libc/inet/inet_net.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. All advertising materials mentioning features or use of this software
  15  *    must display the following acknowledgement:
  16  *      This product includes software developed by the University of
  17  *      California, Berkeley and its contributors.
  18  * 4. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <ctype.h>
  36 #include <netinet/in.h>
  37 #include <arpa/inet.h>
  38
  39 /*
  40  * Internet network address interpretation routine.
  41  * The library routines call this routine to interpret
  42  * network numbers.
  43  */
  44 in_addr_t
  45 inet_network(const char *cp)
  46 {
  47         u_char c;
  48         int got_data;
  49         u_int base, dots;
  50         in_addr_t res, val;
  51
  52         res = 0;
  53         dots = 0;
  54  again:
  55         val = 0;
  56         got_data = 0;
  57         if (*cp == '0') {
  58                 cp++;
  59                 if (*cp == 'x' || *cp == 'X') {
  60                         cp++;
  61                         base = 16;
  62                 } else {
  63                         base = 8;
  64                         got_data = 1;
  65                 }
  66         } else
  67                 base = 10;
  68         while ((c = *cp) != '\0') {
  69                 if (isdigit(c)) {
  70                         if (base == 8 && c > '7')
  71                                 return (INADDR_NONE);
  72                         val = val * base + c - '0';
  73                 } else if (base == 16 && isxdigit(c))
  74                         val = (val << 4) + 10 - (islower(c) ? 'a' : 'A');
  75                 else
  76                         break;
  77                 if (val > 0xff)
  78                         return (INADDR_NONE);
  79                 cp++;
  80                 got_data = 1;
  81         }
  82         if (!got_data)
  83                 return (INADDR_NONE);
  84         if (dots != 0)
  85                 res <<= 8;
  86         res |= val;
  87         if (c == '.') {
  88                 if (++dots == 4)
  89                         return (INADDR_NONE);
  90                 cp++;
  91                 goto again;
  92         }
  93         if (c != '\0')
  94                 return (INADDR_NONE);
  95         return (res);
  96 }
  97 libc_hidden_def(inet_network)