#ifndef MARISA_CMDOPT_H_

#define MARISA_CMDOPT_H_

#ifdef __cplusplus

extern "C" {

#endif

typedef struct cmdopt_option_ {

  // `name' specifies the name of this option.

  // An array of options must be terminated with an option whose name == NULL.

  const char *name;

  // `has_name' specifies whether an option takes an argument or not.

  // 0 specifies that this option does not have any argument.

  // 1 specifies that this option has an argument.

  // 2 specifies that this option may have an argument.

  int  has_arg;

  // `flag' specifies an integer variable which is overwritten by cmdopt_next()

  // with its return value.

  int *flag;

  // `val' specifies a return value of cmdopt_next(). This value is returned

  // when cmdopt_next() finds this option.

  int  val;

} cmdopt_option;

typedef struct cmdopt_t_ {

  // Command line arguments.

  int    argc;

  char **argv;

  // Option settings.

  const cmdopt_option *longopts;

  const char          *optstring;

  int   optind;     // Index of the next argument.

  char *nextchar;   // Next character.

  char *optarg;     // Argument of the last option.

  int   optopt;     // Label of the last option.

  char *optlong;    // Long option.

  int   opterr;     // Warning level (0: nothing, 1: warning, 2: all).

  int   longindex;  // Index of the last long option.

  int   optnum;     // Number of options.

} cmdopt_t;

// cmdopt_init() initializes a cmdopt_t for successive cmdopt_next()s.

void cmdopt_init(cmdopt_t *h, int argc, char **argv,

    const char *optstring, const cmdopt_option *longopts);

// cmdopt_get() analyzes command line arguments and gets the next option.

int cmdopt_get(cmdopt_t *h);

#ifdef  __cplusplus

}  // extern "C"

#endif

#endif  // MARISA_CMDOPT_H_