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#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <math.h>
#include <assert.h>
#include "except.h"
/*****************************************************************/
/* This function parses the exception string and adds all of the */
/* exceptions to the proper place in the exception table. A '.' */
/* is used to separate octets. Numbers are separated by any non */
/* digit other than the '.', which has special meaning. */
/*****************************************************************/
int set_exceptions(char *exp, int octet[4][256])
{
int i, excludeind = 0, bufferind = 0, octind = 0;
char buffer[4];
fill(octet);
for(i = 0; i < strlen(exp) + 1; i++)
{
if( isdigit(exp[i]))
{
buffer[bufferind] = exp[i];
bufferind++;
assert(bufferind != 4); /* potential overflow... */
}
else
{
if(bufferind)
{
buffer[bufferind] = '\0';
octet[octind][excludeind] = atoi(buffer);
bufferind = 0;
excludeind++;
}
if(exp[i] == '.')
{
octind++;
excludeind = 0;
}
}
}
return(0);
}
void fill(int octet[4][256])
{
register int i, j;
for(i = 0; i < 4; i++)
for(j = 0; j < 256; j++)
octet[i][j] = -1;
}
/*******************************************************************/
/* Compares each octet against the list of exceptions for that */
/* octet. If the octet is in the list of exceptions the 'current' */
/* argument is incremented so that the 'current' variable is moved */
/* up one octet. I hope to God this makes sense... it's late. I'm */
/* tired. */
/*******************************************************************/
int except(unsigned long *current, int octet[4][256])
{
register int i, j;
for(i = 0; i < 4; i++)
{
for(j = 0; j < 256; j++)
{
switch(i)
{
case 0:
if(((*current & 0xff000000) >> 24) == octet[i][j])
{
*current += (unsigned long)pow(2, 24) -1;
return(1);
}
break;
case 1:
if(((*current & 0x00ff0000) >> 16) == octet[i][j])
{
*current += (unsigned long)pow(2, 16) -1;
return(1);
}
break;
case 2:
if(((*current & 0x0000ff00) >> 8) == octet[i][j])
{
*current += (unsigned long)pow(2, 8) -1;
return(1);
}
break;
case 3:
if((*current & 0x000000ff) == octet[i][j])
return(1);
break;
}
}
}
return(0);
}
void _spil(int octet[4][256])
{
int i, j;
for(i = 0; i < 4; i++)
{
for(j = 0; j < 256; j++)
{
if(octet[i][j] == -1)
break;
printf("[%d, %d]: %d\n", i, j, octet[i][j]);
}
}
}
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