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VAR* var_from_env(const char *, const char *);
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VAR* var_init(VAR* v, const char *name, int name_len, const char *val,
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VAR* var_get(const char *var_name, const char** var_name_end,
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bool raw, bool ignore_not_existing);
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void eval_expr(VAR* v, const char *p, const char** p_end);