375 lines
9.0 KiB
NASM
375 lines
9.0 KiB
NASM
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; Copyright (c) Mix Software 1988
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;
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; -------------------------------------------------------
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; farrepmem(address,data,datasize, copies)
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; fill memory with copies of a template
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; -------------------------------------------------------
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;
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IDT farrepmem
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IF LONGNAME
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LDEF farrepmem
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ENDIF
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IF SHORTNAME
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DEF Frepmem
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ENDIF
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;
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farrepmem equ $
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Frepmem PUSH BP
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MOV BP,SP
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MOV DX,[BP][%PARM6] ; number of copies
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TEST DX,DX
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JZ DONE
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MOV CX,[BP][%PARM5] ; size of block
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JCXZ DONE
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MOV DI,[BP][%PARM1] ; address of data
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MOV ES,[BP][%PARM2]
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CLD
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PUSH DS
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MOV DS,[BP][%PARM4]
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FILL MOV SI,[BP][%PARM3] ; pattern data
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MOV CX,[BP][%PARM5] ; size of block
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REP
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MOVSB
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DEC DX
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JNZ FILL
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POP CX
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MOV DS,CX
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DONE POP BP
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RETSEG
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END
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;
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; -------------------------------------------------------
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; farmemcpy(destination, source, n) - move block of memory
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; does not test for overlapping blocks
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; size is limited to 64k
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; does not check for segment wrap arround
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; -------------------------------------------------------
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;
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IDT farmemcpy
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IF LONGNAME
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LDEF farmemcpy
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ENDIF
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IF SHORTNAME
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DEF Fmemcpy
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ENDIF
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farmemcpy equ $
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Fmemcpy PUSH BP
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MOV BP,SP
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MOV CX,[BP][%PARM5]
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JCXZ DONE
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MOV DI,[BP][%PARM1]
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MOV ES,[BP][%PARM2]
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PUSH DS
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MOV SI,[BP][%PARM3]
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MOV DS,[BP][%PARM4]
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CLD
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REP
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MOVSB
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POP AX
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MOV DS,AX
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DONE MOV AX,[BP][%PARM1] ; Result is ptr to dest
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MOV DX,[BP][%PARM2]
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POP BP
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RETSEG
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END
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;
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; -------------------------------------------------------
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; farmemmove(destination, source, n) - move block of memory
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; checks for overlapping blocks
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; size is limited to 64k
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; -------------------------------------------------------
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;
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IDT farmemmove
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IF LONGNAME
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LDEF farmemmove
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ENDIF
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IF SHORTNAME
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DEF Fmemmove
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ENDIF
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farmemmove equ $
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Fmemmove PUSH BP
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MOV BP,SP
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MOV CX,[BP][%PARM5]
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JCXZ DONE
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MOV DI,[BP][%PARM2] ; dest segment
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MOV SI,[BP][%PARM4] ; src segment
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XOR AX,AX
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XOR DX,DX
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MOV CX,4 ; convert to 20 bit
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SHIFT1 SHL DI,1
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RCL DX,1
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SHL SI,1
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RCL AX,1
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LOOP SHIFT1
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ADD DI,[BP][%PARM1] ; dest offset
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ADC DX,0
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ADD SI,[BP][%PARM3] ; src offset
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ADC AX,0
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CMP DX,AX
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JB DSTLOWER
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JA SRCLOWER
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CMP DI,SI
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JB DSTLOWER
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JA SRCLOWER
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DONE MOV AX,[BP][%PARM1] ; Result is ptr to dest
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MOV DX,[BP][%PARM2]
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POP BP
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RETFAR
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DSTLOWER CLD
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MOV CX,[BP][%PARM5]
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XOR BX,BX
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JMPS MOVE
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SRCLOWER STD
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MOV CX,[BP][%PARM5]
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MOV BX,CX
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DEC BX ; length - 1
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MOVE PUSH SI
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PUSH DI
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MOV CX,4
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SHIFT2 SHR DX,1 ; Normalize pointers
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RCR DI,1
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SHR AX,1
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RCR SI,1
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LOOP SHIFT2
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MOV DX,DI
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MOV AX,SI
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POP DI
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AND DI,>F
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POP SI
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AND SI,>F
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ADD DI,BX
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ADC DX,0
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ADD SI,BX
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ADC AX,0
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MOV ES,DX
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PUSH DS
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MOV DS,AX
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MOV CX,[BP][%PARM5]
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REP
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MOVSB
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POP AX
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MOV DS,AX
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CLD
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JMPS DONE
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END
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;
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; -------------------------------------------------------
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; farmemswap(addr1, addr2, n) - swap two blocks of memory
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; -------------------------------------------------------
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;
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IDT farmemswap
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IF LONGNAME
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LDEF farmemswap
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ENDIF
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IF SHORTNAME
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DEF Fmemswap
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ENDIF
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;
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farmemswap equ $
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Fmemswap MOV BX,SP
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PUSH DS
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MOV SI,[BX][%PARM1-2]
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MOV DS,[BX][%PARM2-2]
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MOV DI,[BX][%PARM3-2]
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MOV ES,[BX][%PARM4-2]
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MOV CX,[BX][%PARM5-2]
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JCXZ DONE
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CLD
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SWAP SEGES
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MOV AL,[DI]
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XCHG AL,[SI]
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STOSB
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INC SI
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LOOP SWAP
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DONE POP AX
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MOV DS,AX
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RETSEG
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END
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;
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; -------------------------------------------------------
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; farmemset(addr, value, count) - fill a block with character
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; -------------------------------------------------------
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;
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IDT farmemset
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IF LONGNAME
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LDEF farmemset
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ENDIF
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IF SHORTNAME
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DEF Fmemset
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ENDIF
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;
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farmemset equ $
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Fmemset MOV BX,SP
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MOV DI,[BX][%PARM1-2]
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MOV ES,[BX][%PARM2-2]
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MOV AX,[BX][%PARM3-2]
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MOV CX,[BX][%PARM4-2]
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JCXZ DONE
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CLD
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REP
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STOSB
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DONE RETSEG
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END
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;
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; -------------------------------------------------------
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; farmemccpy(dest, src, c, cnt) - copy up to & including c
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; -------------------------------------------------------
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;
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IDT farmemccpy
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IF LONGNAME
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LDEF farmemccpy
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ENDIF
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IF SHORTNAME
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DEF Fmemccpy
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ENDIF
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;
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farmemccpy equ $
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Fmemccpy PUSH BP
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MOV BP,SP
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PUSH DS
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MOV DI,[BP][%PARM1]
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MOV ES,[BP][%PARM2]
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MOV SI,[BP][%PARM3]
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MOV DS,[BP][%PARM4]
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MOV DX,[BP][%PARM5]
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MOV CX,[BP][%PARM6]
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JCXZ ENDCOUNT
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CLD
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COPY LODSB
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STOSB
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CMP AL,DL
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JZ FOUND
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LOOP COPY
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ENDCOUNT XOR AX,AX ; Return null if c not copied
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EXIT POP CX
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MOV DS,CX
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POP BP
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RETSEG
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FOUND MOV AX,DI ; return address of next after c
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JMPS EXIT
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END
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;
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; -------------------------------------------------------
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; farmemchr(buf, c, cnt) - search for c in buffer
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; -------------------------------------------------------
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;
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IDT farmemchr
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IF LONGNAME
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LDEF farmemchr
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ENDIF
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IF SHORTNAME
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DEF Fmemchr
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ENDIF
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;
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farmemchr equ $
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Fmemchr PUSH BP
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MOV BP,SP
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MOV DI,[BP][%PARM1]
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MOV ES,[BP][%PARM2]
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MOV AX,[BP][%PARM3]
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MOV CX,[BP][%PARM4]
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CLD
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REPNZ
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SCASB
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JNZ NOFIND
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DEC DI
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MOV AX,DI ; Return pointer to c in buf
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POP BP
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RETSEG
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NOFIND XOR AX,AX ; Return null if not found
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POP BP
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RETSEG
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END
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;
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; -------------------------------------------------------
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; farmemcmp(buf1, buf2, cnt) - compare memory
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; -------------------------------------------------------
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;
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IDT farmemcmp
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IF LONGNAME
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LDEF farmemcmp
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ENDIF
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IF SHORTNAME
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DEF Fmemcmp
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ENDIF
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;
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farmemcmp equ $
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Fmemcmp PUSH BP
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MOV BP,SP
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PUSH DS
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MOV SI,[BP][%PARM1]
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MOV DS,[BP][%PARM2]
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MOV DI,[BP][%PARM3]
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MOV ES,[BP][%PARM4]
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MOV CX,[BP][%PARM5]
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COMPARE JCXZ EQUAL
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CLD
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REPZ
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CMPSB
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JZ EQUAL
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MOV AL,[SI][%-1]
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SEGES
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SUB AL,[DI][%-1]
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CBW
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EXIT POP CX
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MOV DS,CX
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POP BP
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RETSEG
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EQUAL XOR AX,AX ; Return 0 if buffers are equal
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JMPS EXIT
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END
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;
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; -------------------------------------------------------
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; farmemicmp(buf1, buf2, cnt) - compare memory
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; -------------------------------------------------------
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;
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IDT farmemicmp
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IF LONGNAME
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LDEF farmemicmp
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ENDIF
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IF SHORTNAME
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DEF Fmemicmp
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ENDIF
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;
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farmemicmp equ $
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Fmemicmp PUSH BP
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MOV BP,SP
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PUSH DS
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MOV SI,[BP][%PARM1]
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MOV DS,[BP][%PARM2]
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MOV DI,[BP][%PARM3]
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MOV ES,[BP][%PARM4]
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MOV CX,[BP][%PARM5]
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JCXZ EQUAL
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CLD
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MATCH REPZ
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CMPSB
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JZ EQUAL
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MOV AL,[SI][%-1]
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SEGES
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MOV AH,[DI][%-1]
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CMP AL,'a'
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JB X1
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CMP AL,'z'
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JA X1
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SUB AL,>20
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X1 CMP AH,'a'
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JB X2
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CMP AH,'z'
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JA X2
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SUB AH,>20
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X2 CMP AL,AH
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JZ MATCH
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MOV AL,[SI][%-1]
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SEGES
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SUB AL,[DI][%-1]
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CBW
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EXIT POP CX
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MOV DS,CX
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POP BP
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RETSEG
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EQUAL XOR AX,AX
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JMPS EXIT
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END
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