home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
C!T ROM 5
/
ctrom5b.zip
/
ctrom5b
/
PROGRAM
/
ASM
/
ALIB30B
/
CONV15.ASM
< prev
next >
Wrap
Assembly Source File
|
1994-10-31
|
1KB
|
53 lines
page 66,132
;******************************** CONV03.ASM *********************************
LIBSEG segment byte public "LIB"
assume cs:LIBSEG , ds:nothing
;----------------------------------------------------------------------------
.xlist
include mac.inc
include common.inc
.list
comment
;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -( CONVERT )
;DEC_STR2_TO_DWORD - convert unsigned ascii string to binary DWORD
;
; inputs ds:si = string ptr
; cx = string length
;
; output bx,dx = binary value
; si = updated to point at end of value
; al = zero if success
;* * * * * * * * * * * * * *
extrn dmul_10_plus:far
public DEC_STR2_TO_DWORD
DEC_STR2_TO_DWORD proc far
xor ah,ah ;
xor dx,dx ;running sum = 0
xor bx,bx ;running sum = 0
;
; remove blanks in front of number
;
sb13: lodsb
dec cx
cmp al,' '
je sb13 ;remove leading spaces
sb14: sub al,'0'
js sb6_done ;jmp if error, not number
cmp al,9
ja sb6_done ;jmp if error, not number
call dmul_10_plus ;compute (dx,ax) * 10 + bx
jcxz sb6_done ;jmp if done
jnc sb13 ;jmp if no errors
sb6_done:
RETF
DEC_STR2_TO_DWORD endp
LIBSEG ENDS
end