4 Declarations for getopt.
5 Copyright (C) 1989-1994,1996-1999,2001,2003,2004,2009,2010
6 Free Software Foundation, Inc.
7 This file is part of the GNU C Library.
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30 #include "ws_symbol_export.h"
32 /* If __GNU_LIBRARY__ is not already defined, either we are being used
33 standalone, or this is the first header included in the source file.
34 If we are being used with glibc, we need to include <features.h>, but
35 that does not exist if we are standalone. So: if __GNU_LIBRARY__ is
36 not defined, include <ctype.h>, which will pull in <features.h> for us
37 if it's from glibc. (Why ctype.h? It's guaranteed to exist and it
38 doesn't flood the namespace with stuff the way some other headers do.) */
39 #if !defined __GNU_LIBRARY__
44 # ifndef __GNUC_PREREQ
45 # define __GNUC_PREREQ(maj, min) (0)
47 # if defined __cplusplus && __GNUC_PREREQ (2,8)
48 # define __THROW throw ()
58 /* For communication from `getopt' to the caller.
59 When `getopt' finds an option that takes an argument,
60 the argument value is returned here.
61 Also, when `ordering' is RETURN_IN_ORDER,
62 each non-option ARGV-element is returned here. */
64 WS_DLL_PUBLIC char *optarg;
66 /* Index in ARGV of the next element to be scanned.
67 This is used for communication to and from the caller
68 and for communication between successive calls to `getopt'.
70 On entry to `getopt', zero means this is the first call; initialize.
72 When `getopt' returns -1, this is the index of the first of the
73 non-option elements that the caller should itself scan.
75 Otherwise, `optind' communicates from one call to the next
76 how much of ARGV has been scanned so far. */
78 WS_DLL_PUBLIC int optind;
80 /* Callers store zero here to inhibit the error message `getopt' prints
81 for unrecognized options. */
83 WS_DLL_PUBLIC int opterr;
85 /* Set to an option character which was unrecognized. */
87 WS_DLL_PUBLIC int optopt;
90 /* Describe the long-named options requested by the application.
91 The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
92 of `struct option' terminated by an element containing a name which is
95 The field `has_arg' is:
96 no_argument (or 0) if the option does not take an argument,
97 required_argument (or 1) if the option requires an argument,
98 optional_argument (or 2) if the option takes an optional argument.
100 If the field `flag' is not NULL, it points to a variable that is set
101 to the value given in the field `val' when the option is found, but
102 left unchanged if the option is not found.
104 To have a long-named option do something other than set an `int' to
105 a compiled-in constant, such as set a value from `optarg', set the
106 option's `flag' field to zero and its `val' field to a nonzero
107 value (the equivalent single-letter option character, if there is
108 one). For long options that have a zero `flag' field, `getopt'
109 returns the contents of the `val' field. */
114 /* has_arg can't be an enum because some compilers complain about
115 type mismatches in all the code that assumes it is an int. */
121 /* Names for the values of the `has_arg' field of `struct option'. */
123 # define no_argument 0
124 # define required_argument 1
125 # define optional_argument 2
126 #endif /* need getopt */
129 /* Get definitions and prototypes for functions to process the
130 arguments in ARGV (ARGC of them, minus the program name) for
131 options given in OPTS.
133 Return the option character from OPTS just read. Return -1 when
134 there are no more options. For unrecognized options, or options
135 missing arguments, `optopt' is set to the option letter, and '?' is
138 The OPTS string is a list of characters which are recognized option
139 letters, optionally followed by colons, specifying that that letter
140 takes an argument, to be placed in `optarg'.
142 If a letter in OPTS is followed by two colons, its argument is
143 optional. This behavior is specific to the GNU `getopt'.
145 The argument `--' causes premature termination of argument
146 scanning, explicitly telling `getopt' that there are no more
149 If OPTS begins with `--', then non-option arguments are treated as
150 arguments to the option '\0'. This behavior is specific to the GNU
153 #ifdef __GNU_LIBRARY__
154 /* Many other libraries have conflicting prototypes for getopt, with
155 differences in the consts, in stdlib.h. To avoid compilation
156 errors, only prototype getopt for the GNU C library. */
157 WS_DLL_PUBLIC int getopt (int ___argc, char *const *___argv, const char *__shortopts)
160 # if defined __need_getopt && defined __USE_POSIX2 \
161 && !defined __USE_POSIX_IMPLICITLY && !defined __USE_GNU
162 /* The GNU getopt has more functionality than the standard version. The
163 additional functionality can be disable at runtime. This redirection
164 helps to also do this at runtime. */
166 extern int __REDIRECT_NTH (getopt, (int ___argc, char *const *___argv,
167 const char *__shortopts),
170 extern int __posix_getopt (int ___argc, char *const *___argv,
171 const char *__shortopts) __THROW;
172 # define getopt __posix_getopt
175 #else /* not __GNU_LIBRARY__ */
176 WS_DLL_PUBLIC int getopt (int ___argc, char *const *___argv,
177 const char *__shortopts);
178 #endif /* __GNU_LIBRARY__ */
180 #ifndef __need_getopt
181 WS_DLL_PUBLIC int getopt_long (int ___argc, char *const *___argv,
182 const char *__shortopts,
183 const struct option *__longopts, int *__longind)
185 extern int getopt_long_only (int ___argc, char *const *___argv,
186 const char *__shortopts,
187 const struct option *__longopts, int *__longind)
196 /* Make sure we later can get all the definitions and declarations. */
199 #endif /* getopt.h */