isgraph.mac

来自「--- --- ---基于C语言的编译器的 简单实现」· MAC 代码 · 共 37 行

 INCLUDE PROLOG.H
_CC1:
 PUBLIC _isgraph
_isgraph:
 MOV BX,2
 ADD BX,SP
 MOV BX,[BX]
 XCHG DX,BX
 MOV BX,33
 CMP DX,BX
 MOV BX,CX
 JL $+3
 INC BX
 OR BX,BX
 JNZ $+5
 JMP _CC3
 MOV BX,2
 ADD BX,SP
 MOV BX,[BX]
 XCHG DX,BX
 MOV BX,126
 CMP DX,BX
 MOV BX,CX
 JG $+3
 INC BX
 OR BX,BX
 JNZ $+5
 JMP _CC3
 MOV BX,1
 JMP _CC4
_CC3:
 MOV BX,0
_CC4:
 RET
 INCLUDE EPILOG.H
 END