File: strchr.S

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

#define src_hi r25
#define src_lo r24
; #define val_hi r23
#define val_lo r22

#define ret_hi r25
#define ret_lo r24

; char *strchr(const char *src, int val)

	.text
	.global	_U(strchr)
	.type	_U(strchr), @function
_U(strchr):
	LOAD_Z(src_lo, src_hi)
.strchr_loop:
	ld	__tmp_reg__, Z+
	cp	__tmp_reg__, val_lo
	breq	.strchr_found
	tst	__tmp_reg__
	brne	.strchr_loop
; not found, return NULL pointer
	clr	ret_lo
	clr	ret_hi
	ret
.strchr_found:
	sbiw	ZL, 1		; undo post-increment
	mov	ret_lo, ZL	; XXX use movw if available
	mov	ret_hi, ZH
	ret
.strchr_end:
	.size	_U(strchr), .strchr_end - _U(strchr)