py and libm: Add asinf,acosf; print higher precision for float.

Also use less stack space when printing single precision float.

Addition of asinf and acosf addresses issue #851.

2 files changed, 17 insertions, 11 deletions

diff --git a/py/objcomplex.c b/py/objcomplex.c
index 8e0f638c3e..2768a01e65 100644
--- a/py/objcomplex.c
+++ b/py/objcomplex.c
@@ -25,6 +25,7 @@
  */
 
 #include <stdlib.h>
+#include <stdio.h>
 #include <assert.h>
 
 #include "mpconfig.h"
@@ -55,21 +56,26 @@ mp_obj_t mp_obj_new_complex(mp_float_t real, mp_float_t imag);
 STATIC void complex_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in, mp_print_kind_t kind) {
     mp_obj_complex_t *o = o_in;
 #if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT
-    char buf[32];
+    char buf[16];
     if (o->real == 0) {
-        format_float(o->imag, buf, sizeof(buf), 'g', 6, '\0');
+        format_float(o->imag, buf, sizeof(buf), 'g', 7, '\0');
         print(env, "%sj", buf);
     } else {
-        format_float(o->real, buf, sizeof(buf), 'g', 6, '\0');
+        format_float(o->real, buf, sizeof(buf), 'g', 7, '\0');
         print(env, "(%s+", buf);
-        format_float(o->imag, buf, sizeof(buf), 'g', 6, '\0');
+        format_float(o->imag, buf, sizeof(buf), 'g', 7, '\0');
         print(env, "%sj)", buf);
     }
 #else
+    char buf[32];
     if (o->real == 0) {
-        print(env, "%.8gj",  (double) o->imag);
+        sprintf(buf, "%.16g", (double)o->imag);
+        print(env, "%sj", buf);
     } else {
-        print(env, "(%.8g+%.8gj)", (double) o->real, (double) o->imag);
+        sprintf(buf, "%.16g", (double)o->real);
+        print(env, "(%s+", buf);
+        sprintf(buf, "%.16g", (double)o->imag);
+        print(env, "%sj)", buf);
     }
 #endif
 }
diff --git a/py/objfloat.c b/py/objfloat.c
index 52d484135f..c6734ee780 100644
--- a/py/objfloat.c
+++ b/py/objfloat.c
@@ -48,18 +48,18 @@
 STATIC void float_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in, mp_print_kind_t kind) {
     mp_obj_float_t *o = o_in;
 #if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT
-    char buf[32];
-    format_float(o->value, buf, sizeof(buf), 'g', 6, '\0');
+    char buf[16];
+    format_float(o->value, buf, sizeof(buf), 'g', 7, '\0');
     print(env, "%s", buf);
-    if (strchr(buf, '.') == NULL) {
+    if (strchr(buf, '.') == NULL && strchr(buf, 'e') == NULL) {
         // Python floats always have decimal point
         print(env, ".0");
     }
 #else
     char buf[32];
-    sprintf(buf, "%.17g", (double) o->value);
+    sprintf(buf, "%.16g", (double) o->value);
     print(env, buf);
-    if (strchr(buf, '.') == NULL) {
+    if (strchr(buf, '.') == NULL && strchr(buf, 'e') == NULL) {
         // Python floats always have decimal point
         print(env, ".0");
     }