builtin sscanf
Jeff Law
law@redhat.com
Tue Oct 18 16:45:00 GMT 2016
On 10/13/2016 01:03 AM, fedor_qd@mail.ru wrote:
> Are GCC builtin function sscanf, strtod and atof independent from libc provided by os?
> Always yours, Fiodar Stryzniou
They are largely independent -- though GCC has knowledge of the
requirements imposed by POSIX and assumes those requirements except in a
freestanding implementation.
GCC sometimes has small amounts of knowledge of the implementation. For
example, it knows about how the implmementation handles certain
formatting which vary across implemetations (%p for example). That
knowledge is used to give more precise buffer overflow warnings and can
be used to optimize return values from certain *printf calls.
Jeff
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