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prefix.c

/**********************************************************************
 * prefix.c                                                  April 2001
 * Horms                                             horms@verge.net.au
 *
 * aggregate
 * CIDR network aggregation and filtering
 * Copyright (C) 1999-2002  Horms
 * 
 * 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., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307  USA
 *
 **********************************************************************/


#include "prefix.h"
#include <unistd.h>
#include <ctype.h>
#include <stdio.h>


/**********************************************************************
 * prefix_a_to_decimal
 * Convert an prefix given as a string into decimal
 * pre: alleged_prefix: string representing ip address
 *      decimal_prefix: Pointer to a prefix_t to store result in
 * post: 0 on success, decimal_prefix contains value
 *       -1 on error
 **********************************************************************/

int prefix_a_to_decimal(char *alleged_prefix, prefix_t *decimal_prefix){
  char *c;
  char *top;

  if(alleged_prefix==NULL){
    return(-1);
  }

  *decimal_prefix=0;
  for(c=alleged_prefix,top=alleged_prefix+strlen(alleged_prefix);c<top;c++){
    if(!isdigit(*c)){
      return(-1);
    }
    *decimal_prefix *= 10;
    *decimal_prefix += *c - '0';
  }
 
  if(*decimal_prefix>PREFIX_MAX){
    return(-1);
  }

  return(0);
}


/**********************************************************************
 * prefix_decimal_to_a
 * Turn an IP given as a decimal to a dotted quad
 * pre: ip_address: string representing IP address
 *      result: prealocated string to place result in
 * post: NULL if an error occurs
 *       dotted quad representation of IP address otherwise
 *       Note: result is rendered into a static buffer
 **********************************************************************/

static char __prefix_str[PREFIX_STR_LEN];

char *prefix_decimal_to_a(prefix_t prefix){
  snprintf(__prefix_str, PREFIX_STR_LEN, "%d", prefix);

  return(__prefix_str);
}

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