1/*
2 * ++Copyright++ 1987, 1993
3 * -
4 * Copyright (c) 1987, 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 * 	This product includes software developed by the University of
18 * 	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 * -
35 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
36 *
37 * Permission to use, copy, modify, and distribute this software for any
38 * purpose with or without fee is hereby granted, provided that the above
39 * copyright notice and this permission notice appear in all copies, and that
40 * the name of Digital Equipment Corporation not be used in advertising or
41 * publicity pertaining to distribution of the document or software without
42 * specific, written prior permission.
43 *
44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
46 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
51 * SOFTWARE.
52 * -
53 * --Copyright--
54 */
55
56#if defined(LIBC_SCCS) && !defined(lint)
57static char sccsid[] = "@(#)herror.c	8.1 (Berkeley) 6/4/93";
58static char rcsid[] = "$Id: herror.c,v 1.4 2003/04/10 20:21:16 majka Exp $";
59#endif /* LIBC_SCCS and not lint */
60
61#include <sys/param.h>
62#include <sys/uio.h>
63#include <netdb.h>
64#include <string.h>
65#include <unistd.h>
66
67const char * const h_errlist[] = {
68	"Resolver Error 0 (no error)",
69	"Unknown host",				/* 1 HOST_NOT_FOUND */
70	"Host name lookup failure",		/* 2 TRY_AGAIN */
71	"Unknown server error",			/* 3 NO_RECOVERY */
72	"No address associated with name",	/* 4 NO_ADDRESS */
73};
74const int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
75
76int h_errno;
77
78/*
79 * herror --
80 *	print the error indicated by the h_errno value.
81 */
82void
83herror(const char *s)
84{
85	struct iovec iov[4];
86	register struct iovec *v = iov;
87
88	if (s && *s) {
89		v->iov_base = (char *)s;
90		v->iov_len = strlen(s);
91		v++;
92		v->iov_base = ": ";
93		v->iov_len = 2;
94		v++;
95	}
96	v->iov_base = (char *)hstrerror(h_errno);
97	v->iov_len = strlen(v->iov_base);
98	v++;
99	v->iov_base = "\n";
100	v->iov_len = 1;
101	writev(STDERR_FILENO, iov, (v - iov) + 1);
102}
103
104const char *
105hstrerror(int err)
106{
107	if (err < 0)
108		return ("Resolver internal error");
109	else if (err < h_nerr)
110		return ((char *)h_errlist[err]);
111	return ("Unknown resolver error");
112}
113