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