Move `mrb_str_pool` to `src/string.c` to use `str_init` family

src/state.c

@@ -141,58 +141,6 @@ mrb_irep_free(mrb_state *mrb, mrb_irep *irep)
   mrb_free(mrb, irep);
 }
 
-mrb_value
-mrb_str_pool(mrb_state *mrb, mrb_value str)
-{
-  struct RString *s = mrb_str_ptr(str);
-  struct RString *ns;
-  char *ptr;
-  mrb_int len;
-
-  ns = (struct RString *)mrb_malloc(mrb, sizeof(struct RString));
-  ns->tt = MRB_TT_STRING;
-  ns->c = mrb->string_class;
-
-  if (RSTR_NOFREE_P(s)) {
-    ns->flags = MRB_STR_NOFREE;
-    ns->as.heap.ptr = s->as.heap.ptr;
-    ns->as.heap.len = s->as.heap.len;
-    ns->as.heap.aux.capa = 0;
-  }
-  else {
-    ns->flags = 0;
-    if (RSTR_EMBED_P(s)) {
-      ptr = s->as.ary;
-      len = RSTR_EMBED_LEN(s);
-    }
-    else {
-      ptr = s->as.heap.ptr;
-      len = s->as.heap.len;
-    }
-
-    if (RSTR_EMBEDDABLE_P(len)) {
-      RSTR_SET_EMBED_FLAG(ns);
-      RSTR_SET_EMBED_LEN(ns, len);
-      if (ptr) {
-        memcpy(ns->as.ary, ptr, len);
-      }
-      ns->as.ary[len] = '\0';
-    }
-    else {
-      ns->as.heap.ptr = (char *)mrb_malloc(mrb, (size_t)len+1);
-      ns->as.heap.len = len;
-      ns->as.heap.aux.capa = len;
-      if (ptr) {
-        memcpy(ns->as.heap.ptr, ptr, len);
-      }
-      ns->as.heap.ptr[len] = '\0';
-    }
-  }
-  RSTR_SET_POOL_FLAG(ns);
-  MRB_SET_FROZEN_FLAG(ns);
-  return mrb_obj_value(ns);
-}
-
 void mrb_free_backtrace(mrb_state *mrb);
 
 MRB_API void

src/string.c

@@ -541,6 +541,29 @@ str_make_shared(mrb_state *mrb, struct RString *orig, struct RString *s)
   }
 }
 
+mrb_value
+mrb_str_pool(mrb_state *mrb, mrb_value str)
+{
+  struct RString *s = (struct RString *)mrb_malloc(mrb, sizeof(struct RString));
+  struct RString *orig = mrb_str_ptr(str);
+  const char *p = RSTR_PTR(orig);
+  size_t len = (size_t)RSTR_LEN(orig);
+
+  s->tt = MRB_TT_STRING;
+  s->c = mrb->string_class;
+  s->flags = 0;
+
+  if (RSTR_NOFREE_P(orig)) {
+    str_init_nofree(s, p, len);
+  }
+  else {
+    str_init(mrb, s, p, len);
+  }
+  RSTR_SET_POOL_FLAG(s);
+  MRB_SET_FROZEN_FLAG(s);
+  return mrb_obj_value(s);
+}
+
 mrb_value
 mrb_str_byte_subseq(mrb_state *mrb, mrb_value str, mrb_int beg, mrb_int len)
 {