Berry add `math.round` (#21602)

* Berry add `math.round`

* add unit tests

* math.roung() returns real

CHANGELOG.md

@@ -9,7 +9,8 @@ All notable changes to this project will be documented in this file.
 - Matter support for Air Quality sensors (#21559)
 - Matter support for bridged Air Quality (#21597)
 - HASPmota rounds to nearest int values passed as 'real' (#21599)
-- Berry automatic rounding of float to int when calling C mapped functions (#21601)
+- Berry automatic rounding of float to int when calling C mapped functions
+- Berry add `math.round`
 
 ### Breaking Changed
 

lib/libesp32/berry/src/be_mathlib.c

@@ -89,6 +89,17 @@ static int m_floor(bvm *vm)
     be_return(vm);
 }
 
+static int m_round(bvm *vm)
+{
+    if (be_top(vm) >= 1 && be_isnumber(vm, 1)) {
+        breal x = be_toreal(vm, 1);
+        be_pushreal(vm, mathfunc(round)(x));
+    } else {
+        be_pushreal(vm, (breal)0.0);
+    }
+    be_return(vm);
+}
+
 static int m_sin(bvm *vm)
 {
     if (be_top(vm) >= 1 && be_isnumber(vm, 1)) {
@@ -299,6 +310,7 @@ be_native_module_attr_table(math) {
     be_native_module_function("abs", m_abs),
     be_native_module_function("ceil", m_ceil),
     be_native_module_function("floor", m_floor),
+    be_native_module_function("round", m_round),
     be_native_module_function("sin", m_sin),
     be_native_module_function("cos", m_cos),
     be_native_module_function("tan", m_tan),
@@ -334,6 +346,7 @@ module math (scope: global, depend: BE_USE_MATH_MODULE) {
     abs, func(m_abs)
     ceil, func(m_ceil)
     floor, func(m_floor)
+    round, func(m_round)
     sin, func(m_sin)
     cos, func(m_cos)
     tan, func(m_tan)

lib/libesp32/berry/tests/math.be

@@ -44,3 +44,17 @@ m_inf2 = {"v": -math.inf}
 assert(json.dump(m_inf2) == '{"v":null}')
 m_v = {"v": 3.5}
 assert(json.dump(m_v) == '{"v":3.5}')
+
+# math.round
+assert(math.round(3) == 3)
+assert(math.round(3.2) == 3)
+assert(math.round(3.5) == 4)
+assert(math.round(3.6) == 4)
+
+assert(math.round(-3) == -3)
+assert(math.round(-3.2) == -3)
+assert(math.round(-3.5) == -4)
+assert(math.round(-3.6) == -4)
+
+assert(math.round() == 0)
+