source: trunk/minix/lib/ip/ether_line.c@ 9

/*
**  ETHER_LINE
**
**      This routine parses the array pointed to by "line" (which should be
**      from a file in the format of /etc/ethers) and returns in "eaddr" the
**      ethernet address at the start of the line and the corresponding host
**      name in "hostname".  It assumes either tabs or spaces separate the
**      two.  The buffer pointed to by "hostname" must be big enough to hold
**      the host name plus a NULL byte.
**      The function returns 0 on success and 1 on failure.
**      Arguments are assumed sensible.  Null pointers will probably cause
**      exceptions.
**      Author: Gregory J. Sharp, July 1990
**      Adapted to MINIX: Philip Homburg, May 1992
*/

#include <sys/types.h>
#include <ctype.h>
#include <stdlib.h>
#include <net/gen/ether.h>
#include <net/gen/if_ether.h>

int
ether_line(line, eaddr, hostname)
char *                  line;
struct ether_addr *     eaddr;
char *                  hostname;
{
    register int i;
    register unsigned long val;

/* skip leading white space */
    while (*line != '\n' && (*line == ' ' || *line == '\t'))
        line++;

/* read the ethernet address */
    for (i = 0; i < 5; i++)
    {
        val = (unsigned long) strtol(line, &line, 16);
        if (val > 255 || *line++ != ':')
            return 1;
        eaddr->ea_addr[i] = val & 0xff;
    }
    val = (unsigned long) strtol(line, &line, 16);
    if (val > 255 || (*line != ' ' && *line != '\t'))
        return 1;
    eaddr->ea_addr[i] = val & 0xff;

/* skip leading white space */
    while (*line != '\n' && (*line == ' ' || *line == '\t'))
        line++;

/* read in the hostname */
    while (!isspace(*line))
        *hostname++ = *line++;
    *hostname = '\0';
    return 0;
}