106 lines
3.0 KiB
NASM
106 lines
3.0 KiB
NASM
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name flo2hex
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title Convert Floating Point Number to Hex Ascii
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page 62,132
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; =====> FLO2HEX.ASM
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;****************************************************************
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;* TIPC Scheme Runtime Support *
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;* *
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;* (C) Copyright 1987 by Texas Instruments Incorporated. *
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;* All rights reserved. *
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;* *
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;* Author: Terry Caudill *
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;* Date written: 10 March 1987 *
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;****************************************************************
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DGROUP group data
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data segment word public 'DATA'
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assume DS:DGROUP
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hexbuf db 030h,031h,032h,033h,034h,035h,036h,037h,038h,039h
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db 041h,042h,043h,044h,045h,046h
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data ends
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XGROUP group PROGX
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PROGX segment byte public 'PROGX'
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assume CS:XGROUP,DS:DGROUP
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;************************************************************************
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;* *
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;* Routine Name: FLO2HEX *
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;* *
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;* Description: FLO2HEX is a %escape routine provided for PC+ and *
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;* is used to return the Hex Ascii value of a floating *
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;* point number when outputting kb's in fsl format. *
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;* *
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;* Calling Sequence: (FLO2HEX float string #words) *
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;* where: float = the floating point number *
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;* string = a return string to place result *
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;* #words = size of the float to be converted *
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;* will be 4 for floating point *
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;* *
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;* Note: Actually, this routine can be called with integers, etc. *
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;* *
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;************************************************************************
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INARGS struc
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OLDBP DW ?
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FRETN DD ? ; Far return to 'prog' segment
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NRETN DW ? ; Return from flo2hex
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_STRING DW ?
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_FLOAT DW ?
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_WORDS DW ?
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INARGS ENDS
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%flo2hex proc far
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push BP
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mov BP,SP
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mov si,[bp]._FLOAT ; floating point value
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mov di,[bp]._STRING ; string for result
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mov dx,[bp]._WORDS ; #words to convert
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mov bx,offset hexbuf
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mov cl,4 ; shift count
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cld
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movdigits:
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lodsw ; get word to convert
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push ax ; save word
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shr ax,cl ; work on high byte
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shr ax,cl
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call cvthex ; convert lower byte
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stosw ; store into string
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pop ax ; restore word
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xor ah,ah ; now work lower byte
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call cvthex ; convert it
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stosw ; store into string
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dec dx ; any more words?
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jne movdigits ; yes, jump
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xor al,al ; 0 terminate the string
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stosb
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mov ax,[bp]._STRING ; return string
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pop BP
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ret ; return to caller.
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%flo2hex endp
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cvthex proc near
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shl ax,cl ; seperate digits
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shr al,cl ; work on lower nibble
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xlat ; convert to hex
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xchg ah,al ; work on upper nibble
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xlat ; convert to hex
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ret ; return with hex ascii value
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cvthex endp
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PROGX ends
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PGROUP group prog
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prog segment byte public 'PROG'
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assume CS:PGROUP
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public flo2hex
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flo2hex proc near
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call %flo2hex
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ret
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flo2hex endp
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prog ends
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end
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