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- /* Declarations for getopt.
- Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; either version 2, or (at your option) any
- later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
- #ifndef _GETOPT_H
- #define _GETOPT_H 1
- #ifdef __cplusplus
- extern "C" {
- #endif
- /* For communication from `getopt' to the caller.
- When `getopt' finds an option that takes an argument,
- the argument value is returned here.
- Also, when `ordering' is RETURN_IN_ORDER,
- each non-option ARGV-element is returned here. */
- extern char *optarg;
- /* Index in ARGV of the next element to be scanned.
- This is used for communication to and from the caller
- and for communication between successive calls to `getopt'.
- On entry to `getopt', zero means this is the first call; initialize.
- When `getopt' returns EOF, this is the index of the first of the
- non-option elements that the caller should itself scan.
- Otherwise, `optind' communicates from one call to the next
- how much of ARGV has been scanned so far. */
- extern int optind;
- /* Callers store zero here to inhibit the error message `getopt' prints
- for unrecognized options. */
- extern int opterr;
- /* Describe the long-named options requested by the application.
- The LONG_OPTIONS argument to getopt_long or getopt_long_only is a vector
- of `struct option' terminated by an element containing a name which is
- zero.
- The field `has_arg' is:
- no_argument (or 0) if the option does not take an argument,
- required_argument (or 1) if the option requires an argument,
- optional_argument (or 2) if the option takes an optional argument.
- If the field `flag' is not NULL, it points to a variable that is set
- to the value given in the field `val' when the option is found, but
- left unchanged if the option is not found.
- To have a long-named option do something other than set an `int' to
- a compiled-in constant, such as set a value from `optarg', set the
- option's `flag' field to zero and its `val' field to a nonzero
- value (the equivalent single-letter option character, if there is
- one). For long options that have a zero `flag' field, `getopt'
- returns the contents of the `val' field. */
- struct option
- {
- #if __STDC__
- const char *name;
- #else
- char *name;
- #endif
- /* has_arg can't be an enum because some compilers complain about
- type mismatches in all the code that assumes it is an int. */
- int has_arg;
- int *flag;
- int val;
- };
- /* Names for the values of the `has_arg' field of `struct option'. */
- enum _argtype
- {
- no_argument,
- required_argument,
- optional_argument
- };
- #if __STDC__
- #if defined(__GNU_LIBRARY__)
- /* Many other libraries have conflicting prototypes for getopt, with
- differences in the consts, in stdlib.h. To avoid compilation
- errors, only prototype getopt for the GNU C library. */
- extern int getopt (int argc, char *const *argv, const char *shortopts);
- #else /* not __GNU_LIBRARY__ */
- extern int getopt ();
- #endif /* not __GNU_LIBRARY__ */
- extern int getopt_long (int argc, char *const *argv, const char *shortopts,
- const struct option *longopts, int *longind);
- extern int getopt_long_only (int argc, char *const *argv,
- const char *shortopts,
- const struct option *longopts, int *longind);
- /* Internal only. Users should not call this directly. */
- extern int _getopt_internal (int argc, char *const *argv,
- const char *shortopts,
- const struct option *longopts, int *longind,
- int long_only);
- #else /* not __STDC__ */
- extern int getopt ();
- extern int getopt_long ();
- extern int getopt_long_only ();
- extern int _getopt_internal ();
- #endif /* not __STDC__ */
- #ifdef __cplusplus
- }
- #endif
- #endif /* _GETOPT_H */
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