1 files changed, 135 insertions, 0 deletions
diff --git a/lib/libc/stdio/ftell.c b/lib/libc/stdio/ftell.c
new file mode 100644
index 0000000..2c8800c
--- /dev/null
+++ b/lib/libc/stdio/ftell.c
@@ -0,0 +1,135 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)ftell.c	8.2 (Berkeley) 5/4/95";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "namespace.h"
+#include <sys/types.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include "un-namespace.h"
+#include "local.h"
+#include "libc_private.h"
+
+/*
+ * standard ftell function.
+ */
+long
+ftell(FILE *fp)
+{
+	off_t rv;
+
+	rv = ftello(fp);
+	if (rv > LONG_MAX) {
+		errno = EOVERFLOW;
+		return (-1);
+	}
+	return (rv);
+}
+
+/*
+ * ftello: return current offset.
+ */
+off_t
+ftello(FILE *fp)
+{
+	fpos_t rv;
+	int ret;
+
+	FLOCKFILE(fp);
+	ret = _ftello(fp, &rv);
+	FUNLOCKFILE(fp);
+	if (ret)
+		return (-1);
+	if (rv < 0) {   /* Unspecified value because of ungetc() at 0 */
+		errno = ESPIPE;
+		return (-1);
+	}
+	return (rv);
+}
+
+int
+_ftello(FILE *fp, fpos_t *offset)
+{
+	fpos_t pos;
+	size_t n;
+
+	if (fp->_seek == NULL) {
+		errno = ESPIPE;			/* historic practice */
+		return (1);
+	}
+
+	/*
+	 * Find offset of underlying I/O object, then
+	 * adjust for buffered bytes.
+	 */
+	if (fp->_flags & __SOFF)
+		pos = fp->_offset;
+	else {
+		pos = _sseek(fp, (fpos_t)0, SEEK_CUR);
+		if (pos == -1)
+			return (1);
+	}
+	if (fp->_flags & __SRD) {
+		/*
+		 * Reading.  Any unread characters (including
+		 * those from ungetc) cause the position to be
+		 * smaller than that in the underlying object.
+		 */
+		if ((pos -= (HASUB(fp) ? fp->_ur : fp->_r)) < 0) {
+			fp->_flags |= __SERR;
+			errno = EIO;
+			return (1);
+		}
+		if (HASUB(fp))
+			pos -= fp->_r;  /* Can be negative at this point. */
+	} else if ((fp->_flags & __SWR) && fp->_p != NULL) {
+		/*
+		 * Writing.  Any buffered characters cause the
+		 * position to be greater than that in the
+		 * underlying object.
+		 */
+		n = fp->_p - fp->_bf._base;
+		if (pos > OFF_MAX - n) {
+			errno = EOVERFLOW;
+			return (1);
+		}
+		pos += n;
+	}
+	*offset = pos;
+	return (0);
+}