fseek(3s) fseek(3s)
Name
fseek, ftell, rewind - reposition a file pointer in a stream
Syntax
#include <stdio.h>
int fseek(stream, offset, ptrname)
FILE *stream;
long offset;
int ptrname;
long ftell(stream)
FILE *stream;
void rewind(stream)
FILE *stream;
Description
The function sets the position of the next input or output operation on the stream. The new position is at the signed distance offset
bytes from the beginning, the current position, or the end of the file, according as ptrname has the value SEEK_SET, SEEK_CUR, or SEEK_END.
The function undoes any effects of
The function returns the current value of the offset relative to the beginning of the file associated with the named stream. It is mea-
sured in bytes and is the only foolproof way to obtain an offset for
The (stream) function is equivalent to (stream , 0L, 0, SEEK_SET), except that no value is returned.
Return Values
The function returns -1 for improper seeks, otherwise 0.
See Also
lseek(2), fopen(3s)
fseek(3s)
