cppreference.com > Standard C I/O > fseek fseek Syntax:
      #include <stdio.h>
      int fseek( FILE *stream, long offset, int origin );
The function fseek() sets the file position data for the given stream. The origin value should have one of the following values (defined in stdio.h):
Name | Explanation
--- | ---
SEEK_SET | Seek from the start of the file
SEEK_CUR | Seek from the current location
SEEK_END | Seek from the end of the file
fseek() returns zero upon success, non-zero on failure. You can use fseek() to move beyond a file, but not before the beginning. Using fseek() clears the EOF flag associated with that stream. Related topics: fgetpos fopen fsetpos ftell rewind