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Certain operating systems do not provide functions which have since
become standardized, or at least common. For example, the Single
Unix Specification Version 2 requires that the basename
function be provided, but an OS which predates that specification
might not have this function. This should not prevent well-written
code from running on such a system.
Similarly, some functions exist only among a particular "flavor"
or "family" of operating systems. As an example, the bzero
function is often not present on systems outside the BSD-derived
family of systems.
Many such functions are provided in libiberty
{}. They are quickly
listed here with little description, as systems which lack them
become less and less common. Each function foo is implemented
in `foo.c' but not declared in any libiberty
{} header file; more
comments and caveats for each function's implementation are often
available in the source file. Generally, the function can simply
be declared as extern
.