Add new API mrb_ptr_as_string().

include/mruby/string.h

@@ -43,6 +43,7 @@ void mrb_str_decref(mrb_state*, mrb_shared_string*);
 mrb_value mrb_str_literal(mrb_state*, mrb_value);
 void mrb_str_concat(mrb_state*, mrb_value, mrb_value);
 mrb_value mrb_str_plus(mrb_state*, mrb_value, mrb_value);
+mrb_value mrb_ptr_as_string(mrb_state *, void *);
 mrb_value mrb_obj_as_string(mrb_state *mrb, mrb_value obj);
 mrb_value mrb_str_resize(mrb_state *mrb, mrb_value str, int len); /* mrb_str_resize */
 mrb_value mrb_string_value(mrb_state *mrb, mrb_value *ptr); /* StringValue */

src/string.c

@@ -1534,6 +1534,36 @@ mrb_obj_as_string(mrb_state *mrb, mrb_value obj)
   return str;
 }
 
+mrb_value
+mrb_ptr_as_string(mrb_state *mrb, void *p)
+{
+  struct RString *p_str;
+  char *p1;
+  char *p2;
+  intptr_t n = (intptr_t)p;
+
+  p_str = str_new(mrb, NULL, 2 + sizeof(uintptr_t) * CHAR_BIT / 4);
+  p1 = p_str->ptr;
+  *p1++ = '0';
+  *p1++ = 'x';
+  p2 = p1;
+
+  do {
+    *p2++ = mrb_digitmap[n % 16];
+    n /= 16;
+  } while (n > 0);
+  *p2 = '\0';
+  p_str->len = (mrb_int)(p2 - p_str->ptr);
+
+  while (p1 < p2) {
+    const char  c = *p1;
+    *p1++ = *--p2;
+    *p2 = c;
+  }
+
+  return mrb_obj_value(p_str);
+}
+
 mrb_value
 mrb_check_string_type(mrb_state *mrb, mrb_value str)
 {