kc3-lang/gnulib/lib/xgethostname.c

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• Hash : 281b825e
  Author :
  Date : 2018-01-01T00:57:25
  

  maint: Run 'make update-copyright'
  

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• lib/xgethostname.c

• /* xgethostname.c -- return current hostname with unlimited length
  
     Copyright (C) 1992, 1996, 2000-2001, 2003-2006, 2009-2018 Free Software
     Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* written by Jim Meyering */
  
  #include <config.h>
  
  /* Specification.  */
  #include "xgethostname.h"
  
  #include <stdlib.h>
  #include <errno.h>
  #include <unistd.h>
  
  #include "xalloc.h"
  
  #ifndef INITIAL_HOSTNAME_LENGTH
  # define INITIAL_HOSTNAME_LENGTH 34
  #endif
  
  /* Return the current hostname in malloc'd storage.
     If malloc fails, exit.
     Upon any other failure, return NULL and set errno.  */
  char *
  xgethostname (void)
  {
    char *hostname = NULL;
    size_t size = INITIAL_HOSTNAME_LENGTH;
  
    while (1)
      {
        /* Use SIZE_1 here rather than SIZE to work around the bug in
           SunOS 5.5's gethostname whereby it NUL-terminates HOSTNAME
           even when the name is as long as the supplied buffer.  */
        size_t size_1;
  
        hostname = x2realloc (hostname, &size);
        size_1 = size - 1;
        hostname[size_1 - 1] = '\0';
        errno = 0;
  
        if (gethostname (hostname, size_1) == 0)
          {
            if (! hostname[size_1 - 1])
              break;
          }
        else if (errno != 0 && errno != ENAMETOOLONG && errno != EINVAL
                 /* OSX/Darwin does this when the buffer is not large enough */
                 && errno != ENOMEM)
          {
            int saved_errno = errno;
            free (hostname);
            errno = saved_errno;
            return NULL;
          }
      }
  
    return hostname;
  }
  

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