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/**
* 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;
}
printf("Formatting %s...\n", argv[1]);
FILE *image = fopen(argv[1], "r+");
if (!image) {
fprintf(stderr, "%s: error: no valid image specified\n", argv[0]);
return 1;
}
fseek(image, 0, SEEK_END);
size_t size = ftell(image);
if (size < 2 * MARFS_ENTRY_SIZE) {
fprintf(stderr, "%s: error: too small image size: %luB but at least %dB needed\n",
argv[0], size, 2 * MARFS_ENTRY_SIZE);
return 1;
}
struct marfs_entry_header entry_header = { 0 };
for (u32 i = 0; i < size / MARFS_ENTRY_SIZE; i++) {
fseek(image, i * MARFS_ENTRY_SIZE, SEEK_SET);
assert(fwrite(&entry_header, 1, sizeof(entry_header), image) ==
sizeof(entry_header));
}
struct marfs_header header = {
.magic = MARFS_MAGIC,
.version = MARFS_SPEC_VERSION,
.entry_size = MARFS_ENTRY_SIZE,
.entry_count = 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_info info = {
.header.type = MARFS_DIR_ENTRY,
.header.id = 1,
.header.prev = MARFS_END,
.header.next = MARFS_END,
.count = 0,
};
write = fwrite(&info, 1, sizeof(info), image);
if (write != sizeof(info))
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;
}
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