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1.1 root 1: /* Declarations for getopt.
2: Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
3:
4: This program is free software; you can redistribute it and/or modify it
5: under the terms of the GNU General Public License as published by the
6: Free Software Foundation; either version 2, or (at your option) any
7: later version.
8:
9: This program is distributed in the hope that it will be useful,
10: but WITHOUT ANY WARRANTY; without even the implied warranty of
11: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12: GNU General Public License for more details.
13:
14: You should have received a copy of the GNU General Public License
15: along with this program; if not, write to the Free Software
16: Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
17:
18: This file was modified slightly by Ian Lance Taylor, November 1992,
19: for Taylor UUCP. */
20:
21: #ifndef _GETOPT_H
22: #define _GETOPT_H 1
23:
24: #ifdef __cplusplus
25: extern "C" {
26: #endif
27:
28: /* Ian Lance Taylor <[email protected]> added the following defines for
29: Taylor UUCP. This avoids reported conflicts with system getopt
30: definitions. */
31: #define getopt gnu_getopt
32: #define optarg gnu_optarg
33: #define optind gnu_optind
34: #define opterr gnu_opterr
35:
36: /* For communication from `getopt' to the caller.
37: When `getopt' finds an option that takes an argument,
38: the argument value is returned here.
39: Also, when `ordering' is RETURN_IN_ORDER,
40: each non-option ARGV-element is returned here. */
41:
42: extern char *optarg;
43:
44: /* Index in ARGV of the next element to be scanned.
45: This is used for communication to and from the caller
46: and for communication between successive calls to `getopt'.
47:
48: On entry to `getopt', zero means this is the first call; initialize.
49:
50: When `getopt' returns EOF, this is the index of the first of the
51: non-option elements that the caller should itself scan.
52:
53: Otherwise, `optind' communicates from one call to the next
54: how much of ARGV has been scanned so far. */
55:
56: extern int optind;
57:
58: /* Callers store zero here to inhibit the error message `getopt' prints
59: for unrecognized options. */
60:
61: extern int opterr;
62:
63: /* Describe the long-named options requested by the application.
64: The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
65: of `struct option' terminated by an element containing a name which is
66: zero.
67:
68: The field `has_arg' is:
69: no_argument (or 0) if the option does not take an argument,
70: required_argument (or 1) if the option requires an argument,
71: optional_argument (or 2) if the option takes an optional argument.
72:
73: If the field `flag' is not NULL, it points to a variable that is set
74: to the value given in the field `val' when the option is found, but
75: left unchanged if the option is not found.
76:
77: To have a long-named option do something other than set an `int' to
78: a compiled-in constant, such as set a value from `optarg', set the
79: option's `flag' field to zero and its `val' field to a nonzero
80: value (the equivalent single-letter option character, if there is
81: one). For long options that have a zero `flag' field, `getopt'
82: returns the contents of the `val' field. */
83:
84: struct option
85: {
86: const char *name;
87: /* has_arg can't be an enum because some compilers complain about
88: type mismatches in all the code that assumes it is an int. */
89: int has_arg;
90: int *flag;
91: int val;
92: };
93:
94: /* Names for the values of the `has_arg' field of `struct option'. */
95:
96: enum _argtype
97: {
98: no_argument,
99: required_argument,
100: optional_argument
101: };
102:
103: extern int getopt P((int argc, char *const *argv, const char *shortopts));
104: extern int getopt_long P((int argc, char *const *argv, const char *shortopts,
105: const struct option *longopts, int *longind));
106: extern int getopt_long_only P((int argc, char *const *argv,
107: const char *shortopts,
108: const struct option *longopts, int *longind));
109:
110: /* Internal only. Users should not call this directly. */
111: extern int _getopt_internal P((int argc, char *const *argv,
112: const char *shortopts,
113: const struct option *longopts, int *longind,
114: int long_only));
115:
116: #ifdef __cplusplus
117: }
118: #endif
119:
120: #endif /* _GETOPT_H */
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