汇编源码系列之getspace

汇编源码系列之getspace2008-04-30这个都是过去DOS时代的汇编源码，虽然已经过去了，但是对于学习汇编还是有帮助的，汇编语言只是程序员一门基础语言，大多人掌握即可，不一定要深入研究.......

CSEG  SEGMENT
PUBLIC  GETSPACE
GETSPACE  PROC FAR
  ASSUME  CS:CSEG
  PUSH   BP
  MOV  BP,SP
  MOV   BX,[BP]+6
  MOV  DI,[BX]+2
  MOV  CX,8
  MOV  AL," "
  CLD
  REP  STOSB
  MOV  BX,[BP]+8
  MOV  SI,[BX]+2
  MOV  AX,[SI]
  AND  AL,0DFH
  CMP  AL,41H
  JGE  CKVER
  JMP  EXITSPC
CKVER:
  PUSH  AX
  MOV  AH,30H
  INT  21H
  XCHG  AL,AH
SPACE20:
  POP  DX
  XOR  DL,40H
  MOV  AH,36H
    INT  21H
  CMP   AX,0FFFFH
  JE  EXITSPC
  XOR  DX,DX
  MUL  CX
  XCHG  BX,CX
  MUL  CX
  PUSH  AX
  PUSH  DX
ENDSPC:
  MOV  BX,[BP]+6
  MOV  DI,[BX]+2
  ADD  DI,7
  POP  DX
  POP  AX
  
HEXTODEC:
  MOV  SI,10
  PUSH  AX
  MOV  AX,DX
  XOR  DX,DX
  DIV  SI
  POP  CX
  PUSH  AX
  MOV  AX,CX
  DIV  SI
  POP  SI
  OR  DL,30H
  MOV  BYTE PTR [DI],DL
  DEC  DI
  XCHG  DX,SI
  OR  AX,AX
  JNZ  HEXTODEC
EXITSPC:
  POP  BP
  RET  4
  RET
GETSPACE  ENDP
CSEG    ENDS
  END