This is a File I/O function. It is not implemented in the Compiler.
#include <stdio.h>
int fsetpos(FILE *f, const fpos_t *pos);
fsetpos() sets the file position to pos, which must be a value returned by a previous call to fgetpos() on the same file. If the function is successful, it clears the file's end-of-file flag.
The position cannot be set beyond the end of the file.
Zero, if it was successful; non-zero otherwise.
fseek(), and