contrib/dhcp-3.0/omapip/inet_addr.c

   1 /*      $NetBSD: inet_addr.c,v 1.6 1996/02/02 15:22:23 mrg Exp $        */
   2
   3 /*
   4  * Copyright (c) 1983, 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #if defined(LIBC_SCCS) && !defined(lint)
  37 #if 0
  38 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
  39 #else
  40 static char rcsid[] = "$NetBSD: inet_addr.c,v 1.6 1996/02/02 15:22:23 mrg Exp $";
  41 #endif
  42 #endif /* LIBC_SCCS and not lint */
  43
  44 #ifndef lint
  45 static char copyright[] =
  46 "$Id: inet_addr.c,v 1.1 2000/09/20 00:01:50 mellon Exp $ Copyright (c) 1983, 1990, 1993 The Regents of the University of California.  All rights reserved.\n";
  47 #endif /* not lint */
  48
  49 #include "omapip/omapip_p.h"
  50
  51 #ifdef NEED_INET_ATON
  52 /*
  53  * Check whether "cp" is a valid ascii representation
  54  * of an Internet address and convert to a binary address.
  55  * Returns 1 if the address is valid, 0 if not.
  56  * This replaces inet_addr, the return value from which
  57  * cannot distinguish between failure and a local broadcast address.
  58  */
  59 int
  60 inet_aton(cp, addr)
  61         const char *cp;
  62         struct in_addr *addr;
  63 {
  64         register u_long val;
  65         register int base, n;
  66         register char c;
  67         u_int parts[4];
  68         register u_int *pp = parts;
  69
  70         for (;;) {
  71                 /*
  72                  * Collect number up to ``.''.
  73                  * Values are specified as for C:
  74                  * 0x=hex, 0=octal, other=decimal.
  75                  */
  76                 val = 0; base = 10;
  77                 if (*cp == '0') {
  78                         if (*++cp == 'x' || *cp == 'X')
  79                                 base = 16, cp++;
  80                         else
  81                                 base = 8;
  82                 }
  83                 while ((c = *cp) != '\0') {
  84                         if (isascii(c) && isdigit(c)) {
  85                                 val = (val * base) + (c - '0');
  86                                 cp++;
  87                                 continue;
  88                         }
  89                         if (base == 16 && isascii(c) && isxdigit(c)) {
  90                                 val = (val << 4) +
  91                                         (c + 10 - (islower(c) ? 'a' : 'A'));
  92                                 cp++;
  93                                 continue;
  94                         }
  95                         break;
  96                 }
  97                 if (*cp == '.') {
  98                         /*
  99                          * Internet format:
 100                          *      a.b.c.d
 101                          *      a.b.c   (with c treated as 16-bits)
 102                          *      a.b     (with b treated as 24 bits)
 103                          */
 104                         if (pp >= parts + 3 || val > 0xff)
 105                                 return (0);
 106                         *pp++ = val, cp++;
 107                 } else
 108                         break;
 109         }
 110         /*
 111          * Check for trailing characters.
 112          */
 113         if (*cp && (!isascii(*cp) || !isspace(*cp)))
 114                 return (0);
 115         /*
 116          * Concoct the address according to
 117          * the number of parts specified.
 118          */
 119         n = pp - parts + 1;
 120         switch (n) {
 121
 122         case 0:
 123                 return (0);             /* initial nondigit */
 124
 125         case 1:                         /* a -- 32 bits */
 126                 break;
 127
 128         case 2:                         /* a.b -- 8.24 bits */
 129                 if (val > 0xffffff)
 130                         return (0);
 131                 val |= parts[0] << 24;
 132                 break;
 133
 134         case 3:                         /* a.b.c -- 8.8.16 bits */
 135                 if (val > 0xffff)
 136                         return (0);
 137                 val |= (parts[0] << 24) | (parts[1] << 16);
 138                 break;
 139
 140         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
 141                 if (val > 0xff)
 142                         return (0);
 143                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 144                 break;
 145         }
 146         if (addr)
 147                 addr->s_addr = htonl(val);
 148         return (1);
 149 }
 150 #endif