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Exercise: K&P's eprintf Library

Consider the "error-handling" library for the Markov program: 

extern	void	eprintf(char *, ...);
extern	void	weprintf(char *, ...);
extern	char	*estrdup(char *);
extern	void	*emalloc(size_t);
extern	void	*erealloc(void *, size_t);
extern	char	*progname(void);
extern	void	setprogname(char *);

What design decisions has it made?

How well does it meet the Interface Design Rules?