compat/gai_strerror.c

   1 /*****************************************************************************
   2  * gai_strerror.c: gai_strerror() replacement function
   3  *****************************************************************************
   4  * Copyright (C) 2005 the VideoLAN team
   5  * Copyright (C) 2002-2007 Rémi Denis-Courmont
   6  * Copyright (C) 2011-2015 KO Myung-Hun
   7  *
   8  * Authors: KO Myung-Hun <komh@chollian.net>
   9  *          Rémi Denis-Courmont <rem # videolan.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU Lesser General Public License as published by
  13  * the Free Software Foundation; either version 2.1 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  24  *****************************************************************************/
  25
  26 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 /* GAI error codes. See include/vlc_network.h. */
  31 #ifndef EAI_BADFLAGS
  32 # define EAI_BADFLAGS -1
  33 #endif
  34 #ifndef EAI_NONAME
  35 # define EAI_NONAME -2
  36 #endif
  37 #ifndef EAI_AGAIN
  38 # define EAI_AGAIN -3
  39 #endif
  40 #ifndef EAI_FAIL
  41 # define EAI_FAIL -4
  42 #endif
  43 #ifndef EAI_NODATA
  44 # define EAI_NODATA -5
  45 #endif
  46 #ifndef EAI_FAMILY
  47 # define EAI_FAMILY -6
  48 #endif
  49 #ifndef EAI_SOCKTYPE
  50 # define EAI_SOCKTYPE -7
  51 #endif
  52 #ifndef EAI_SERVICE
  53 # define EAI_SERVICE -8
  54 #endif
  55 #ifndef EAI_ADDRFAMILY
  56 # define EAI_ADDRFAMILY -9
  57 #endif
  58 #ifndef EAI_MEMORY
  59 # define EAI_MEMORY -10
  60 #endif
  61 #ifndef EAI_OVERFLOW
  62 # define EAI_OVERFLOW -11
  63 #endif
  64 #ifndef EAI_SYSTEM
  65 # define EAI_SYSTEM -12
  66 #endif
  67
  68 static const struct
  69 {
  70     int        code;
  71     const char msg[41];
  72 } gai_errlist[] =
  73 {
  74     { 0,              "Error 0" },
  75     { EAI_BADFLAGS,   "Invalid flag used" },
  76     { EAI_NONAME,     "Host or service not found" },
  77     { EAI_AGAIN,      "Temporary name service failure" },
  78     { EAI_FAIL,       "Non-recoverable name service failure" },
  79     { EAI_NODATA,     "No data for host name" },
  80     { EAI_FAMILY,     "Unsupported address family" },
  81     { EAI_SOCKTYPE,   "Unsupported socket type" },
  82     { EAI_SERVICE,    "Incompatible service for socket type" },
  83     { EAI_ADDRFAMILY, "Unavailable address family for host name" },
  84     { EAI_MEMORY,     "Memory allocation failure" },
  85     { EAI_OVERFLOW,   "Buffer overflow" },
  86     { EAI_SYSTEM,     "System error" },
  87     { 0,              "" },
  88 };
  89
  90 static const char gai_unknownerr[] = "Unrecognized error number";
  91
  92 /****************************************************************************
  93  * Converts an EAI_* error code into human readable english text.
  94  ****************************************************************************/
  95 const char *gai_strerror (int errnum)
  96 {
  97     for (unsigned i = 0; *gai_errlist[i].msg; i++)
  98         if (errnum == gai_errlist[i].code)
  99             return gai_errlist[i].msg;
 100
 101     return gai_unknownerr;
 102 }