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Annotation of 43BSDReno/lib/libc/net/linkaddr.c, revision 1.1.1.1

1.1       root        1: /*-
                      2:  * Copyright (c) 1990 The Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #if defined(LIBC_SCCS) && !defined(lint)
                     21: static char sccsid[] = "@(#)linkaddr.c 5.1 (Berkeley) 6/1/90";
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: #include <sys/types.h>
                     25: #include <sys/socket.h>
                     26: #include <net/if_dl.h>
                     27: 
                     28: /* States*/
                     29: #define NAMING 0
                     30: #define GOTONE 1
                     31: #define GOTTWO 2
                     32: #define RESET  3
                     33: /* Inputs */
                     34: #define        DIGIT   (4*0)
                     35: #define        END     (4*1)
                     36: #define DELIM  (4*2)
                     37: #define LETTER (4*3)
                     38: 
                     39: link_addr(addr, sdl)
                     40: register char *addr;
                     41: register struct sockaddr_dl *sdl;
                     42: {
                     43:        register char *cp = sdl->sdl_data;
                     44:        char *cplim = sdl->sdl_len + (char *)sdl;
                     45:        register int byte = 0, state = NAMING, new;
                     46: 
                     47:        bzero((char *)&sdl->sdl_family, sdl->sdl_len - 1);
                     48:        sdl->sdl_family = AF_LINK;
                     49:        do {
                     50:                state &= ~LETTER;
                     51:                if ((*addr >= '0') && (*addr <= '9')) {
                     52:                        new = *addr - '0';
                     53:                } else if ((*addr >= 'a') && (*addr <= 'f')) {
                     54:                        new = *addr - 'a' + 10;
                     55:                } else if ((*addr >= 'A') && (*addr <= 'F')) {
                     56:                        new = *addr - 'A' + 10;
                     57:                } else if (*addr == 0) {
                     58:                        state |= END;
                     59:                } else if (state == NAMING &&
                     60:                           (((*addr >= 'A') && (*addr <= 'Z')) ||
                     61:                           ((*addr >= 'a') && (*addr <= 'z'))))
                     62:                        state |= LETTER;
                     63:                else
                     64:                        state |= DELIM;
                     65:                addr++;
                     66:                switch (state /* | INPUT */) {
                     67:                case NAMING | DIGIT:
                     68:                case NAMING | LETTER:
                     69:                        *cp++ = addr[-1]; continue;
                     70:                case NAMING | DELIM:
                     71:                        state = RESET; sdl->sdl_nlen = cp - sdl->sdl_data; continue;
                     72:                case GOTTWO | DIGIT:
                     73:                        *cp++ = byte; /*FALLTHROUGH*/
                     74:                case RESET | DIGIT:
                     75:                        state = GOTONE; byte = new; continue;
                     76:                case GOTONE | DIGIT:
                     77:                        state = GOTTWO; byte = new + (byte << 4); continue;
                     78:                default: /* | DELIM */
                     79:                        state = RESET; *cp++ = byte; byte = 0; continue;
                     80:                case GOTONE | END:
                     81:                case GOTTWO | END:
                     82:                        *cp++ = byte; /* FALLTHROUGH */
                     83:                case RESET | END:
                     84:                        break;
                     85:                }
                     86:                break;
                     87:        } while (cp < cplim); 
                     88:        sdl->sdl_alen = cp - LLADDR(sdl);
                     89:        new = cp - (char *)sdl;
                     90:        if (new > sizeof(*sdl))
                     91:                sdl->sdl_len = new;
                     92:        return;
                     93: }
                     94: 
                     95: static char hexlist[] = "0123456789abcdef";
                     96: 
                     97: char *
                     98: link_ntoa(sdl)
                     99: register struct sockaddr_dl *sdl;
                    100: {
                    101:        static char obuf[64];
                    102:        register char *out = obuf; 
                    103:        register int i;
                    104:        register u_char *in = (u_char *)LLADDR(sdl);
                    105:        u_char *inlim = in + sdl->sdl_nlen;
                    106:        int firsttime = 1;
                    107: 
                    108:        if (sdl->sdl_nlen) {
                    109:                bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
                    110:                out += sdl->sdl_nlen;
                    111:                *out++ = ':';
                    112:        }
                    113:        while (in < inlim) {
                    114:                if (firsttime) firsttime = 0; else *out++ = '.';
                    115:                i = *in++;
                    116:                if (i > 0xf) {
                    117:                        out[1] = hexlist[i & 0xf];
                    118:                        i >>= 4;
                    119:                        out[0] = hexlist[i];
                    120:                        out += 2;
                    121:                } else
                    122:                        *out++ = hexlist[i];
                    123:        }
                    124:        *out = 0;
                    125:        return(obuf);
                    126: }

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