71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
/***********************************************************************/
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/* */
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/* OCaml */
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/* */
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/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* en Automatique. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License, with */
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/* the special exception on linking described in file ../../LICENSE. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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#include <mlvalues.h>
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#include <alloc.h>
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#include "unixsupport.h"
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#ifdef HAS_UNISTD
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#include <unistd.h>
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#else
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#define SEEK_SET 0
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#define SEEK_CUR 1
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#define SEEK_END 2
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#endif
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static DWORD seek_command_table[] = {
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FILE_BEGIN, FILE_CURRENT, FILE_END
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};
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#ifndef INVALID_SET_FILE_POINTER
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#define INVALID_SET_FILE_POINTER (-1)
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#endif
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static __int64 caml_set_file_pointer(HANDLE h, __int64 dist, DWORD mode)
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{
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LARGE_INTEGER i;
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DWORD err;
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i.QuadPart = dist;
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i.LowPart = SetFilePointer(h, i.LowPart, &i.HighPart, mode);
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if (i.LowPart == INVALID_SET_FILE_POINTER) {
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err = GetLastError();
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if (err != NO_ERROR) { win32_maperr(err); uerror("lseek", Nothing); }
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}
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return i.QuadPart;
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}
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CAMLprim value unix_lseek(value fd, value ofs, value cmd)
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{
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__int64 ret;
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ret = caml_set_file_pointer(Handle_val(fd), Long_val(ofs),
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seek_command_table[Int_val(cmd)]);
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if (ret > Max_long) {
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win32_maperr(ERROR_ARITHMETIC_OVERFLOW);
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uerror("lseek", Nothing);
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}
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return Val_long(ret);
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}
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CAMLprim value unix_lseek_64(value fd, value ofs, value cmd)
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{
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__int64 ret;
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ret = caml_set_file_pointer(Handle_val(fd), Int64_val(ofs),
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seek_command_table[Int_val(cmd)]);
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return copy_int64(ret);
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}
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