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lib: add generic strnlen_user() function

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This adds a new generic optimized strnlen_user() function that uses the
<asm/word-at-a-time.h> infrastructure to portably do efficient string
handling.

In many ways, strnlen is much simpler than strncpy, and in particular we
can always pre-align the words we load from memory.  That means that all
the worries about alignment etc are a non-issue, so this one can easily
be used on any architecture.  You obviously do have to do the
appropriate word-at-a-time.h macros.

Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Linus Torvalds 2012-05-26 11:06:38 -07:00
commit a08c5356a3
3 changed files with 142 additions and 0 deletions
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lib/Kconfig
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@ -19,6 +19,9 @@ config RATIONAL
config GENERIC_STRNCPY_FROM_USER
bool
config GENERIC_STRNLEN_USER
bool
config GENERIC_FIND_FIRST_BIT
bool