newlib: add rewind.c

git-svn-id: svn://kolibrios.org@5198 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/newlib/libc/stdio/rewind.c

@@ -0,0 +1,81 @@
+/*
+ * 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
+<<rewind>>---reinitialize a file or stream
+
+INDEX
+	rewind
+INDEX
+	_rewind_r
+
+ANSI_SYNOPSIS
+	#include <stdio.h>
+	void rewind(FILE *<[fp]>);
+	void _rewind_r(struct _reent *<[ptr]>, FILE *<[fp]>);
+
+TRAD_SYNOPSIS
+	#include <stdio.h>
+	void rewind(<[fp]>)
+	FILE *<[fp]>;
+
+	void _rewind_r(<[ptr]>, <[fp]>)
+	struct _reent *<[ptr]>;
+	FILE *<[fp]>;
+
+DESCRIPTION
+<<rewind>> returns the file position indicator (if any) for the file
+or stream identified by <[fp]> to the beginning of the file.  It also
+clears any error indicator and flushes any pending output.
+
+RETURNS
+<<rewind>> does not return a result.
+
+PORTABILITY
+ANSI C requires <<rewind>>.
+
+No supporting OS subroutines are required.
+*/
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "%W% (Berkeley) %G%";
+#endif /* LIBC_SCCS and not lint */
+
+#include <_ansi.h>
+#include <reent.h>
+#include <stdio.h>
+
+_VOID
+_DEFUN(_rewind_r, (ptr, fp),
+       struct _reent * ptr _AND
+       register FILE * fp)
+{
+  _CAST_VOID _fseek_r (ptr, fp, 0L, SEEK_SET);
+  clearerr (fp);
+}
+
+#ifndef _REENT_ONLY
+
+_VOID
+_DEFUN(rewind, (fp),
+       register FILE * fp)
+{
+  _rewind_r (_REENT, fp);
+}
+
+#endif /* !_REENT_ONLY */