Makemake crakecrake

1 files changed, 60 insertions, 0 deletions

diff --git a/src/mkfs.c b/src/mkfs.c
new file mode 100644
index 0000000..5d539d0
--- /dev/null
+++ b/src/mkfs.c
@@ -0,0 +1,60 @@
+/**
+ * Copyright (c) 2021, Marvin Borner <melvix@marvinborner.de>
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <spec.h>
+
+#include <assert.h>
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+	// Verify that spec is correct
+	assert(sizeof(struct marfs_header) == MARFS_ENTRY_SIZE);
+	assert(sizeof(struct marfs_dir_entry) == MARFS_ENTRY_SIZE);
+	assert(sizeof(struct marfs_file_entry) == MARFS_ENTRY_SIZE);
+
+	if (argc < 2) {
+		fprintf(stderr, "%s: error: no image specified\n", argv[0]);
+		return 1;
+	}
+
+	FILE *image = fopen(argv[1], "r+");
+	if (!image) {
+		fprintf(stderr, "%s: error: no valid image specified\n", argv[0]);
+		return 1;
+	}
+
+	struct marfs_header header = {
+		.magic = MARFS_MAGIC,
+		.version = MARFS_SPEC_VERSION,
+		.entry_size = MARFS_ENTRY_SIZE,
+		.main = MARFS_POINT(1, 1),
+		.padding = { 0 },
+	};
+
+	fseek(image, 0, SEEK_SET);
+	size_t write = fwrite(&header, 1, sizeof(header), image);
+	if (write != sizeof(header))
+		fprintf(stderr, "%s: error: header write failed: %lu bytes written\n", argv[0],
+			write);
+
+	struct marfs_dir_entry main = {
+		.header.type = MARFS_DIR_ENTRY,
+		.header.prev = MARFS_END,
+		.header.next = MARFS_END,
+	};
+	main.entries[0].name[0] = 0;
+
+	write = fwrite(&main, 1, sizeof(main), image);
+	if (write != sizeof(main))
+		fprintf(stderr, "%s: error: main directory write failed: %lu bytes written\n",
+			argv[0], write);
+
+	fflush(image);
+	fclose(image);
+
+	printf("MarFS format successful\n");
+	return 0;
+}