lib/ip/inet_network.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)inet_network.c      8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37
  38 #include <sys/types.h>
  39 #include <ctype.h>
  40 #include <net/gen/in.h>
  41 #include <net/gen/inet.h>
  42
  43 #define INADDR_NONE     ((ipaddr_t) -1)
  44
  45 /*
  46  * Internet network address interpretation routine.
  47  * The library routines call this routine to interpret
  48  * network numbers.
  49  */
  50 ipaddr_t
  51 inet_network(cp)
  52         register const char *cp;
  53 {
  54         register ipaddr_t val, base, n;
  55         register char c;
  56         ipaddr_t parts[4], *pp = parts;
  57         register int i;
  58
  59 again:
  60         val = 0; base = 10;
  61         if (*cp == '0')
  62                 base = 8, cp++;
  63         if (*cp == 'x' || *cp == 'X')
  64                 base = 16, cp++;
  65         while (c = *cp) {
  66                 if (isdigit(c)) {
  67                         val = (val * base) + (c - '0');
  68                         cp++;
  69                         continue;
  70                 }
  71                 if (base == 16 && isxdigit(c)) {
  72                         val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
  73                         cp++;
  74                         continue;
  75                 }
  76                 break;
  77         }
  78         if (*cp == '.') {
  79                 if (pp >= parts + 4)
  80                         return (INADDR_NONE);
  81                 *pp++ = val, cp++;
  82                 goto again;
  83         }
  84         if (*cp && !isspace(*cp))
  85                 return (INADDR_NONE);
  86         *pp++ = val;
  87         n = pp - parts;
  88         if (n > 4)
  89                 return (INADDR_NONE);
  90         for (val = 0, i = 0; i < n; i++) {
  91                 val <<= 8;
  92                 val |= parts[i] & 0xff;
  93         }
  94         return (val);
  95 }