section	.text
	global	min
	global	minu
	global	max
	global	maxu
	global	islower
	global	isupper
	global	tolower
	global	toupper

;----- min(int a, int b) -----;
; return value: lowest value
min:
	push	rbp
	mov	rbp, rsp

	mov	rax, rdi
	cmp	rdi, rsi
	cmovg	rax, rsi

	leave
	ret
;----- minu(unsigned int a, unsigned int b) -----;
; return value: lowest value
minu:
	push	rbp
	mov	rbp, rsp

	mov	rax, rdi
	cmp	rdi, rsi
	cmova	rax, rsi

	leave
	ret
;----- max(int a, int b) -----;
; return value: highest value
max:
	push	rbp
	mov	rbp, rsp

	mov	rax, rdi
	cmp	rdi, rsi
	cmovl	rax, rsi

	leave
	ret
;----- maxu(unsigned int a, unsigned int b) -----;
; return value: highest value
maxu:
	push	rbp
	mov	rbp, rsp

	mov	rax, rdi
	cmp	rdi, rsi
	cmovb	rax, rsi

	leave
	ret
;----- islower(char* c) -----;
; return value: 1 (character is in range of 'a'-'z') or 0 (character is nog in range of 'a'-'z')
islower:
	push	rbp
	mov	rbp, rsp

	xor	rax, rax
	cmp	byte [rdi], 'a'
	jb	.quit
	cmp	byte [rdi], 'z'
	ja	.quit
	mov	rax, 1

	.quit:
	leave
	ret
;----- isupper(char* c) -----;
; return value: 1 (character is in range of 'A'-'Z') or 0 (character is not in range of 'A'-'Z')
isupper:
	push	rbp
	mov	rbp, rsp

	xor	rax, rax
	cmp	byte [rdi], 'A'
	jb	.quit
	cmp	byte [rdi], 'Z'
	ja	.quit
	mov	rax, 1

	.quit:
	leave
	ret
;----- tolower(char* c) -----;
; return value: ASCII value. Same as original if it was not an uppercase letter, otherwise lowercase letter
tolower:
	push	rbp
	mov	rbp, rsp

	call	isupper
	mov	rcx, rax
	mov	al, byte [rdi]
	cmp	rcx, 1
	jne	.quit
	add	al, 32

	.quit:
	leave
	ret
;----- toupper(char* c) -----;
; return value: ASCII value. Same as original if it was not a lowercase letter, otherwise uppercase letter
toupper:
	push	rbp
	mov	rbp, rsp

	call	islower
	mov	rcx, rax
	mov	al, byte [rdi]
	cmp	rcx, 1
	jne	.quit
	sub	al, 32

	.quit:
	leave
	ret