api changes of reader/parser

src/codegen.c

@@ -68,7 +68,7 @@ new_analyze_state(pic_state *pic)
   state->pic = pic;
   state->scope = NULL;
 
-  stdlib = pic_find_library(pic, pic_read(pic, "(scheme base)"));
+  stdlib = pic_find_library(pic, pic_read_cstr(pic, "(scheme base)"));
 
   /* native VM procedures */
   register_renamed_symbol(pic, state, rCONS, stdlib, "cons");

src/state.c

@@ -119,8 +119,8 @@ pic_open(int argc, char *argv[], char **envp)
   pic_init_core(pic);
 
   /* set library */
-  pic_make_library(pic, pic_read(pic, "(picrin user)"));
-  pic_in_library(pic, pic_read(pic, "(picrin user)"));
+  pic_make_library(pic, pic_read_cstr(pic, "(picrin user)"));
+  pic_in_library(pic, pic_read_cstr(pic, "(picrin user)"));
 
   return pic;
 }