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ALIB30B
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CONV10.ASM
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Assembly Source File
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1994-10-31
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1KB
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62 lines
page 66,132
;******************************** CONV10.ASM *********************************
LIBSEG segment byte public "LIB"
assume cs:LIBSEG , ds:nothing
;----------------------------------------------------------------------------
.xlist
include mac.inc
include common.inc
.list
comment
;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -( CONVERT )
;DEC_STR1_TO_WORD - convert unsigned ascii string to binary word
;
; inputs ds:si points at string ending with zero
;
; output bx = binary value
; si = updated to point at end of value
; al = 0 if success
;* * * * * * * * * * * * * *
extrn ten:word
public DEC_STR1_TO_WORD
DEC_STR1_TO_WORD proc far
push dx
cld
mov bx,0 ;set running sum = 0
;
; remove blanks in front of number
;
ab1: lodsb
cmp al,' '
je ab1 ;remove leading spaces
ab2: or al,al
jz ab_done ;jmp if done, end of string
sub al,'0'
js ab_done ;jmp if error, not number
cmp al,9
ja ab_done ;jmp if error, not number
sub ah,ah
push ax ;save current char
mov ax,bx ;get running sum
mul cs:ten
pop dx ;get current char
add ax,dx
mov bx,ax ;save running sum
lodsb
jmp ab2 ;loop till done
ab_done:
pop dx
RETF
DEC_STR1_TO_WORD ENDP
LIBSEG ENDS
end