Rename STR_BUF_MIN_SIZE to MRB_STR_BUF_MIN_SIZE. Make it configurable.

include/mrbconf.h

@@ -46,6 +46,10 @@
 /* page size of memory pool */
 //#define POOL_PAGE_SIZE 16000
 
+/* initial minimum size for string buffer */
+//#define MRB_STR_BUF_MIN_SIZE 128
+
+
 /* -DDISABLE_XXXX to drop following features */
 //#define DISABLE_STDIO		/* use of stdio */
 

include/mruby/string.h

@@ -13,8 +13,6 @@ extern "C" {
 
 #define IS_EVSTR(p,e) ((p) < (e) && (*(p) == '$' || *(p) == '@' || *(p) == '{'))
 
-#define STR_BUF_MIN_SIZE 128
-
 extern const char mrb_digitmap[];
 
 typedef struct mrb_shared_string {

src/string.c

@@ -156,6 +156,10 @@ mrb_str_new_empty(mrb_state *mrb, mrb_value str)
   return mrb_obj_value(s);
 }
 
+#ifndef MRB_STR_BUF_MIN_SIZE
+# define MRB_STR_BUF_MIN_SIZE 128
+#endif
+
 mrb_value
 mrb_str_buf_new(mrb_state *mrb, int capa)
 {
@@ -163,8 +167,8 @@ mrb_str_buf_new(mrb_state *mrb, int capa)
 
   s = mrb_obj_alloc_string(mrb);
 
-  if (capa < STR_BUF_MIN_SIZE) {
-    capa = STR_BUF_MIN_SIZE;
+  if (capa < MRB_STR_BUF_MIN_SIZE) {
+    capa = MRB_STR_BUF_MIN_SIZE;
   }
   s->len = 0;
   s->aux.capa = capa;