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/****************************************************************************
* Copyright (C) 2014-2015 Intel Corporation. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* @file knobs_init.h
*
* @brief Dynamic Knobs Initialization for Core.
*
******************************************************************************/
#pragma once
#include <core/knobs.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
// Assume the type is compatible with a 32-bit integer
template <typename T>
static inline void ConvertEnvToKnob(const char* pOverride, T& knobValue)
{
uint32_t value = 0;
char* pStopped = nullptr;
value = strtoul(pOverride, &pStopped, 0);
if (pStopped != pOverride)
{
knobValue = static_cast<T>(value);
}
}
static inline void ConvertEnvToKnob(const char* pOverride, bool& knobValue)
{
size_t len = strlen(pOverride);
if (len == 1)
{
auto c = tolower(pOverride[0]);
if (c == 'y' || c == 't' || c == '1')
{
knobValue = true;
return;
}
if (c == 'n' || c == 'f' || c == '0')
{
knobValue = false;
return;
}
}
// Try converting to a number and casting to bool
uint32_t value = 0;
char* pStopped = nullptr;
value = strtoul(pOverride, &pStopped, 0);
if (pStopped != pOverride)
{
knobValue = value != 0;
}
}
static inline void ConvertEnvToKnob(const char* pOverride, float& knobValue)
{
float value = knobValue;
if (sscanf(pOverride, "%f", &value))
{
knobValue = value;
}
}
static inline void ConvertEnvToKnob(const char* pOverride, std::string& knobValue)
{
knobValue = pOverride;
}
template <typename T>
static inline void InitKnob(T& knob)
{
// TODO, read registry first
// Second, read environment variables
const char* pOverride = getenv(knob.Name());
if (pOverride)
{
auto knobValue = knob.Value();
ConvertEnvToKnob(pOverride, knobValue);
knob.Value(knobValue);
}
}
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