--- /dev/null
+#include <string.h>
+#include "config.h"
+
+/**
+ * rbuf - buffered I/O input primitive.
+ *
+ * This code is like stdio, only simpler and more transparent to the user.
+ *
+ * Author: Rusty Russell <rusty@rustcorp.com.au>
+ * License: BSD-MIT
+ *
+ * Example:
+ * #include <ccan/rbuf/rbuf.h>
+ * #include <ccan/err/err.h>
+ * #include <stdlib.h>
+ * #include <unistd.h>
+ *
+ * // Dumb demo program to replace ' ' with '*'.
+ * int main(int argc, char *argv[])
+ * {
+ * struct rbuf in;
+ * char *word;
+ *
+ * if (argv[1]) {
+ * if (!rbuf_open(&in, argv[1], NULL, 0))
+ * err(1, "Failed opening %s", argv[1]);
+ * } else
+ * rbuf_init(&in, STDIN_FILENO, NULL, 0);
+ *
+ * while ((word = rbuf_read_str(&in, ' ', realloc)) != NULL)
+ * printf("%s*", word);
+ *
+ * if (errno)
+ * err(1, "Reading %s", argv[1] ? argv[1] : "<stdin>");
+ *
+ * // Free the buffer, just because we can.
+ * free(in.buf);
+ * return 0;
+ * }
+ */
+int main(int argc, char *argv[])
+{
+ /* Expect exactly one argument */
+ if (argc != 2)
+ return 1;
+
+ if (strcmp(argv[1], "depends") == 0) {
+ return 0;
+ }
+
+ return 1;
+}