Integer to ascii algorithm.

[jj2007]

Just in case you are running a GUI app, the combination of SetDlgItemInt and WM_GETTEXT is an attractive original WinAPI option 8)

[Mikl__]

Convertion of 64 bit unsigned integer to decimal ASCIIZ string

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.586
.MMX
.model flat,stdcall
option casemap:none
.data
ALIGN 8
mmxb0F dq 0F0F0F0F0F0F0F0Fh
mmxb30 dq 3030303030303030h
num dq 12345678901234567890
.data?
buffer db 24 dup (?)
.code

    mov edx,dword ptr num+4
    mov eax,dword ptr num
    mov edi, offset buffer

N19H EQU 00DE0B6B3H
N19L EQU 0A7640000H
N20H EQU 08AC72304H
N20L EQU 089E80000H

Q2Ammx proc uses edi lpBuffer, lpNumber
    mov ecx,lpNumber
    mov eax,[ecx]
    mov edx,[ecx+4]
    mov edi,lpBuffer
    sub esp,12
    xor ecx,ecx
    cmp edx,N19H
    jb     @@nm18
    jne   @@cp20
    cmp eax,N19L
    jb     @@nm18
@@cp20:
    cmp edx,N20H
    jb     @@do19
    jne   @@do20
    cmp eax,N20L
    jb     @@do19
@@do20:
    mov cl,10h-1
    sub  eax,N20L
    sbb edx,N20H
@@lp19:
    inc ecx
@@do19:
    sub eax,N19L
    sbb edx,N19H
    jae  @@lp19
    add eax,N19L
    adc edx,N19H
@@nm18:
    push edx
    push eax
    fild qword ptr [esp]
    fbstp [esp]
    mov [esp+9],ecx

    mov edx,2
    cmp dword ptr [esp+8],0
    jne @@dg16
    cmp dword ptr [esp+4],1
    sbb edx,1
@@dg16:
    bsr ecx,[esp+edx*4]
    je @@zero
    shr ecx,3
    lea eax,[ecx+4*edx]
    lea edx,[eax+eax]
    cmp byte ptr [esp][eax],10h
    sbb edx,-1

    movq mm(7),mmxb0F
    movq mm(6),mmxb30
    movq mm(0),[esp]
    movq mm(4),[esp+8]
    movq mm(1),mm(0)
    psrlq mm(1),4
    pand mm(0),mm(7)
    por    mm(0),mm(6)
    pand mm(1),mm(7)
    por mm(1),mm(6)
    movq mm(2),mm(0)
    punpcklbw mm(0),mm(1)
    movq [esp],mm(0)
    punpckhbw mm(2),mm(1)
    movq [esp+8],mm(2)
    movq mm(5),mm(4)
    psrlq mm(5),4
    pand mm(4),mm(7)
    por mm(4),mm(6)
    pand mm(5),mm(7)
    por mm(5),mm(6)
    punpcklbw mm(4),mm(5)
    movd [esp+16],mm(4)
    emms
@@lpS:
    mov eax,[esp+edx-3]
    bswap eax
    mov [edi],eax
    add edi,4
    sub edx,4
    jns  @@lpS
    mov byte ptr [edi][edx][1],0
    add esp,20
    ret
@@zero:
    mov dword ptr [edi],'0'
    add esp,20
    ret
Q2Ammx endp

    end

64 bit to dec ASCIIZ - 2 with MMX

Code Select Expand

.586
.MMX
.model flat,stdcall
option casemap:none

.data
ALIGN 8
mmxb0F dq 0F0F0F0F0F0F0F0Fh
mmxb30 dq 3030303030303030h

.code
Q2Ammxf proc uses edi lpBuffer,lpNumber
    mov ecx,lpNumber
    mov edi,lpBuffer
    mov eax,[ecx]
    mov edx,[ecx+4]

D05H    equ 045639182h
D05L    equ 044F40000h
D04H    equ 03782DACEh
D04L    equ 09D900000h
D01H    equ 00DE0B6B3h
D01L    equ 0A7640000h
QtoA:
    sub esp,12
    xor ecx,ecx
    sub eax,D01L
    sbb edx,D01H
    jb    @@a01f
    sub eax,D04L
    sbb edx,D04H
    jb    @@a05
    mov cl,05h
    sub eax,D05L
    sbb edx,D05H
    jb    @@a05
    mov cl,15h
    sub eax,D05L
    sbb edx,D05H
    jae  @@l01
    mov cl,10h
@@a05:
    add eax,D05L
    adc edx,D05H
@@l01:  inc ecx
    sub eax,D01L
    sbb edx,D01H
    jae  @@l01
    dec ecx
@@a01f:
    add eax,D01L
    adc edx,D01H

    push edx
    push eax
    fild qword ptr [esp]
    fbstp [esp]
    mov [esp+9],ecx
    mov edx,2
    cmp dword ptr [esp+8],0
    jne @@dg16
    cmp dword ptr [esp+4],1
    sbb edx,1
@@dg16:
    bsr ecx,[esp+edx*4]
    je @@zero
    shr ecx,3
    lea eax,[ecx+4*edx]
    lea edx,[eax+eax]
    cmp byte ptr [esp][eax],10h
    sbb edx,-1

    movq mm(7),mmxb0F
    movq mm(6),mmxb30
    movq mm(0),[esp]
    movq mm(4),[esp+8]
    movq mm(1),mm(0)
    psrlq mm(1),4
    pand mm(0),mm(7)
    por    mm(0),mm(6)
    pand mm(1),mm(7)
    por mm(1),mm(6)
    movq mm(2),mm(0)
    punpcklbw mm(0),mm(1)
    movq [esp],mm(0)
    punpckhbw mm(2),mm(1)
    movq [esp+8],mm(2)
    movq mm(5),mm(4)
    psrlq mm(5),4
    pand mm(4),mm(7)
    por mm(4),mm(6)
    pand mm(5),mm(7)
    por mm(5),mm(6)
    punpcklbw mm(4),mm(5)
    movd [esp+16],mm(4)
    emms
@@lpS:
    mov eax,[esp+edx-3]
    bswap eax
    mov [edi],eax
    add edi,4
    sub edx,4
    jns  @@lpS
    mov byte ptr [edi][edx][1],0
    add esp,20
    ret
@@zero:
    mov dword ptr [edi],'0'
    add esp,20
    ret
Q2Ammxf endp
    end

[fearless]

Does anyone have a function similar to these that converts a qword 64bit value to ascii hex? ive searched the forums here and other places but cant seem to find anything, so just wondering if someone has one that they could share. Cheers.

[jj2007]

Does anyone have a function similar to these that converts a qword 64bit value to ascii hex?

include \masm32\MasmBasic\MasmBasic.inc      ; download
  SetGlobals MyQ:QWORD=1234567812345678h
  Init
  Inkey "MyQ=", Hex$(MyQ)
EndOfCode