Program Listing for File gpa-singleton.h

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#pragma once
#include "gpa-secure.h"
#include <stdlib.h>

namespace gpa {

//Since environment is shared across all the process, we can piggyback on it to store "key/value" pairs for intra-process sharing
struct ProcessWideSingletonRegistry
{
    static void* Get(const char* name, void* fallback = nullptr)  //Gets item by name
    {
        char prefix[256] = {};
        GPA_SPRINTF(prefix, sizeof(prefix), "GPA:%s", name);
        unsigned long long addr = 0;
#ifdef _WIN32
        char val[256] = {};
        size_t res = 0;
        if (0 != getenv_s(&res, val, sizeof(val), prefix) || !res)
            return fallback;
        sscanf_s(val, "%llx", &addr);
#else
        const char* val = getenv(prefix);
        if (!val) return fallback;
        sscanf(val, "%llx", &addr);
#endif
        return (void*)addr;
    }

    static bool Set(const char* name, const void* ptr)  //Stores item by name. ATTENTION: must set to nullptr before previously set object is destroyed!
    {
        char env[256] = {};
        GPA_SPRINTF(env, sizeof(env), "GPA:%s=%llx", name, (unsigned long long)ptr);
#ifdef _WIN32
        return 0 == _putenv(env);
#else
        return 0 == putenv(env);
#endif
    }
};

}  // namespace gpa