kc3-lang/gnulib/lib/getlogin_r.c

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• Hash : 71090a2a
  Author :
  Date : 2016-01-01T00:56:19
  

  version-etc: new year
  
  * build-aux/gendocs.sh (version):
  * doc/gendocs_template:
  * doc/gendocs_template_min:
  * doc/gnulib.texi:
  * lib/version-etc.c (COPYRIGHT_YEAR):
  Update copyright dates by hand in templates and the like.
  * all files: Run 'make update-copyright'.
  

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• lib/getlogin_r.c

• /* Provide a working getlogin_r for systems which lack it.
  
     Copyright (C) 2005-2007, 2010-2016 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 2, 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 <http://www.gnu.org/licenses/>.  */
  
  /* Written by Paul Eggert, Derek Price, and Bruno Haible.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <unistd.h>
  
  #include <errno.h>
  #include <string.h>
  
  #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
  # define WIN32_LEAN_AND_MEAN
  # include <windows.h>
  #else
  # if !HAVE_DECL_GETLOGIN
  extern char *getlogin (void);
  # endif
  #endif
  
  /* See unistd.in.h for documentation.  */
  int
  getlogin_r (char *name, size_t size)
  {
  #undef getlogin_r
  #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
    /* Native Windows platform.  */
    DWORD sz;
  
    /* When size > 0x7fff, the doc says that GetUserName will fail.
       Actually, on Windows XP SP3, it succeeds.  But let's be safe,
       for the sake of older Windows versions.  */
    if (size > 0x7fff)
      size = 0x7fff;
    sz = size;
    if (!GetUserName (name, &sz))
      {
        if (GetLastError () == ERROR_INSUFFICIENT_BUFFER)
          /* In this case, the doc says that sz contains the required size, but
             actually, on Windows XP SP3, it contains 2 * the required size.  */
          return ERANGE;
        else
          return ENOENT;
      }
    return 0;
  #elif HAVE_GETLOGIN_R
    /* Platform with a getlogin_r() function.  */
    int ret = getlogin_r (name, size);
  
    if (ret == 0 && memchr (name, '\0', size) == NULL)
      /* name contains a truncated result.  */
      return ERANGE;
    return ret;
  #else
    /* Platform with a getlogin() function.  */
    char *n;
    size_t nlen;
  
    errno = 0;
    n = getlogin ();
    if (!n)
      /* ENOENT is a reasonable errno value if getlogin returns NULL.  */
      return (errno != 0 ? errno : ENOENT);
  
    nlen = strlen (n);
    if (size <= nlen)
      return ERANGE;
    memcpy (name, n, nlen + 1);
    return 0;
  #endif
  }
  

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