BSD 4_3_Reno release

[unix-history] / usr / src / lib / libc / net / linkaddr.c

/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that: (1) source distributions retain this entire copyright
* notice and comment, and (2) distributions including binaries display
* the following acknowledgement:  ``This product includes software
* developed by the University of California, Berkeley and its contributors''
* in the documentation or other materials provided with the distribution
* and in all advertising materials mentioning features or use of this
* software. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)linkaddr.c  5.1 (Berkeley) 6/1/90";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/socket.h>
#include <net/if_dl.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)

link_addr(addr, sdl)
register 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;
}

static char hexlist[] = "0123456789abcdef";

char *
link_ntoa(sdl)
register struct sockaddr_dl *sdl;
{
       static char obuf[64];
       register char *out = obuf; 
       register int i;
       register u_char *in = (u_char *)LLADDR(sdl);
       u_char *inlim = in + sdl->sdl_nlen;
       int firsttime = 1;

       if (sdl->sdl_nlen) {
               bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
               out += sdl->sdl_nlen;
               *out++ = ':';
       }
       while (in < inlim) {
               if (firsttime) firsttime = 0; else *out++ = '.';
               i = *in++;
               if (i > 0xf) {
                       out[1] = hexlist[i & 0xf];
                       i >>= 4;
                       out[0] = hexlist[i];
                       out += 2;
               } else
                       *out++ = hexlist[i];
       }
       *out = 0;
       return(obuf);
}