unix/modffi: Support passing float/double args.

Author: dpgeorge

tests/unix/ffi_float.py

@@ -24,3 +24,11 @@ def ffi_open(names):
 
 strtod = libc.func("d", "strtod", "sp")
 print('%.6f' % strtod('1.23', None))
+
+# test passing double and float args
+libm = ffi_open(('libm.so', 'libc.so.0', 'libc.so.6', 'libc.dylib'))
+tgamma = libm.func('d', 'tgamma', 'd')
+tgammaf = libm.func('f', 'tgammaf', 'f')
+for fun in (tgamma, tgammaf):
+ for val in (0.5, 1, 1.0, 1.5, 4, 4.0):
+ print('%.6f' % fun(val))

tests/unix/ffi_float.py.exp

@@ -1,2 +1,14 @@
 1.230000
 1.230000
+1.772454
+1.000000
+1.000000
+0.886227
+6.000000
+6.000000
+1.772454
+1.000000
+1.000000
+0.886227
+6.000000
+6.000000

unix/modffi.c

@@ -356,6 +356,14 @@ STATIC mp_obj_t ffifunc_call(mp_obj_t self_in, mp_uint_t n_args, mp_uint_t n_kw,
  mp_obj_t a = args[i];
  if (*argtype == 'O') {
  values[i] = (ffi_arg)a;
+ #if MICROPY_PY_BUILTINS_FLOAT
+ } else if (*argtype == 'f') {
+ float *p = (float*)&values[i];
+ *p = mp_obj_get_float(a);
+ } else if (*argtype == 'd') {
+ double *p = (double*)&values[i];
+ *p = mp_obj_get_float(a);
+ #endif
  } else if (a == mp_const_none) {
  values[i] = 0;
  } else if (MP_OBJ_IS_INT(a)) {