1/* Copyright (c) 2007  Dmitry Xmelkov
2   All rights reserved.
3
4   Redistribution and use in source and binary forms, with or without
5   modification, are permitted provided that the following conditions are met:
6
7   * Redistributions of source code must retain the above copyright
8     notice, this list of conditions and the following disclaimer.
9   * Redistributions in binary form must reproduce the above copyright
10     notice, this list of conditions and the following disclaimer in
11     the documentation and/or other materials provided with the
12     distribution.
13   * Neither the name of the copyright holders nor the names of
14     contributors may be used to endorse or promote products derived
15     from this software without specific prior written permission.
16
17  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27  POSSIBILITY OF SUCH DAMAGE. */
28
29/* $Id: strcspn_P.S 2503 2016-02-07 22:59:47Z joerg_wunsch $ */
30
31#if !defined(__AVR_TINY__)
32
33#ifndef	__DOXYGEN__
34
35#include "macros.inc"
36
37#define str_lo	r24
38#define str_hi	r25
39#define acc_lo	r22
40#define acc_hi	r23
41
42#define chs	r21	/* char from s[]	*/
43
44	ASSEMBLY_CLIB_SECTION
45	.global _U(strcspn_P)
46	.type   _U(strcspn_P), @function
47
48_U(strcspn_P):
49	X_movw	XL, str_lo
50  ; get next symbol from s[]
511:	ld	chs, X+		; *s++
52	tst	chs
53	breq	3f
54  ; check an occurance
55	X_movw	ZL, acc_lo
562:	X_lpm	r0, Z+
57	cp	r0, chs
58	cpse	r0, __zero_reg__
59	brne	2b
60	brne	1b		; branch if chs is't present in reject[]
61  ; end of scanning: chs is found or end of s[] is reached
62  ; Return: X - 1 - str == X + ~str
633:	com	str_lo
64	com	str_hi
65	add	str_lo, XL
66	adc	str_hi, XH
67	ret
68
69	.size _U(strcspn_P), . - _U(strcspn_P)
70#endif	/* !__DOXYGEN__ */
71
72#endif /* !defined(__AVR_TINY__) */
73