feat: isosceles_triangle

010-isosceles_triangle.s

@@ -0,0 +1,116 @@
+.global _start
+.intel_syntax noprefix
+.data
+	input:
+		.byte 0x00
+	new_line_collector:
+		.byte 0x00
+.text
+	_start:
+		//hello world
+		lea rsi, [text_hello_world]
+		mov rdx, 13
+		call printf
+
+		lea rsi, [text_how_far_do_you_want_to_go]
+		mov rdx, 28
+		call printf
+
+		lea rsi, [input]
+		mov rdx, 1
+		call scanf
+		sub input, byte ptr '0'
+		mov r8b, input
+		mov r12b, input
+		dec r12b
+		xor r9b, r9b
+				
+		upper:
+			cmp r9b, r8b
+			jae exit
+			mov r10b, r9b
+			add r10b, r10b
+			add r10b, 1
+			mov r13b, r12b
+			call print_spaces_of_the_line
+			call print_stars_of_the_line
+			call print_new_line
+			inc r9b
+			dec r12b
+			jmp upper
+						
+		//exit
+		exit:
+			lea rsi, [text_goodbye]
+			mov rdx, 9
+			call printf
+			mov rax, 60
+			xor rdi, rdi
+			syscall
+
+	text_hello_world:
+		.asciz "Hello World\n"
+	text_how_far_do_you_want_to_go:
+		.asciz "How Far Do You Want to Go = "
+	text_star:
+		.asciz "*"
+	text_space:
+		.asciz " "
+	text_new_line:
+		.asciz "\n"
+	text_goodbye:
+		.asciz "\nGoodbye\n"
+	print_spaces_of_the_line:
+		mov r11b, 0
+		cmp r11b, r13b
+		jae returner
+		call print_space
+		dec r13b
+		jmp print_spaces_of_the_line
+	
+	print_stars_of_the_line:
+		mov r11b, 0
+		cmp r11b, r10b
+		jae returner
+		call print_star
+		dec r10b
+		jmp print_stars_of_the_line
+		 
+	returner:
+		xor rdi, rdi
+		ret
+	print_star:
+		lea rsi, [text_star]
+		mov rdx, 1
+		call printf
+		xor rdi, rdi
+		ret
+	print_space:
+		lea rsi, [text_space]
+		mov rdx, 1
+		call printf
+		xor rdi, rdi
+		ret
+	print_new_line:
+		lea rsi, [text_new_line]
+		mov rdx, 1
+		call printf
+		xor rdi, rdi
+		ret
+	printf:
+		mov rax, 1
+		mov rdi, 1
+		syscall
+		xor rdi, rdi
+		ret
+	scanf:
+		mov rax, 0
+		mov rdi, 0
+		syscall
+		mov rax, 0
+		mov rdi, 0
+		mov rsi, [new_line_collector]
+		mov rdx, 1
+		syscall
+		xor rdi, rdi
+		ret