py: Make it so that printing a small int does not allocate heap memory.

With the implementation of proper string formatting, code to print a
small int was delegated to mpz_as_str_inpl (after first converting the
small int to an mpz using stack memory).  But mpz_as_str_inpl allocates
heap memory to do the conversion, so small ints needed heap memory just
to be printed.

This fix has a separate function to print small ints, which does not
allocate heap, and allocates less stack.

String formatting, printf and pfenv are now large beasts, with some
semi-duplicated code.

1 files changed, 2 insertions, 0 deletions

diff --git a/py/objint.h b/py/objint.h
index 7ee476269..5b21d55fe 100644
--- a/py/objint.h
+++ b/py/objint.h
@@ -10,6 +10,8 @@ typedef struct _mp_obj_int_t {
 void mp_obj_int_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind);
 char *mp_obj_int_formatted(char **buf, int *buf_size, int *fmt_size, mp_obj_t self_in,
                            int base, const char *prefix, char base_char, char comma);
+char *mp_obj_int_formatted_impl(char **buf, int *buf_size, int *fmt_size, mp_obj_t self_in,
+                                int base, const char *prefix, char base_char, char comma);
 bool mp_obj_int_is_positive(mp_obj_t self_in);
 mp_obj_t mp_obj_int_unary_op(int op, mp_obj_t o_in);
 mp_obj_t mp_obj_int_binary_op(int op, mp_obj_t lhs_in, mp_obj_t rhs_in);