gistfile1.txt

typedef void (*command_handler)(char*);

struct command_t {
  char *command;
  command_handler handler;
} commands[] = {
  {"command1", func1},
  {"command2", func2},
  {NULL, NULL}
};

// ...

for(int i = 0; commands[i].command != NULL; i++) {
  if(strcmp(commands[i].command, input) == 0) {
    commands[i].handler(data);
    break;
  }
}