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#define STRISEMPTY(s) (((s) != NULL) ? (*(s) == '\0') : TRUE)
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#define OBJEXISTS(p) (((p) != NULL) ? (!access((p), F_OK)) : FALSE)
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#define OBJREADABLE(p) (((p) != NULL) ? (!access((p), R_OK)) : FALSE)
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* Displays the help page specified by topic by calling the help