Asume that an operating system exposes system calls for file access through three API functions. Using only the read, write, and seek functions declared below, implement a C function, copy, to copy data from one file to another. [2 points]

/* data : a buffer in main memory

* size : the number of bytes in one chunk of data

* count : the number of chunks to be read or written

* f : the file to be read to or written from

*/

void read(void *data, int size, int count, file f);

void write(void *data, int size, int count, file f);

/* offset : the amount to move the read/write head relative to the origin

* origin : position from which the head is offset {F_CUR, F_BEGIN, F_END}

* f : the file for which the head will be repositioned

*/

void seek(int offset, enum f_orig origin, file f);

Use the function header:

void copy(file f1, int start1, int length, file f2, int start2)