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global result_to_string
global input_to_string
;
;local variables of result_to_string
;
%define ten ebp-4
%define count ebp-8
%define digit ebp-12
section .text
;
; converts float number to string
; [ebp+8] is value of sine/cosine/tangent/cotangent
; [ebp+12] is pointer to buffer
; returns eax is string size
;
result_to_string:
push ebp
mov ebp, esp
sub esp, 12 ; memory allocation
mov dword [ten], 10
mov dword [count], 0
mov edi, [ebp+12] ; string address
cld
finit
fld dword [ebp+8] ; load number
ftst ; compare with 0.0
fstsw ax ; save flags
sahf ; load flags
jnc .positiv
mov al, '-'
stosb
inc dword [count]
fchs ; modulus
.positiv: fld1 ; load 1
fld st1 ; copy number to top
fprem ; fraction part
fsub st2, st0 ; integer
fxch st2
xor ecx, ecx ; count for integer part
.lp1: fidiv dword [ten] ; number /10
fxch st1 ; st0 = 1, st1 = number
fld st1 ; st0 = number, st1 = 1, st2 = number
fprem
fsub st2, st0 ; number - fract
fimul dword [ten] ; 0,fraction * 10
fistp dword [digit]
push dword [digit] ; save integer part
inc ecx ; increment integer count
inc dword [count] ; incement total count
fxch st1 ; st0 = number, st1 = 1
ftst ; integer part = 0.0
fstsw ax
sahf
jne .lp1
.extract: pop eax
add al, '0'
stosb
loop .extract
fstp st0 ; remove integer part
fxch st1 ; st0 = fraction part, st1 = 1
ftst ; compare with 0.0
fstsw ax
sahf
je .quit
mov al, '.'
stosb
inc dword [count]
mov ecx, 5 ; length fract part
.lp2: fimul dword [ten]
fxch st1 ; st0 = 1, st1 = number
fld st1 ; st0 = number, st1 = 1, st2 = number
fprem
fsub st2, st0 ; st2 = integer part
fxch st2 ; st0 = int part, st1 = 1, st2 = frac
fistp dword [digit] ; st0 = 1, st1 = frac
mov al, [digit]
add al, '0'
stosb
inc dword [count]
fxch st1 ; st0 = number, st1 = 1
ftst
fstsw ax
sahf
je .quit ; number = 0.0
loop .lp2 ; else reduce ecx
.quit: ffree st0 ; clear stack
fincstp
ffree st0
fincstp
mov eax, [count] ; return count
mov esp, ebp
pop ebp
ret
;
; angle translation from integer to string
; [ebp+8] is number
; [ebp+12] is pointer to buffer
; return eax is pointer to the beggining of string
; and ecx is character count
;
input_to_string:
push ebp
mov ebp, esp
sub esp, 4
push edi
mov dword [ebp-4], 10
xor ecx, ecx ; count
mov edi, [ebp+12] ; buffer
add edi, 7 ; by the end of buffer
std ; from right to left
mov eax, [ebp+8] ; number
.lp: xor edx, edx
div dword [ebp-4]
xchg al, dl
add al, '0'
stosb
inc ecx
xchg al, dl
cmp eax, 0
jne .lp
mov eax, edi ; address of string
inc eax
pop edi
mov esp, ebp
pop ebp
ret
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