import newlib-2000-02-17 snapshot

1 files changed, 99 insertions, 0 deletions

diff --git a/newlib/libc/stdio/fflush.c b/newlib/libc/stdio/fflush.c
new file mode 100644
index 000000000..635e5a738
--- /dev/null
+++ b/newlib/libc/stdio/fflush.c
@@ -0,0 +1,99 @@
+/*
+ * 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.
+ */
+
+/*
+FUNCTION
+<<fflush>>---flush buffered file output
+
+INDEX
+	fflush
+
+ANSI_SYNOPSIS
+	#include <stdio.h>
+	int fflush(FILE *<[fp]>);
+
+TRAD_SYNOPSIS
+	#include <stdio.h>
+	int fflush(<[fp]>)
+	FILE *<[fp]>;
+
+DESCRIPTION
+The <<stdio>> output functions can buffer output before delivering it
+to the host system, in order to minimize the overhead of system calls.
+
+Use <<fflush>> to deliver any such pending output (for the file
+or stream identified by <[fp]>) to the host system.
+
+If <[fp]> is <<NULL>>, <<fflush>> delivers pending output from all
+open files.
+
+RETURNS
+<<fflush>> returns <<0>> unless it encounters a write error; in that
+situation, it returns <<EOF>>.
+
+PORTABILITY
+ANSI C requires <<fflush>>.
+
+No supporting OS subroutines are required.
+*/
+
+#include <stdio.h>
+#include "local.h"
+
+/* Flush a single file, or (if fp is NULL) all files.  */
+
+int
+_DEFUN (fflush, (fp),
+	register FILE * fp)
+{
+  register unsigned char *p;
+  register int n, t;
+
+
+
+
+  if (fp == NULL)
+    return _fwalk (_REENT, fflush);
+
+  CHECK_INIT (fp);
+
+  t = fp->_flags;
+  if ((t & __SWR) == 0 || (p = fp->_bf._base) == NULL)
+    return 0;
+  n = fp->_p - p;		/* write this much */
+
+  /*
+   * Set these immediately to avoid problems with longjmp
+   * and to allow exchange buffering (via setvbuf) in user
+   * write function.
+   */
+  fp->_p = p;
+  fp->_w = t & (__SLBF | __SNBF) ? 0 : fp->_bf._size;
+
+  while (n > 0)
+    {
+      t = (*fp->_write) (fp->_cookie, (char *) p, n);
+      if (t <= 0)
+	{
+	  fp->_flags |= __SERR;
+	  return EOF;
+	}
+      p += t;
+      n -= t;
+    }
+  return 0;
+}