When probing strxfrm, consider a consistent return value of 0 as sane

diff --git a/locale.c b/locale.c
index 5893212..81c09ab 100644 (file)
--- a/locale.c
+++ b/locale.c
@@ -231,7 +231,7 @@ Perl_new_collate(pTHX_ const char *newcoll)
          const Size_t fa = strxfrm(xbuf, "a",  XFRMBUFSIZE);
          const Size_t fb = strxfrm(xbuf, "ab", XFRMBUFSIZE);
          const SSize_t mult = fb - fa;
-         if (mult < 1)
+         if (mult < 1 && !(fa == 0 && fb == 0))
              Perl_croak(aTHX_ "panic: strxfrm() gets absurd - a => %"UVuf", ab => %"UVuf,
                         (UV) fa, (UV) fb);
          PL_collxfrm_base = (fa > (Size_t)mult) ? (fa - mult) : 0;