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 #pragma clang diagnostic push
  31 #pragma clang diagnostic ignored "-Wcomma"
  32
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 static const char sccsid[] = "@(#)inet_network.c        8.1 (Berkeley) 6/4/93";
  35
  36 /* the algorithms only can deal with ASCII, so we optimize for it */
  37 #define USE_ASCII
  38
  39 #endif /* LIBC_SCCS and not lint */
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD: src/lib/libc/inet/inet_network.c,v 1.5 2008/01/14 22:55:20 cperciva Exp $");
  42
  43 #include "port_before.h"
  44
  45 #include <sys/types.h>
  46 #include <netinet/in.h>
  47 #include <arpa/inet.h>
  48 #include <ctype.h>
  49
  50 #include "port_after.h"
  51
  52 /*%
  53  * Internet network address interpretation routine.
  54  * The library routines call this routine to interpret
  55  * network numbers.
  56  */
  57 in_addr_t
  58 inet_network(cp)
  59         const char *cp;
  60 {
  61         in_addr_t val, base, n;
  62         char c;
  63         in_addr_t parts[4], *pp = parts;
  64         int i, digit;
  65
  66 again:
  67         val = 0; base = 10; digit = 0;
  68         if (*cp == '0')
  69                 digit = 1, base = 8, cp++;
  70         if (*cp == 'x' || *cp == 'X')
  71                 base = 16, cp++;
  72         while ((c = *cp) != 0) {
  73                 if (isdigit((unsigned char)c)) {
  74                         if (base == 8U && (c == '8' || c == '9'))
  75                                 return (INADDR_NONE);
  76                         val = (val * base) + (c - '0');
  77                         cp++;
  78                         digit = 1;
  79                         continue;
  80                 }
  81                 if (base == 16U && isxdigit((unsigned char)c)) {
  82                         val = (val << 4) +
  83                               (c + 10 - (islower((unsigned char)c) ? 'a' : 'A'));
  84                         cp++;
  85                         digit = 1;
  86                         continue;
  87                 }
  88                 break;
  89         }
  90         if (!digit)
  91                 return (INADDR_NONE);
  92         if (pp >= parts + 4 || val > 0xffU)
  93                 return (INADDR_NONE);
  94         if (*cp == '.') {
  95                 *pp++ = val, cp++;
  96                 goto again;
  97         }
  98         if (*cp && !isspace(*cp&0xff))
  99                 return (INADDR_NONE);
 100         *pp++ = val;
 101         n = pp - parts;
 102         if (n > 4U)
 103                 return (INADDR_NONE);
 104         for (val = 0, i = 0; i < n; i++) {
 105                 val <<= 8;
 106                 val |= parts[i] & 0xff;
 107         }
 108         return (val);
 109 }
 110
 111 /*
 112  * Weak aliases for applications that use certain private entry points,
 113  * and fail to include <arpa/inet.h>.
 114  */
 115 #undef inet_network
 116 __weak_reference(__inet_network, inet_network);
 117
 118 #pragma clang diagnostic pop
 119 /*! \file */