1 files changed, 70 insertions, 0 deletions
diff --git a/ocaml-binary-annot/otherlibs/win32unix/lseek.c b/ocaml-binary-annot/otherlibs/win32unix/lseek.c
new file mode 100644
index 0000000000..9619fcc92a
--- /dev/null
+++ b/ocaml-binary-annot/otherlibs/win32unix/lseek.c
@@ -0,0 +1,70 @@
+/***********************************************************************/
+/*                                                                     */
+/*                           Objective Caml                            */
+/*                                                                     */
+/*            Xavier Leroy, projet Cristal, INRIA Rocquencourt         */
+/*                                                                     */
+/*  Copyright 1996 Institut National de Recherche en Informatique et   */
+/*  en Automatique.  All rights reserved.  This file is distributed    */
+/*  under the terms of the GNU Library General Public License, with    */
+/*  the special exception on linking described in file ../../LICENSE.  */
+/*                                                                     */
+/***********************************************************************/
+
+/* $Id$ */
+
+#include <mlvalues.h>
+#include <alloc.h>
+#include "unixsupport.h"
+
+#ifdef HAS_UNISTD
+#include <unistd.h>
+#else
+#define SEEK_SET 0
+#define SEEK_CUR 1
+#define SEEK_END 2
+#endif
+
+static DWORD seek_command_table[] = {
+  FILE_BEGIN, FILE_CURRENT, FILE_END
+};
+
+#ifndef INVALID_SET_FILE_POINTER
+#define INVALID_SET_FILE_POINTER (-1)
+#endif
+
+static __int64 caml_set_file_pointer(HANDLE h, __int64 dist, DWORD mode)
+{
+  LARGE_INTEGER i;
+  DWORD err;
+
+  i.QuadPart = dist;
+  i.LowPart = SetFilePointer(h, i.LowPart, &i.HighPart, mode);
+  if (i.LowPart == INVALID_SET_FILE_POINTER) {
+    err = GetLastError();
+    if (err != NO_ERROR) { win32_maperr(err); uerror("lseek", Nothing); }
+  }
+  return i.QuadPart;
+}
+
+CAMLprim value unix_lseek(value fd, value ofs, value cmd)
+{
+  __int64 ret;
+
+  ret = caml_set_file_pointer(Handle_val(fd), Long_val(ofs),
+                              seek_command_table[Int_val(cmd)]);
+  if (ret > Max_long) {
+    win32_maperr(ERROR_ARITHMETIC_OVERFLOW);
+    uerror("lseek", Nothing);
+  }
+  return Val_long(ret);
+}
+
+CAMLprim value unix_lseek_64(value fd, value ofs, value cmd)
+{
+  __int64 ret;
+
+  ret = caml_set_file_pointer(Handle_val(fd), Int64_val(ofs),
+                              seek_command_table[Int_val(cmd)]);
+  return copy_int64(ret);
+}