1 /*-
2 * Copyright (c) 1987, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 * -
7 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
8 *
9 * Permission to use, copy, modify, and distribute this software for any
10 * purpose with or without fee is hereby granted, provided that the above
11 * copyright notice and this permission notice appear in all copies, and that
12 * the name of Digital Equipment Corporation not be used in advertising or
13 * publicity pertaining to distribution of the document or software without
14 * specific, written prior permission.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
17 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
19 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
20 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
21 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
22 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
23 * SOFTWARE.
24 * -
25 * --Copyright--
26 */
27
28 #if defined(LIBC_SCCS) && !defined(lint)
29 static char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 06/04/93";
30 static char rcsid[] = "$Id: herror.c,v 4.9.1.1 1993/05/02 23:14:35 vixie Rel $";
31 #endif /* LIBC_SCCS and not lint */
32
33 #include <sys/types.h>
34 #include <sys/uio.h>
35 #include <netdb.h>
36 #include <unistd.h>
37 #include <string.h>
38
39 char *h_errlist[] = {
40 "Error 0",
41 "Unknown host", /* 1 HOST_NOT_FOUND */
42 "Host name lookup failure", /* 2 TRY_AGAIN */
43 "Unknown server error", /* 3 NO_RECOVERY */
44 "No address associated with name", /* 4 NO_ADDRESS */
45 };
46 int h_nerr = { sizeof(h_errlist)/sizeof(h_errlist[0]) };
47
48 extern int h_errno;
49
50 /*
51 * herror --
52 * print the error indicated by the h_errno value.
53 */
54 void
herror(s)55 herror(s)
56 const char *s;
57 {
58 struct iovec iov[4];
59 register struct iovec *v = iov;
60
61 if (s && *s) {
62 v->iov_base = (char *)s;
63 v->iov_len = strlen(s);
64 v++;
65 v->iov_base = ": ";
66 v->iov_len = 2;
67 v++;
68 }
69 v->iov_base = (u_int)h_errno < h_nerr ?
70 h_errlist[h_errno] : "Unknown error";
71 v->iov_len = strlen(v->iov_base);
72 v++;
73 v->iov_base = "\n";
74 v->iov_len = 1;
75 writev(STDERR_FILENO, iov, (v - iov) + 1);
76 }
77
78 char *
hstrerror(err)79 hstrerror(err)
80 int err;
81 {
82 return (u_int)err < h_nerr ? h_errlist[err] : "Unknown resolver error";
83 }
84