[[case]] # simple file seek
define = [
    {COUNT=132, SKIP=4},
    {COUNT=132, SKIP=128},
    {COUNT=200, SKIP=10},
    {COUNT=200, SKIP=100},
    {COUNT=4,   SKIP=1},
    {COUNT=4,   SKIP=2},
]
code = '''
    lfs2_format(&lfs2, &cfg) => 0;
    lfs2_mount(&lfs2, &cfg) => 0;
    lfs2_file_open(&lfs2, &file, "kitty",
            LFS2_O_WRONLY | LFS2_O_CREAT | LFS2_O_APPEND) => 0;
    size = strlen("kittycatcat");
    memcpy(buffer, "kittycatcat", size);
    for (int j = 0; j < COUNT; j++) {
        lfs2_file_write(&lfs2, &file, buffer, size);
    }
    lfs2_file_close(&lfs2, &file) => 0;
    lfs2_unmount(&lfs2) => 0;

    lfs2_mount(&lfs2, &cfg) => 0;
    lfs2_file_open(&lfs2, &file, "kitty", LFS2_O_RDONLY) => 0;

    lfs2_soff_t pos = -1;
    size = strlen("kittycatcat");
    for (int i = 0; i < SKIP; i++) {
        lfs2_file_read(&lfs2, &file, buffer, size) => size;
        memcmp(buffer, "kittycatcat", size) => 0;
        pos = lfs2_file_tell(&lfs2, &file);
    }
    assert(pos >= 0);

    lfs2_file_seek(&lfs2, &file, pos, LFS2_SEEK_SET) => pos;
    lfs2_file_read(&lfs2, &file, buffer, size) => size;
    memcmp(buffer, "kittycatcat", size) => 0;

    lfs2_file_rewind(&lfs2, &file) => 0;
    lfs2_file_read(&lfs2, &file, buffer, size) => size;
    memcmp(buffer, "kittycatcat", size) => 0;

    lfs2_file_seek(&lfs2, &file, 0, LFS2_SEEK_CUR) => size;
    lfs2_file_read(&lfs2, &file, buffer, size) => size;
    memcmp(buffer, "kittycatcat", size) => 0;

    lfs2_file_seek(&lfs2, &file, size, LFS2_SEEK_CUR) => 3*size;
    lfs2_file_read(&lfs2, &file, buffer, size) => size;
    memcmp(buffer, "kittycatcat", size) => 0;

    lfs2_file_seek(&lfs2, &file, pos, LFS2_SEEK_SET) => pos;
    lfs2_file_read(&lfs2, &file, buffer, size) => size;
    memcmp(buffer, "kittycatcat", size) => 0;

    lfs2_file_seek(&lfs2, &file, -size, LFS2_SEEK_CUR) => pos;
    lfs2_file_read(&lfs2, &file, buffer, size) => size;
    memcmp(buffer, "kittycatcat", size) => 0;

    lfs2_file_seek(&lfs2, &file, -size, LFS2_SEEK_END) >= 0 => 1;
    lfs2_file_read(&lfs2, &file, buffer, size) => size;
    memcmp(buffer, "kittycatcat", size) => 0;

    size = lfs2_file_size(&lfs2, &file);
    lfs2_file_seek(&lfs2, &file, 0, LFS2_SEEK_CUR) => size;

    lfs2_file_close(&lfs2, &file) => 0;
    lfs2_unmount(&lfs2) => 0;
'''

[[case]] # simple file seek and write
define = [
    {COUNT=132, SKIP=4},
    {COUNT=132, SKIP=128},
    {COUNT=200, SKIP=10},
    {COUNT=200, SKIP=100},
    {COUNT=4,   SKIP=1},
    {COUNT=4,   SKIP=2},
]
code = '''
    lfs2_format(&lfs2, &cfg) => 0;
    lfs2_mount(&lfs2, &cfg) => 0;
    lfs2_file_open(&lfs2, &file, "kitty",
            LFS2_O_WRONLY | LFS2_O_CREAT | LFS2_O_APPEND) => 0;
    size = strlen("kittycatcat");
    memcpy(buffer, "kittycatcat", size);
    for (int j = 0; j < COUNT; j++) {
        lfs2_file_write(&lfs2, &file, buffer, size);
    }
    lfs2_file_close(&lfs2, &file) => 0;
    lfs2_unmount(&lfs2) => 0;

    lfs2_mount(&lfs2, &cfg) => 0;
    lfs2_file_open(&lfs2, &file, "kitty", LFS2_O_RDWR) => 0;

    lfs2_soff_t pos = -1;
    size = strlen("kittycatcat");
    for (int i = 0; i < SKIP; i++) {
        lfs2_file_read(&lfs2, &file, buffer, size) => size;
        memcmp(buffer, "kittycatcat", size) => 0;
        pos = lfs2_file_tell(&lfs2, &file);
    }
    assert(pos >= 0);

    memcpy(buffer, "doggodogdog", size);
    lfs2_file_seek(&lfs2, &file, pos, LFS2_SEEK_SET) => pos;
    lfs2_file_write(&lfs2, &file, buffer, size) => size;

    lfs2_file_seek(&lfs2, &file, pos, LFS2_SEEK_SET) => pos;
    lfs2_file_read(&lfs2, &file, buffer, size) => size;
    memcmp(buffer, "doggodogdog", size) => 0;

    lfs2_file_rewind(&lfs2, &file) => 0;
    lfs2_file_read(&lfs2, &file, buffer, size) => size;
    memcmp(buffer, "kittycatcat", size) => 0;

    lfs2_file_seek(&lfs2, &file, pos, LFS2_SEEK_SET) => pos;
    lfs2_file_read(&lfs2, &file, buffer, size) => size;
    memcmp(buffer, "doggodogdog", size) => 0;

    lfs2_file_seek(&lfs2, &file, -size, LFS2_SEEK_END) >= 0 => 1;
    lfs2_file_read(&lfs2, &file, buffer, size) => size;
    memcmp(buffer, "kittycatcat", size) => 0;

    size = lfs2_file_size(&lfs2, &file);
    lfs2_file_seek(&lfs2, &file, 0, LFS2_SEEK_CUR) => size;

    lfs2_file_close(&lfs2, &file) => 0;
    lfs2_unmount(&lfs2) => 0;
'''

[[case]] # boundary seek and writes
define.COUNT = 132
define.OFFSETS = '"{512, 1020, 513, 1021, 511, 1019, 1441}"'
code = '''
    lfs2_format(&lfs2, &cfg) => 0;
    lfs2_mount(&lfs2, &cfg) => 0;
    lfs2_file_open(&lfs2, &file, "kitty",
            LFS2_O_WRONLY | LFS2_O_CREAT | LFS2_O_APPEND) => 0;
    size = strlen("kittycatcat");
    memcpy(buffer, "kittycatcat", size);
    for (int j = 0; j < COUNT; j++) {
        lfs2_file_write(&lfs2, &file, buffer, size);
    }
    lfs2_file_close(&lfs2, &file) => 0;
    lfs2_unmount(&lfs2) => 0;

    lfs2_mount(&lfs2, &cfg) => 0;
    lfs2_file_open(&lfs2, &file, "kitty", LFS2_O_RDWR) => 0;

    size = strlen("hedgehoghog");
    const lfs2_soff_t offsets[] = OFFSETS;

    for (unsigned i = 0; i < sizeof(offsets) / sizeof(offsets[0]); i++) {
        lfs2_soff_t off = offsets[i];
        memcpy(buffer, "hedgehoghog", size);
        lfs2_file_seek(&lfs2, &file, off, LFS2_SEEK_SET) => off;
        lfs2_file_write(&lfs2, &file, buffer, size) => size;
        lfs2_file_seek(&lfs2, &file, off, LFS2_SEEK_SET) => off;
        lfs2_file_read(&lfs2, &file, buffer, size) => size;
        memcmp(buffer, "hedgehoghog", size) => 0;

        lfs2_file_seek(&lfs2, &file, 0, LFS2_SEEK_SET) => 0;
        lfs2_file_read(&lfs2, &file, buffer, size) => size;
        memcmp(buffer, "kittycatcat", size) => 0;

        lfs2_file_seek(&lfs2, &file, off, LFS2_SEEK_SET) => off;
        lfs2_file_read(&lfs2, &file, buffer, size) => size;
        memcmp(buffer, "hedgehoghog", size) => 0;

        lfs2_file_sync(&lfs2, &file) => 0;

        lfs2_file_seek(&lfs2, &file, 0, LFS2_SEEK_SET) => 0;
        lfs2_file_read(&lfs2, &file, buffer, size) => size;
        memcmp(buffer, "kittycatcat", size) => 0;

        lfs2_file_seek(&lfs2, &file, off, LFS2_SEEK_SET) => off;
        lfs2_file_read(&lfs2, &file, buffer, size) => size;
        memcmp(buffer, "hedgehoghog", size) => 0;
    }

    lfs2_file_close(&lfs2, &file) => 0;
    lfs2_unmount(&lfs2) => 0;
'''

[[case]] # out of bounds seek
define = [
    {COUNT=132, SKIP=4},
    {COUNT=132, SKIP=128},
    {COUNT=200, SKIP=10},
    {COUNT=200, SKIP=100},
    {COUNT=4,   SKIP=2},
    {COUNT=4,   SKIP=3},
]
code = '''
    lfs2_format(&lfs2, &cfg) => 0;
    lfs2_mount(&lfs2, &cfg) => 0;
    lfs2_file_open(&lfs2, &file, "kitty",
            LFS2_O_WRONLY | LFS2_O_CREAT | LFS2_O_APPEND) => 0;
    size = strlen("kittycatcat");
    memcpy(buffer, "kittycatcat", size);
    for (int j = 0; j < COUNT; j++) {
        lfs2_file_write(&lfs2, &file, buffer, size);
    }
    lfs2_file_close(&lfs2, &file) => 0;
    lfs2_unmount(&lfs2) => 0;
    lfs2_mount(&lfs2, &cfg) => 0;
    lfs2_file_open(&lfs2, &file, "kitty", LFS2_O_RDWR) => 0;

    size = strlen("kittycatcat");
    lfs2_file_size(&lfs2, &file) => COUNT*size;
    lfs2_file_seek(&lfs2, &file, (COUNT+SKIP)*size,
            LFS2_SEEK_SET) => (COUNT+SKIP)*size;
    lfs2_file_read(&lfs2, &file, buffer, size) => 0;

    memcpy(buffer, "porcupineee", size);
    lfs2_file_write(&lfs2, &file, buffer, size) => size;

    lfs2_file_seek(&lfs2, &file, (COUNT+SKIP)*size,
            LFS2_SEEK_SET) => (COUNT+SKIP)*size;
    lfs2_file_read(&lfs2, &file, buffer, size) => size;
    memcmp(buffer, "porcupineee", size) => 0;

    lfs2_file_seek(&lfs2, &file, COUNT*size,
            LFS2_SEEK_SET) => COUNT*size;
    lfs2_file_read(&lfs2, &file, buffer, size) => size;
    memcmp(buffer, "\0\0\0\0\0\0\0\0\0\0\0", size) => 0;

    lfs2_file_seek(&lfs2, &file, -((COUNT+SKIP)*size),
            LFS2_SEEK_CUR) => LFS2_ERR_INVAL;
    lfs2_file_tell(&lfs2, &file) => (COUNT+1)*size;

    lfs2_file_seek(&lfs2, &file, -((COUNT+2*SKIP)*size),
            LFS2_SEEK_END) => LFS2_ERR_INVAL;
    lfs2_file_tell(&lfs2, &file) => (COUNT+1)*size;

    lfs2_file_close(&lfs2, &file) => 0;
    lfs2_unmount(&lfs2) => 0;
'''

[[case]] # inline write and seek
define.SIZE = [2, 4, 128, 132]
code = '''
    lfs2_format(&lfs2, &cfg) => 0;
    lfs2_mount(&lfs2, &cfg) => 0;
    lfs2_file_open(&lfs2, &file, "tinykitty",
            LFS2_O_RDWR | LFS2_O_CREAT) => 0;
    int j = 0;
    int k = 0;

    memcpy(buffer, "abcdefghijklmnopqrstuvwxyz", 26);
    for (unsigned i = 0; i < SIZE; i++) {
        lfs2_file_write(&lfs2, &file, &buffer[j++ % 26], 1) => 1;
        lfs2_file_tell(&lfs2, &file) => i+1;
        lfs2_file_size(&lfs2, &file) => i+1;
    }

    lfs2_file_seek(&lfs2, &file, 0, LFS2_SEEK_SET) => 0;
    lfs2_file_tell(&lfs2, &file) => 0;
    lfs2_file_size(&lfs2, &file) => SIZE;
    for (unsigned i = 0; i < SIZE; i++) {
        uint8_t c;
        lfs2_file_read(&lfs2, &file, &c, 1) => 1;
        c => buffer[k++ % 26];
    }

    lfs2_file_sync(&lfs2, &file) => 0;
    lfs2_file_tell(&lfs2, &file) => SIZE;
    lfs2_file_size(&lfs2, &file) => SIZE;

    lfs2_file_seek(&lfs2, &file, 0, LFS2_SEEK_SET) => 0;
    for (unsigned i = 0; i < SIZE; i++) {
        lfs2_file_write(&lfs2, &file, &buffer[j++ % 26], 1) => 1;
        lfs2_file_tell(&lfs2, &file) => i+1;
        lfs2_file_size(&lfs2, &file) => SIZE;
        lfs2_file_sync(&lfs2, &file) => 0;
        lfs2_file_tell(&lfs2, &file) => i+1;
        lfs2_file_size(&lfs2, &file) => SIZE;
        if (i < SIZE-2) {
            uint8_t c[3];
            lfs2_file_seek(&lfs2, &file, -1, LFS2_SEEK_CUR) => i;
            lfs2_file_read(&lfs2, &file, &c, 3) => 3;
            lfs2_file_tell(&lfs2, &file) => i+3;
            lfs2_file_size(&lfs2, &file) => SIZE;
            lfs2_file_seek(&lfs2, &file, i+1, LFS2_SEEK_SET) => i+1;
            lfs2_file_tell(&lfs2, &file) => i+1;
            lfs2_file_size(&lfs2, &file) => SIZE;
        }
    }

    lfs2_file_seek(&lfs2, &file, 0, LFS2_SEEK_SET) => 0;
    lfs2_file_tell(&lfs2, &file) => 0;
    lfs2_file_size(&lfs2, &file) => SIZE;
    for (unsigned i = 0; i < SIZE; i++) {
        uint8_t c;
        lfs2_file_read(&lfs2, &file, &c, 1) => 1;
        c => buffer[k++ % 26];
    }

    lfs2_file_sync(&lfs2, &file) => 0;
    lfs2_file_tell(&lfs2, &file) => SIZE;
    lfs2_file_size(&lfs2, &file) => SIZE;

    lfs2_file_close(&lfs2, &file) => 0;
    lfs2_unmount(&lfs2) => 0;
'''

[[case]] # file seek and write with power-loss
# must be power-of-2 for quadratic probing to be exhaustive
define.COUNT = [4, 64, 128]
reentrant = true
code = '''
    err = lfs2_mount(&lfs2, &cfg);
    if (err) {
        lfs2_format(&lfs2, &cfg) => 0;
        lfs2_mount(&lfs2, &cfg) => 0;
    }
    err = lfs2_file_open(&lfs2, &file, "kitty", LFS2_O_RDONLY);
    assert(!err || err == LFS2_ERR_NOENT);
    if (!err) {
        if (lfs2_file_size(&lfs2, &file) != 0) {
            lfs2_file_size(&lfs2, &file) => 11*COUNT;
            for (int j = 0; j < COUNT; j++) {
                memset(buffer, 0, 11+1);
                lfs2_file_read(&lfs2, &file, buffer, 11) => 11;
                assert(memcmp(buffer, "kittycatcat", 11) == 0 ||
                       memcmp(buffer, "doggodogdog", 11) == 0);
            }
        }
        lfs2_file_close(&lfs2, &file) => 0;
    }

    lfs2_file_open(&lfs2, &file, "kitty", LFS2_O_WRONLY | LFS2_O_CREAT) => 0;
    if (lfs2_file_size(&lfs2, &file) == 0) {
        for (int j = 0; j < COUNT; j++) {
            strcpy((char*)buffer, "kittycatcat");
            size = strlen((char*)buffer);
            lfs2_file_write(&lfs2, &file, buffer, size) => size;
        }
    }
    lfs2_file_close(&lfs2, &file) => 0;

    strcpy((char*)buffer, "doggodogdog");
    size = strlen((char*)buffer);

    lfs2_file_open(&lfs2, &file, "kitty", LFS2_O_RDWR) => 0;
    lfs2_file_size(&lfs2, &file) => COUNT*size;
    // seek and write using quadratic probing to touch all
    // 11-byte words in the file
    lfs2_off_t off = 0;
    for (int j = 0; j < COUNT; j++) {
        off = (5*off + 1) % COUNT;
        lfs2_file_seek(&lfs2, &file, off*size, LFS2_SEEK_SET) => off*size;
        lfs2_file_read(&lfs2, &file, buffer, size) => size;
        assert(memcmp(buffer, "kittycatcat", size) == 0 ||
               memcmp(buffer, "doggodogdog", size) == 0);
        if (memcmp(buffer, "doggodogdog", size) != 0) {
            lfs2_file_seek(&lfs2, &file, off*size, LFS2_SEEK_SET) => off*size;
            strcpy((char*)buffer, "doggodogdog");
            lfs2_file_write(&lfs2, &file, buffer, size) => size;
            lfs2_file_seek(&lfs2, &file, off*size, LFS2_SEEK_SET) => off*size;
            lfs2_file_read(&lfs2, &file, buffer, size) => size;
            assert(memcmp(buffer, "doggodogdog", size) == 0);
            lfs2_file_sync(&lfs2, &file) => 0;
            lfs2_file_seek(&lfs2, &file, off*size, LFS2_SEEK_SET) => off*size;
            lfs2_file_read(&lfs2, &file, buffer, size) => size;
            assert(memcmp(buffer, "doggodogdog", size) == 0);
        }
    }
    lfs2_file_close(&lfs2, &file) => 0;

    lfs2_file_open(&lfs2, &file, "kitty", LFS2_O_RDWR) => 0;
    lfs2_file_size(&lfs2, &file) => COUNT*size;
    for (int j = 0; j < COUNT; j++) {
        lfs2_file_read(&lfs2, &file, buffer, size) => size;
        assert(memcmp(buffer, "doggodogdog", size) == 0);
    }
    lfs2_file_close(&lfs2, &file) => 0;
    lfs2_unmount(&lfs2) => 0;
'''