FIX: No longer allow exceeding printf buffer, instead print an error to stdout. Temporary fix

Later, if buffer is full, print current buffer and reset buffer so that there is no limit.

console.asm

@@ -5,8 +5,11 @@ extern	itoa
 
 section .rodata
 	NL		db	0xA
+	bufferLength	equ	4096
+	ERR_buffLen	db	"<!> ERROR: Failed to complete printf(), reached buffer length!",0xA,0x0
+	lERR_buffLen	equ	$-ERR_buffLen-1
 section .bss
-	printfBuff	resb	4096
+	printfBuff	resb	bufferLength
 	printfNBuff	resb	32
 section .text
 	global	print
@@ -52,18 +55,25 @@ printf:
 	push	rbp
 	mov	rbp, rsp
 
-	push	r12
-	push	r13
+	push	rbx ; used to check if error must be sent (reached buff len)
+	push	r12 ; used for writing byted to printBuff
+	push	r13 ; (also) used for writing bytes to printBuff (why again? gotta check that out - probably not needed, just lost count of register usage at some point)
+	push	r14 ; count length of printBuff
 
+	xor	rbx, rbx
 	xor	r10, r10
+	xor	r14, r14
 	lea	r11, [rel printfBuff]
 	.makeStr:
 		cmp	byte [rdi], 0x0
 		je	.finish
+		cmp	r14, bufferLength-1
+		je	.finish_L
 		cmp	byte [rdi], '%'
 		je	.replaceArg
 		mov	r12b, byte [rdi]
 		mov	byte [r11], r12b
+		inc	r14
 		jmp	.continue
 		.replaceArg:
 			cmp	byte [rdi+1], 0x0
@@ -80,6 +90,7 @@ printf:
 			
 			;--- invalid specifier ---;
 			mov	byte [r11], '%'
+			inc	r14
 			inc	r10 ;assuming args were passed for invalid specifiers !
 			jmp	.continue
 
@@ -172,8 +183,15 @@ printf:
 
 			.charToStr:
 			mov	[printfNBuff], dil
+			inc	r14
+			cmp	r14, bufferLength-1
+			; Print error to stdout
+			je	.finish_L
 			mov	dil, 0
 			mov	[printfNBuff+1], dil
+			inc	r14
+			cmp	r14, bufferLength-1
+			je	.finish_L
 			lea	rsi, [rel printfNBuff]
 			jmp	.insertLoop
 
@@ -208,10 +226,13 @@ printf:
 
 			;--- Move fetched data to buffer ---;
 			.insertLoop:
+				cmp	r14, bufferLength-1
+				je	.finish_L
 				cmp	byte [rsi], 0x0
 				je	.s0f
 				mov	r13b, byte [rsi]
 				mov	byte [r11], r13b
+				inc	r14
 				inc	rsi
 				inc	r11
 				jmp	.insertLoop
@@ -224,15 +245,32 @@ printf:
 		inc	rdi
 		inc	r11
 		jmp	.makeStr
+	
+	.finish_L:
+	mov	rbx, 1
+
 	.finish:
 	mov	byte [r11], 0x0
 	lea	rdi, [rel printfBuff]
 	call	print
 	lea	rdi, [rel printfBuff]
 	call	strlen
+	test	rbx, rbx
+	jz	.final
 
+	push	r11
+	mov	rax, NR_write
+	mov	rdi, 2
+	lea	rsi, [rel ERR_buffLen]
+	mov	rdx, lERR_buffLen
+	syscall
+
+	.final:
+	pop	r11
+	pop	r14
 	pop	r13
 	pop	r12
+	pop	rbx
 
 	leave
 	ret