Provide a new flag for sv_usepvn_flags, SV_HAS_TRAILING_NUL, which

signals that the buffer passed in is already well-formed for use as
SvPVX (i.e. it is followed by a trailing NUL), and hence the realloc()
to add a NUL can be skipped.

p4raw-id: //depot/perl@27841

1 files changed, 1 insertions, 0 deletions

diff --git a/sv.h b/sv.h
index e887497163..b6d4b14447 100644
--- a/sv.h
+++ b/sv.h
@@ -1637,6 +1637,7 @@ Like C<sv_catsv> but doesn't process magic.
 #define SV_CONST_RETURN		32
 #define SV_MUTABLE_RETURN	64
 #define SV_SMAGIC		128
+#define SV_HAS_TRAILING_NUL	256
 
 #define sv_unref(sv)    	sv_unref_flags(sv, 0)
 #define sv_force_normal(sv)	sv_force_normal_flags(sv, 0)