linux/lib/libfreeswan/rangetoa.c

   1 /*
   2  * convert binary form of address range to ASCII
   3  * Copyright (C) 1998, 1999  Henry Spencer.
   4  *
   5  * This library is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU Library General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.  See <http://www.fsf.org/copyleft/lgpl.txt>.
   9  *
  10  * This library is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
  13  * License for more details.
  14  *
  15  * RCSID $Id: rangetoa.c,v 1.1 2004/03/15 20:35:26 as Exp $
  16  */
  17 #include "internal.h"
  18 #include "freeswan.h"
  19
  20 /*
  21  - rangetoa - convert address range to ASCII
  22  */
  23 size_t                          /* space needed for full conversion */
  24 rangetoa(addrs, format, dst, dstlen)
  25 struct in_addr addrs[2];
  26 int format;                     /* character */
  27 char *dst;                      /* need not be valid if dstlen is 0 */
  28 size_t dstlen;
  29 {
  30         size_t len;
  31         size_t rest;
  32         int n;
  33         char *p;
  34
  35         switch (format) {
  36         case 0:
  37                 break;
  38         default:
  39                 return 0;
  40                 break;
  41         }
  42
  43         len = addrtoa(addrs[0], 0, dst, dstlen);
  44         if (len < dstlen)
  45                 for (p = dst + len - 1, n = 3; len < dstlen && n > 0;
  46                                                                 p++, len++, n--)
  47                         *p = '.';
  48         else
  49                 p = NULL;
  50         if (len < dstlen)
  51                 rest = dstlen - len;
  52         else {
  53                 if (dstlen > 0)
  54                         *(dst + dstlen - 1) = '\0';
  55                 rest = 0;
  56         }
  57
  58         len += addrtoa(addrs[1], 0, p, rest);
  59
  60         return len;
  61 }