min[u](),max[u](),islower(),isupper(),print(),puts(),strlen(),strcpy(),strcat()

core.asm

@@ -0,0 +1,96 @@
+section	.text
+	global	min
+	global	minu
+	global	max
+	global	maxu
+	global	islower
+	global	isupper
+
+;----- min(int a, int b) -----;
+; return value: lowest value
+min:
+	push	rbp
+	mov	rbp, rsp
+
+	mov	rax, rdi
+	cmp	rdi, rsi
+	jl	.quit
+	mov	rax, rsi
+
+	.quit:
+	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
+	jb	.quit
+	mov	rax, rsi
+
+	.quit:
+	leave
+	ret
+;----- max(int a, int b) -----;
+; return value: highest value
+max:
+	push	rbp
+	mov	rbp, rsp
+
+	mov	rax, rdi
+	cmp	rdi, rsi
+	jg	.quit
+	mov	rax, rsi
+
+	.quit:
+	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
+	ja	.quit
+	mov	rax, rsi
+
+	.quit:
+	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