src/string/wcsstr.c doesn't work

[Yves Bastide <ybastide@gmail.com>]

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Hi,

twoway_wcsstr doesn't (always) work with periodic needles. With the
attached example

haystack = L"playing play play play always";
needle = L"play play play";

mem0 = 9, ms = 3; thus, after a left-half mismatch on "playing", mem is 9 and
    for (k = ms + 1; k>mem && n[k - 1] == h[k - 1]; k--);
terminates immediately.

yves

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#include <wchar.h>
#include <assert.h>

int main(int argc, char* argv[])
{
        wchar_t const *haystack = L"playing play play play always";
        wchar_t const *needle = L"play play play";

        wchar_t * p = wcsstr(haystack, needle);

        assert(p);
        return 0;
}