getopt.h - enscript - GNU Enscript
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getopt.h (4695B)
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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 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., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, 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 */