Optimize strnlen, strndup, and strdup

src/libc/strdup.src

@@ -3,35 +3,36 @@
 	section	.text
 	public	_strdup
 _strdup:
-	ld	hl,-3
-	call	__frameset
-	ld	bc,(ix+6)
-	push	bc
+	pop	de
+	ex	(sp), hl
+	push	de
+
+	push	hl
+
+	push	hl
 	call	_strlen
-	pop	bc
+	pop	de
+
 	inc	hl
+	push	hl
+
 	push	hl
 	call	_malloc
+	pop	de
+
 	pop	bc
-	ld	(ix+-3),hl
-	add	hl,de
-	or	a,a
-	sbc	hl,de
-	jr	z,MallocFail
-	ld	bc,(ix+6)
-	push	bc
-	ld	bc,(ix+-3)
-	push	bc
-	call	_strcpy
-	pop	bc
-	pop	bc
-MallocFail:
-	ld	hl,(ix+-3)
-	ld	sp,ix
-	pop	ix
+	pop	de
+
+	add	hl, bc
+	or	a, a
+	sbc	hl, bc
+	ret	z
+
+	push	hl
+	ex	de, hl
+	ldir
+	pop	hl
 	ret
 
-	extern	__frameset
-	extern	_malloc
 	extern	_strlen
-	extern	_strcpy
+	extern	_malloc

src/libc/strndup.src

@@ -3,46 +3,46 @@
 	section	.text
 	public	_strndup
 _strndup:
-	ld	hl,-6
-	call	__frameset
-	ld	bc,(ix+6)
-	push	bc
-	call	_strlen
-	ld	(ix+-3),hl
-	ex	de,hl
-	ld	hl,(ix+9)
-	or	a,a
-	sbc	hl,de
-	jr	nc,Greater
-	ld	hl,(ix+9)
-	ld	(ix+-3),hl
-Greater:
-	ld	bc,(ix+-3)
-	inc	bc
+	pop	bc
+	pop	de
+	ex	(sp),hl
+	push	de
 	push	bc
+
+	push	de
+
+	push	hl
+	push	de
+	call	_strnlen
+	pop	de
+	pop	de
+
+	inc	hl
+	push	hl
+
+	push	hl
 	call	_malloc
-	ld	(ix+-6),hl
-	add	hl,bc
-	or	a,a
-	sbc	hl,bc
-	jr	z,MallocFail
-	ld	bc,(ix+-3)
-	ld	hl,(ix+-6)
-	add	hl,bc
-	ld	(hl),0
-	or	a,a
-	sbc	hl,bc
-	push	bc
-	ld	bc,(ix+6)
-	push	bc
+	pop	de
+
+	pop	bc
+	pop	de
+
+	add	hl, bc
+	xor	a, a
+	sbc	hl, bc
+	ret	z
+
+	ld	(hl), a
+	cpi
+	dec	hl
+	ret	po
+
 	push	hl
-	call	_memcpy
-MallocFail:
-	ld	sp,ix
-	pop	ix
+	ex	de, hl
+	ldir
+	ld	(de), a
+	pop	hl
 	ret
 
-	extern	__frameset
-	extern	_strlen
+	extern	_strnlen
 	extern	_malloc
-	extern	_memcpy

src/libc/strnlen.src

@@ -3,13 +3,21 @@
 	section	.text
 	public	_strnlen
 _strnlen:
-	pop	hl,de,bc
-	push	bc,de,hl
-	push	de
 	pop	hl
-	xor	a,a
-	inc	bc
+	pop	de
+	pop	bc
+	push	bc
+	push	de
+	push	hl
+	xor	a, a
+	sbc	hl, hl
+	sbc	hl, bc
+	ret	z
+	add	hl, bc
+	sbc	hl, de
+	ex	de, hl
 	cpir
-	scf
-	sbc	hl,de
+	add	hl, de
+	ret	z
+	inc	hl
 	ret