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