+/*
+ * Allows one or both pointers to be NULL
+ */
+bool bstrcmp(const char *s1, const char *s2)
+{
+ if (s1 == s2) return true;
+ if (s1 == NULL || s2 == NULL) return false;
+ return strcmp(s1, s2) == 0;
+}
+
+/*
+ * Get character length of UTF-8 string
+ *
+ * Valid UTF-8 codes
+ * U-00000000 - U-0000007F: 0xxxxxxx
+ * U-00000080 - U-000007FF: 110xxxxx 10xxxxxx
+ * U-00000800 - U-0000FFFF: 1110xxxx 10xxxxxx 10xxxxxx
+ * U-00010000 - U-001FFFFF: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
+ * U-00200000 - U-03FFFFFF: 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
+ * U-04000000 - U-7FFFFFFF: 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
+ */
+int cstrlen(const char *str)
+{
+ uint8_t *p = (uint8_t *)str;
+ int len = 0;
+ while (*p) {
+ if ((*p & 0xC0) != 0xC0) {
+ p++;
+ len++;
+ continue;
+ }
+ if ((*p & 0xD0) == 0xC0) {
+ p += 2;
+ len++;
+ continue;
+ }
+ if ((*p & 0xF0) == 0xD0) {
+ p += 3;
+ len++;
+ continue;
+ }
+ if ((*p & 0xF8) == 0xF0) {
+ p += 4;
+ len++;
+ continue;
+ }
+ if ((*p & 0xFC) == 0xF8) {
+ p += 5;
+ len++;
+ continue;
+ }
+ if ((*p & 0xFE) == 0xFC) {
+ p += 6;
+ len++;
+ continue;
+ }
+ p++; /* Shouln't get here but must advance */
+ }
+ return len;
+}
+