usr/src/lib/libc/port/inet/inet_network.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2001 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39
  40
  41 #include <sys/types.h>
  42 #include <ctype.h>
  43 #include <netinet/in.h>
  44
  45 /*
  46  * Internet network address interpretation routine.
  47  * The library routines call this routine to interpret
  48  * network numbers.
  49  */
  50 in_addr_t
  51 inet_network(const char *cp)
  52 {
  53         in_addr_t val;
  54         int base;
  55         ptrdiff_t n;
  56         char c;
  57         in_addr_t parts[4], *pp = parts;
  58         int i;
  59
  60 again:
  61         val = 0; base = 10;
  62         if (*cp == '0') {
  63                 if (*++cp == 'x' || *cp == 'X')
  64                         base = 16, cp++;
  65                 else
  66                         base = 8;
  67         }
  68         while ((c = *cp) != '\0') {
  69                 if (isdigit(c)) {
  70                         if ((c - '0') >= base)
  71                                 break;
  72                         val = (val * base) + (c - '0');
  73                         cp++;
  74                         continue;
  75                 }
  76                 if (base == 16 && isxdigit(c)) {
  77                         val = (val << 4) + (c + 10 - (islower(c) ? 'a' : 'A'));
  78                         cp++;
  79                         continue;
  80                 }
  81                 break;
  82         }
  83         if (pp >= parts + 4 || val > 0xff)
  84                 return ((in_addr_t)-1);
  85         *pp++ = val;
  86         if (*cp == '.') {
  87                 cp++;
  88                 goto again;
  89         }
  90         if (*cp != '\0' && !isspace(*cp))
  91                 return ((in_addr_t)-1);
  92         n = pp - parts;
  93         for (val = 0, i = 0; i < n; i++) {
  94                 val <<= 8;
  95                 val |= parts[i];
  96         }
  97         return (val);
  98 }