Names reserved for expansion
In addition to all the names explicitly reserved,
the Standard also reserves
(for implementations and future standards)
names matching certain patterns:
errno.h E[0-9A-Z].*
ctype.h (to|is)[a-z].*
locale.h LC_[A-Z].*
math.h current function names[fl]
signal.h (SIG|SIG_)[A-Z].*
stdlib.h str[a-z].*
string.h (str|mem|wcs)[a-z].*
In the above lists,
names that begin with a capital letter are macros
and are thus reserved only when the associated header is included.
The rest of the names designate functions
and therefore cannot be used to name any global objects
or functions.
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UnixWare 7 Release 7.1.4 - 27 April 2004