/*                                                                        data.h
        declarations for data.c                                               */

extern int num_cities;
extern int num_roads;

struct rentry;

typedef struct centry
{ char *name;
  int index;
  float lon, lat;
  struct rentry *roads;
  struct centry *next; }       city_record;

typedef struct rentry
{ char *name;
  float length;
  city_record *end1, *end2;
  struct rentry *next; }       road_record;

extern road_record ***adjacency_matrix;
extern city_record **city_list;

/*  these two constants are used as 2nd argument to read_road_file */
#define MAKE_ADJACENCY_MATRIX 1
#define MAKE_GRAPH 2
int read_road_file(char *name, int wanted);
int read_city_file(char *name);

char *direction(city_record *c1, city_record *c2);
city_record *find_in_dictionary(char *name);

city_record *read_city(FILE *f);

void print_city_data(void);
void print_adjacency_matrix(void);

void read_data(void);
void print_data(void);