--- /dev/null
+#include <stdio.h>
+#include <string.h>
+#include "config.h"
+
+/**
+ * charset - character set conversion and validation routines
+ *
+ * This module provides a collection (well, only one, at the moment) of
+ * well-tested routines for dealing with character set nonsense.
+ *
+ * Validation functions:
+ * - bool utf8_validate(const char *str, size_t length);
+ *
+ * Example:
+ * #include <err.h>
+ * #include <stdio.h>
+ * #include <string.h>
+ * #include <ccan/charset/charset.h>
+ * #include <ccan/grab_file/grab_file.h>
+ * #include <ccan/talloc/talloc.h> // For talloc_free()
+ *
+ * int main(int argc, char *argv[])
+ * {
+ * size_t len;
+ * char *file;
+ * bool valid;
+ *
+ * if (argc != 2)
+ * err(1, "Expected exactly one argument");
+ *
+ * file = grab_file(NULL, argv[1], &len);
+ * if (!file)
+ * err(1, "Could not read file %s", argv[1]);
+ *
+ * valid = utf8_validate(file, len));
+ * printf("File contents are %s UTF-8\n", valid ? "valid" : "invalid");
+ *
+ * talloc_free(file);
+ *
+ * return 0;
+ * }
+ *
+ * Author: Joey Adams
+ * Licence: MIT
+ */
+int main(int argc, char *argv[])
+{
+ /* Expect exactly one argument */
+ if (argc != 2)
+ return 1;
+
+ if (strcmp(argv[1], "depends") == 0) {
+ /* Nothing */
+ return 0;
+ }
+
+ if (strcmp(argv[1], "libs") == 0) {
+ printf("m\n"); /* Needed for the pow() invocation in run.c */
+ return 0;
+ }
+
+ return 1;
+}