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/*
* Copyright (C) 2001-2003 Daniel Kelly
* Copyright (C) 2009 Peter Pentchev
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include "prips.h"
#include "except.h"
static void fill(int octet[4][256]);
/*****************************************************************/
/* 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])
{
size_t i;
int 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);
}
static 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(uint32_t *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((int)((*current >> 24) & 0xff) == octet[i][j])
{
*current += (uint32_t)(1 << 24) -1;
return(1);
}
break;
case 1:
if((int)((*current >> 16) & 0xff) == octet[i][j])
{
*current += (uint32_t)(1 << 16) -1;
return(1);
}
break;
case 2:
if((int)((*current >> 8) & 0xff) == octet[i][j])
{
*current += (uint32_t)(1 << 8) -1;
return(1);
}
break;
case 3:
if((int)(*current & 0xff) == octet[i][j])
return(1);
break;
}
}
}
return(0);
}
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