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/**************************************************************************/
/* */
/* OCaml */
/* */
/* 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 Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
#include <caml/mlvalues.h>
#include <caml/alloc.h>
#include <caml/signals.h>
#include "caml/unixsupport.h"
#ifdef HAS_UNISTD
#include <unistd.h>
#else
#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2
#endif
static const DWORD seek_command_table[] = {
FILE_BEGIN, FILE_CURRENT, FILE_END
};
#ifndef INVALID_SET_FILE_POINTER
#define INVALID_SET_FILE_POINTER (-1)
#endif
CAMLprim value caml_unix_lseek(value fd, value ofs, value cmd)
{
LARGE_INTEGER i;
HANDLE h = Handle_val(fd);
BOOL success;
i.QuadPart = Long_val(ofs);
caml_enter_blocking_section();
success = SetFilePointerEx(h, i, &i, seek_command_table[Int_val(cmd)]);
caml_leave_blocking_section();
if (!success) {
caml_win32_maperr(GetLastError());
caml_uerror("lseek", Nothing);
}
if (i.QuadPart > Max_long) {
caml_win32_maperr(ERROR_ARITHMETIC_OVERFLOW);
caml_uerror("lseek", Nothing);
}
return Val_long(i.QuadPart);
}
CAMLprim value caml_unix_lseek_64(value fd, value ofs, value cmd)
{
LARGE_INTEGER i;
HANDLE h = Handle_val(fd);
BOOL success;
i.QuadPart = Long_val(ofs);
caml_enter_blocking_section();
success = SetFilePointerEx(h, i, &i, seek_command_table[Int_val(cmd)]);
caml_leave_blocking_section();
if (!success) {
caml_win32_maperr(GetLastError());
caml_uerror("lseek", Nothing);
}
return caml_copy_int64(i.QuadPart);
}
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