[PATCH 6/8] string: add strcasestr()

[Tom Rini]

On Wed, Jul 08, 2026 at 08:40:59PM +0200, Rasmus Villemoes wrote:
> On Thu, Jul 02 2026, "Simon Glass" <sjg at chromium.org> wrote:
> 
> > Hi Rasmus,
> >
> > On 2026-07-01T17:15:27, Rasmus Villemoes <rv at rasmusvillemoes.dk> wrote:
> >> string: add strcasestr()
> >>
> >> While this is not likely needed by any 'real' driver code, a later
> >> convenience addition to the 'config' command will need this. As usual,
> >> the linker will throw it away if nothing actually uses it, so it
> >> should have no size impact when not used.
> >>
> >> Signed-off-by: Rasmus Villemoes <rv at rasmusvillemoes.dk>
> >>
> >> include/linux/string.h |  1 +
> >>  lib/string.c           | 27 +++++++++++++++++++++++++++
> >>  2 files changed, 28 insertions(+)
> >
> >> diff --git a/include/linux/string.h b/include/linux/string.h
> >> @@ -77,6 +77,7 @@ extern __kernel_size_t strlen(const char *);
> >>  #ifndef __HAVE_ARCH_STRNLEN
> >>  extern __kernel_size_t strnlen(const char *,__kernel_size_t);
> >>  #endif
> >> +char *strcasestr(const char *, const char *);
> >
> > I've been trying to add proper function docs to newly added ones, so
> > we can clearly see the behaviour. Despite these being well-known
> > function, they sometimes differ in how they handle edge-conditions.
> >
> > Also you could group this with the strstr()/strnstr() declarations a
> > few lines above, so it sits alongside its siblings.
> 
> Sure, I can move the declaration up. As for function docs, they exist,
> but in string.c, which is also where the docs for str[n]str is (an
> earlier patch had fixups for those). I see some kernel docs in
> string.h, and I dunno which is preferred, but most, including the
> sibling str[n]str ones, are in the .c file. So I'll leave it there.

The most consistent place for kernel-doc comments has been in the header
files, and not C files. So it would be another part of this series of
cleanups, or a follow-up, to make that all consistent and make something
for doc/api/

-- 
Tom
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