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diff --git a/parse.h b/parse.h
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+/****************************************************************************
+ * bfs                                                                      *
+ * Copyright (C) 2020 Tavian Barnes <tavianator@tavianator.com>             *
+ *                                                                          *
+ * Permission to use, copy, modify, and/or distribute this software for any *
+ * purpose with or without fee is hereby granted.                           *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF         *
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR  *
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES   *
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN    *
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF  *
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.           *
+ ****************************************************************************/
+
+/**
+ * bfs command line parsing.
+ */
+
+#ifndef BFS_PARSE_H
+#define BFS_PARSE_H
+
+#include "ctx.h"
+
+/**
+ * Parse the command line.
+ *
+ * @param argc
+ *         The number of arguments.
+ * @param argv
+ *         The arguments to parse.
+ * @return
+ *         A new bfs context, or NULL on failure.
+ */
+struct bfs_ctx *bfs_parse_cmdline(int argc, char *argv[]);
+
+#endif // BFS_PARSE_H