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- RCS_ID_C = "$Id: linkaddr.c,v 4.1 1994/09/29 23:09:02 jraja Exp $";
- /*
- * linkaddr.c - link level address parsing
- *
- * Copyright © 1994 AmiTCP/IP Group,
- * Network Solutions Development Inc.
- * All rights reserved.
- *
- * Copyright © 1991 Regents of the University of California.
- */
-
- #if 0
- static char sccsid[] = "@(#)linkaddr.c 5.2 (Berkeley) 2/24/91";
- #endif
-
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <net/if.h>
- #include <net/if_dl.h>
- #include <string.h>
-
- /* States*/
- #define NAMING 0
- #define GOTONE 1
- #define GOTTWO 2
- #define RESET 3
- /* Inputs */
- #define DIGIT (4*0)
- #define END (4*1)
- #define DELIM (4*2)
- #define LETTER (4*3)
-
- void
- link_addr(addr, sdl)
- register const char *addr;
- register struct sockaddr_dl *sdl;
- {
- register char *cp = sdl->sdl_data;
- char *cplim = sdl->sdl_len + (char *)sdl;
- register int byte = 0, state = NAMING, new;
-
- bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
- sdl->sdl_family = AF_LINK;
- do {
- state &= ~LETTER;
- if ((*addr >= '0') && (*addr <= '9')) {
- new = *addr - '0';
- } else if ((*addr >= 'a') && (*addr <= 'f')) {
- new = *addr - 'a' + 10;
- } else if ((*addr >= 'A') && (*addr <= 'F')) {
- new = *addr - 'A' + 10;
- } else if (*addr == 0) {
- state |= END;
- } else if (state == NAMING &&
- (((*addr >= 'A') && (*addr <= 'Z')) ||
- ((*addr >= 'a') && (*addr <= 'z'))))
- state |= LETTER;
- else
- state |= DELIM;
- addr++;
- switch (state /* | INPUT */) {
- case NAMING | DIGIT:
- case NAMING | LETTER:
- *cp++ = addr[-1]; continue;
- case NAMING | DELIM:
- state = RESET; sdl->sdl_nlen = cp - sdl->sdl_data; continue;
- case GOTTWO | DIGIT:
- *cp++ = byte; /*FALLTHROUGH*/
- case RESET | DIGIT:
- state = GOTONE; byte = new; continue;
- case GOTONE | DIGIT:
- state = GOTTWO; byte = new + (byte << 4); continue;
- default: /* | DELIM */
- state = RESET; *cp++ = byte; byte = 0; continue;
- case GOTONE | END:
- case GOTTWO | END:
- *cp++ = byte; /* FALLTHROUGH */
- case RESET | END:
- break;
- }
- break;
- } while (cp < cplim);
- sdl->sdl_alen = cp - LLADDR(sdl);
- new = cp - (char *)sdl;
- if (new > sizeof(*sdl))
- sdl->sdl_len = new;
- return;
- }
-
-