Assembly language > Assembly discussions

Title case convertion

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Vortex:
Hello,

Here is a title case convertion example :


--- Code: ---include TitleCase.inc

.data

LookupTable1    db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
                db 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1
                db 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1
                db 1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0
                db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
                db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
                db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
                db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0


LookupTable2    db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
                db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
                db 0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0
                db 0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0
                db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
                db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
                db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
                db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0


sample db 'WHAT/A[CRAZY]{NIGHT}(OF)<PROGRAMMING>?IT~WAS!',0
     
.code

TitleCase PROC uses esi edi ebx string:DWORD

    mov     ecx,1
    mov     esi,OFFSET LookupTable1
    mov     edx,OFFSET LookupTable2
    mov     ebx,ecx
    mov     edi,string
    sub     edi,ebx

@@:
    add     edi,ecx
    movzx   eax,BYTE PTR [edi]
    test    eax,eax
    jz      finish
   
    cmp     BYTE PTR [esi+eax],cl
    jne     CheckTable2
    mov     ebx,1
    jmp     @b

CheckTable2:

    cmp     BYTE PTR [edx+eax],cl
    jne     @b

    or      eax,32
    mov     BYTE PTR [edi],al

    cmp     ebx,ecx
    jne     @b

    sub     eax,32
    mov     BYTE PTR [edi],al
    xor     ebx,ebx

    jmp     @b   
   
finish:

    ret

TitleCase ENDP   

start:

    invoke  TitleCase,ADDR sample
    invoke  printf,ADDR sample

    invoke  ExitProcess,0

END start
--- End code ---

TimoVJL:
Nice variation of Proper function  ;)

Vortex:
Hi Timo,

Thanks. Attached is the quick convertion to 64-bit.

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