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1.1 root 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 [email protected].
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 */
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