itch.c

typedef char* itch_msg;                  // message content only
typedef void (*itch_handler)(itch_msg); // message handler func type
typedef itch_handler itch_map[122];     // map of message name and func ptr

// emit looks up the data in itch_map and calls appropriate function
void itch_emit(itch_map* m, char* data);

// Handlers

#define MSG_SYSTEM_EVENT 'S'
void msg_system_event(itch_msg msg);
#define MSG_STOCK_DIRECTORY 'R'
void msg_stock_directory(itch_msg msg);
#define MSG_STOCK_TRADE 'H'
void msg_stock_trade(itch_msg msg);

#include <stdlib.h>
#include <stdio.h>

#include "itch.h"

void itch_add_handler(itch_map i_map, char c, itch_handler i_handler) {

    i_map[(int)c] = i_handler;
}

void itch_emit(itch_map* m, char* msg) {

    itch_handler handler = (*m)[(int)msg[1]];
    //printf("Got event %c with len %i\n", data[1], data[0]);
    if (handler) {
        handler(msg);
    }

}