Jim Warner 7126cc4491 library: expanded/generalized memory allocation provisions ...

A callback provision in the form of xalloc_err_handler
(of type message_fn) was added to the alloc module.

This change allowed a program like top, who alters the
termios structure, to override the default fprint(stderr...)
behavior in the event of an error.

The new function xstrdup was also added for symmetry.

2011-12-11 22:26:49 +11:00

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