Import of the watch repository from Pebble

platform/tintin/boot/src/util/misc.c

@@ -0,0 +1,46 @@
+/*
+ * 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 "misc.h"
+
+#include "drivers/dbgserial.h"
+
+#include <stdint.h>
+
+void itoa(uint32_t num, char *buffer, int buffer_length) {
+  if (buffer_length < 11) {
+    dbgserial_putstr("itoa buffer too small");
+    return;
+  }
+  *buffer++ = '0';
+  *buffer++ = 'x';
+
+  for (int i = 7; i >= 0; --i) {
+    uint32_t digit = (num & (0xf << (i * 4))) >> (i * 4);
+
+    char c;
+    if (digit < 0xa) {
+      c = '0' + digit;
+    } else if (digit < 0x10) {
+      c = 'a' + (digit - 0xa);
+    } else {
+      c = ' ';
+    }
+
+    *buffer++ = c;
+  }
+  *buffer = '\0';
+}