1 files changed, 100 insertions, 0 deletions
diff --git a/libio/iosetvbuf.c b/libio/iosetvbuf.c
new file mode 100644
index 0000000..65eeea5
--- /dev/null
+++ b/libio/iosetvbuf.c
@@ -0,0 +1,100 @@
+/* Copyright (C) 1993, 1996, 1997 Free Software Foundation, Inc.
+   This file is part of the GNU IO Library.
+
+   This library 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 library 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 library; see the file COPYING.  If not, write to
+   the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.
+
+   As a special exception, if you link this library with files
+   compiled with a GNU compiler to produce an executable, this does
+   not cause the resulting executable to be covered by the GNU General
+   Public License.  This exception does not however invalidate any
+   other reasons why the executable file might be covered by the GNU
+   General Public License.  */
+
+#include "libioP.h"
+
+#define _IOFBF 0 /* Fully buffered. */
+#define _IOLBF 1 /* Line buffered. */
+#define _IONBF 2 /* No buffering. */
+
+int
+_IO_setvbuf (fp, buf, mode, size)
+     _IO_FILE *fp;
+     char *buf;
+     int mode;
+     _IO_size_t size;
+{
+  int result;
+  CHECK_FILE (fp, EOF);
+  _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
+  _IO_flockfile (fp);
+  switch (mode)
+    {
+    case _IOFBF:
+      fp->_IO_file_flags &= ~_IO_LINE_BUF|_IO_UNBUFFERED;
+      if (buf == NULL)
+	{
+	  if (fp->_IO_buf_base == NULL)
+	    {
+	      /* There is no flag to distinguish between "fully buffered
+		 mode has been explicitly set" as opposed to "line
+		 buffering has not been explicitly set".  In both
+		 cases, _IO_LINE_BUF is off.  If this is a tty, and
+		 _IO_filedoalloc later gets called, it cannot know if
+		 it should set the _IO_LINE_BUF flag (because that is
+		 the default), or not (because we have explicitly asked
+		 for fully buffered mode).  So we make sure a buffer
+		 gets allocated now, and explicitly turn off line
+		 buffering.
+
+		 A possibly cleaner alternative would be to add an
+		 extra flag, but then flags are a finite resource.  */
+	      if (_IO_DOALLOCATE (fp) < 0)
+		{
+		  result = EOF;
+		  goto unlock_return;
+		}
+	      fp->_IO_file_flags &= ~_IO_LINE_BUF;
+	    }
+	  result = 0;
+	  goto unlock_return;
+	}
+      break;
+    case _IOLBF:
+      fp->_IO_file_flags &= ~_IO_UNBUFFERED;
+      fp->_IO_file_flags |= _IO_LINE_BUF;
+      if (buf == NULL)
+	{
+	  result = 0;
+	  goto unlock_return;
+	}
+      break;
+    case _IONBF:
+      buf = NULL;
+      size = 0;
+      break;
+    default:
+      result = EOF;
+      goto unlock_return;
+    }
+  result = _IO_SETBUF (fp, buf, size) == NULL ? EOF : 0;
+unlock_return:
+  _IO_cleanup_region_end (1);
+  return result;
+}
+
+#ifdef weak_alias
+weak_alias (_IO_setvbuf, setvbuf)
+#endif