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global check_angle
global check_tangent
global check_cotanget
section .text
;
; angle validation
; [ebp+8] is end angle
; [ebp+12] is begin angle
; returns eax=-1 if begin angle is greater than end angle
; eax=0 if end angle < 0 or > 360
; eax=1 if angles are correct
;
check_angle: push ebp
mov ebp, esp
mov eax, [ebp+8] ; end_angle
mov edx, [ebp+12] ; begin_angle
cmp edx, eax
jg .error2
cmp eax, 0
jl .error1
cmp eax, 360
jg .error1
mov eax, 1
jmp .quit
.error1: xor eax, eax
jmp .quit
.error2: mov eax, -1
.quit: pop ebp
ret
;
; tangent test
; [ebp+8] is integer angle
; [ebp+12] is pointer to tangent buffer
; buffer=ffffffffh if tangent=90 or 270
; else buffer=1
;
check_tangent: push ebp
mov ebp, esp
mov eax, [ebp+8] ; value
mov ecx, [ebp+12] ; address
mov dword [ecx], 1 ; true
cmp eax, 90
je .undefined
cmp eax, 270
je .undefined
jmp .quit
.undefined: mov dword [ecx], 0ffffffffh ; false (255)
.quit: pop ebp
ret
;
; cotangent test
; [ebp+8] is integer angle
; [ebp+12] is pointer to cotangent buffer
; buffer=ffffffffh if cotangent=0, 180 or 360
; else buffer=1
;
check_cotanget: push ebp
mov ebp, esp
mov eax, [ebp+8] ; value
mov ecx, [ebp+12] ; address
mov dword [ecx], 1 ; true
cmp eax, 0
je .undefined
cmp eax, 180
je .undefined
cmp eax, 360
je .undefined
jmp .quit
.undefined: mov dword [ecx], 0ffffffffh ; false (255)
.quit: pop ebp
ret
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