Adds bin2str() and printf() format specifier %b

src/convert.asm

@@ -1,12 +1,13 @@
 %include "src/constants.asm"
 
 section .bss
-	cnvtBuff	resb	21
-	cnvtBuffRev	resb	21
+	cnvtBuff	resb	67
+	cnvtBuffRev	resb	67
 section .text
 	global	dec2str
 	global	udec2str
 	global	hex2str
+	global	bin2str
 
 ;----- dec2str(int) -----;
 ; Converts a signed integer to a string (decimal output)
@@ -176,3 +177,52 @@ hex2str:
 	.quit:
 	lea	rax, [rel cnvtBuff]
 	ret
+
+;----- bin2str(uint) -----;
+; Converts an unsigned integer to a string (binary output)
+; Return value: Pointer to string containing the converted integer
+; Used registers:
+;	rax*	uint stored for div >> (ret) pointer to cnvtBuff[]
+;	rcx*	Counts length of created string
+;	rdx*	modulo as calculated by div >> character storage for cnvtBuff
+;	rdi*	(arg) integer to convert to string
+;	rsi*	Points to cnvtBuff for writing characters
+;	r8*	Dividor for div
+bin2str:
+	lea	rsi, [rel cnvtBuffRev]
+	test	rdi, rdi
+	jnz	.notZero
+	lea	rsi, [rel cnvtBuff]
+	mov	word [rsi], '0b'
+	mov	byte [rsi + 2], '0'
+	mov	byte [rsi + 3], EOS
+	jmp	.quit
+
+	.notZero:
+	mov	rax, rdi
+	xor	rcx, rcx
+	.convert:
+		xor	rdx, rdx
+		mov	r8, 2
+		div	r8
+		add	rdx, '0'
+		mov	[rsi], dl
+		inc	rsi
+		inc	rcx
+		test	rax, rax
+		jnz	.convert
+	mov	word [rsi], 'b0'
+	add	rcx, 2
+	inc	rsi
+	lea	rdi, [rel cnvtBuff]
+	.makeStringLoop:
+		mov	al, [rsi]
+		mov	[rdi], al
+		inc	rdi
+		dec	rsi
+		loop	.makeStringLoop
+	mov	byte [rdi], EOS
+
+	.quit:
+	lea	rax, [rel cnvtBuff]
+	ret