py: Overhaul and simplify printf/pfenv mechanism.

Previous to this patch the printing mechanism was a bit of a tangled
mess.  This patch attempts to consolidate printing into one interface.

All (non-debug) printing now uses the mp_print* family of functions,
mainly mp_printf.  All these functions take an mp_print_t structure as
their first argument, and this structure defines the printing backend
through the "print_strn" function of said structure.

Printing from the uPy core can reach the platform-defined print code via
two paths: either through mp_sys_stdout_obj (defined pert port) in
conjunction with mp_stream_write; or through the mp_plat_print structure
which uses the MP_PLAT_PRINT_STRN macro to define how string are printed
on the platform.  The former is only used when MICROPY_PY_IO is defined.

With this new scheme printing is generally more efficient (less layers
to go through, less arguments to pass), and, given an mp_print_t*
structure, one can call mp_print_str for efficiency instead of
mp_printf("%s", ...).  Code size is also reduced by around 200 bytes on
Thumb2 archs.

1 files changed, 9 insertions, 9 deletions

diff --git a/py/objarray.c b/py/objarray.c
index cb2b2b6a1..33cd7ecc3 100644
--- a/py/objarray.c
+++ b/py/objarray.c
@@ -76,26 +76,26 @@ STATIC mp_int_t array_get_buffer(mp_obj_t o_in, mp_buffer_info_t *bufinfo, mp_ui
 // array
 
 #if MICROPY_PY_BUILTINS_BYTEARRAY || MICROPY_PY_ARRAY
-STATIC void array_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in, mp_print_kind_t kind) {
+STATIC void array_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {
     (void)kind;
     mp_obj_array_t *o = o_in;
     if (o->typecode == BYTEARRAY_TYPECODE) {
-        print(env, "bytearray(b");
-        mp_str_print_quoted(print, env, o->items, o->len, true);
+        mp_print_str(print, "bytearray(b");
+        mp_str_print_quoted(print, o->items, o->len, true);
     } else {
-        print(env, "array('%c'", o->typecode);
+        mp_printf(print, "array('%c'", o->typecode);
         if (o->len > 0) {
-            print(env, ", [");
+            mp_print_str(print, ", [");
             for (mp_uint_t i = 0; i < o->len; i++) {
                 if (i > 0) {
-                    print(env, ", ");
+                    mp_print_str(print, ", ");
                 }
-                mp_obj_print_helper(print, env, mp_binary_get_val_array(o->typecode, o->items, i), PRINT_REPR);
+                mp_obj_print_helper(print, mp_binary_get_val_array(o->typecode, o->items, i), PRINT_REPR);
             }
-            print(env, "]");
+            mp_print_str(print, "]");
         }
     }
-    print(env, ")");
+    mp_print_str(print, ")");
 }
 #endif