77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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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 int 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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CAMLprim value unix_lseek(value fd, value ofs, value cmd)
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{
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long ret;
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long ofs_low = Long_val(ofs);
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long ofs_high = ofs_low >= 0 ? 0 : -1;
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long err;
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ret = SetFilePointer(Handle_val(fd), ofs_low, &ofs_high,
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seek_command_table[Int_val(cmd)]);
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if (ret == INVALID_SET_FILE_POINTER) {
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err = GetLastError();
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if (err != NO_ERROR) {
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win32_maperr(err);
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uerror("lseek", Nothing);
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}
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}
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if (ofs_high != 0 || 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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long ret;
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long ofs_low = (long) Int64_val(ofs);
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long ofs_high = (long) (Int64_val(ofs) >> 32);
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long err;
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ret = SetFilePointer(Handle_val(fd), ofs_low, &ofs_high,
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seek_command_table[Int_val(cmd)]);
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if (ret == INVALID_SET_FILE_POINTER) {
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err = GetLastError();
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if (err != NO_ERROR) {
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win32_maperr(err);
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uerror("lseek", Nothing);
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}
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}
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return copy_int64((int64) ofs_high << 32 | ret);
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}
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