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/*-
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
_Check_return_opt_ int __cdecl _wt_vsnprintf(
_Out_writes_(_MaxCount) char * _DstBuf,
_In_ size_t _MaxCount,
_In_z_ _Printf_format_string_ const char * _Format,
va_list _ArgList)
{
int len;
/*
* WiredTiger will call with length 0 to get the needed buffer size
* We call the count only version in this case since vsnprintf_s assumes
* length is greater than zero or else it triggers the invalid_parameter
* handler.
*/
if (_MaxCount == 0) {
return _vscprintf(_Format, _ArgList);
}
len = (size_t)_vsnprintf_s(
_DstBuf, _MaxCount, _TRUNCATE, _Format, _ArgList);
/*
* The MSVC implementation returns -1 on truncation instead of what
* it would have written. We could let callers iteratively grow the
* buffer, or just ask us how big a buffer they would like.
*/
if (len == -1)
len = _vscprintf(_Format, _ArgList) + 1;
return (len);
}
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