diff -r f51eec4e7ccb -r 943bf9d7c6d6 src/filesystem.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/filesystem.c	Sat Apr 19 15:06:24 2025 +0200
@@ -0,0 +1,54 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ * Copyright 2025 Mike Becker. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "ascension/filesystem.h"
+
+bool asc_filesystem_is_absolute(cxstring path) {
+#ifdef _WIN32
+#error "Windows currently not supported."
+#else
+    return path.length > 0 && path.ptr[0] == '/';
+#endif
+}
+
+
+cxmutstr asc_filesystem_combine_paths(cxstring base, cxstring path) {
+    if (asc_filesystem_is_absolute(path)) {
+        return cx_strdup(path);
+    }
+    if (base.length == 0) {
+        return cx_strdup(path);
+    }
+
+    if (base.ptr[base.length - 1] == '/') base.length--;
+
+    if (cx_strprefix(path, CX_STR("./"))) {
+        path = cx_strsubs(path, 2);
+    }
+
+    return cx_strcat(3, base, CX_STR("/"), path);
+}