Initial commit

8 files changed, 773 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..ddcbcba
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,13 @@
+ASM = nasm
+ASMFLAGS = -f elf
+
+BUILDFLAGS = -m elf_i386
+
+%.o: %.asm
+	$(ASM) $(ASMFLAGS) $<
+
+OBJMODULES = string_conversion.o validations.o compute_functions.o number_conversion.o \
+	trigonometric_table.o
+
+trigonometric_table: $(OBJMODULES)
+	$(LD) $(BUILDFLAGS) $^ -o $@
diff --git a/compute_functions.asm b/compute_functions.asm
new file mode 100644
index 0000000..339742a
--- /dev/null
+++ b/compute_functions.asm
@@ -0,0 +1,44 @@
+global compute
+
+section .text
+
+;
+; calculating functions (sine, cosine, tangent, catangent)
+; [ebp+8] is integer angle
+; [ebp+12] is pointer to sine buffer
+; [ebp+16] is pointer to cosine buffer
+; [ebp+20] is pointer to tangent buffer
+; [ebp+24] is pointer to catangent buffer
+;
+compute:	push ebp
+		mov ebp, esp
+		sub esp, 4
+		mov dword [ebp-4], 180
+		finit
+		fild dword [ebp+8]
+		fldpi
+		fmulp
+		fild dword [ebp-4]
+		fdivp
+		fld st0				; copy radian angle
+		fsin
+		mov eax, [ebp+12]
+		fstp dword [eax]		; extract sin
+		fld st0
+		fcos
+		mov eax, [ebp+16]
+		fstp dword [eax]		; extract cos
+		mov eax, [ebp+20]		; check tang
+		cmp dword [eax], 0ffffffffh	; undefined value
+		je .skip
+		fptan
+		fxch
+		fst dword [eax]			; extract tang
+.skip:		mov eax, [ebp+24]
+		cmp dword [eax], 0ffffffffh
+		je .quit
+		fdivp				; ctng
+		fstp dword [eax]		; extract ctng
+.quit:		mov esp, ebp
+		pop ebp
+		ret
diff --git a/macro.inc b/macro.inc
new file mode 100644
index 0000000..4253947
--- /dev/null
+++ b/macro.inc
@@ -0,0 +1,72 @@
+%macro	get_arg 0
+		add esi, 4
+		mov edi, [esi]
+%endmacro
+%macro	write_value 0
+		mov edx, eax		; count
+		mov eax, 4		; syscall write
+		mov ebx, [f_discr]
+		mov ecx, buffer
+		int 80h
+%endmacro
+%macro	new_line 0
+		mov eax, 4
+		mov ebx, [f_discr]
+		mov ecx, nlstr
+		mov edx, 1
+		int 80h
+%endmacro
+%macro	vertical 0
+		mov eax, 4
+		mov ebx, [f_discr]
+		mov ecx, vert_sep
+		mov edx, 3
+		int 80h
+%endmacro
+%macro	border 0
+		mov eax, 4
+		mov ebx, [f_discr]
+		mov ecx, some_spaces
+		mov edx, 2
+		int 80h
+		mov eax, 4
+		mov ebx, [f_discr]
+		mov ecx, border_sep
+		mov edx, 53
+		int 80h
+		mov eax, 4
+		mov ebx, [f_discr]
+		mov ecx, some_spaces
+		mov edx, 2
+		int 80h
+%endmacro
+%macro	horizontal 0
+		mov eax, 4
+		mov ebx, [f_discr]
+		mov ecx, beg_sep
+		mov edx, 2
+		int 80h
+		mov eax, 4
+		mov ebx, [f_discr]
+		mov ecx, hor_sep
+		mov edx, hor_length
+		int 80h
+		mov eax, 4
+		mov ebx, [f_discr]
+		mov ecx, end_sep
+		mov edx, 2
+		int 80h
+%endmacro
+%macro	placeholder 0
+		mov eax, 4
+		mov ebx, [f_discr]
+		mov ecx, some_spaces
+		int 80h
+%endmacro
+%macro	undefined 0
+		mov eax, 4
+		mov ebx, [f_discr]
+		mov ecx, undef_value
+		mov edx, 1
+		int 80h
+%endmacro
diff --git a/number_conversion.asm b/number_conversion.asm
new file mode 100644
index 0000000..af6452f
--- /dev/null
+++ b/number_conversion.asm
@@ -0,0 +1,132 @@
+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
+
diff --git a/result.txt b/result.txt
new file mode 100644
index 0000000..cfbf364
--- /dev/null
+++ b/result.txt
@@ -0,0 +1,149 @@
+  -----------------------------------------------------  
+ | deg |       sin |       cos |       tan |       ctg |
+ |-----------------------------------------------------|
+ |   0 |         0 |         1 |         0 |         - | 
+ |-----------------------------------------------------|
+ |   5 |   0.08715 |   0.99619 |   0.08748 |  11.43005 | 
+ |-----------------------------------------------------|
+ |  10 |   0.17364 |   0.98480 |   0.17632 |   5.67128 | 
+ |-----------------------------------------------------|
+ |  15 |   0.25881 |   0.96592 |   0.26794 |   3.73205 | 
+ |-----------------------------------------------------|
+ |  20 |   0.34202 |   0.93969 |   0.36397 |   2.74747 | 
+ |-----------------------------------------------------|
+ |  25 |   0.42261 |   0.90630 |   0.46630 |   2.14450 | 
+ |-----------------------------------------------------|
+ |  30 |       0.5 |   0.86602 |   0.57735 |   1.73205 | 
+ |-----------------------------------------------------|
+ |  35 |   0.57357 |   0.81915 |   0.70020 |   1.42814 | 
+ |-----------------------------------------------------|
+ |  40 |   0.64278 |   0.76604 |   0.83909 |   1.19175 | 
+ |-----------------------------------------------------|
+ |  45 |   0.70710 |   0.70710 |         1 |         1 | 
+ |-----------------------------------------------------|
+ |  50 |   0.76604 |   0.64278 |   1.19175 |   0.83909 | 
+ |-----------------------------------------------------|
+ |  55 |   0.81915 |   0.57357 |   1.42814 |   0.70020 | 
+ |-----------------------------------------------------|
+ |  60 |   0.86602 |       0.5 |   1.73205 |   0.57735 | 
+ |-----------------------------------------------------|
+ |  65 |   0.90630 |   0.42261 |   2.14450 |   0.46630 | 
+ |-----------------------------------------------------|
+ |  70 |   0.93969 |   0.34202 |   2.74747 |   0.36397 | 
+ |-----------------------------------------------------|
+ |  75 |   0.96592 |   0.25881 |   3.73205 |   0.26794 | 
+ |-----------------------------------------------------|
+ |  80 |   0.98480 |   0.17364 |   5.67128 |   0.17632 | 
+ |-----------------------------------------------------|
+ |  85 |   0.99619 |   0.08715 |  11.43005 |   0.08748 | 
+ |-----------------------------------------------------|
+ |  90 |         1 |  -0.00000 |         - |        -0 | 
+ |-----------------------------------------------------|
+ |  95 |   0.99619 |  -0.08715 | -11.43005 |  -0.08748 | 
+ |-----------------------------------------------------|
+ | 100 |   0.98480 |  -0.17364 |  -5.67128 |  -0.17632 | 
+ |-----------------------------------------------------|
+ | 105 |   0.96592 |  -0.25881 |  -3.73205 |  -0.26794 | 
+ |-----------------------------------------------------|
+ | 110 |   0.93969 |  -0.34202 |  -2.74747 |  -0.36397 | 
+ |-----------------------------------------------------|
+ | 115 |   0.90630 |  -0.42261 |  -2.14450 |  -0.46630 | 
+ |-----------------------------------------------------|
+ | 120 |   0.86602 |      -0.5 |  -1.73205 |  -0.57735 | 
+ |-----------------------------------------------------|
+ | 125 |   0.81915 |  -0.57357 |  -1.42814 |  -0.70020 | 
+ |-----------------------------------------------------|
+ | 130 |   0.76604 |  -0.64278 |  -1.19175 |  -0.83909 | 
+ |-----------------------------------------------------|
+ | 135 |   0.70710 |  -0.70710 |        -1 |        -1 | 
+ |-----------------------------------------------------|
+ | 140 |   0.64278 |  -0.76604 |  -0.83909 |  -1.19175 | 
+ |-----------------------------------------------------|
+ | 145 |   0.57357 |  -0.81915 |  -0.70020 |  -1.42814 | 
+ |-----------------------------------------------------|
+ | 150 |       0.5 |  -0.86602 |  -0.57735 |  -1.73205 | 
+ |-----------------------------------------------------|
+ | 155 |   0.42261 |  -0.90630 |  -0.46630 |  -2.14450 | 
+ |-----------------------------------------------------|
+ | 160 |   0.34202 |  -0.93969 |  -0.36397 |  -2.74747 | 
+ |-----------------------------------------------------|
+ | 165 |   0.25881 |  -0.96592 |  -0.26794 |  -3.73205 | 
+ |-----------------------------------------------------|
+ | 170 |   0.17364 |  -0.98480 |  -0.17632 |  -5.67128 | 
+ |-----------------------------------------------------|
+ | 175 |   0.08715 |  -0.99619 |  -0.08748 | -11.43005 | 
+ |-----------------------------------------------------|
+ | 180 |  -0.00000 |        -1 |   0.00000 |         - | 
+ |-----------------------------------------------------|
+ | 185 |  -0.08715 |  -0.99619 |   0.08748 |  11.43005 | 
+ |-----------------------------------------------------|
+ | 190 |  -0.17364 |  -0.98480 |   0.17632 |   5.67128 | 
+ |-----------------------------------------------------|
+ | 195 |  -0.25881 |  -0.96592 |   0.26794 |   3.73205 | 
+ |-----------------------------------------------------|
+ | 200 |  -0.34202 |  -0.93969 |   0.36397 |   2.74747 | 
+ |-----------------------------------------------------|
+ | 205 |  -0.42261 |  -0.90630 |   0.46630 |   2.14450 | 
+ |-----------------------------------------------------|
+ | 210 |      -0.5 |  -0.86602 |   0.57735 |   1.73205 | 
+ |-----------------------------------------------------|
+ | 215 |  -0.57357 |  -0.81915 |   0.70020 |   1.42814 | 
+ |-----------------------------------------------------|
+ | 220 |  -0.64278 |  -0.76604 |   0.83909 |   1.19175 | 
+ |-----------------------------------------------------|
+ | 225 |  -0.70710 |  -0.70710 |         1 |         1 | 
+ |-----------------------------------------------------|
+ | 230 |  -0.76604 |  -0.64278 |   1.19175 |   0.83909 | 
+ |-----------------------------------------------------|
+ | 235 |  -0.81915 |  -0.57357 |   1.42814 |   0.70020 | 
+ |-----------------------------------------------------|
+ | 240 |  -0.86602 |      -0.5 |   1.73205 |   0.57735 | 
+ |-----------------------------------------------------|
+ | 245 |  -0.90630 |  -0.42261 |   2.14450 |   0.46630 | 
+ |-----------------------------------------------------|
+ | 250 |  -0.93969 |  -0.34202 |   2.74747 |   0.36397 | 
+ |-----------------------------------------------------|
+ | 255 |  -0.96592 |  -0.25881 |   3.73205 |   0.26794 | 
+ |-----------------------------------------------------|
+ | 260 |  -0.98480 |  -0.17364 |   5.67128 |   0.17632 | 
+ |-----------------------------------------------------|
+ | 265 |  -0.99619 |  -0.08715 |  11.43005 |   0.08748 | 
+ |-----------------------------------------------------|
+ | 270 |        -1 |   0.00000 |         - |        -0 | 
+ |-----------------------------------------------------|
+ | 275 |  -0.99619 |   0.08715 | -11.43005 |  -0.08748 | 
+ |-----------------------------------------------------|
+ | 280 |  -0.98480 |   0.17364 |  -5.67128 |  -0.17632 | 
+ |-----------------------------------------------------|
+ | 285 |  -0.96592 |   0.25881 |  -3.73205 |  -0.26794 | 
+ |-----------------------------------------------------|
+ | 290 |  -0.93969 |   0.34202 |  -2.74747 |  -0.36397 | 
+ |-----------------------------------------------------|
+ | 295 |  -0.90630 |   0.42261 |  -2.14450 |  -0.46630 | 
+ |-----------------------------------------------------|
+ | 300 |  -0.86602 |       0.5 |  -1.73205 |  -0.57735 | 
+ |-----------------------------------------------------|
+ | 305 |  -0.81915 |   0.57357 |  -1.42814 |  -0.70020 | 
+ |-----------------------------------------------------|
+ | 310 |  -0.76604 |   0.64278 |  -1.19175 |  -0.83909 | 
+ |-----------------------------------------------------|
+ | 315 |  -0.70710 |   0.70710 |        -1 |        -1 | 
+ |-----------------------------------------------------|
+ | 320 |  -0.64278 |   0.76604 |  -0.83909 |  -1.19175 | 
+ |-----------------------------------------------------|
+ | 325 |  -0.57357 |   0.81915 |  -0.70020 |  -1.42814 | 
+ |-----------------------------------------------------|
+ | 330 |      -0.5 |   0.86602 |  -0.57735 |  -1.73205 | 
+ |-----------------------------------------------------|
+ | 335 |  -0.42261 |   0.90630 |  -0.46630 |  -2.14450 | 
+ |-----------------------------------------------------|
+ | 340 |  -0.34202 |   0.93969 |  -0.36397 |  -2.74747 | 
+ |-----------------------------------------------------|
+ | 345 |  -0.25881 |   0.96592 |  -0.26794 |  -3.73205 | 
+ |-----------------------------------------------------|
+ | 350 |  -0.17364 |   0.98480 |  -0.17632 |  -5.67128 | 
+ |-----------------------------------------------------|
+ | 355 |  -0.08715 |   0.99619 |  -0.08748 | -11.43005 | 
+ |-----------------------------------------------------|
+ | 360 |   0.00000 |         1 |   0.00000 |         - | 
+  -----------------------------------------------------  
diff --git a/string_conversion.asm b/string_conversion.asm
new file mode 100644
index 0000000..1cef531
--- /dev/null
+++ b/string_conversion.asm
@@ -0,0 +1,40 @@
+global to_int
+
+section .text
+
+;
+; angle translation from string to integer
+; [ebp+8] is pointer to string
+; eax=-1 if digit is not 0-9
+; else eax=number
+;
+to_int:		push ebp
+		mov ebp, esp
+		sub esp, 8		; local variables
+		push esi		; save esi
+		mov dword [ebp-4], 0	; init number
+		mov dword [ebp-8], 10	; init const
+		mov esi, [ebp+8]	; buffer
+		cld
+.lp:		lodsb
+		cmp al, 0
+		je .store
+		cmp al, '0'
+		jl .error
+		cmp al, '9'
+		jg .error
+		sub al, '0'
+		xor ecx, ecx
+		xchg al, cl
+		mov eax, [ebp-4]
+		mul dword [ebp-8]
+		add eax, ecx
+		mov [ebp-4], eax
+		jmp .lp
+.error:		mov eax, -1
+		jmp .quit
+.store:		mov eax, [ebp-4]
+.quit:		pop esi
+		mov esp, ebp
+		pop ebp
+		ret
diff --git a/trigonometric_table.asm b/trigonometric_table.asm
new file mode 100644
index 0000000..d596204
--- /dev/null
+++ b/trigonometric_table.asm
@@ -0,0 +1,249 @@
+%include "macro.inc"
+
+global _start
+extern result_to_string
+extern compute
+extern input_to_string
+extern check_angle
+extern check_tangent
+extern check_cotanget
+extern to_int
+
+section .text
+
+;
+; MAIN PROGRAM
+;
+_start:		pop ebx			; length of args
+		cmp ebx, 5
+		jne .arg_error
+		mov esi, esp
+		get_arg			; file name
+		mov [f_name], edi
+		get_arg 		; start angle
+		push edi
+		call to_int
+		add esp, 4
+		cmp eax, -1
+		je .arg_error
+		mov [beg_angle], eax
+		get_arg 		; finish angle
+		push edi
+		call to_int
+		add esp, 4
+		cmp eax, -1
+		je .arg_error
+		mov [end_angle], eax
+		get_arg			; step
+		push edi
+		call to_int
+		add esp, 4
+		cmp eax, -1
+		je .arg_error
+		mov [step], eax
+		push dword [beg_angle]
+		push dword [end_angle]
+		call check_angle
+		add esp, 8
+		cmp eax, 0
+		je .angle_error
+		cmp eax, -1
+		je .greater_error
+		mov eax, 5
+		mov ebx, [f_name]
+		mov ecx, 241h		; open file
+		mov edx, 0666q		; rights
+		int 80h
+		mov ecx, eax
+		and ecx, 0fffff000h
+		cmp ecx, 0fffff000h
+		je .open_error
+		mov [f_discr], eax
+		border
+		new_line
+		mov eax, 4
+		mov ebx, [f_discr]
+		mov ecx, title
+		mov edx, title_len
+		int 80h
+		new_line
+		mov esi, [beg_angle]
+.lp:		cmp esi, [end_angle]
+		jg .quit
+		horizontal
+		vertical
+		push buffer
+		push esi
+		call input_to_string    ; for print input angle
+		add esp, 8
+		push ecx		; save ecx
+		push eax		; save eax
+		mov eax, 3
+		sub eax, ecx
+		cmp ecx, 0
+		je .skip
+		mov edx, eax		; indent
+		placeholder
+.skip:		pop eax
+		pop ecx
+		mov edx, ecx		; count
+		mov ecx, eax		; address of string
+		mov eax, 4		; write angle
+		mov ebx, [f_discr]
+		int 80h
+		vertical
+		push dword tan_value
+		push esi
+		call check_tangent
+		add esp, 8
+		push dword ctg_value
+		push esi
+		call check_cotanget
+		add esp, 8
+		push dword ctg_value  ; pointer to catangent buffer
+		push dword tan_value  ; pointer to tangent buffer
+		push dword cos_value  ; pointer to cosine buffer
+		push dword sin_value  ; pointer to sine buffer
+		push esi	      ; angle
+		call compute
+		add esp, 20
+		push buffer
+		push dword [sin_value]
+		call result_to_string
+		add esp, 8
+		mov edx, 9
+		sub edx, eax            ; indent
+		cmp edx, 0
+		je .print_sin
+		push eax		; save length
+		placeholder
+		pop eax
+.print_sin:	write_value
+		vertical
+		push buffer
+		push dword [cos_value]
+		call result_to_string
+		add esp, 8
+		mov edx, 9
+		sub edx, eax            ; indent
+		cmp edx, 0
+		je .print_cos
+		push eax
+		placeholder
+		pop eax
+.print_cos:	write_value
+		vertical
+		cmp dword [tan_value], 0ffffffffh
+		jne .tan
+		mov edx, 8				; placeholder length
+		placeholder
+		undefined
+		vertical
+		jmp .cmp_ctg
+.tan:		push buffer
+		push dword [tan_value]
+		call result_to_string
+		add esp, 8
+		mov edx, 9
+		sub edx, eax            ; indent
+		cmp edx, 0
+		je .print_tan
+		push eax
+		placeholder
+		pop eax
+.print_tan:	write_value
+		vertical
+.cmp_ctg:	cmp dword [ctg_value], 0ffffffffh
+		jne .ctg
+		mov edx, 8
+		placeholder
+		undefined
+		vertical
+		jmp .nl
+.ctg:		push buffer
+		push dword [ctg_value]
+		call result_to_string
+		add esp, 8
+		mov edx, 9
+		sub edx, eax            ; indent
+		cmp edx, 0
+		je .print_ctg
+		push eax
+		placeholder
+		pop eax
+.print_ctg:	write_value
+		vertical
+.nl:		new_line
+                cmp byte [step], 0
+                je .quit
+		add esi, [step]         ; next step
+		jmp .lp
+.arg_error:	mov eax, 4
+		mov ebx, 1
+		mov ecx, err1msg
+		mov edx, err1len
+		int 80h
+		jmp .exit_code
+.angle_error:	mov eax, 4
+		mov ebx, 1
+		mov ecx, err2msg
+		mov edx, err2len
+		int 80h
+		jmp .exit_code
+.greater_error:	mov eax, 4
+		mov ebx, 1
+		mov ecx, err3msg
+		mov edx, err3len
+		int 80h
+		jmp .exit_code
+.open_error:	mov eax, 4
+		mov ebx, 1
+		mov ecx, err4msg
+		mov edx, err4len
+		int 80h
+.exit_code:	mov eax, 1
+		mov ebx, 1
+		int 80h
+.quit:		border
+		new_line
+		mov eax, 6		; close file
+		mov ebx, [f_discr]
+		int 80h
+		mov eax, 1		; finish
+		mov ebx, 0
+		int 80h
+
+section .bss
+
+f_name		resd	1
+f_discr 	resd	1
+beg_angle	resd	1
+end_angle	resd	1
+step		resd	1
+sin_value	resd	1
+cos_value	resd	1
+tan_value	resd	1
+ctg_value	resd	1
+buffer		resb	8
+
+section .data
+
+err1msg		db 	"Usage <name file> <start angle> <end angle> <step>", 10
+err1len		equ	$-err1msg
+err2msg		db	"Angle must be from 0 to 360", 10
+err2len		equ	$-err2msg
+err3msg		db	"Start angle is incorrectly entered", 10
+err3len		equ	$-err3msg
+err4msg		db	"Couldn't open source file", 10
+err4len		equ	$-err4msg
+nlstr		db	10
+vert_sep	db	" | "
+beg_sep		db	" |"
+end_sep		db	'|', 10
+hor_sep		times	53	db	'-'
+hor_length	equ	$-hor_sep
+border_sep	times	53	db	'-'
+some_spaces	times 	8 	db 	' '
+undef_value	db	'-'
+title		db	" | deg |       sin |       cos |       tan |       ctg |"
+title_len	equ	$-title
diff --git a/validations.asm b/validations.asm
new file mode 100644
index 0000000..12c8e26
--- /dev/null
+++ b/validations.asm
@@ -0,0 +1,74 @@
+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