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Annotation of 43BSDReno/lib/libc/net/iso_addr.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 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[] = "@(#)iso_addr.c 5.3 (Berkeley) 6/1/90";
        !            22: #endif /* LIBC_SCCS and not lint */
        !            23: 
        !            24: #include <sys/types.h>
        !            25: #include <netiso/iso.h>
        !            26: /* States*/
        !            27: #define VIRGIN 0
        !            28: #define GOTONE 1
        !            29: #define GOTTWO 2
        !            30: /* Inputs */
        !            31: #define        DIGIT   (4*0)
        !            32: #define        END     (4*1)
        !            33: #define DELIM  (4*2)
        !            34: 
        !            35: struct iso_addr *
        !            36: iso_addr(addr)
        !            37: register char *addr;
        !            38: {
        !            39:        static struct iso_addr out_addr;
        !            40:        register char *cp = out_addr.isoa_genaddr;
        !            41:        char *cplim = cp + sizeof(out_addr.isoa_genaddr);
        !            42:        register int byte = 0, state = VIRGIN, new;
        !            43: 
        !            44:        bzero((char *)&out_addr, sizeof(out_addr));
        !            45:        do {
        !            46:                if ((*addr >= '0') && (*addr <= '9')) {
        !            47:                        new = *addr - '0';
        !            48:                } else if ((*addr >= 'a') && (*addr <= 'f')) {
        !            49:                        new = *addr - 'a' + 10;
        !            50:                } else if ((*addr >= 'A') && (*addr <= 'F')) {
        !            51:                        new = *addr - 'A' + 10;
        !            52:                } else if (*addr == 0) 
        !            53:                        state |= END;
        !            54:                else
        !            55:                        state |= DELIM;
        !            56:                addr++;
        !            57:                switch (state /* | INPUT */) {
        !            58:                case GOTTWO | DIGIT:
        !            59:                        *cp++ = byte; /*FALLTHROUGH*/
        !            60:                case VIRGIN | DIGIT:
        !            61:                        state = GOTONE; byte = new; continue;
        !            62:                case GOTONE | DIGIT:
        !            63:                        state = GOTTWO; byte = new + (byte << 4); continue;
        !            64:                default: /* | DELIM */
        !            65:                        state = VIRGIN; *cp++ = byte; byte = 0; continue;
        !            66:                case GOTONE | END:
        !            67:                case GOTTWO | END:
        !            68:                        *cp++ = byte; /* FALLTHROUGH */
        !            69:                case VIRGIN | END:
        !            70:                        break;
        !            71:                }
        !            72:                break;
        !            73:        } while (cp < cplim); 
        !            74:        out_addr.isoa_len = cp - out_addr.isoa_genaddr;
        !            75:        return (&out_addr);
        !            76: }
        !            77: static char hexlist[] = "0123456789abcdef";
        !            78: 
        !            79: char *
        !            80: iso_ntoa(isoa)
        !            81: struct iso_addr *isoa;
        !            82: {
        !            83:        static char obuf[64];
        !            84:        register char *out = obuf; 
        !            85:        register int i;
        !            86:        register u_char *in = (u_char *)isoa->isoa_genaddr;
        !            87:        u_char *inlim = in + isoa->isoa_len;
        !            88: 
        !            89:        out[1] = 0;
        !            90:        while (in < inlim) {
        !            91:                i = *in++;
        !            92:                *out++ = '.';
        !            93:                if (i > 0xf) {
        !            94:                        out[1] = hexlist[i & 0xf];
        !            95:                        i >>= 4;
        !            96:                        out[0] = hexlist[i];
        !            97:                        out += 2;
        !            98:                } else
        !            99:                        *out++ = hexlist[i];
        !           100:        }
        !           101:        *out = 0;
        !           102:        return(obuf + 1);
        !           103: }

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