net/FreeBSD/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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static const char sccsid[] = "@(#)inet_network.c        8.1 (Berkeley) 6/4/93";
  32
  33 /* the algorithms only can deal with ASCII, so we optimize for it */
  34 #define USE_ASCII
  35
  36 #endif /* LIBC_SCCS and not lint */
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD: src/lib/libc/inet/inet_network.c,v 1.5 2008/01/14 22:55:20 cperciva Exp $");
  39
  40 #include "port_before.h"
  41
  42 #include <sys/types.h>
  43 #include <netinet/in.h>
  44 #include <arpa/inet.h>
  45 #include <ctype.h>
  46
  47 #include "port_after.h"
  48
  49 /*%
  50  * Internet network address interpretation routine.
  51  * The library routines call this routine to interpret
  52  * network numbers.
  53  */
  54 in_addr_t
  55 inet_network(cp)
  56         const char *cp;
  57 {
  58         in_addr_t val, base, n;
  59         char c;
  60         in_addr_t parts[4], *pp = parts;
  61         int i, digit;
  62
  63 again:
  64         val = 0; base = 10; digit = 0;
  65         if (*cp == '0')
  66                 digit = 1, base = 8, cp++;
  67         if (*cp == 'x' || *cp == 'X')
  68                 base = 16, cp++;
  69         while ((c = *cp) != 0) {
  70                 if (isdigit((unsigned char)c)) {
  71                         if (base == 8U && (c == '8' || c == '9'))
  72                                 return (INADDR_NONE);
  73                         val = (val * base) + (c - '0');
  74                         cp++;
  75                         digit = 1;
  76                         continue;
  77                 }
  78                 if (base == 16U && isxdigit((unsigned char)c)) {
  79                         val = (val << 4) +
  80                               (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
  81                         cp++;
  82                         digit = 1;
  83                         continue;
  84                 }
  85                 break;
  86         }
  87         if (!digit)
  88                 return (INADDR_NONE);
  89         if (pp >= parts + 4 || val > 0xffU)
  90                 return (INADDR_NONE);
  91         if (*cp == '.') {
  92                 *pp++ = val, cp++;
  93                 goto again;
  94         }
  95         if (*cp && !isspace(*cp&0xff))
  96                 return (INADDR_NONE);
  97         *pp++ = val;
  98         n = pp - parts;
  99         if (n > 4U)
 100                 return (INADDR_NONE);
 101         for (val = 0, i = 0; i < n; i++) {
 102                 val <<= 8;
 103                 val |= parts[i] & 0xff;
 104         }
 105         return (val);
 106 }
 107
 108 /*
 109  * Weak aliases for applications that use certain private entry points,
 110  * and fail to include <arpa/inet.h>.
 111  */
 112 #undef inet_network
 113 __weak_reference(__inet_network, inet_network);
 114
 115 /*! \file */