external/bsd/bind/dist/lib/lwres/gai_strerror.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004-2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 2000, 2001  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: gai_strerror.c,v 1.22 2007/06/19 23:47:22 tbox Exp */
  21
  22 /*! \file gai_strerror.c
  23  * lwres_gai_strerror() returns an error message corresponding to an
  24  * error code returned by getaddrinfo(). The following error codes and
  25  * their meaning are defined in \link netdb.h include/lwres/netdb.h.\endlink
  26  *
  27  * \li #EAI_ADDRFAMILY address family for hostname not supported
  28  * \li #EAI_AGAIN temporary failure in name resolution
  29  * \li #EAI_BADFLAGS invalid value for #ai_flags
  30  * \li #EAI_FAIL non-recoverable failure in name resolution
  31  * \li #EAI_FAMILY ai_family not supported
  32  * \li #EAI_MEMORY memory allocation failure
  33  * \li #EAI_NODATA no address associated with hostname
  34  * \li #EAI_NONAME hostname or servname not provided, or not known
  35  * \li #EAI_SERVICE servname not supported for ai_socktype
  36  * \li #EAI_SOCKTYPE ai_socktype not supported
  37  * \li #EAI_SYSTEM system error returned in errno
  38  *
  39  * The message invalid error code is returned if ecode is out of range.
  40  *
  41  * ai_flags, ai_family and ai_socktype are elements of the struct
  42  * addrinfo used by lwres_getaddrinfo().
  43  *
  44  * \section gai_strerror_see See Also
  45  *
  46  * strerror, lwres_getaddrinfo(), getaddrinfo(), RFC2133.
  47  */
  48
  49 #include <config.h>
  50
  51 #include <lwres/netdb.h>
  52
  53 /*% Text of error messages. */
  54 static const char *gai_messages[] = {
  55         "no error",
  56         "address family for hostname not supported",
  57         "temporary failure in name resolution",
  58         "invalid value for ai_flags",
  59         "non-recoverable failure in name resolution",
  60         "ai_family not supported",
  61         "memory allocation failure",
  62         "no address associated with hostname",
  63         "hostname nor servname provided, or not known",
  64         "servname not supported for ai_socktype",
  65         "ai_socktype not supported",
  66         "system error returned in errno",
  67         "bad hints",
  68         "bad protocol"
  69 };
  70
  71 /*% Returns an error message corresponding to an error code returned by getaddrinfo() */
  72 char *
  73 lwres_gai_strerror(int ecode) {
  74         union {
  75                 const char *const_ptr;
  76                 char *deconst_ptr;
  77         } ptr;
  78
  79         if ((ecode < 0) ||
  80             (ecode >= (int)(sizeof(gai_messages)/sizeof(*gai_messages))))
  81                 ptr.const_ptr = "invalid error code";
  82         else
  83                 ptr.const_ptr = gai_messages[ecode];
  84         return (ptr.deconst_ptr);
  85 }