File: getenv

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list g_env;         // set to env in main()
int g_envvar;    // set to the env var if defined

string my_getenv(string var)
{
    int idx;

    for (idx = sizeof(g_env); idx; )
    {
        idx -= 2;
        if (element(idx, g_env) == var)
        {
            g_envvar = 1;
            return element(idx + 1, g_env);
        }
    }
    g_envvar = 0;
    return "";
}