Expose a public SAVESTRLEN() macro

This seems to have been forgotten in the public API, perhaps because it
was added later.

Fixes #19165

Author: leonerd

pad.c

@@ -204,11 +204,11 @@ Perl_pad_new(pTHX_ int flags)
         SAVECOMPPAD();
         if (! (flags & padnew_CLONE)) {
             SAVESPTR(PL_comppad_name);
-            save_strlen((STRLEN *)&PL_padix);
-            save_strlen((STRLEN *)&PL_constpadix);
-            save_strlen((STRLEN *)&PL_comppad_name_fill);
-            save_strlen((STRLEN *)&PL_min_intro_pending);
-            save_strlen((STRLEN *)&PL_max_intro_pending);
+            SAVESTRLEN(PL_padix);
+            SAVESTRLEN(PL_constpadix);
+            SAVESTRLEN(PL_comppad_name_fill);
+            SAVESTRLEN(PL_min_intro_pending);
+            SAVESTRLEN(PL_max_intro_pending);
             SAVEBOOL(PL_cv_has_eval);
             if (flags & padnew_SAVESUB) {
                 SAVEBOOL(PL_pad_reset_pending);
@@ -1402,17 +1402,17 @@ void
 Perl_pad_block_start(pTHX_ int full)
 {
     ASSERT_CURPAD_ACTIVE("pad_block_start");
-    save_strlen((STRLEN *)&PL_comppad_name_floor);
+    SAVESTRLEN(PL_comppad_name_floor);
     PL_comppad_name_floor = PadnamelistMAX(PL_comppad_name);
     if (full)
         PL_comppad_name_fill = PL_comppad_name_floor;
     if (PL_comppad_name_floor < 0)
         PL_comppad_name_floor = 0;
-    save_strlen((STRLEN *)&PL_min_intro_pending);
-    save_strlen((STRLEN *)&PL_max_intro_pending);
+    SAVESTRLEN(PL_min_intro_pending);
+    SAVESTRLEN(PL_max_intro_pending);
     PL_min_intro_pending = 0;
-    save_strlen((STRLEN *)&PL_comppad_name_fill);
-    save_strlen((STRLEN *)&PL_padix_floor);
+    SAVESTRLEN(PL_comppad_name_fill);
+    SAVESTRLEN(PL_padix_floor);
     /* PL_padix_floor is what PL_padix is reset to at the start of each
        statement, by pad_reset().  We set it when entering a new scope
        to keep things like this working:

pod/perlguts.pod

@@ -1732,6 +1732,8 @@ Inside such a I<pseudo-block> the following service is available:
 
 =item C<SAVEBOOL(int i)>
 
+=item C<SAVESTRLEN(STRLEN i)>
+
 These macros arrange things to restore the value of integer variable
 C<i> at the end of the enclosing I<pseudo-block>.
 
@@ -1743,6 +1745,7 @@ C<i> at the end of the enclosing I<pseudo-block>.
 =for apidoc Amh||SAVEI8|I8 i
 =for apidoc Amh||SAVEI16|I16 i
 =for apidoc Amh||SAVEBOOL|bool i
+=for apidoc Amh||SAVESTRLEN|STRLEN i
 
 =item C<SAVESPTR(s)>
 

scope.h

@@ -226,28 +226,30 @@ scope has the given name. C<name> must be a literal string.
         if (PL_savestack_ix > old) leave_scope(old); \
     } STMT_END
 
-#define SAVEI8(i)	save_I8((I8*)&(i))
-#define SAVEI16(i)	save_I16((I16*)&(i))
-#define SAVEI32(i)	save_I32((I32*)&(i))
-#define SAVEINT(i)	save_int((int*)&(i))
-#define SAVEIV(i)	save_iv((IV*)&(i))
-#define SAVELONG(l)	save_long((long*)&(l))
-#define SAVEBOOL(b)	save_bool(&(b))
-#define SAVESPTR(s)	save_sptr((SV**)&(s))
-#define SAVEPPTR(s)	save_pptr((char**)&(s))
-#define SAVEVPTR(s)	save_vptr((void*)&(s))
-#define SAVEPADSVANDMORTALIZE(s)	save_padsv_and_mortalize(s)
-#define SAVEFREESV(s)	save_freesv(MUTABLE_SV(s))
-#define SAVEFREEPADNAME(s) save_pushptr((void *)(s), SAVEt_FREEPADNAME)
-#define SAVEMORTALIZESV(s)	save_mortalizesv(MUTABLE_SV(s))
-#define SAVEFREEOP(o)	save_freeop((OP*)(o))
-#define SAVEFREEPV(p)	save_freepv((char*)(p))
-#define SAVECLEARSV(sv)	save_clearsv((SV**)&(sv))
-#define SAVEGENERICSV(s)	save_generic_svref((SV**)&(s))
-#define SAVEGENERICPV(s)	save_generic_pvref((char**)&(s))
-#define SAVESHAREDPV(s)		save_shared_pvref((char**)&(s))
-#define SAVESETSVFLAGS(sv,mask,val)	save_set_svflags(sv,mask,val)
-#define SAVEFREECOPHH(h)	save_pushptr((void *)(h), SAVEt_FREECOPHH)
+#define SAVEI8(i)                   save_I8((I8*)&(i))
+#define SAVEI16(i)                  save_I16((I16*)&(i))
+#define SAVEI32(i)                  save_I32((I32*)&(i))
+#define SAVEINT(i)                  save_int((int*)&(i))
+#define SAVEIV(i)                   save_iv((IV*)&(i))
+#define SAVELONG(l)                 save_long((long*)&(l))
+#define SAVESTRLEN(l)               Perl_save_strlen(aTHX_ (STRLEN*)&(l))
+#define SAVEBOOL(b)                 save_bool(&(b))
+#define SAVESPTR(s)                 save_sptr((SV**)&(s))
+#define SAVEPPTR(s)                 save_pptr((char**)&(s))
+#define SAVEVPTR(s)                 save_vptr((void*)&(s))
+#define SAVEPADSVANDMORTALIZE(s)    save_padsv_and_mortalize(s)
+#define SAVEFREESV(s)               save_freesv(MUTABLE_SV(s))
+#define SAVEFREEPADNAME(s)          save_pushptr((void *)(s), SAVEt_FREEPADNAME)
+#define SAVEMORTALIZESV(s)          save_mortalizesv(MUTABLE_SV(s))
+#define SAVEFREEOP(o)               save_freeop((OP*)(o))
+#define SAVEFREEPV(p)               save_freepv((char*)(p))
+#define SAVECLEARSV(sv)             save_clearsv((SV**)&(sv))
+#define SAVEGENERICSV(s)            save_generic_svref((SV**)&(s))
+#define SAVEGENERICPV(s)            save_generic_pvref((char**)&(s))
+#define SAVESHAREDPV(s)             save_shared_pvref((char**)&(s))
+#define SAVESETSVFLAGS(sv,mask,val) save_set_svflags(sv,mask,val)
+#define SAVEFREECOPHH(h)            save_pushptr((void *)(h), SAVEt_FREECOPHH)
+
 #define SAVEDELETE(h,k,l) \
           save_delete(MUTABLE_HV(h), (char*)(k), (I32)(l))
 #define SAVEHDELETE(h,s) \