libc/inet/herror.c

   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  */
  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 }
  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 }