dist/dhcp/omapip/inet_addr.c

   1 /*      $NetBSD: inet_addr.c,v 1.2 2003/08/07 09:21:10 agc 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. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #if defined(LIBC_SCCS) && !defined(lint)
  33 #if 0
  34 static char sccsid[] = "@(#)inet_addr.c 8.1 (Berkeley) 6/17/93";
  35 #else
  36 static char rcsid[] = "$NetBSD: inet_addr.c,v 1.6 1996/02/02 15:22:23 mrg Exp $";
  37 #endif
  38 #endif /* LIBC_SCCS and not lint */
  39
  40 #ifndef lint
  41 static char copyright[] =
  42 "$Id: inet_addr.c,v 1.3 2005/08/11 17:13:30 drochner Exp $ Copyright (c) 1983, 1990, 1993 The Regents of the University of California.  All rights reserved.\n";
  43 #endif /* not lint */
  44
  45 #include "omapip/omapip_p.h"
  46
  47 #ifdef NEED_INET_ATON
  48 /*
  49  * Check whether "cp" is a valid ascii representation
  50  * of an Internet address and convert to a binary address.
  51  * Returns 1 if the address is valid, 0 if not.
  52  * This replaces inet_addr, the return value from which
  53  * cannot distinguish between failure and a local broadcast address.
  54  */
  55 int
  56 inet_aton(cp, addr)
  57         const char *cp;
  58         struct in_addr *addr;
  59 {
  60         register u_long val;
  61         register int base, n;
  62         register char c;
  63         u_int parts[4];
  64         register u_int *pp = parts;
  65
  66         for (;;) {
  67                 /*
  68                  * Collect number up to ``.''.
  69                  * Values are specified as for C:
  70                  * 0x=hex, 0=octal, other=decimal.
  71                  */
  72                 val = 0; base = 10;
  73                 if (*cp == '0') {
  74                         if (*++cp == 'x' || *cp == 'X')
  75                                 base = 16, cp++;
  76                         else
  77                                 base = 8;
  78                 }
  79                 while ((c = *cp) != '\0') {
  80                         if (isascii(c) && isdigit(c)) {
  81                                 val = (val * base) + (c - '0');
  82                                 cp++;
  83                                 continue;
  84                         }
  85                         if (base == 16 && isascii(c) && isxdigit(c)) {
  86                                 val = (val << 4) +
  87                                         (c + 10 - (islower(c) ? 'a' : 'A'));
  88                                 cp++;
  89                                 continue;
  90                         }
  91                         break;
  92                 }
  93                 if (*cp == '.') {
  94                         /*
  95                          * Internet format:
  96                          *      a.b.c.d
  97                          *      a.b.c   (with c treated as 16-bits)
  98                          *      a.b     (with b treated as 24 bits)
  99                          */
 100                         if (pp >= parts + 3 || val > 0xff)
 101                                 return (0);
 102                         *pp++ = val, cp++;
 103                 } else
 104                         break;
 105         }
 106         /*
 107          * Check for trailing characters.
 108          */
 109         if (*cp && (!isascii(*cp) || !isspace(*cp)))
 110                 return (0);
 111         /*
 112          * Concoct the address according to
 113          * the number of parts specified.
 114          */
 115         n = pp - parts + 1;
 116         switch (n) {
 117
 118         case 0:
 119                 return (0);             /* initial nondigit */
 120
 121         case 1:                         /* a -- 32 bits */
 122                 break;
 123
 124         case 2:                         /* a.b -- 8.24 bits */
 125                 if (val > 0xffffff)
 126                         return (0);
 127                 val |= parts[0] << 24;
 128                 break;
 129
 130         case 3:                         /* a.b.c -- 8.8.16 bits */
 131                 if (val > 0xffff)
 132                         return (0);
 133                 val |= (parts[0] << 24) | (parts[1] << 16);
 134                 break;
 135
 136         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
 137                 if (val > 0xff)
 138                         return (0);
 139                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 140                 break;
 141         }
 142         if (addr)
 143                 addr->s_addr = htonl(val);
 144         return (1);
 145 }
 146 #endif