config.cpp

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/*
 * Zth (libzth), a cooperative userspace multitasking library.
 * Copyright (C) 2019-2022  Jochem Rutgers
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */
 
#include <libzth/config.h>
#include <libzth/util.h>
 
#include <cstdlib>
#include <cstring>
 
namespace zth {
 
static bool config(char const* name, bool whenUnset)
{
        // NOLINTNEXTLINE(concurrency-mt-unsafe)
        char const* e = getenv(name);
 
        if(!e || !*e)
                return whenUnset;
        else if(strcmp(e, "0") == 0)
                // Explicitly set to disabled
                return false;
        else
                // Any other value is true
                return true;
}
 
bool config(int env, bool whenUnset)
{
        switch(env) {
        case Env::EnableDebugPrint: {
                static bool const e = Config::SupportDebugPrint
                                      && config("ZTH_CONFIG_ENABLE_DEBUG_PRINT", whenUnset);
                return e;
        }
        case Env::DoPerfEvent: {
                static bool const e = config("ZTH_CONFIG_DO_PERF_EVENT", whenUnset);
                return e;
        }
        case Env::PerfSyscall: {
                static bool const e = config("ZTH_CONFIG_PERF_SYSCALL", whenUnset);
                return e;
        }
        case Env::CheckTimesliceOverrun: {
                static bool const e = config("ZTH_CONFIG_CHECK_TIMESLICE_OVERRUN", whenUnset);
                return e;
        }
        default:
                return whenUnset;
        }
}
 
} // namespace zth