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

void help( void );
void quit( void );

struct Command
{
  char *command;
  void ( *func )( void );
};

struct Command theCommands[ ] =
{
  "exit", quit,
  "help", help,
  "quit", quit,
  NULL, NULL             /* Place Last; No Match */
};

void doCommand( const char *comm )
{
  struct Command *ptr;

  for( ptr = theCommands; ptr->command != NULL; ptr++ )
    if( strcmp( comm, ptr->command ) == 0 )
    {
      ( *ptr->func )( );
      return;
    }

  printf( "Error: unrecognized command\n" );
}

void help( )
{
  printf( "Here's my help!\n" );
}

void quit( )
{
  exit( 0 );
}

int main( )
{
  char command[ 1024 ];

  printf( "> " );
  while( scanf( "%s", command ) == 1 )
  {
    doCommand( command );
    printf( "> " );
  }

  return 0;
}