usr/src/lib/libresolv2/common/inet/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 const char sccsid[] = "@(#)inet_network.c        8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37
  38 #include "port_before.h"
  39
  40 #include <sys/types.h>
  41 #include <netinet/in.h>
  42 #include <arpa/inet.h>
  43 #include <ctype.h>
  44
  45 #include "port_after.h"
  46
  47 /*%
  48  * Internet network address interpretation routine.
  49  * The library routines call this routine to interpret
  50  * network numbers.
  51  */
  52 u_long
  53 inet_network(cp)
  54         register const char *cp;
  55 {
  56         register u_long val, base, n, i;
  57         register char c;
  58         u_long parts[4], *pp = parts;
  59         int digit;
  60
  61 again:
  62         val = 0; base = 10; digit = 0;
  63         if (*cp == '0')
  64                 digit = 1, base = 8, cp++;
  65         if (*cp == 'x' || *cp == 'X')
  66                 base = 16, cp++;
  67         while ((c = *cp) != 0) {
  68                 if (isdigit((unsigned char)c)) {
  69                         if (base == 8U && (c == '8' || c == '9'))
  70                                 return (INADDR_NONE);
  71                         val = (val * base) + (c - '0');
  72                         cp++;
  73                         digit = 1;
  74                         continue;
  75                 }
  76                 if (base == 16U && isxdigit((unsigned char)c)) {
  77                         val = (val << 4) +
  78                               (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
  79                         cp++;
  80                         digit = 1;
  81                         continue;
  82                 }
  83                 break;
  84         }
  85         if (!digit)
  86                 return (INADDR_NONE);
  87         if (pp >= parts + 4 || val > 0xffU)
  88                 return (INADDR_NONE);
  89         if (*cp == '.') {
  90                 *pp++ = val, cp++;
  91                 goto again;
  92         }
  93         if (*cp && !isspace(*cp&0xff))
  94                 return (INADDR_NONE);
  95         *pp++ = val;
  96         n = pp - parts;
  97         if (n > 4U)
  98                 return (INADDR_NONE);
  99         for (val = 0, i = 0; i < n; i++) {
 100                 val <<= 8;
 101                 val |= parts[i] & 0xff;
 102         }
 103         return (val);
 104 }
 105
 106 /*! \file */