#include <stdio.h>
#include <stdlib.h>
#include <sys/io.h>
#include <ctype.h>
#define coma 0x300
#define comb 0x308
#define comc 0x310
#define comd 0x318
#define come 0x320
#define comf 0x328
#define comg 0x330
#define comh 0x338
#define irq 0x5

unsigned int base = 0x200;

unsigned int AskForBaseAddress(unsigned int OldOne){
   char msg[4];
   unsigned int NewOne = 0;
   int index = 0;
   int letter;
   puts("Please enter Base Address of 104-COM-8SM Board");
   puts("Input should be 4 HEX numbers: 0350, 0200, etc");
   puts("Then press ENTER");
   while((letter = getchar())!='\n')
    	msg[index++] = letter;
   sscanf(msg, "%x", &NewOne);
   return((NewOne>=0x1000)&&(NewOne<=0xf3f0)) ? NewOne : OldOne;
}//Ask

void IOPermission()
{
    if(iopl(3)<0)
    {
	fprintf(stderr, "NO IO PERMISSION (Are you logged in as Root?)\n");
	    exit(EXIT_FAILURE);
    }else
	puts("Write permission granted to I/O Ports");
}//IOPermission

void eepromWrite(int x, int y)
{
   long int pause;

   outb(x, base + 1);
   for (pause = 0; pause < 1000000; pause++);
   outb(y, base + 2);
   for (pause = 0; pause < 1000000; pause++);
}

int main(void)
{
   printf("This program will set the base addresses of the com ports in the eeprom.\n");
   base = AskForBaseAddress(base);
   IOPermission();
   eepromWrite(1, coma >> 3);
   printf("COMA set to 0x%X\n", coma);
   eepromWrite(2, comb >> 3);
   printf("COMB set to 0x%X\n", comb);
   eepromWrite(3, comc >> 3);
   printf("COMC set to 0x%X\n", comc);
   eepromWrite(4, comd >> 3);
   printf("COMD set to 0x%X\n", comd);
   eepromWrite(5, come >> 3);
   printf("COME set to 0x%X\n", come);
   eepromWrite(6, comf >> 3);
   printf("COMF set to 0x%X\n", comf);
   eepromWrite(7, comg >> 3);
   printf("COMG set to 0x%X\n", comg);
   eepromWrite(8, comh >> 3);
   printf("COMH set to 0x%X\n", comh);
   eepromWrite(9, irq);
   printf("IRQ set to 0x%X\n\n", irq);
   printf("To change these values, please edit the #defined values in sample0.c\n");
   printf("\nDone.\nReboot to use.\n");
   iopl(0);
   return 0;
}//main