Use `struct` initializer instead of `memset`.

mrbgems/mruby-bin-debugger/tools/mrdb/apibreak.c

@@ -344,10 +344,10 @@ mrb_debug_delete_break(mrb_state *mrb, mrb_debug_context *dbg, uint32_t bpno)
 
   for(i = index ; i < dbg->bpnum; i++) {
     if ((i + 1) == dbg->bpnum) {
-      memset(&dbg->bp[i], 0, sizeof(mrb_debug_breakpoint));
+      dbg->bp[i] = (mrb_debug_breakpoint){0};
     }
     else {
-      memcpy(&dbg->bp[i], &dbg->bp[i + 1], sizeof(mrb_debug_breakpoint));
+      dbg->bp[i] = dbg->bp[i + 1];
     }
   }
 

mrbgems/mruby-bin-debugger/tools/mrdb/cmdmisc.c

@@ -141,7 +141,7 @@ static listcmd_parser_state*
 listcmd_parser_state_new(mrb_state *mrb)
 {
   listcmd_parser_state *st = (listcmd_parser_state*)mrb_malloc(mrb, sizeof(listcmd_parser_state));
-  memset(st, 0, sizeof(listcmd_parser_state));
+  *st = (listcmd_parser_state){0};
   return st;
 }
 

mrbgems/mruby-bin-debugger/tools/mrdb/mrdb.c

@@ -187,7 +187,7 @@ mrb_debug_context_new(mrb_state *mrb)
 {
   mrb_debug_context *dbg = (mrb_debug_context*)mrb_malloc(mrb, sizeof(mrb_debug_context));
 
-  memset(dbg, 0, sizeof(mrb_debug_context));
+  *dbg = (mrb_debug_context){0};
 
   dbg->xm = DBG_INIT;
   dbg->xphase = DBG_PHASE_BEFORE_RUN;
@@ -226,7 +226,7 @@ mrdb_state_new(mrb_state *mrb)
 {
   mrdb_state *mrdb = (mrdb_state*)mrb_malloc(mrb, sizeof(mrdb_state));
 
-  memset(mrdb, 0, sizeof(mrdb_state));
+  *mrdb = (mrdb_state){0};
 
   mrdb->dbg = mrb_debug_context_get(mrb);
   mrdb->command = (char*)mrb_malloc(mrb, MAX_COMMAND_LINE+1);

mrbgems/mruby-fiber/src/fiber.c

@@ -95,7 +95,6 @@ fiber_init(mrb_state *mrb, mrb_value self)
   c->stbase = (mrb_value *)mrb_malloc(mrb, slen*sizeof(mrb_value));
   c->stend = c->stbase + slen;
 
-#ifdef MRB_NAN_BOXING
   {
     mrb_value *p = c->stbase;
     mrb_value *pend = c->stend;
@@ -105,9 +104,6 @@ fiber_init(mrb_state *mrb, mrb_value self)
       p++;
     }
   }
-#else
-  memset(c->stbase, 0, slen * sizeof(mrb_value));
-#endif
 
   /* copy receiver from a block */
   c->stbase[0] = mrb->c->ci->stack[0];

mrbgems/mruby-io/src/file.c

@@ -88,7 +88,7 @@ flock(int fd, int operation) {
   DWORD flags;
   flags = ((operation & LOCK_NB) ? LOCKFILE_FAIL_IMMEDIATELY : 0)
           | ((operation & LOCK_SH) ? LOCKFILE_EXCLUSIVE_LOCK : 0);
-  memset(&ov, 0, sizeof(ov));
+  ov = (OVERLAPPED){0};
   return LockFileEx(h, flags, 0, 0xffffffff, 0xffffffff, &ov) ? 0 : -1;
 }
 #endif

mrbgems/mruby-socket/src/socket.c

@@ -67,7 +67,7 @@ static const char *inet_ntop(int af, const void *src, char *dst, socklen_t cnt)
   if (af == AF_INET)
   {
     struct sockaddr_in in;
-    memset(&in, 0, sizeof(in));
+    in = (struct sockaddr_in){0};
     in.sin_family = AF_INET;
     memcpy(&in.sin_addr, src, sizeof(struct in_addr));
     getnameinfo((struct sockaddr *)&in, sizeof(struct
@@ -77,7 +77,7 @@ static const char *inet_ntop(int af, const void *src, char *dst, socklen_t cnt)
   else if (af == AF_INET6)
   {
     struct sockaddr_in6 in;
-    memset(&in, 0, sizeof(in));
+    in = (struct sockaddr_in6){0};
     in.sin6_family = AF_INET6;
     memcpy(&in.sin6_addr, src, sizeof(struct in_addr6));
     getnameinfo((struct sockaddr *)&in, sizeof(struct
@@ -91,7 +91,7 @@ static int inet_pton(int af, const char *src, void *dst)
 {
   struct addrinfo hints, *res, *ressave;
 
-  memset(&hints, 0, sizeof(struct addrinfo));
+  hints = (struct addrinfo){0};
   hints.ai_family = af;
 
   if (getaddrinfo(src, NULL, &hints, &res) != 0)
@@ -148,7 +148,7 @@ mrb_addrinfo_getaddrinfo(mrb_state *mrb, mrb_value klass)
     mrb_raise(mrb, E_TYPE_ERROR, "service must be String, Integer, or nil");
   }
 
-  memset(&hints, 0, sizeof(hints));
+  hints = (struct addrinfo){0};
   hints.ai_flags = (int)flags;
 
   if (mrb_integer_p(family)) {

src/class.c

@@ -1698,7 +1698,9 @@ mrb_define_module_function(mrb_state *mrb, struct RClass *c, const char *name, m
 static void
 mc_clear(mrb_state *mrb)
 {
-  memset(mrb->cache, 0, MRB_METHOD_CACHE_SIZE*sizeof(mrb->cache[0]));
+  for (int i=0; i<MRB_METHOD_CACHE_SIZE; i++) {
+    mrb->cache[i] = (struct mrb_cache_entry){0};
+  }
 }
 
 void

src/vm.c

@@ -86,14 +86,10 @@ void mrb_method_missing(mrb_state *mrb, mrb_sym name, mrb_value self, mrb_value
 static inline void
 stack_clear(mrb_value *from, size_t count)
 {
-#ifdef MRB_NAN_BOXING
   while (count-- > 0) {
     SET_NIL_VALUE(*from);
     from++;
   }
-#else
-  memset(from, 0, sizeof(mrb_value)*count);
-#endif
 }
 
 static inline void