Truncation occurred because: 1) the specified record length on the write operation was larger than the record buffer size; 2) an attempt to extend the record buffer for a CMS variable length file failed which caused record truncation; or 3) the record read in was larger than the record buffer size.
The return value depends on the operation attempted. In all cases, the buffer will be read or written up to the point where truncation occurred.
For a text stream, place the newline character earlier in the record to shorten the record size. For a file opened for record I/O, specify a smaller number of bytes for fread(), fwrite(), or fupdate().
EDC4SB