1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/*
AVR LIBC
strlcpy()
Copyright (c) 2003, 2007 Eric B. Weddington, R. Patommel
Copyright (c) 2009 Dmitry Xmelkov
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
* Neither the name of the copyright holders nor the names of
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
/* $Id: strlcpy.S,v 1.5.2.2 2009/10/18 05:53:23 dmix Exp $ */
/** \file */
/** \ingroup avr_string
\fn size_t strlcpy (char *dst, const char *src, size_t siz)
\brief Copy a string.
Copy \p src to string \p dst of size \p siz. At most \p siz-1
characters will be copied. Always NULL terminates (unless \p siz == 0).
\returns The strlcpy() function returns strlen(src). If retval >= siz,
truncation occurred. */
#if !defined(__DOXYGEN__)
#include "asmdef.h"
#define dst_lo r24
#define src_hi r23
#define src_lo r22
#define siz_hi r21
#define siz_lo r20
#define rslt_lo r24
ENTRY strlcpy
X_movw XL, dst_lo ; X = dst
X_movw ZL, src_lo ; Z = src
; copy loop
1: subi siz_lo, lo8(1)
sbci siz_hi, hi8(1)
brcs 4f ; is possible with siz == 0
breq 3f ; --> siz chars copied
ld __tmp_reg__, Z+
st X+, __tmp_reg__
tst __tmp_reg__
brne 1b
; calculate result (Z - 1 - src) and return
2: sub ZL, src_lo
sbc ZH, src_hi
sbiw ZL, 1
X_movw rslt_lo, ZL
ret
; terminate dst
3: st X, __zero_reg__
; find src end
4: ld __tmp_reg__, Z+
tst __tmp_reg__
brne 4b
rjmp 2b
ENDFUNC
#endif /* not __DOXYGEN__ */
|
