inet_addr.c

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    1 /*      $NetBSD: inet_addr.c,v 1.6 2001/04/18 15:42:28 thorpej Exp $    */
    2 
    3 /* Copyright (c) 1996 by Internet Software Consortium.
    4  *
    5  * Permission to use, copy, modify, and distribute this software for any
    6  * purpose with or without fee is hereby granted, provided that the above
    7  * copyright notice and this permission notice appear in all copies.
    8  *
    9  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
   10  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
   11  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
   12  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
   13  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
   14  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
   15  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
   16  * SOFTWARE.
   17  */
   18 
   19 /*
   20  * Derived from:
   21  * src/lib/libc/net/inet_pton.c
   22  */
   23 
   24 #include <sys/types.h>
   25 
   26 #if !defined(_KERNEL) && !defined(_STANDALONE)
   27 #include <sys/socket.h>
   28 #include <netinet/in.h>
   29 #include <arpa/inet.h>
   30 #include <ctype.h>
   31 #else
   32 #include <lib/libkern/libkern.h>
   33 #endif
   34 
   35 /*
   36  * Ascii internet address interpretation routine.
   37  * The value returned is in network order.
   38  */
   39 #if !defined(_KERNEL) && !defined(_STANDALONE)
   40 u_long /* XXX to comply with the prototype in <arpa/inet.h> */
   41 #else
   42 u_int32_t
   43 #endif
   44 inet_addr(src)
   45         const char *src;
   46 {
   47         u_int32_t val;
   48         int base, n;
   49         unsigned char c;
   50         u_int parts[4];
   51         u_int *pp = parts;
   52 
   53         c = *src;
   54         for (;;) {
   55                 /*
   56                  * Collect number up to ``.''.
   57                  * Values are specified as for C:
   58                  * 0x=hex, 0=octal, isdigit=decimal.
   59                  */
   60                 if (!isdigit(c))
   61                         return (0);
   62                 val = 0; base = 10;
   63                 if (c == '') {
   64                         c = *++src;
   65                         if (toupper(c) == 'X')
   66                                 base = 16, c = *++src;
   67                         else
   68                                 base = 8;
   69                 }
   70                 for (;;) {
   71                         if (isdigit(c)) {
   72                                 val = (val * base) + (c - '');
   73                                 c = *++src;
   74                         } else if (base == 16 && isxdigit(toupper(c))) {
   75                                 val = (val << 4) |
   76                                         (toupper(c) + 10 - 'A');
   77                                 c = *++src;
   78                         } else
   79                         break;
   80                 }
   81                 if (c == '.') {
   82                         /*
   83                          * Internet format:
   84                          *      a.b.c.d
   85                          *      a.b.c   (with c treated as 16 bits)
   86                          *      a.b     (with b treated as 24 bits)
   87                          */
   88                         if (pp >= parts + 3)
   89                                 return (0);
   90                         *pp++ = val;
   91                         c = *++src;
   92                 } else
   93                         break;
   94         }
   95         /*
   96          * Check for trailing characters.
   97          */
   98         if (c != '\0' && !isspace(c))
   99                 return (0);
  100         /*
  101          * Concoct the address according to
  102          * the number of parts specified.
  103          */
  104         n = pp - parts + 1;
  105         switch (n) {
  106 
  107         case 0:
  108                 return (0);             /* initial nondigit */
  109 
  110         case 1:                         /* a -- 32 bits */
  111                 break;
  112 
  113         case 2:                         /* a.b -- 8.24 bits */
  114                 if (val > 0xffffff)
  115                         return (0);
  116                 val |= parts[0] << 24;
  117                 break;
  118 
  119         case 3:                         /* a.b.c -- 8.8.16 bits */
  120                 if (val > 0xffff)
  121                         return (0);
  122                 val |= (parts[0] << 24) | (parts[1] << 16);
  123                 break;
  124 
  125         case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
  126                 if (val > 0xff)
  127                         return (0);
  128                 val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
  129                 break;
  130         }
  131 
  132         val = htonl(val);
  133         return (val);
  134 }

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FreeBSD/Linux Kernel Cross Reference sys/lib/libkern/inet_addr.c

FreeBSD/Linux Kernel Cross Reference
sys/lib/libkern/inet_addr.c