+ * Update the raw buffer.
+ */
+
+static int
+yaml_parser_update_raw_buffer(yaml_parser_t *parser)
+{
+ size_t size_read = 0;
+
+ /* Return if the raw buffer is full. */
+
+ if (parser->raw_buffer.start == parser->raw_buffer.pointer
+ && parser->raw_buffer.last == parser->raw_buffer.end)
+ return 1;
+
+ /* Return on EOF. */
+
+ if (parser->eof) return 1;
+
+ /* Move the remaining bytes in the raw buffer to the beginning. */
+
+ if (parser->raw_buffer.start < parser->raw_buffer.pointer
+ && parser->raw_buffer.pointer < parser->raw_buffer.last) {
+ memmove(parser->raw_buffer.start, parser->raw_buffer.pointer,
+ parser->raw_buffer.last - parser->raw_buffer.pointer);
+ }
+ parser->raw_buffer.last -=
+ parser->raw_buffer.pointer - parser->raw_buffer.start;
+ parser->raw_buffer.pointer = parser->raw_buffer.start;
+
+ /* Call the read handler to fill the buffer. */
+
+ if (!parser->read_handler(parser->read_handler_data, parser->raw_buffer.last,
+ parser->raw_buffer.end - parser->raw_buffer.last, &size_read)) {
+ return yaml_parser_set_reader_error(parser, "Input error",
+ parser->offset, -1);
+ }
+ parser->raw_buffer.last += size_read;
+ if (!size_read) {
+ parser->eof = 1;
+ }
+
+ return 1;
+}
+
+/*
+ * Ensure that the buffer contains at least `length` characters.