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/*-
* Copyright (c) 2014-2015 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
static const int windows_error_offset = -29000;
/*
* __wt_map_error_to_windows_error --
* Return a negative integer, an encoded Windows error
* Standard C errors are positive integers from 0 - ~200
* Windows errors are from 0 - 15999 according to the documentation
*/
static DWORD
__wt_map_error_to_windows_error(int error) {
/* Ensure we do not exceed the error range
Also validate he do not get any COM errors
(which are negative integers)
*/
WT_ASSERT(NULL, error > 0 && error > -(windows_error_offset));
return (error + -(windows_error_offset));
}
/*
* __wt_map_error_to_windows_error --
* Return a positive integer, a decoded Windows error
*/
static int
__wt_map_windows_error_to_error(DWORD winerr) {
return (winerr + windows_error_offset);
}
/*
* __wt_errno --
* Return errno, or WT_ERROR if errno not set.
*/
int
__wt_errno(void)
{
/*
* Called when we know an error occurred, and we want the system
* error code, but there's some chance it's not set.
*/
DWORD err = GetLastError();
/* GetLastError should only be called if we hit an actual error */
WT_ASSERT(NULL, err != ERROR_SUCCESS);
return (err == ERROR_SUCCESS ?
WT_ERROR : __wt_map_windows_error_to_error(err));
}
/*
* __wt_strerror --
* Windows implementation of wiredtiger_strerror.
*/
const char *
__wt_strerror(int error)
{
const char *p;
/*
* POSIX errors are non-negative integers; check for 0 explicitly
* in-case the underlying strerror doesn't handle 0, some don't.
*/
if (error == 0)
return ("Successful return: 0");
if (error > 0 && (p = strerror(error)) != NULL)
return (p);
return (NULL);
}
/*
* __wt_session_strerror --
* Windows implementation of WT_SESSION.strerror.
*/
const char *
__wt_session_strerror(WT_SESSION_IMPL *session, int error)
{
DWORD lasterror;
const char *p;
char buf[256];
/*
* Check for POSIX errors, Windows errors, then fallback to something
* generic. Copy the string into the user's buffer, return success if
* anything printed.
*/
if ((p = __wt_strerror(error)) != NULL)
return (p);
if (error < 0) {
error = __wt_map_error_to_windows_error(error);
lasterror = FormatMessageA(
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
error,
0, /* let system choose the correct LANGID */
buf,
sizeof(buf),
NULL);
if (lasterror != 0 &&
__wt_buf_set(session, &session->err, buf, strlen(buf)) == 0)
return (session->err.data);
/* Fall through to the fallback error code */
}
/* Defeated. */
return ("Unable to return error string");
}
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