int *flag;
99 int val;
100 };
101  
102 /* Names for the values of the `has_arg' field of `struct option'. */
103  
104 #define no_argument 0
105 #define required_argument 1
106 #define optional_argument 2
107  
108 int gnu_getopt( int argc,
109 char *const *argv,
110 const char *shortopts );
111  
112 int gnu_getopt_long( int argc,
113 char *const *argv,
114 const char *shortopts,
115 const struct option *longopts,
116 int *longind );
117  
118 int gnu_getopt_long_only( int argc,
119 char *const *argv,
120 const char *shortopts,
121 const struct option *longopts,
122 int *longind );
123  
124 /* Internal only. Users should not call this directly. */
125 int _gnu_getopt_internal( int argc,
126 char *const *argv,
127 const char *shortopts,
128 const struct option *longopts,
129 int *longind,
130 int long_only );
131  
132 #ifdef __cplusplus
133 } /* end extern "C" */
134 #endif
135  
136 #endif /* _GETOPT_H */