dwtoa is checking if the value to be converted is negative number

[Technos]

Hi Technos,

Here is a quick example :

Code Select Expand

include     \masm32\include\masm32rt.inc

.data?

buffer      db 16 dup(?)

.code

start:

    invoke  dwtoa,-5,ADDR buffer
    invoke  StdOut,ADDR buffer

    invoke  ExitProcess,0

END start

Build the code as a console output, you should see -5 after running the executable.

Hi Vortex,

I think I may have confused a lot of people with my post - non-native English speaker here... Anyway, my understanding with dwtoa (DWORD to o ASCII?) is that it should only handle DWORD (positive numbers). For example, the following will return -1, I am expecting it to print 4294967295.

Code Select Expand

include     \masm32\include\masm32rt.inc

.data?

buffer      db 16 dup(?)

.code

start:

    invoke  dwtoa,4294967295,ADDR buffer
    invoke  StdOut,ADDR buffer

    invoke  ExitProcess,0

END start

[jj2007]

Hi Technos,

It's just a little glitch in the documentation, which should say SDWORD, that's all.

But thanks to your post I discovered a weird little glitch in my own Str$() implementation:

Code Select Expand

include \masm32\MasmBasic\MasmBasic.inc
  Init
  Cls
  or ecx, -1 ; 4294967295 as DWORD, 18446744073709551615 as QWORD
  PrintLine Str$("%i=", ecx), Str$("%u", ecx)
  PrintLine Str$("%i=", ecx), Str$("%u ", ecx)
EndOfCode

Output:

Code Select Expand

-1=18446744073709551615
-1=4294967295

The %u format prints a QWORD, surprise! However, if followed by a blank, it prints a DWORD. Will have to investigate

[hutch--]

Timo posted the one that works on unsigned integers greater than 2 gig.

; ¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤
    include \masm32\include\masm32rt.inc
; ¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤

comment * -----------------------------------------------------
                        Build this  template with
                       "CONSOLE ASSEMBLE AND LINK"
        ----------------------------------------------------- *

    .code

start:
   
; ¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤

    call main
    inkey
    exit

; ¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤

main proc

    LOCAL pvar   :DWORD
    LOCAL buffer[32]:BYTE

    lea edx, buffer
    mov pvar, edx

    invoke crt__ultoa,1024*1024*1024*3,pvar,10      ; 3 gig

    print pvar,13,10

    ret

main endp

; ¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤

end start

[raymond]

Hi Technos

You may want to have a look at the smdtoa, smqtoa, umdtoa and umqtoa procedures included in the FPULIB available on this site (or on my site at ray.masm.com). The 's' and 'm' prefixes are for signed and unsigned dwords/qwords.

The "m" in the procedure name is to indicate that this procedure is based on the principal of multiplying by the reciprocal of 10 instead of dividing by 10, i.e. the use of "magic numbers".

Note: The source code of all the functions are part of the downloadable fpulib package.