Annotation of embedaddon/mtr/portability/getopt.h, revision 1.1.1.1
1.1 misho 1: /* Declarations for getopt.
2: Copyright (C) 1989-1994,1996-1999,2001,2003,2004
3: Free Software Foundation, Inc.
4: This file is part of the GNU C Library.
5:
6: The GNU C Library is free software; you can redistribute it and/or
7: modify it under the terms of the GNU Lesser General Public
8: License as published by the Free Software Foundation version 2.
9:
10: The GNU C Library is distributed in the hope that it will be useful,
11: but WITHOUT ANY WARRANTY; without even the implied warranty of
12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13: Lesser General Public License for more details.
14:
15: You should have received a copy of the GNU Lesser General Public
16: License along with the GNU C Library; if not, write to the Free
17: Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18: 02111-1307 USA. */
19:
20: #ifndef _GETOPT_H
21:
22: #ifndef __need_getopt
23: #define _GETOPT_H 1
24: #endif
25:
26: /* If __GNU_LIBRARY__ is not already defined, either we are being used
27: standalone, or this is the first header included in the source file.
28: If we are being used with glibc, we need to include <features.h>, but
29: that does not exist if we are standalone. So: if __GNU_LIBRARY__ is
30: not defined, include <ctype.h>, which will pull in <features.h> for us
31: if it's from glibc. (Why ctype.h? It's guaranteed to exist and it
32: doesn't flood the namespace with stuff the way some other headers do.) */
33: #if !defined __GNU_LIBRARY__
34: # include <ctype.h>
35: #endif
36:
37: #ifndef __THROW
38: # ifndef __GNUC_PREREQ
39: # define __GNUC_PREREQ(maj, min) (0)
40: # endif
41: # if defined __cplusplus && __GNUC_PREREQ (2,8)
42: # define __THROW throw ()
43: # else
44: # define __THROW
45: # endif
46: #endif
47:
48: #ifdef __cplusplus
49: extern "C" {
50: #endif
51:
52: /* For communication from `getopt' to the caller.
53: When `getopt' finds an option that takes an argument,
54: the argument value is returned here.
55: Also, when `ordering' is RETURN_IN_ORDER,
56: each non-option ARGV-element is returned here. */
57:
58: extern char *optarg;
59:
60: /* Index in ARGV of the next element to be scanned.
61: This is used for communication to and from the caller
62: and for communication between successive calls to `getopt'.
63:
64: On entry to `getopt', zero means this is the first call; initialize.
65:
66: When `getopt' returns -1, this is the index of the first of the
67: non-option elements that the caller should itself scan.
68:
69: Otherwise, `optind' communicates from one call to the next
70: how much of ARGV has been scanned so far. */
71:
72: extern int optind;
73:
74: /* Callers store zero here to inhibit the error message `getopt' prints
75: for unrecognized options. */
76:
77: extern int opterr;
78:
79: /* Set to an option character which was unrecognized. */
80:
81: extern int optopt;
82:
83: #ifndef __need_getopt
84: /* Describe the long-named options requested by the application.
85: The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
86: of `struct option' terminated by an element containing a name which is
87: zero.
88:
89: The field `has_arg' is:
90: no_argument (or 0) if the option does not take an argument,
91: required_argument (or 1) if the option requires an argument,
92: optional_argument (or 2) if the option takes an optional argument.
93:
94: If the field `flag' is not NULL, it points to a variable that is set
95: to the value given in the field `val' when the option is found, but
96: left unchanged if the option is not found.
97:
98: To have a long-named option do something other than set an `int' to
99: a compiled-in constant, such as set a value from `optarg', set the
100: option's `flag' field to zero and its `val' field to a nonzero
101: value (the equivalent single-letter option character, if there is
102: one). For long options that have a zero `flag' field, `getopt'
103: returns the contents of the `val' field. */
104:
105: struct option
106: {
107: const char *name;
108: /* has_arg can't be an enum because some compilers complain about
109: type mismatches in all the code that assumes it is an int. */
110: int has_arg;
111: int *flag;
112: int val;
113: };
114:
115: /* Names for the values of the `has_arg' field of `struct option'. */
116:
117: #define no_argument 0
118: #define required_argument 1
119: #define optional_argument 2
120: #endif /* need getopt */
121:
122:
123: /* Get definitions and prototypes for functions to process the
124: arguments in ARGV (ARGC of them, minus the program name) for
125: options given in OPTS.
126:
127: Return the option character from OPTS just read. Return -1 when
128: there are no more options. For unrecognized options, or options
129: missing arguments, `optopt' is set to the option letter, and '?' is
130: returned.
131:
132: The OPTS string is a list of characters which are recognized option
133: letters, optionally followed by colons, specifying that that letter
134: takes an argument, to be placed in `optarg'.
135:
136: If a letter in OPTS is followed by two colons, its argument is
137: optional. This behavior is specific to the GNU `getopt'.
138:
139: The argument `--' causes premature termination of argument
140: scanning, explicitly telling `getopt' that there are no more
141: options.
142:
143: If OPTS begins with `--', then non-option arguments are treated as
144: arguments to the option '\0'. This behavior is specific to the GNU
145: `getopt'. */
146:
147: #ifdef __GNU_LIBRARY__
148: /* Many other libraries have conflicting prototypes for getopt, with
149: differences in the consts, in stdlib.h. To avoid compilation
150: errors, only prototype getopt for the GNU C library. */
151: extern int getopt (int ___argc, char *const *___argv, const char *__shortopts)
152: __THROW;
153: #else /* not __GNU_LIBRARY__ */
154: extern int getopt ();
155: #endif /* __GNU_LIBRARY__ */
156:
157: #ifndef __need_getopt
158: extern int getopt_long (int ___argc, char *const *___argv,
159: const char *__shortopts,
160: const struct option *__longopts, int *__longind)
161: __THROW;
162: extern int getopt_long_only (int ___argc, char *const *___argv,
163: const char *__shortopts,
164: const struct option *__longopts, int *__longind)
165: __THROW;
166:
167: #endif
168:
169: #ifdef __cplusplus
170: }
171: #endif
172:
173: /* Make sure we later can get all the definitions and declarations. */
174: #undef __need_getopt
175:
176: #endif /* getopt.h */
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