StdLib/BsdSocketLib/ns_ntoa.c

/*
 * Copyright (c) 1986, 1993
 *  The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *  This product includes software developed by the University of
 *  California, Berkeley and its contributors.
 * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ns_ntoa.c   8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>
#include <netns/ns.h>
#include <stdio.h>

static char *spectHex();

char *
ns_ntoa(
    struct ns_addr addr
    )
{
    static char obuf[40];
    union { union ns_net net_e; u_long long_e; } net;
    u_short port = htons(addr.x_port);
    register char *cp;
    char *cp2;
    register u_char *up = addr.x_host.c_host;
    u_char *uplim = up + 6;

    net.net_e = addr.x_net;
    sprintf(obuf, "%lx", (u_long)ntohl(net.long_e));
    cp = spectHex(obuf);
    cp2 = cp + 1;
    while (*up==0 && up < uplim) up++;
    if (up == uplim) {
        if (port) {
            sprintf(cp, ".0");
            cp += 2;
        }
    } else {
        sprintf(cp, ".%x", *up++);
        while (up < uplim) {
            while (*cp) cp++;
            sprintf(cp, "%02x", *up++);
        }
        cp = spectHex(cp2);
    }
    if (port) {
        sprintf(cp, ".%x", port);
        spectHex(cp + 1);
    }
    return (obuf);
}

static char *
spectHex(
    char *p0
    )
{
    int ok = 0;
    int nonzero = 0;
    register char *p = p0;
    for (; *p; p++) switch (*p) {

    case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
        *p += ('A' - 'a');
        /* fall into . . . */
    case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
        ok = 1;
    case '1': case '2': case '3': case '4': case '5':
    case '6': case '7': case '8': case '9':
        nonzero = 1;
    }
    if (nonzero && !ok) { *p++ = 'H'; *p = 0; }
    return (p);
}