1 /*
2 * Copyright (c) 1987 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 #include <stdio.h>
21 #include <string.h>
22 #include <netdb.h>
23
24
25 static const char error_msg[] = "Resolver error";
26 static const char *const h_errlist[] = {
27 "Error 0",
28 "Unknown host", /* 1 HOST_NOT_FOUND */
29 "Host name lookup failure", /* 2 TRY_AGAIN */
30 "Unknown server error", /* 3 NO_RECOVERY */
31 "No address associated with name", /* 4 NO_ADDRESS */
32 };
33 static const int h_nerr = { sizeof(h_errlist)/sizeof(h_errlist[0]) };
34
35 /*
36 * herror -- print the error indicated by the h_errno value.
37 */
herror(const char * s)38 void herror(const char *s)
39 {
40 static const char colon_space[] = ": ";
41 const char *p;
42 const char *c;
43
44 c = colon_space;
45 if (!s || !*s) {
46 c += 2;
47 }
48 p = error_msg;
49 if ((h_errno >= 0) && (h_errno < h_nerr)) {
50 p = h_errlist[h_errno];
51 }
52 fprintf(stderr, "%s%s%s\n", s, c, p);
53 }
libc_hidden_def(herror)54 libc_hidden_def(herror)
55
56
57 const char *hstrerror(int err)
58 {
59 if ((unsigned)err < h_nerr)
60 return(h_errlist[err]);
61
62 return error_msg;
63 }
64