[PATCH] binary-io: do not treat set_binary_mode() on stdin/out/err as an error on OS/2

[KO Myung-Hun <komh78@gmail.com>]

Setting stdin/out/err to binary mode is allowed on OS/2. But it's not
useful, because it generates stair-output hard to read.

Instead, let's set them to text mode all the time.

This fixes that tee always crashes at startup if stdin or stdout
are not piped.

* lib/binary-io.c (__gl_setmode_check) [__EMX__]: Remove __EMX__ guard.
* lib/binary-io.h (__gl_setmode_check) [__EMX__]: Remove __EMX__ guard.
(set_binary_mode) [__EMX__]: Override mode with O_TEXT if tty.
---
 lib/binary-io.c | 2 +-
 lib/binary-io.h | 8 +++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/binary-io.c b/lib/binary-io.c
index 01e0bf647..03b98681b 100644
--- a/lib/binary-io.c
+++ b/lib/binary-io.c
@@ -19,7 +19,7 @@
 #define BINARY_IO_INLINE _GL_EXTERN_INLINE
 #include "binary-io.h"
 
-#if defined __DJGPP__ || defined __EMX__
+#if defined __DJGPP__
 # include <errno.h>
 # include <unistd.h>
 
diff --git a/lib/binary-io.h b/lib/binary-io.h
index 720b08c75..75881bd1c 100644
--- a/lib/binary-io.h
+++ b/lib/binary-io.h
@@ -53,7 +53,7 @@ __gl_setmode (int fd _GL_UNUSED, int mode _GL_UNUSED)
 }
 #endif
 
-#if defined __DJGPP__ || defined __EMX__
+#if defined __DJGPP__
 extern int __gl_setmode_check (int);
 #else
 BINARY_IO_INLINE int
@@ -70,6 +70,12 @@ BINARY_IO_INLINE int
 set_binary_mode (int fd, int mode)
 {
   int r = __gl_setmode_check (fd);
+#if defined __EMX__
+  /* On OS/2, setting stdin/out/err to binary is not an error, but
+     non-sense.  */
+  if (isatty (fd))
+    mode = O_TEXT;
+#endif
   return r != 0 ? r : __gl_setmode (fd, mode);
 }
 
-- 
2.13.3