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8.14 垫子 (Pads)

• WINDOW *newpad(nlines, ncols)  
  
• WINDOW *subpad(orig, nlines, ncols, begy, begx)  
  
• int prefresh(pad, pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol)  
  
• int pnoutrefresh(pad, pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol)  
  
• int pechochar(pad, ch)