1 files changed, 79 insertions, 0 deletions
diff --git a/newlib/libc/stdio/wsetup.c b/newlib/libc/stdio/wsetup.c
new file mode 100644
index 00000000000..23b032efef1
--- /dev/null
+++ b/newlib/libc/stdio/wsetup.c
@@ -0,0 +1,79 @@
+/* No user fns here. Pesch 15apr92. */
+
+/*
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "local.h"
+
+/*
+ * Various output routines call wsetup to be sure it is safe to write,
+ * because either _flags does not include __SWR, or _buf is NULL.
+ * _wsetup returns 0 if OK to write, nonzero otherwise.
+ */
+
+int
+_DEFUN (__swsetup, (fp),
+	register FILE * fp)
+{
+  /* Make sure stdio is set up.  */
+
+  CHECK_INIT (fp);
+
+  /*
+   * If we are not writing, we had better be reading and writing.
+   */
+
+  if ((fp->_flags & __SWR) == 0)
+    {
+      if ((fp->_flags & __SRW) == 0)
+	return EOF;
+      if (fp->_flags & __SRD)
+	{
+	  /* clobber any ungetc data */
+	  if (HASUB (fp))
+	    FREEUB (fp);
+	  fp->_flags &= ~(__SRD | __SEOF);
+	  fp->_r = 0;
+	  fp->_p = fp->_bf._base;
+	}
+      fp->_flags |= __SWR;
+    }
+
+  /*
+   * Make a buffer if necessary, then set _w.
+   */
+  /* NOT NEEDED FOR CYGNUS SPRINTF ONLY jpg */
+  if (fp->_bf._base == NULL)
+    __smakebuf (fp);
+
+  if (fp->_flags & __SLBF)
+    {
+      /*
+       * It is line buffered, so make _lbfsize be -_bufsize
+       * for the putc() macro.  We will change _lbfsize back
+       * to 0 whenever we turn off __SWR.
+       */
+      fp->_w = 0;
+      fp->_lbfsize = -fp->_bf._size;
+    }
+  else
+    fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size;
+
+  return 0;
+}