1 files changed, 100 insertions, 0 deletions
diff --git a/StdLib/LibC/Stdio/ftello.c b/StdLib/LibC/Stdio/ftello.c
new file mode 100644
index 0000000000..0677d1a355
--- /dev/null
+++ b/StdLib/LibC/Stdio/ftello.c
@@ -0,0 +1,100 @@
+/*  $NetBSD: ftello.c,v 1.4 2003/08/07 16:43:26 agc Exp $ */
+
+/*-
+ * 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.
+ */
+#include  <LibConfig.h>
+#include <sys/EfiCdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: ftello.c,v 1.4 2003/08/07 16:43:26 agc Exp $");
+#endif /* LIBC_SCCS and not lint */
+
+#include "namespace.h"
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include "reentrant.h"
+#include "local.h"
+
+#ifdef __weak_alias
+__weak_alias(ftello, _ftello)
+#endif
+
+/*
+ * ftell: return current offset.
+ */
+off_t
+ftello(FILE *fp)
+{
+  fpos_t pos;
+
+  FLOCKFILE(fp);
+
+  if (fp->_seek == NULL) {
+    FUNLOCKFILE(fp);
+    errno = ESPIPE;     /* historic practice */
+    return ((off_t)-1);
+  }
+
+  /*
+   * Find offset of underlying I/O object, then
+   * adjust for buffered bytes.
+   */
+  __sflush(fp);   /* may adjust seek offset on append stream */
+  if (fp->_flags & __SOFF)
+    pos = fp->_offset;
+  else {
+    pos = (*fp->_seek)(fp->_cookie, (fpos_t)0, SEEK_CUR);
+    if (pos == (fpos_t)-1) {
+      FUNLOCKFILE(fp);
+      return (pos);
+    }
+  }
+  if (fp->_flags & __SRD) {
+    /*
+     * Reading.  Any unread characters (including
+     * those from ungetc) cause the position to be
+     * smaller than that in the underlying object.
+     */
+    pos -= fp->_r;
+    if (HASUB(fp))
+      pos -= fp->_ur;
+  } else if (fp->_flags & __SWR && fp->_p != NULL) {
+    /*
+     * Writing.  Any buffered characters cause the
+     * position to be greater than that in the
+     * underlying object.
+     */
+    pos += fp->_p - fp->_bf._base;
+  }
+  FUNLOCKFILE(fp);
+  return (pos);
+}