fsetpos---restore position of a stream or file#include <stdio.h> int fsetpos(FILE *fp, const fpos_t *pos);Description
FILE can have a "position" that records how much
of the file your program has already read. Many of the stdio functions
depend on this position, and many change it as a side effect.
You can use fsetpos to return the file identified by fp to a previous
position *pos (after first recording it with fgetpos).
See fseek for a similar facility.
Returns
fgetpos returns 0 when successful. If fgetpos fails, the
result is 1. The reason for failure is indicated in errno:
either ESPIPE (the stream identified by fp doesn't support
repositioning) or EINVAL (invalid file position).
Portability
ANSI C requires fsetpos, but does not specify the nature of
*pos beyond identifying it as written by fgetpos.
Supporting OS subroutines required: close, fstat, isatty,
lseek, read, sbrk, write.