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/*
 *   getlopt.h
 *
 *   Oliver Fromme  <oliver.fromme@heim3.tu-clausthal.de>
 *   Tue Apr  8 07:13:39 MET DST 1997
 */

#include <stdlib.h>
#include <string.h>

extern int loptind;     /* index in argv[] */
extern int loptchr;     /* index in argv[loptind] */
extern char *loptarg;   /* points to argument if present, else to option */

typedef struct {
        char sname;     /* short option name, can be 0 */
        char *lname;    /* long option name, can be 0 */
        int flags;      /* see below */
        void (*func)(char *);   /* called if != 0 (after setting of var) */
        void *var;      /* type is *int, *char or **char, see below */
        int value;
} topt;

#define GLO_ARG  1
#define GLO_CHAR 2
#define GLO_NUM  0

/* flags:
 *      bit 0 = 0 - no argument
 *              if var != NULL
 *                      *var := value or (char)value [see bit 1]
 *              else
 *                      loptarg = &option
 *                      return ((value != 0) ? value : sname)
 *      bit 0 = 1 - argument required
 *              if var != NULL
 *                      *var := atoi(arg) or strdup(arg) [see bit 1]
 *              else
 *                      loptarg = &arg
 *                      return ((value != 0) ? value : sname)
 *
 *      bit 1 = 0 - var is a pointer to an int
 *      bit 1 = 1 - var is a pointer to a char (or string),
 *                      and value is interpreted as char
 *
 * Note: The options definition is terminated by a topt
 *       containing only zeroes.
 */

#define GLO_END         0
#define GLO_UNKNOWN     -1
#define GLO_NOARG       -2
#define GLO_CONTINUE    -3

int getlopt (int argc, char *argv[], topt *opts);

/* return values:
 *      GLO_END         (0)     end of options
 *      GLO_UNKNOWN     (-1)    unknown option *loptarg
 *      GLO_NOARG       (-2)    missing argument
 *      GLO_CONTINUE    (-3)    (reserved for internal use)
 *      else - return value according to flags (see above)
 */

/* EOF */