1/*	$NetBSD: ns_ntoa.c,v 1.12 2003/09/23 03:19:28 itojun Exp $	*/
2
3/*
4 * Copyright (c) 1986, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char sccsid[] = "@(#)ns_ntoa.c	8.1 (Berkeley) 6/4/93";
36#else
37__RCSID("$NetBSD: ns_ntoa.c,v 1.12 2003/09/23 03:19:28 itojun Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include <sys/param.h>
42#include <compat/include/ns.h>
43
44#include <assert.h>
45#include <stdio.h>
46
47static char *spectHex __P((char *));
48
49char *
50ns_ntoa(addr)
51	struct ns_addr addr;
52{
53	static char obuf[40];
54	union { union ns_net net_e; u_int32_t long_e; } net;
55	u_int16_t port = htons(addr.x_port);
56	char *cp;
57	char *cp2;
58	u_int8_t *up = addr.x_host.c_host;
59	u_int8_t *uplim = up + 6;
60
61	net.net_e = addr.x_net;
62	sprintf(obuf, "%x", ntohl(net.long_e));
63	cp = spectHex(obuf);
64	cp2 = cp + 1;
65	while (up < uplim && *up==0)
66		up++;
67	if (up == uplim) {
68		if (port) {
69			sprintf(cp, ".0");
70			cp += 2;
71		}
72	} else {
73		sprintf(cp, ".%x", *up++);
74		while (up < uplim) {
75			while (*cp) cp++;
76			sprintf(cp, "%02x", *up++);
77		}
78		cp = spectHex(cp2);
79	}
80	if (port) {
81		sprintf(cp, ".%x", port);
82		spectHex(cp + 1);
83	}
84	return (obuf);
85}
86
87static char *
88spectHex(p0)
89	char *p0;
90{
91	int ok = 0;
92	int nonzero = 0;
93	char *p = p0;
94
95	_DIAGASSERT(p0 != NULL);
96
97	for (; *p; p++)
98		switch (*p) {
99		case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
100			*p += ('A' - 'a');
101			/* FALLTHROUGH */
102		case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
103			ok = 1;
104			/* FALLTHROUGH */
105		case '1': case '2': case '3': case '4': case '5':
106		case '6': case '7': case '8': case '9':
107			nonzero = 1;
108		}
109	if (nonzero && !ok) { *p++ = 'H'; *p = 0; }
110	return (p);
111}
112