Annotation of embedaddon/quagga/lib/getopt.h, revision 1.1.1.1
1.1 misho 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 bug-glibc@gnu.org.
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: /*
26: * The operating system may or may not provide getopt_long(), and if
27: * so it may or may not be a version we are willing to use. Our
28: * strategy is to declare getopt here, and then provide code unless
29: * the supplied version is adequate. The difficult case is when a
30: * declaration for getopt is provided, as our declaration must match.
31: *
32: * XXX Arguably this version should be named differently, and the
33: * local names defined to refer to the system version when we choose
34: * to use the system version.
35: */
36:
37: #ifdef __cplusplus
38: extern "C" {
39: #endif
40:
41: /* For communication from `getopt' to the caller.
42: When `getopt' finds an option that takes an argument,
43: the argument value is returned here.
44: Also, when `ordering' is RETURN_IN_ORDER,
45: each non-option ARGV-element is returned here. */
46:
47: extern char *optarg;
48:
49: /* Index in ARGV of the next element to be scanned.
50: This is used for communication to and from the caller
51: and for communication between successive calls to `getopt'.
52:
53: On entry to `getopt', zero means this is the first call; initialize.
54:
55: When `getopt' returns -1, this is the index of the first of the
56: non-option elements that the caller should itself scan.
57:
58: Otherwise, `optind' communicates from one call to the next
59: how much of ARGV has been scanned so far. */
60:
61: extern int optind;
62:
63: /* Callers store zero here to inhibit the error message `getopt' prints
64: for unrecognized options. */
65:
66: extern int opterr;
67:
68: /* Set to an option character which was unrecognized. */
69:
70: extern int optopt;
71:
72: /* Describe the long-named options requested by the application.
73: The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
74: of `struct option' terminated by an element containing a name which is
75: zero.
76:
77: The field `has_arg' is:
78: no_argument (or 0) if the option does not take an argument,
79: required_argument (or 1) if the option requires an argument,
80: optional_argument (or 2) if the option takes an optional argument.
81:
82: If the field `flag' is not NULL, it points to a variable that is set
83: to the value given in the field `val' when the option is found, but
84: left unchanged if the option is not found.
85:
86: To have a long-named option do something other than set an `int' to
87: a compiled-in constant, such as set a value from `optarg', set the
88: option's `flag' field to zero and its `val' field to a nonzero
89: value (the equivalent single-letter option character, if there is
90: one). For long options that have a zero `flag' field, `getopt'
91: returns the contents of the `val' field. */
92:
93: struct option
94: {
95: #if defined (__STDC__) && __STDC__
96: const char *name;
97: #else
98: char *name;
99: #endif
100: /* has_arg can't be an enum because some compilers complain about
101: type mismatches in all the code that assumes it is an int. */
102: int has_arg;
103: int *flag;
104: int val;
105: };
106:
107: /* Names for the values of the `has_arg' field of `struct option'. */
108:
109: #define no_argument 0
110: #define required_argument 1
111: #define optional_argument 2
112:
113: #if defined (__STDC__) && __STDC__
114:
115: #if REALLY_NEED_PLAIN_GETOPT
116:
117: /*
118: * getopt is defined in POSIX.2. Assume that if the system defines
119: * getopt that it complies with POSIX.2. If not, an autoconf test
120: * should be written to define NONPOSIX_GETOPT_DEFINITION.
121: */
122: #ifndef NONPOSIX_GETOPT_DEFINITION
123: extern int getopt (int argc, char *const *argv, const char *shortopts);
124: #else /* NONPOSIX_GETOPT_DEFINITION */
125: extern int getopt (void);
126: #endif /* NONPOSIX_GETOPT_DEFINITION */
127:
128: #endif
129:
130:
131: extern int getopt_long (int argc, char *const *argv, const char *shortopts,
132: const struct option *longopts, int *longind);
133: extern int getopt_long_only (int argc, char *const *argv,
134: const char *shortopts,
135: const struct option *longopts, int *longind);
136:
137: /* Internal only. Users should not call this directly. */
138: extern int _getopt_internal (int argc, char *const *argv,
139: const char *shortopts,
140: const struct option *longopts, int *longind,
141: int long_only);
142: #else /* not __STDC__ */
143:
144: #ifdef REALLY_NEED_PLAIN_GETOPT
145: extern int getopt ();
146: #endif /* REALLY_NEED_PLAIN_GETOPT */
147:
148: extern int getopt_long ();
149: extern int getopt_long_only ();
150:
151: extern int _getopt_internal ();
152:
153: #endif /* __STDC__ */
154:
155: #ifdef __cplusplus
156: }
157: #endif
158:
159: #endif /* getopt.h */
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