kc3-lang/gnulib/lib/isatty.c

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• Hash : 39065e3b
  Author :
  Date : 2012-01-03T13:52:36
  

  isatty: Support for MSVC 9.
  
  * doc/posix-functions/isatty.texi: Mention the MSVC problem.
  * lib/isatty.c: Include <errno.h>, msvc-inval.h.
  (_isatty_nothrow): New function.
  (isatty): Use it instead of _isatty.
  (IsConsoleHandle): Add comment, from Paolo Bonzini.
  * lib/poll.c (IsConsoleHandle): Likewise.
  * lib/select.c (IsConsoleHandle): Likewise.
  * m4/isatty.m4 (gl_FUNC_ISATTY): Fix comment. Reported by Eli Zaretskii.
  (gl_PREREQ_ISATTY): New macro.
  * modules/isatty (Depends-on): Add msvc-inval.
  (configure.ac): Invoke gl_PREREQ_ISATTY.
  

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• lib/isatty.c

• /* isatty() replacement.
     Copyright (C) 2012 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 <http://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <unistd.h>
  
  /* This replacement is enabled on native Windows.  */
  
  #include <errno.h>
  
  /* Get declarations of the Win32 API functions.  */
  #define WIN32_LEAN_AND_MEAN
  #include <windows.h>
  
  #include "msvc-inval.h"
  
  /* Get _get_osfhandle().  */
  #include "msvc-nothrow.h"
  
  /* Optimized test whether a HANDLE refers to a console.
     See <http://lists.gnu.org/archive/html/bug-gnulib/2009-08/msg00065.html>.  */
  #define IsConsoleHandle(h) (((long) (h) & 3) == 3)
  
  #if HAVE_MSVC_INVALID_PARAMETER_HANDLER
  static inline int
  _isatty_nothrow (int fd)
  {
    int result;
  
    TRY_MSVC_INVAL
      {
        result = _isatty (fd);
      }
    CATCH_MSVC_INVAL
      {
        result = -1;
        errno = EBADF;
      }
    DONE_MSVC_INVAL;
  
    return result;
  }
  #else
  # define _isatty_nothrow _isatty
  #endif
  
  int
  isatty (int fd)
  {
    /* _isatty (fd) tests whether GetFileType of the handle is FILE_TYPE_CHAR.  */
    if (_isatty_nothrow (fd))
      {
        HANDLE h = (HANDLE) _get_osfhandle (fd);
        return IsConsoleHandle (h);
      }
    else
      return 0;
  }
  

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