Fix an offset of 1 with len magic on scalars

[perl/modules/Variable-Magic.git] / Magic.xs

diff --git a/Magic.xs b/Magic.xs
index 49ba4719ee5efea79f8a8613fb30a23b86b06a08..38b27dbee18890849f5da63dbe8c02eee4daba76 100644 (file)
--- a/Magic.xs
+++ b/Magic.xs
@@ -121,10 +121,12 @@ STATIC SV *vmg_clone(pTHX_ SV *sv, tTHX owner) {
 #endif
 
 /* Applied to dev-5.9 as 25854, integrated to maint-5.8 as 28160 */
-#if !defined(VMG_COMPAT_ARRAY_PUSH_NOLEN) && (VMG_HAS_PERL_MAINT(5, 8, 9, 28160) || VMG_HAS_PERL_MAINT(5, 9, 3, 25854) || VMG_HAS_PERL(5, 10, 0))
-# define VMG_COMPAT_ARRAY_PUSH_NOLEN 1
-#else
-# define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
+#ifndef VMG_COMPAT_ARRAY_PUSH_NOLEN
+# if VMG_HAS_PERL_MAINT(5, 8, 9, 28160) || VMG_HAS_PERL_MAINT(5, 9, 3, 25854) || VMG_HAS_PERL(5, 10, 0)
+#  define VMG_COMPAT_ARRAY_PUSH_NOLEN 1
+# else
+#  define VMG_COMPAT_ARRAY_PUSH_NOLEN 0
+# endif
 #endif
 
 /* Applied to dev-5.11 as 34908 */
@@ -510,12 +512,14 @@ STATIC int vmg_svt_set(pTHX_ SV *sv, MAGIC *mg) {
 
 STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
  SV *svr;
- I32 len;
+ I32 len, has_array;
  U32 ret;
 
  dSP;
  int count;
 
+ has_array = SvTYPE(sv) == SVt_PVAV;
+
  ENTER;
  SAVETMPS;
 
@@ -523,11 +527,11 @@ STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
  EXTEND(SP, 3);
  PUSHs(sv_2mortal(newRV_inc(sv)));
  PUSHs(mg->mg_obj ? mg->mg_obj : &PL_sv_undef);
- if (SvTYPE(sv) == SVt_PVAV) {
+ if (has_array) {
   len = av_len((AV *) sv) + 1;
   mPUSHi(len);
  } else {
-  len = 1;
+  len = 0;
   PUSHs(&PL_sv_undef);
  }
  PUTBACK;
@@ -545,7 +549,7 @@ STATIC U32 vmg_svt_len(pTHX_ SV *sv, MAGIC *mg) {
  FREETMPS;
  LEAVE;
 
- return ret - 1;
+ return has_array ? ret - 1 : ret;
 }
 
 STATIC int vmg_svt_clear(pTHX_ SV *sv, MAGIC *mg) {