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Revision 34546

merge revision(s) 34043,34045,34132: [Backport #5791]

* win32/win32.c, include/ruby/win32.h (rb_w32_fd_is_text): new function.

* win32/win32.c (init_stdhandle): set default mode of stdin as binmode.

* io.c (set_binary_mode_with_seek_cur): new function to replace
  SET_BINARY_MODE_WITH_SEEK_CUR macro.  now returns previous mode of the
  fd and take care of LF in rbuf.

* io.c (do_writeconv): set text mode when needed.

* io.c (io_read): need to change the mode of the IO to binmode
  temporally when the length for IO#read, because IO#read with length
  must behave so.

* test/ruby/test_io_m17n.rb (TestIO_M17N#est_{read_with_length,
  read_with_binmode_and_get[cs],read_write_with_binmode}): tests for
  above changes.
all patches are written by Hiroshi Shirosaki. [ruby-core:41496]
[Feature #5714]

* test/ruby/test_io_m17n.rb
  (TestIO_M17N#test_{read_with_binmode_and_get[cs]}): only for Windows.

* test/ruby/test_io_m17n.rb (TestIO_M17N#test_{read_with_length,

* io.c (rb_sys_fail_path): move the definition.
  Move above for using it in set_binary_mode_with_seek_cur().

* io.c (set_binary_mode_with_seek_cur): fix improper seek cursor.
  Seeking file cursor with setting binary mode has possibility to
  cause infinite loop. Fixed the bug and refined error handling.
  Introduced at r34043.
  And cleanups as below.
  Remove unnecessary parentheses of `fptr`.
  Use return value of setmode().

* test/ruby/test_io_m17n.rb
  (TestIO_M17N#test_seek_with_setting_binmode): add a test for abobe.
  [ruby-core:41671] [Bug #5714]