plotutils-graph-patches-lloda/include/getopt.h

#ifndef _GNU_GETOPT_H
#define _GNU_GETOPT_H 1

/* Declarations for GNU getopt. */

/* 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;

/* Set to an option character which was unrecognized.  */

extern int optopt;

/* 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
{
  const char *name;
  /* 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'.  */

#define	no_argument		0
#define required_argument	1
#define optional_argument	2

/* Support declarations of C linkage in C++, for functions not declared in
   C headers the way they should be. */
#ifndef __C_LINKAGE
#ifdef __cplusplus
# define __C_LINKAGE "C"
#else
# define __C_LINKAGE		/* empty */
#endif
#endif /* not __C_LINKAGE */

extern __C_LINKAGE int gnu_getopt (int argc, char *const *argv, const char *shortopts);
extern __C_LINKAGE int getopt_long (int argc, char *const *argv, const char *shortopts, const struct option *longopts, int *longind);
extern __C_LINKAGE 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 __C_LINKAGE int _getopt_internal (int argc, char *const *argv, const char *shortopts, const struct option *longopts, int *longind, int long_only);

#endif