tree e4bdb361862de3efd9b907379d0fe3f2ad3f4ae2
parent 72f59c84fd73a0a701ce6448d103e9021c1cb060
author Nick Kralevich <nnk@google.com> 1369957733 -0700
committer Nick Kralevich <nnk@google.com> 1370016466 -0700

FORTIFY_SOURCE: strcat / strncat optimize

__strcat_chk and __strncat_chk are slightly inefficient,
because they end up traversing over the same memory region
two times.

This change optimizes __strcat_chk / __strncat_chk so they
only access the memory once. Although I haven't benchmarked these
changes, it should improve the performance of these functions.

__strlen_chk - expose this function, even if -D_FORTIFY_SOURCE
isn't defined. This is needed to compile libc itself without
-D_FORTIFY_SOURCE.

Change-Id: Id2c70dff55a276b47c59db27a03734d659f84b74