for (ofs = 0; ofs < BUF_SIZE; ofs += CHUNK_SIZE)
CHECK (write (fd, buf + ofs, CHUNK_SIZE) > 0,
"write %d bytes at offset %zu in \"%s\"",
for (ofs = 0; ofs < BUF_SIZE; ofs += CHUNK_SIZE)
CHECK (write (fd, buf + ofs, CHUNK_SIZE) > 0,
"write %d bytes at offset %zu in \"%s\"",