In Perl_sv_usepvn_flags, assert() that the caller has RTFM.

p4raw-id: //depot/perl@27842

diff --git a/sv.c b/sv.c
index 247ab31..308ecf8 100644 (file)
--- a/sv.c
+++ b/sv.c
@@ -3920,6 +3920,9 @@ Perl_sv_usepvn_flags(pTHX_ SV *sv, char *ptr, STRLEN len, U32 flags)
     if (SvPVX_const(sv))
        SvPV_free(sv);
 
+    if (flags & SV_HAS_TRAILING_NUL)
+       assert(ptr[len] == '\0');
+
     allocate = (flags & SV_HAS_TRAILING_NUL)
        ? len : PERL_STRLEN_ROUNDUP(len + 1);
 #ifdef DEBUGGING