lib/ip/ether_line.c

   1 /*
   2 **  ETHER_LINE
   3 **
   4 **      This routine parses the array pointed to by "line" (which should be
   5 **      from a file in the format of /etc/ethers) and returns in "eaddr" the
   6 **      ethernet address at the start of the line and the corresponding host
   7 **      name in "hostname".  It assumes either tabs or spaces separate the
   8 **      two.  The buffer pointed to by "hostname" must be big enough to hold
   9 **      the host name plus a NULL byte.
  10 **      The function returns 0 on success and 1 on failure.
  11 **      Arguments are assumed sensible.  Null pointers will probably cause
  12 **      exceptions.
  13 **      Author: Gregory J. Sharp, July 1990
  14 **      Adapted to MINIX: Philip Homburg, May 1992
  15 */
  16
  17 #include <sys/types.h>
  18 #include <ctype.h>
  19 #include <stdlib.h>
  20 #include <net/gen/ether.h>
  21 #include <net/gen/if_ether.h>
  22
  23 int
  24 ether_line(line, eaddr, hostname)
  25 char *                  line;
  26 struct ether_addr *     eaddr;
  27 char *                  hostname;
  28 {
  29     register int i;
  30     register unsigned long val;
  31
  32 /* skip leading white space */
  33     while (*line != '\n' && (*line == ' ' || *line == '\t'))
  34         line++;
  35
  36 /* read the ethernet address */
  37     for (i = 0; i < 5; i++)
  38     {
  39         val = (unsigned long) strtol(line, &line, 16);
  40         if (val > 255 || *line++ != ':')
  41             return 1;
  42         eaddr->ea_addr[i] = val & 0xff;
  43     }
  44     val = (unsigned long) strtol(line, &line, 16);
  45     if (val > 255 || (*line != ' ' && *line != '\t'))
  46         return 1;
  47     eaddr->ea_addr[i] = val & 0xff;
  48
  49 /* skip leading white space */
  50     while (*line != '\n' && (*line == ' ' || *line == '\t'))
  51         line++;
  52
  53 /* read in the hostname */
  54     while (!isspace(*line))
  55         *hostname++ = *line++;
  56     *hostname = '\0';
  57     return 0;
  58 }