File: strcat.S

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avr-libc 20020203-2
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#include "macros.inc"

#define dest_hi r25
#define dest_lo r24
#define src_hi r23
#define src_lo r22

; char *strcat(char *dest, const char *src)

	.text
	.global	_U(strcat)
	.type	_U(strcat), @function
_U(strcat):
	LOAD_Z(src_lo, src_hi)
	LOAD_X(dest_lo, dest_hi)
.strcat_skip:
	ld	__tmp_reg__, X+
	tst	__tmp_reg__
	brne	.strcat_skip
	sbiw	XL, 1		; undo post-increment
.strcat_loop:
	ld	__tmp_reg__, Z+
	st	X+, __tmp_reg__
	tst	__tmp_reg__
	brne	.strcat_loop
; return dest (unchanged)
	ret
.strcat_end:
	.size	_U(strcat), .strcat_end - _U(strcat)