+static
+char *remove_underscores_from_field_ref(const char *field_ref)
+{
+ const char *in_ch;
+ char *out_ch;
+ char *ret;
+ enum {
+ UNDERSCORE_REMOVE_STATE_REMOVE_NEXT_UNDERSCORE,
+ UNDERSCORE_REMOVE_STATE_DO_NOT_REMOVE_NEXT_UNDERSCORE,
+ } state = UNDERSCORE_REMOVE_STATE_REMOVE_NEXT_UNDERSCORE;
+
+ assert(field_ref);
+ ret = calloc(strlen(field_ref) + 1, 1);
+ if (!ret) {
+ BT_LOGE("Failed to allocate a string: size=%zu",
+ strlen(field_ref) + 1);
+ goto end;
+ }
+
+ in_ch = field_ref;
+ out_ch = ret;
+
+ while (*in_ch != '\0') {
+ switch (*in_ch) {
+ case ' ':
+ case '\t':
+ /* Remove whitespace */
+ in_ch++;
+ continue;
+ case '_':
+ if (state == UNDERSCORE_REMOVE_STATE_REMOVE_NEXT_UNDERSCORE) {
+ in_ch++;
+ state = UNDERSCORE_REMOVE_STATE_DO_NOT_REMOVE_NEXT_UNDERSCORE;
+ continue;
+ }
+
+ goto copy;
+ case '.':
+ state = UNDERSCORE_REMOVE_STATE_REMOVE_NEXT_UNDERSCORE;
+ goto copy;
+ default:
+ state = UNDERSCORE_REMOVE_STATE_DO_NOT_REMOVE_NEXT_UNDERSCORE;
+ goto copy;
+ }
+
+copy:
+ *out_ch = *in_ch;
+ in_ch++;
+ out_ch++;
+ }
+
+end:
+ return ret;
+}
+