feat+fix: add extern fns reading; fix VM reading issues

src/vm/fzl_vm_reader.c

@@ -8,7 +8,7 @@
 #include <vm/fzl_vm_reader.h>
 #include <vm/internals/reader.h>
 
-char reader_err[256];
+char reader_err[512];
 
 fzl_vm_reader_t *fzl_vm_mkreader(char *filepath)
 {
@@ -138,7 +138,12 @@ void fzl_vm_freereader(fzl_vm_reader_t *reader)
   }
 
   if (reader->extern_libs)
+  {
+    for (uint16_t i = 0; i < reader->extern_libs_count; i++)
+      free(reader->extern_libs[i]);
+
     free(reader->extern_libs);
+  }
 
   if (reader->extern_types)
   {
@@ -156,6 +161,8 @@ void fzl_vm_freereader(fzl_vm_reader_t *reader)
           if (fields[j].name)
             free(fields[j].name);
         }
+
+        free(fields);
       }
     }
 
@@ -163,7 +170,22 @@ void fzl_vm_freereader(fzl_vm_reader_t *reader)
   }
 
   if (reader->extern_fns)
+  {
+    for (uint16_t i = 0; i < reader->extern_fns_count; i++)
+    {
+      fzl_extern_fn_t *fn = &reader->extern_fns[i];
+      if (fn->used_name)
+        free(fn->used_name);
+
+      if (fn->symbol_name)
+        free(fn->symbol_name);
+
+      if (fn->args_count > 0)
+        free(fn->args);
+    }
+
     free(reader->extern_fns);
+  }
 
   if (reader->ops)
     free(reader->ops);