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diff --git a/utils.h b/utils.h
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+/*
+ * nanobbs, a tiny forums software.
+ * Copyright (C) 2025-2026  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef UTILS_H
+#define UTILS_H
+
+#include <time.h>
+
+char *astrftime(const char *fmt, const struct tm *tm);
+int getul(const char **s, unsigned long *out);
+int getul_n(const char *s, unsigned long *out);
+char *sanitize(const char *s);
+char *gencookie(const char *name, const char *key);
+
+#endif