1 files changed, 93 insertions, 0 deletions
diff --git a/c/src/exec/libcsupport/src/lseek.c b/c/src/exec/libcsupport/src/lseek.c
new file mode 100644
index 0000000000..514f8cd912
--- /dev/null
+++ b/c/src/exec/libcsupport/src/lseek.c
@@ -0,0 +1,93 @@
+/*
+ *  lseek() - POSIX 1003.1b 6.5.3 - Reposition Read/Write File Offset
+ *
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#include <stdio.h>
+
+#include "libio_.h"
+
+off_t lseek(
+  int     fd,
+  off_t   offset,
+  int     whence
+)
+{
+  rtems_libio_t *iop;
+
+  /*
+   *  If this file descriptor is mapped to an external set of handlers,
+   *  then pass the request on to them.
+   */
+
+  if ( rtems_file_descriptor_type( fd ) ) {
+    rtems_libio_lseek_t fp;
+
+    fp = rtems_libio_handlers[rtems_file_descriptor_type_index(fd)].lseek;
+    if ( fp == NULL )
+      set_errno_and_return_minus_one( EBADF );
+
+    return (*fp)( fd, offset, whence );
+  }
+
+  /*
+   *  Now process the lseek().
+   */
+
+  iop = rtems_libio_iop( fd );
+  rtems_libio_check_fd( fd );
+
+  switch ( whence ) {
+    case SEEK_SET:
+      iop->offset = offset;
+      break;
+
+    case SEEK_CUR:
+      iop->offset += offset;
+      break;
+
+    case SEEK_END:
+      iop->offset = iop->size - offset;
+      break;
+
+    default:
+      errno = EINVAL;
+      return -1;
+  }
+
+  if ( !iop->handlers->lseek )
+    set_errno_and_return_minus_one( ENOTSUP );
+
+  return (*iop->handlers->lseek)( iop, offset, whence );
+}
+
+/*
+ *  _lseek_r
+ *
+ *  This is the Newlib dependent reentrant version of lseek().
+ */
+
+#if defined(RTEMS_NEWLIB)
+
+#include <reent.h>
+
+off_t _lseek_r( 
+  struct _reent *ptr,
+  int            fd,
+  off_t          offset,
+  int            whence
+)
+{
+  return lseek( fd, offset, whence );
+}
+#endif
+