kolibrios/programs/develop/libraries/utils/trunk/_ftoa.inc

;-----------------------------------------------------------------------------+
; <EFBFBD>㭪<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>ॢ<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>⢥<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>᫠ <EFBFBD> <EFBFBD><EFBFBD>ப<EFBFBD>      [ by ManHunter / PCL ]   |
;-----------------------------------------------------------------------------|
; <EFBFBD><EFBFBD>ࠬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>:                                                                  |
;   lpFloat - 㪠<EFBFBD><EFBFBD>⥫<EFBFBD> <EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>⢥<EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>᫮ TBYTE                           |
;   lpResult - 㪠<EFBFBD><EFBFBD>⥫<EFBFBD> <EFBFBD><EFBFBD> <EFBFBD><EFBFBD>ப<EFBFBD>-<EFBFBD>ਥ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> १<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>                        |
;-----------------------------------------------------------------------------+

proc    FloatToString lpFloat:DWORD, lpResult:DWORD
    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>६<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    local   digits_count:DWORD
    local   old_cw:WORD
    local   new_cw:WORD
    local   saved_float:TBYTE
    local   tmp1 rb 11h
    local   tmp2 rb 11h

    ; <EFBFBD><EFBFBD><EFBFBD>࠭<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD> ॣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    pusha

    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>⥫<EFBFBD> <EFBFBD><EFBFBD> <EFBFBD><EFBFBD>ப<EFBFBD>-<EFBFBD>ਥ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    mov     edi,[lpResult]

    ; <EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD>?
    lea     esi,[lpFloat]
    cmp     dword [esi],0
    jne     loc_not_zero
    cmp     dword [esi+4],0
    jne     loc_not_zero
    cmp     word [esi+8],0
    jne     loc_not_zero
    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD> <EFBFBD><EFBFBD>ப<EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    mov     al,'0'
    stosb
    jmp     loc_ret

loc_not_zero:
    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>஢<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>᫮ <EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>६<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    push    edi
    mov     esi,[lpFloat]
    lea     edi,[saved_float]
    movsd
    movsd
    movsw
    pop     edi
    ; <EFBFBD><EFBFBD>᫮ <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>⥫쭮<EFBFBD>?
    cmp     dword [saved_float+6],0
    jge     loc_not_signed
    ; <EFBFBD>ਢ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>᫮ <EFBFBD> <EFBFBD><EFBFBD>᮫<EFBFBD>⭮<EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>祭<EFBFBD><EFBFBD>
    and     byte [saved_float+9],7Fh
    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD> <EFBFBD><EFBFBD>ப<EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    mov     al,'-'
    stosb

loc_not_signed:
    ; <EFBFBD>஢<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>᫮ <EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD>稥 <EFBFBD>஡<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD>
    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>⢮ <EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD> <EFBFBD><EFBFBD><EFBFBD>
    fclex
    ; <EFBFBD><EFBFBD><EFBFBD>࠭<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>ࠢ<EFBFBD><EFBFBD><EFBFBD>饥 ᫮<EFBFBD><EFBFBD>
    fstcw   [old_cw]
    ; <EFBFBD><EFBFBD>⠭<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>ࠢ<EFBFBD><EFBFBD><EFBFBD>饥 ᫮<EFBFBD><EFBFBD>
    mov     [new_cw],0000001001111111b
    fldcw   [new_cw]
    lea     esi,[saved_float]
    fld     tbyte [esi]
    fld     st
    ; <EFBFBD>뤥<EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD> <EFBFBD><EFBFBD><EFBFBD>冷<EFBFBD>
    fxtract
    fstp    st
    fldlg2
    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>⢮ <EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD> <EFBFBD><EFBFBD>᫥
    fmulp   st1,st
    fistp   [digits_count]
    ; <EFBFBD>᫨ <EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 16, <EFBFBD><EFBFBD> <EFBFBD><EFBFBD>᫮ <EFBFBD>⮡ࠦ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD>
    ; <EFBFBD><EFBFBD>ଠ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ᮩ <EFBFBD> <EFBFBD><EFBFBD>ᯮ<EFBFBD><EFBFBD><EFBFBD>⮩
    cmp     [digits_count],10h
    jnb     loc_not_integer
    ; <EFBFBD> <EFBFBD><EFBFBD>᫠ <EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD>஡<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>?
    fld     st
    frndint
    fcomp   st1
    fstsw   ax
    test    ah,01000000b
    ; <EFBFBD><EFBFBD>, <EFBFBD>⮡ࠦ<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>᫮ <EFBFBD> <EFBFBD>஡<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    jz      loc_not_integer

    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>᫮ <EFBFBD><EFBFBD><EFBFBD> <EFBFBD>஡<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD> <EFBFBD><EFBFBD>ᯮ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    lea     eax,[tmp1]
    fbstp   [eax]

    ; <EFBFBD><EFBFBD>ॢ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> BCD-<EFBFBD><EFBFBD>᫮ <EFBFBD> <EFBFBD><EFBFBD>ப<EFBFBD>
    push    edi
    lea     esi,[tmp1+8]
    lea     edi,[tmp2]
    mov     ecx, 9
@@:
    std
    xor     eax,eax
    lodsb
    cld
    rol     ax,12
    rol     ah,4
    add     ax,'00'
    stosw
    loop    @b
    pop     edi

    ; <EFBFBD>ய<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>騩 <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    mov     eax,11h
    mov     ecx,[digits_count]
    sub     eax,ecx
    inc     ecx
    lea     esi,[tmp2+eax]
    cmp     byte [esi],'0'
    jne     @f
    inc     esi
    dec     ecx
@@:
    ; <EFBFBD><EFBFBD>७<EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD>祭<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>᫮ <EFBFBD><EFBFBD> <EFBFBD>६<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    rep     movsb
    jmp     loc_clear_stack

loc_not_integer:
    mov     eax,10h
    sub     eax,[digits_count]

    ; <EFBFBD>८<EFBFBD>ࠧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>᫮ <EFBFBD> 楫<EFBFBD><EFBFBD> <EFBFBD><EFBFBD> 16 ࠧ<EFBFBD>冷<EFBFBD>
    mov     ecx,eax
    cmp     eax,0
    jge     @f
    neg     eax
@@:
    ; <EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>ᥫ <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 0 <EFBFBD><EFBFBD><EFBFBD>४<EFBFBD><EFBFBD>஢<EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>㣫<EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD> <EFBFBD><EFBFBD><EFBFBD>஭<EFBFBD> 0
    mov     [new_cw],0000101001111111b
    cmp     ecx,0
    jge     @f
    mov     [new_cw],0000011001111111b
@@:
    ; <EFBFBD><EFBFBD>⠭<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>ࠢ<EFBFBD><EFBFBD><EFBFBD>饥 ᫮<EFBFBD><EFBFBD>
    fldcw   [new_cw]

    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 10 <EFBFBD> <EFBFBD>⥯<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>⢠ <EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    fld     [float2]
    fld     [float2]
@@:
    fmul    st,st1
    dec     eax
    cmp     eax,1
    ja      @b

    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD>⥪
    fxch    st1
    fstp    st

    ; <EFBFBD>᫨ <EFBFBD><EFBFBD>᫮ <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 0, <EFBFBD><EFBFBD> 㬭<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>, <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> ࠧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    cmp     ecx,0
    jge     @f
    fdivp   st1,st
    jmp     loc_rounded
@@:
    fmulp   st1,st

loc_rounded:
    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD>祭<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>祭<EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 1.0e16 ?
    fcom    [float1]
    fstsw   ax
    test    ah,1
    jz      @f
    fmul    [float2]
    dec     [digits_count]
@@:
    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>᫮ <EFBFBD><EFBFBD><EFBFBD> <EFBFBD>஡<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD> <EFBFBD><EFBFBD>ᯮ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    lea     eax,[tmp1]
    fbstp   [eax]

    ; <EFBFBD><EFBFBD>ॢ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> BCD-<EFBFBD><EFBFBD>᫮ <EFBFBD> <EFBFBD><EFBFBD>ப<EFBFBD>
    push    edi
    lea     esi,[tmp1+8]
    lea     edi,[tmp2]
    mov     ecx, 9
@@:
    std
    xor     eax,eax
    lodsb
    cld
    rol     ax,12
    rol     ah,4
    add     ax,'00'
    stosw
    loop    @b
    pop     edi

    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD>ॡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD> <EFBFBD><EFBFBD>ᯮ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>?
    lea     esi,[tmp2+1]
    mov     ecx,[digits_count]
    cmp     ecx,-0Fh
    jl      loc_mantiss_and_exponent
    cmp     ecx,10h
    jg      loc_mantiss_and_exponent

    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD>஡<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>᫠
    inc     ecx
    cmp     ecx,0
    jg      @f
    mov     ax,'0.'
    stosw
    neg     ecx
    mov     al,'0'
    rep     stosb
    mov     ecx,10h
    jmp     loc_fraction_filled
@@:
    rep     movsb
    mov     al,'.'
    stosb
    mov     ecx,10h
    sub     ecx,[digits_count]

loc_fraction_filled:
    rep     movsb
    jmp     @f

loc_clear_fraction:
    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>騥 <EFBFBD>㫨 <EFBFBD>஡<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    dec     edi
@@:
    cmp     byte [edi-1],'0'
    jz      loc_clear_fraction
    cmp     byte [edi-1],'.'
    jnz     @f
    dec     edi
@@:
    jmp     loc_clear_stack

loc_mantiss_and_exponent:
    ; <EFBFBD>஡<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    movsb
    mov     al,'.'
    stosb
    movsd
    movsd
    movsw
    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>騥 <EFBFBD>㫨 <EFBFBD>஡<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
@@:
    cmp     byte [edi-1],'0'
    jne     @f
    cmp     byte [edi-2],'.'
    je      @f
    dec     edi
    jmp     @b
@@:
    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>ᯮ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    mov     al,'e'
    stosb
    mov     al,'+'
    mov     ebx,[digits_count]
    cmp     ebx, 0
    jge     @f
    mov     al,'-'
    neg     ebx
@@:
    stosb

    ; <EFBFBD><EFBFBD><EFBFBD>祭<EFBFBD><EFBFBD> <EFBFBD><EFBFBD>ᯮ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    mov     eax,ebx
    mov     ecx,10
    mov     ebx,4
@@:
    dec     ebx
    xor     edx,edx
    div     ecx
    add     dl,'0'
    mov     [tmp1+ebx],dl
    or      ebx,ebx
    jnz     @b

    ; <EFBFBD>ய<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>騥 <EFBFBD>㫨 <EFBFBD><EFBFBD>ᯮ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    mov     ecx,4
    lea     esi,[tmp1]
@@:
    lodsb
    cmp     al,'0'
    jne     @f
    dec     ecx
    jmp     @b
@@:
    dec     esi
    rep     movsb

loc_clear_stack:
    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD>⠭<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>ࠢ<EFBFBD><EFBFBD><EFBFBD>饥 ᫮<EFBFBD><EFBFBD>
    fldcw   [old_cw]
loc_ret:
    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD>砭<EFBFBD><EFBFBD> <EFBFBD><EFBFBD>ப<EFBFBD>
    mov     al,0
    stosb

    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD>⠭<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD> ॣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    popa
    ret

float1  dq      1.0e16
float2  dq      10.0

endp