388     int cbAvail, minSize;  in PortFread()  local
416       minSize = cbRemain < cbAvail ? cbRemain : cbAvail;  in PortFread()
417       passert(minSize >= 0);  in PortFread()
419       cbRemain -= minSize;  in PortFread()
420       while (minSize-- > 0)  in PortFread()
445     int cbAvail, minSize;  in PortFwrite()  local
493       minSize = cbWrite < cbAvail ? cbWrite : cbAvail;  in PortFwrite()
495       memcpy((char *)PortFile->curPos, buffer, minSize);  in PortFwrite()
496       buffer += minSize;  in PortFwrite()
497       PortFile->curPos += minSize;  in PortFwrite()
501       cbWrite -= minSize;  in PortFwrite()
513     int cbAvail, minSize;  in PortFseek()  local
561         minSize = offset < cbAvail ? offset : cbAvail;  in PortFseek()
563         PortFile->curPos += minSize;  in PortFseek()
564         offset -= minSize;  in PortFseek()
582         minSize = -offset < cbAvail ? -offset : cbAvail;  in PortFseek()
584         PortFile->curPos -= minSize;  in PortFseek()
585         offset += minSize;  in PortFseek()