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#ifndef _GETOPT_H
#define _GETOPT_H
/** @file
*
* Parse command-line options
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stddef.h>
enum getopt_argument_requirement {
/** Option does not take an argument */
no_argument = 0,
/** Option requires an argument */
required_argument = 1,
/** Option may have an argument */
optional_argument = 2,
};
/** A long option, as used for getopt_long() */
struct option {
/** Long name of this option */
const char *name;
/** Option takes an argument
*
* Must be one of @c no_argument, @c required_argument, or @c
* optional_argument.
*/
int has_arg;
/** Location into which to store @c val, or NULL.
*
* See the description for @c val for more details.
*/
int *flag;
/** Value to return
*
* If @c flag is NULL, then this is the value that will be
* returned by getopt_long() when this option is found, and
* should therefore be set to the equivalent short option
* character.
*
* If @c flag is non-NULL, then this value will be written to
* the location pointed to by @flag, and getopt_long() will
* return 0.
*/
int val;
};
extern char *optarg;
extern int optind;
extern int nextchar;
extern int optopt;
extern int getopt_long ( int argc, char * const argv[], const char *optstring,
const struct option *longopts, int *longindex );
/**
* Parse command-line options
*
* @v argv Argument count
* @v argv Argument list
* @v optstring Option specification string
* @ret option Option found, or -1 for no more options
*
* See getopt_long() for full details.
*/
static inline int getopt ( int argc, char * const argv[],
const char *optstring ) {
static const struct option no_options[] = {
{ NULL, 0, NULL, 0 }
};
return getopt_long ( argc, argv, optstring, no_options, NULL );
}
/**
* Reset getopt() internal state
*
* Due to a limitation of the POSIX getopt() API, it is necessary to
* add a call to reset_getopt() before each set of calls to getopt()
* or getopt_long(). This arises because POSIX assumes that each
* process will parse command line arguments no more than once; this
* assumption is not valid within Etherboot. We work around the
* limitation by arranging for execv() to call reset_getopt() before
* executing the command.
*/
static inline void reset_getopt ( void ) {
optind = 1;
nextchar = 0;
}
#endif /* _GETOPT_H */
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