20 Library introduction [library]

20.2 The C standard library [library.c]

The C++ standard library also makes available the facilities of the C standard library, suitably adjusted to ensure static type safety.
The descriptions of many library functions rely on the C standard library for the semantics of those functions.
In some cases, the signatures specified in this International Standard may be different from the signatures in the C standard library, and additional overloads may be declared in this International Standard, but the behavior and the preconditions (including any preconditions implied by the use of an ISO C restrict qualifier) are the same unless otherwise stated.