Find the longest sentence in a string.

[nikola99]

Hello everybody. I need to find the longest sentence in a string, for example "Abc. Abcd. Abcde". Does anyone have any idea how to do this?

[clive]

Yes, several.

Post the code you have so far, we don't do homework assignments.

[oex]

:lol nice 1 clive I nearly got suckered into that one

EDIT: I wrote the proc if you have a good start :lol

[qWord]

Code Select Expand

.data
szTest db "Abc. Abcd. Abcde",0
.code

lea esi,szTest
movzx eax,BYTE ptr [esi]
mov ebx,esi
mov edi,esi
xor edx,edx
xor ecx,ecx
.while 1
lea esi,[esi+1]
.if eax == '.' || !eax
.if edx > ecx
mov ecx,edx
mov edi,ebx
.endif
xor edx,edx
mov ebx,esi
.break .if !eax
.else
lea edx,[edx+1]
.endif
movzx eax,BYTE ptr [esi]
.endw
; edi = pointer to largest sentence
; ecx = size of sentence

[oex]

:lol

[dedndave]

if he hands that in, qWord, his instructor will know she(he?) didn't write it   :P

[joemc]

i am confused. why lea esi, [esi+1],  is it faster ?

edit: Thinking about it, it actually makes more sense than an add.

[clive]

Plus it can be really useful if you don't want to effect the flags, especially the carry ie lea esi,[esi+4].

[dedndave]

inc esi might be better
if the step were more than one, i might use lea
inc does affect the flags - but always leaves the carry flag unchanged
inc reg32 is a single byte instruction - this can make the overall loop smaller - which is the real advantage

[qWord]

if he hands that in, qWord, his instructor will know she(he?) didn't write it   :P

what would his instructor then said to this this (obfuscated) code ? :cheekygreen::

Code Select Expand

lea esi,szTest
movzx eax,BYTE ptr [esi]
mov ebx,esi
mov edi,esi
xor edx,edx
xor ecx,ecx
xor ebp,ebp
.while 1
lea esi,[esi+1]
xor eax,0ffffffd1h
add eax,1
adc ebp,0
xor eax,02dh
add eax,1
adc ebp,0
mov ebp,0
lea edx,[edx+1]
cmovnp edx,ebp
cmovnp ebx,esi
cmp edx,ecx
cmova ecx,edx
cmova edi,ebx
test eax,eax
.break .if ZERO?
movzx eax,BYTE ptr [esi]
.endw
; edi = pointer to largest sentence
; ecx = size of sentence
qword