diff -r 9dbfc0031887 -r 362b7659dc76 src/files.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/files.c	Wed Nov 08 23:17:07 2023 +0100
@@ -0,0 +1,64 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ * Copyright 2023 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/files.h"
+#include "ascension/error.h"
+
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+asc_file asc_file_mmap_rdonly(char const *filename) {
+    int fd = open(filename, O_RDONLY);
+    if (fd < 0) {
+        asc_dprintf("Failed to open file %s", filename);
+        return (cxstring) {NULL, 0};
+    }
+
+    struct stat statbuf;
+    int err = fstat(fd, &statbuf);
+    if (err < 0) {
+        close(fd);
+        asc_dprintf("Failed to stat file %s", filename);
+        return (cxstring) {NULL, 0};
+    }
+
+    char const *data = mmap(NULL, statbuf.st_size, PROT_READ, MAP_SHARED, fd, 0);
+    if (data == MAP_FAILED) {
+        close(fd);
+        asc_dprintf("Failed to map file %s into memory", filename);
+        return (cxstring) {NULL, 0};
+    }
+    close(fd);
+
+    return cx_strn(data, statbuf.st_size);
+}
+
+void asc_file_unmap(asc_file file) {
+    munmap((void *) file.ptr, file.length);
+}
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