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comparison include/getopt.h @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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1 /* Declarations for getopt.
2 Copyright 1989, 1990, 1991, 1992, 1993, 1994, 1996, 1997, 1998, 2000,
3 2002 Free Software Foundation, Inc.
4
5 NOTE: The canonical source of this file is maintained with the GNU C Library.
6 Bugs can be reported to bug-glibc@gnu.org.
7
8 This program is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by the
10 Free Software Foundation; either version 2, or (at your option) any
11 later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
21 USA. */
22
23 #ifndef _GETOPT_H
24 #define _GETOPT_H 1
25
26 #ifdef __cplusplus
27 extern "C" {
28 #endif
29
30 /* For communication from `getopt' to the caller.
31 When `getopt' finds an option that takes an argument,
32 the argument value is returned here.
33 Also, when `ordering' is RETURN_IN_ORDER,
34 each non-option ARGV-element is returned here. */
35
36 extern char *optarg;
37
38 /* Index in ARGV of the next element to be scanned.
39 This is used for communication to and from the caller
40 and for communication between successive calls to `getopt'.
41
42 On entry to `getopt', zero means this is the first call; initialize.
43
44 When `getopt' returns -1, this is the index of the first of the
45 non-option elements that the caller should itself scan.
46
47 Otherwise, `optind' communicates from one call to the next
48 how much of ARGV has been scanned so far. */
49
50 extern int optind;
51
52 /* Callers store zero here to inhibit the error message `getopt' prints
53 for unrecognized options. */
54
55 extern int opterr;
56
57 /* Set to an option character which was unrecognized. */
58
59 extern int optopt;
60
61 /* Describe the long-named options requested by the application.
62 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
63 of `struct option' terminated by an element containing a name which is
64 zero.
65
66 The field `has_arg' is:
67 no_argument (or 0) if the option does not take an argument,
68 required_argument (or 1) if the option requires an argument,
69 optional_argument (or 2) if the option takes an optional argument.
70
71 If the field `flag' is not NULL, it points to a variable that is set
72 to the value given in the field `val' when the option is found, but
73 left unchanged if the option is not found.
74
75 To have a long-named option do something other than set an `int' to
76 a compiled-in constant, such as set a value from `optarg', set the
77 option's `flag' field to zero and its `val' field to a nonzero
78 value (the equivalent single-letter option character, if there is
79 one). For long options that have a zero `flag' field, `getopt'
80 returns the contents of the `val' field. */
81
82 struct option
83 {
84 #if defined (__STDC__) && __STDC__
85 const char *name;
86 #else
87 char *name;
88 #endif
89 /* has_arg can't be an enum because some compilers complain about
90 type mismatches in all the code that assumes it is an int. */
91 int has_arg;
92 int *flag;
93 int val;
94 };
95
96 /* Names for the values of the `has_arg' field of `struct option'. */
97
98 #define no_argument 0
99 #define required_argument 1
100 #define optional_argument 2
101
102 #if defined (__STDC__) && __STDC__
103 /* HAVE_DECL_* is a three-state macro: undefined, 0 or 1. If it is
104 undefined, we haven't run the autoconf check so provide the
105 declaration without arguments. If it is 0, we checked and failed
106 to find the declaration so provide a fully prototyped one. If it
107 is 1, we found it so don't provide any declaration at all. */
108 #if !HAVE_DECL_GETOPT
109 #if defined (__GNU_LIBRARY__) || defined (HAVE_DECL_GETOPT)
110 /* Many other libraries have conflicting prototypes for getopt, with
111 differences in the consts, in unistd.h. To avoid compilation
112 errors, only prototype getopt for the GNU C library. */
113 extern int getopt (int argc, char *const *argv, const char *shortopts);
114 #else
115 #ifndef __cplusplus
116 extern int getopt ();
117 #endif /* __cplusplus */
118 #endif
119 #endif /* !HAVE_DECL_GETOPT */
120
121 extern int getopt_long (int argc, char *const *argv, const char *shortopts,
122 const struct option *longopts, int *longind);
123 extern int getopt_long_only (int argc, char *const *argv,
124 const char *shortopts,
125 const struct option *longopts, int *longind);
126
127 /* Internal only. Users should not call this directly. */
128 extern int _getopt_internal (int argc, char *const *argv,
129 const char *shortopts,
130 const struct option *longopts, int *longind,
131 int long_only);
132 #else /* not __STDC__ */
133 extern int getopt ();
134 extern int getopt_long ();
135 extern int getopt_long_only ();
136
137 extern int _getopt_internal ();
138 #endif /* __STDC__ */
139
140 #ifdef __cplusplus
141 }
142 #endif
143
144 #endif /* getopt.h */