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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1986 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[] = "@(#)ns_ntoa.c  6.5 (Berkeley) 6/1/90";
        !            22: #endif /* LIBC_SCCS and not lint */
        !            23: 
        !            24: #include <sys/types.h>
        !            25: #include <netns/ns.h>
        !            26: 
        !            27: char *
        !            28: ns_ntoa(addr)
        !            29: struct ns_addr addr;
        !            30: {
        !            31:        static char obuf[40];
        !            32:        char *spectHex();
        !            33:        union { union ns_net net_e; u_long long_e; } net;
        !            34:        u_short port = htons(addr.x_port);
        !            35:        register char *cp;
        !            36:        char *cp2;
        !            37:        register u_char *up = addr.x_host.c_host;
        !            38:        u_char *uplim = up + 6;
        !            39: 
        !            40:        net.net_e = addr.x_net;
        !            41:        sprintf(obuf, "%lx", ntohl(net.long_e));
        !            42:        cp = spectHex(obuf);
        !            43:        cp2 = cp + 1;
        !            44:        while (*up==0 && up < uplim) up++;
        !            45:        if (up == uplim) {
        !            46:                if (port) {
        !            47:                        sprintf(cp, ".0");
        !            48:                        cp += 2;
        !            49:                }
        !            50:        } else {
        !            51:                sprintf(cp, ".%x", *up++);
        !            52:                while (up < uplim) {
        !            53:                        while (*cp) cp++;
        !            54:                        sprintf(cp, "%02x", *up++);
        !            55:                }
        !            56:                cp = spectHex(cp2);
        !            57:        }
        !            58:        if (port) {
        !            59:                sprintf(cp, ".%x", port);
        !            60:                spectHex(cp + 1);
        !            61:        }
        !            62:        return (obuf);
        !            63: }
        !            64: 
        !            65: static char *
        !            66: spectHex(p0)
        !            67: char *p0;
        !            68: {
        !            69:        int ok = 0;
        !            70:        int nonzero = 0;
        !            71:        register char *p = p0;
        !            72:        for (; *p; p++) switch (*p) {
        !            73: 
        !            74:        case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
        !            75:                *p += ('A' - 'a');
        !            76:                /* fall into . . . */
        !            77:        case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
        !            78:                ok = 1;
        !            79:        case '1': case '2': case '3': case '4': case '5':
        !            80:        case '6': case '7': case '8': case '9':
        !            81:                nonzero = 1;
        !            82:        }
        !            83:        if (nonzero && !ok) { *p++ = 'H'; *p = 0; }
        !            84:        return (p);
        !            85: }

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