Re-enable 'S' for --debug (sf_sanity checking for each call)

- Fixed also a wrong comment and a wrong argument to printf

dbug/dbug.c

@@ -128,7 +128,6 @@
 #define SANITY_CHECK_ON (1U << 12) /* Check memory on every DBUG_ENTER/RETURN */
 #define TRACE_ON        (1U << 31) /* Trace enabled. MUST be the highest bit!*/
 
-#define sf_sanity() (0)
 #define TRACING (cs->stack->flags & TRACE_ON)
 #define DEBUGGING (cs->stack->flags & DEBUG_ON)
 
@@ -272,6 +271,11 @@ static void PushState(CODE_STATE *cs);
 static void FreeState (CODE_STATE *cs, int free_state);
         /* Test for tracing enabled */
 static int DoTrace(CODE_STATE *cs);
+static int default_my_dbug_sanity(void);
+
+int (*dbug_sanity)(void)= default_my_dbug_sanity;
+
+
 /*
   return values of DoTrace.
   Can also be used as bitmask: ret & DO_TRACE
@@ -1121,7 +1125,7 @@ void _db_enter_(const char *_func_, const char *_file_,
     if (!TRACING) break;
     /* fall through */
   case DO_TRACE:
-    if ((cs->stack->flags & SANITY_CHECK_ON) && sf_sanity())
+    if ((cs->stack->flags & SANITY_CHECK_ON) && (*dbug_sanity)())
       cs->stack->flags &= ~SANITY_CHECK_ON;
     if (TRACING)
     {
@@ -1190,7 +1194,7 @@ void _db_return_(struct _db_stack_frame_ *_stack_frame_)
   if (DoTrace(cs) & DO_TRACE)
   {
     int org_cs_locked;
-    if ((cs->stack->flags & SANITY_CHECK_ON) && sf_sanity())
+    if ((cs->stack->flags & SANITY_CHECK_ON) && (*dbug_sanity)())
       cs->stack->flags &= ~SANITY_CHECK_ON;
     if (TRACING)
     {
@@ -2248,6 +2252,12 @@ const char* _db_get_func_(void)
   return cs->func;
 }
 
+
+static int default_my_dbug_sanity(void)
+{
+  return 0;
+}
+
 #else
 
 /*

include/my_dbug.h

@@ -63,6 +63,7 @@ extern void _db_flush_(void);
 extern void dbug_swap_code_state(void **code_state_store);
 extern void dbug_free_code_state(void **code_state_store);
 extern  const char* _db_get_func_(void);
+extern int (*dbug_sanity)(void);
 
 #define DBUG_LEAVE do { \
     _db_stack_frame_.line= __LINE__; \

include/my_sys.h

@@ -157,6 +157,7 @@ char *guess_malloc_library();
 /* If we have our own safemalloc (for debugging) */
 #if defined(SAFEMALLOC)
 void sf_report_leaked_memory(my_thread_id id);
+int sf_sanity();
 extern my_thread_id (*sf_malloc_dbug_id)(void);
 #define SAFEMALLOC_REPORT_MEMORY(X) sf_report_leaked_memory(X)
 #else

mysys/my_init.c

@@ -105,6 +105,10 @@ my_bool my_init(void)
   if (my_thread_global_init())
     return 1;
 
+#if defined(SAFEMALLOC) && !defined(DBUG_OFF)
+  dbug_sanity= sf_sanity;
+#endif
+
   /* $HOME is needed early to parse configuration files located in ~/ */
   if ((home_dir= getenv("HOME")) != 0)
     home_dir= intern_filename(home_dir_buff, home_dir);

mysys/my_malloc.c

@@ -200,8 +200,6 @@ void *my_realloc(void *oldpoint, size_t size, myf my_flags)
 /**
   Free memory allocated with my_malloc.
 
-  @remark Relies on free being able to handle a NULL argument.
-
   @param ptr Pointer to the memory allocated by my_malloc.
 */
 void my_free(void *ptr)

mysys/safemalloc.c

@@ -330,7 +330,7 @@ static int bad_ptr(const char *where, void *ptr)
       magicend[3] != MAGICEND3)
   {
     DBUG_PRINT("error",("Overrun buffer %p", ptr));
-    warn("Error: %s overrun buffer %p", where);
+    warn("Error: %s overrun buffer %p", where, ptr);
     fprintf(stderr, "Allocated at ");
     print_stack(irem->frame);
     return 1;
@@ -340,7 +340,7 @@ static int bad_ptr(const char *where, void *ptr)
 }
 
 /* check all allocated memory list for consistency */
-static int sf_sanity()
+int sf_sanity()
 {
   struct st_irem *irem;
   int flag= 0;