OpenSolaris Launch

1 files changed, 90 insertions, 0 deletions

diff --git a/usr/src/lib/libc/port/stdio/ftell.c b/usr/src/lib/libc/port/stdio/ftell.c
new file mode 100644
index 0000000000..831ef96cad
--- /dev/null
+++ b/usr/src/lib/libc/port/stdio/ftell.c
@@ -0,0 +1,90 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+/*	Copyright (c) 1988 AT&T	*/
+/*	  All Rights Reserved  	*/
+
+
+/*
+ * Return file offset.
+ * Coordinates with buffering.
+ */
+#pragma weak ftell = _ftell
+
+#include "synonyms.h"
+#include "file64.h"
+#include "mtlib.h"
+#include <fcntl.h>
+#include <stdio.h>
+#include <thread.h>
+#include <synch.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <limits.h>
+#include <sys/types.h>
+#include "stdiom.h"
+
+long
+ftell(FILE *iop)
+{
+	ptrdiff_t adjust;
+	off64_t	tres;
+	rmutex_t *lk;
+
+	FLOCKFILE(lk, iop);
+	if (iop->_cnt < 0)
+		iop->_cnt = 0;
+	if (iop->_flag & _IOREAD)
+		adjust = (ptrdiff_t)-iop->_cnt;
+	else if (iop->_flag & (_IOWRT | _IORW)) {
+		adjust = 0;
+		if (((iop->_flag & (_IOWRT | _IONBF)) == _IOWRT) &&
+						(iop->_base != 0))
+			adjust = iop->_ptr - iop->_base;
+		else if ((iop->_flag & _IORW) && (iop->_base != 0))
+			adjust = (ptrdiff_t)-iop->_cnt;
+	} else {
+		errno = EBADF;	/* file descriptor refers to no open file */
+		FUNLOCKFILE(lk);
+		return (EOF);
+	}
+
+	tres = lseek64(FILENO(iop), 0, SEEK_CUR);
+	if (tres >= 0)
+		tres += adjust;
+
+	if (tres > LONG_MAX) {
+		errno = EOVERFLOW;
+		FUNLOCKFILE(lk);
+		return (EOF);
+	}
+
+	FUNLOCKFILE(lk);
+	return ((long)tres);
+}