1  /* HOSTALIASES-based name resolution.  Public legacy functions.
       2     Copyright (C) 2017-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <netdb.h>
      20  #include <resolv-internal.h>
      21  #include <resolv_context.h>
      22  
      23  /* Common part of res_hostalias and hostalias.  */
      24  static const char *
      25  context_hostalias_common (struct resolv_context *ctx,
      26                            const char *name, char *dst, size_t siz)
      27  {
      28    if (ctx == NULL)
      29      {
      30        RES_SET_H_ERRNO (&_res, NETDB_INTERNAL);
      31        return NULL;
      32      }
      33    const char *result = __res_context_hostalias (ctx, name, dst, siz);
      34    __resolv_context_put (ctx);
      35    return result;
      36  }
      37  
      38  const char *
      39  res_hostalias (res_state statp, const char *name, char *dst, size_t siz)
      40  {
      41    return context_hostalias_common
      42      (__resolv_context_get_override (statp), name, dst, siz);
      43  }
      44  
      45  const char *
      46  hostalias (const char *name)
      47  {
      48    static char abuf[MAXDNAME];
      49    return context_hostalias_common
      50      (__resolv_context_get (), name, abuf, sizeof (abuf));
      51  }