py: Change vstr so that it doesn't null terminate buffer by default.

This cleans up vstr so that it's a pure "variable buffer", and the user
can decide whether they need to add a terminating null byte.  In most
places where vstr is used, the vstr did not need to be null terminated
and so this patch saves code size, a tiny bit of RAM, and makes vstr
usage more efficient.  When null termination is needed it must be
done explicitly using vstr_null_terminate.

1 files changed, 3 insertions, 3 deletions

diff --git a/py/emitcpy.c b/py/emitcpy.c
index 924a5566d..09a0e006f 100644
--- a/py/emitcpy.c
+++ b/py/emitcpy.c
@@ -800,10 +800,10 @@ STATIC void emit_cpy_end_except_handler(emit_t *emit) {
     emit_cpy_adjust_stack_size(emit, -5); // stack adjust
 }
 
-STATIC void emit_cpy_load_const_verbatim_str(emit_t *emit, const char *str) {
+STATIC void emit_cpy_load_const_verbatim_strn(emit_t *emit, const char *str, mp_uint_t len) {
     emit_pre(emit, 1, 3);
     if (emit->pass == MP_PASS_EMIT) {
-        printf("LOAD_CONST %s\n", str);
+        printf("LOAD_CONST %.*s\n", (int)len, str);
     }
 }
 
@@ -912,7 +912,7 @@ const emit_method_table_t emit_cpython_method_table = {
     emit_cpy_end_except_handler,
 
     // emitcpy specific functions
-    emit_cpy_load_const_verbatim_str,
+    emit_cpy_load_const_verbatim_strn,
     emit_cpy_load_closure,
     emit_cpy_setup_loop,
 };