Import of the watch repository from Pebble

src/libos/platform.c

@@ -0,0 +1,55 @@
+/*
+ * 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.
+ */
+
+#include "os/malloc.h"
+#include "os/assert.h"
+#include "util/attributes.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+// Below are some default implementations for system-specific functions required by libos.
+// These functions assume a working C standard library is linked into the program.
+// For programs where this isn't the case (e.g. the Pebble FW),
+// alternate implementations need to be provided.
+// The functions are defined as WEAK so they may be easily overridden.
+
+WEAK void os_log(const char *filename, int line, const char *string) {
+  printf("%s:%d %s\n", filename, line, string);
+}
+
+WEAK NORETURN os_assertion_failed(const char *filename, int line) {
+  os_log(filename, line, "*** OS ASSERT FAILED");
+  exit(EXIT_FAILURE);
+}
+
+WEAK NORETURN os_assertion_failed_lr(const char *filename, int line, uint32_t lr) {
+  os_assertion_failed(filename, line);
+}
+
+WEAK void *os_malloc(size_t size) {
+  return malloc(size);
+}
+
+WEAK void *os_malloc_check(size_t size) {
+  void *ptr = malloc(size);
+  OS_ASSERT(ptr);
+  return ptr;
+}
+
+WEAK void os_free(void *ptr) {
+  free(ptr);
+}