+ /* If offset is too large for return type, report error instead of wrong
+ offset value.
+ */
+ /* TODO: Check what happens when ungetc() is called on a stream at offset 0 */
+ if ( ( stream->pos.offset - stream->bufend ) > ( LONG_MAX - ( stream->bufidx - stream->ungetidx ) ) )
+ {
+ /* integer overflow */
+ _PDCLIB_errno = _PDCLIB_ERANGE;
+ return -1;
+ }
+ return (long int)( stream->pos.offset - ( ( (int)stream->bufend - (int)stream->bufidx ) + stream->ungetidx ) );