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Introduction
************

The standard C library, `libc.a', is automatically linked into your
programs by the `gcc' control program.  It provides many of the
functions that are normally associated with C programs.  This document
gives the proper usage information about each of the functions and
variables found in `libc.a'.

For each function or variable that the library provides, the definition
of that symbol will include information on which header files to include
in your source to obtain prototypes and type definitions relevent to the
use of that symbol.

Note that many of the functions in `libm.a' (the math library) are
defined in `math.h' but are not present in libc.a.  Some are, which may
get confusing, but the rule of thumb is this - the C library contains
those functions that ANSI dictates must exist, so that you don't need
the `-lm' if you only use ANSI functions.  These functions are,
however, vastly simplified compared to the ANSI spec and the functions
in `libm.a', which includes replacements.  For example, `libc.a''s
`ldexp()' doesn't set `errno' on error, but `libm.a''s `ldexp()' does.