CRTL, fseek, Description
*Conan The Librarian
This function can position fixed-length record-access file with no carriage control or a stream-access file on any byte offset, but can position all other files only on record boundaries. The available Standard I/O functions position a variable-length or VFC record file at its first byte, at the end-of-file, or on a record boundary. Therefore, the arguments given to fseek must specify any of the following: o The beginning or end of the file o A 0 offset from the current position (an arbitrary record boundary) o The position returned by a previous, valid ftell call See the fgetpos and fsetpos functions for a portable way to seek to arbitrary locations with these types of record files. CAUTION If, while accessing a stream file, you seek beyond the end-of-file and then write to the file, the fseek function creates a hole by filling the skipped bytes with zeros. In general, for record files, fseek should only be directed to an absolute position that was returned by a previous valid call to ftell, or to the beginning or end of a file. If a call to fseek does not satisfy these conditions, the results are unpredictable. See also open, creat, dup, dup2, and lseek.