Import of the watch repository from Pebble

src/libc/math/floor.c

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+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+///////////////////////////////////////
+// Implements:
+//   double floor(double x);
+
+#include <pblibc_private.h>
+
+#include <math.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+// TODO: PBL-36144 replace this naive implementation with __builtin_floor()
+
+#ifndef NAN
+#define NAN         (0.0/0.0)
+#endif
+
+#ifndef INFINITY
+#define INFINITY    (1.0/0.0)
+#endif
+
+#ifndef isinf
+#define isinf(y) (__builtin_isinf(y))
+#endif
+
+#ifndef isnan
+#define isnan(y) (__builtin_isnan(y))
+#endif
+
+
+double floor(double x) {
+  if (isnan(x)) {
+    return NAN;
+  }
+  if (isinf(x)) {
+    return INFINITY;
+  }
+
+  const int64_t x_int = (int64_t)x;
+  const bool has_no_fraction = (double)x_int == x;
+  return (double)((x >= 0 || has_no_fraction) ? x_int : x_int - 1);
+}

src/libc/math/round.c

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+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Naive implementation, probably room for optimization...
+double round(double d) {
+  if (__builtin_floor(d) == d) {
+    return d;
+  }
+  double half;
+  if (d < 0.0) {
+    if (d > -0.5) {
+      return -0.0;
+    } else {
+      half = -0.5;
+    }
+  } else {
+    half = 0.5;
+  }
+  return __builtin_floor(d + half);
+}