contrib/bind-9.5.2/lib/bind/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 in_addr_t
  53 inet_network(cp)
  54         const char *cp;
  55 {
  56         in_addr_t val, base, n;
  57         char c;
  58         in_addr_t parts[4], *pp = parts;
  59         int i, digit;
  60 again:
  61         val = 0; base = 10; digit = 0;
  62         if (*cp == '0')
  63                 digit = 1, base = 8, cp++;
  64         if (*cp == 'x' || *cp == 'X')
  65                 base = 16, cp++;
  66         while ((c = *cp) != 0) {
  67                 if (isdigit((unsigned char)c)) {
  68                         if (base == 8U && (c == '8' || c == '9'))
  69                                 return (INADDR_NONE);
  70                         val = (val * base) + (c - '0');
  71                         cp++;
  72                         digit = 1;
  73                         continue;
  74                 }
  75                 if (base == 16U && isxdigit((unsigned char)c)) {
  76                         val = (val << 4) +
  77                               (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
  78                         cp++;
  79                         digit = 1;
  80                         continue;
  81                 }
  82                 break;
  83         }
  84         if (!digit)
  85                 return (INADDR_NONE);
  86         if (pp >= parts + 4 || val > 0xffU)
  87                 return (INADDR_NONE);
  88         if (*cp == '.') {
  89                 *pp++ = val, cp++;
  90                 goto again;
  91         }
  92         if (*cp && !isspace(*cp&0xff))
  93                 return (INADDR_NONE);
  94         *pp++ = val;
  95         n = pp - parts;
  96         if (n > 4U)
  97                 return (INADDR_NONE);
  98         for (val = 0, i = 0; i < n; i++) {
  99                 val <<= 8;
 100                 val |= parts[i] & 0xff;
 101         }
 102         return (val);
 103 }
 104
 105 #ifdef _LIBC
 106 /*
 107  * Weak aliases for applications that use certain private entry points,
 108  * and fail to include <arpa/inet.h>.
 109  */
 110 #undef inet_network
 111 __weak_reference(__inet_network, inet_network);
 112 #endif
 113 /*! \file */