errno.c: use `MRB_SYM()` instead of `mrb_intern_lit()`.

mrbgems/mruby-errno/src/errno.c

@@ -8,6 +8,7 @@
 #include <errno.h>
 #include <stdio.h>
 #include <string.h>
+#include <mruby/presym.h>
 
 #if MRUBY_RELEASE_NO < 10000
 static struct RClass *
@@ -35,13 +36,13 @@ mrb_sce_init(mrb_state *mrb, mrb_value self)
     }
   }
   if (!no_errno) {
-    e2c = mrb_const_get(mrb, mrb_obj_value(mrb_module_get(mrb, "Errno")), mrb_intern_lit(mrb, "Errno2class"));
+    e2c = mrb_const_get(mrb, mrb_obj_value(mrb_module_get(mrb, "Errno")), MRB_SYM(Errno2class));
     c = mrb_hash_fetch(mrb, e2c, mrb_fixnum_value(n), mrb_nil_value());
     if (!mrb_nil_p(c)) {
       mrb_basic_ptr(self)->c = mrb_class_ptr(c);
       str = mrb_str_new_cstr(mrb, strerror(n));
     } else {
-      mrb_iv_set(mrb, self, mrb_intern_lit(mrb, "errno"), mrb_fixnum_value(n));
+      mrb_iv_set(mrb, self, MRB_SYM(errno), mrb_fixnum_value(n));
       str = mrb_str_new_cstr(mrb, "Unknown error: ");
       snprintf(buf, sizeof(buf), "%d", (int)n);
       mrb_str_cat2(mrb, str, buf);
@@ -53,7 +54,7 @@ mrb_sce_init(mrb_state *mrb, mrb_value self)
     mrb_str_cat2(mrb, str, " - ");
     mrb_str_append(mrb, str, m);
   }
-  mrb_iv_set(mrb, self, mrb_intern_lit(mrb, "mesg"), str);
+  mrb_iv_set(mrb, self, MRB_SYM(mesg), str);
   return self;
 }
 
@@ -64,7 +65,7 @@ mrb_sce_errno(mrb_state *mrb, mrb_value self)
   mrb_sym sym;
 
   c = mrb_class(mrb, self);
-  sym = mrb_intern_lit(mrb, "Errno");
+  sym = MRB_SYM(Errno);
 #if MRUBY_RELEASE_NO < 10000
   if (mrb_const_defined_at(mrb, c, sym)) {
 #else
@@ -72,7 +73,7 @@ mrb_sce_errno(mrb_state *mrb, mrb_value self)
 #endif
     return mrb_const_get(mrb, mrb_obj_value(c), sym);
   } else {
-    sym = mrb_intern_lit(mrb, "errno");
+    sym = MRB_SYM(errno);
     return mrb_attr_get(mrb, self, sym);
   }
 }
@@ -80,7 +81,7 @@ mrb_sce_errno(mrb_state *mrb, mrb_value self)
 static mrb_value
 mrb_sce_to_s(mrb_state *mrb, mrb_value self)
 {
-  return mrb_attr_get(mrb, self, mrb_intern_lit(mrb, "mesg"));
+  return mrb_attr_get(mrb, self, MRB_SYM(mesg));
 }
 
 static mrb_value
@@ -115,7 +116,7 @@ mrb_exxx_init(mrb_state *mrb, mrb_value self)
 {
   mrb_value m, no, str;
 
-  no = mrb_const_get(mrb, mrb_obj_value(mrb_class(mrb, self)), mrb_intern_lit(mrb, "Errno"));
+  no = mrb_const_get(mrb, mrb_obj_value(mrb_class(mrb, self)), MRB_SYM(Errno));
   str = mrb_str_new_cstr(mrb, strerror(mrb_fixnum(no)));
 
   m = mrb_nil_value();
@@ -124,7 +125,7 @@ mrb_exxx_init(mrb_state *mrb, mrb_value self)
     mrb_str_cat2(mrb, str, " - ");
     mrb_str_append(mrb, str, m);
   }
-  mrb_iv_set(mrb, self, mrb_intern_lit(mrb, "mesg"), str);
+  mrb_iv_set(mrb, self, MRB_SYM(mesg), str);
   return self;
 }