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/* Copyright (c) 2006, Carlos Lamas
based on libc/pmstring/strlcpy_P.S which is
Copyright (c) 2003, Eric B. Weddington
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_PF.S 2191 2010-11-05 13:45:57Z arcanum $ */
/** \ingroup avr_pgmspace
\fn size_t strlcpy_PF (char *dst, uint_farptr_t src, size_t siz)
\brief Copy a string from progmem to RAM.
Copy src to string dst of size siz. At most siz-1 characters will be
copied. Always NULL terminates (unless siz == 0).
\returns The strlcpy_PF() function returns strlen(src). If retval >= siz,
truncation occurred. The contents of RAMPZ SFR are undefined when the
function returns */
#if !defined(__AVR_TINY__)
#if !defined(__DOXYGEN__)
#include "macros.inc"
#define dst_b1 r25
#define dst_b0 r24
#define src_b3 r23
#define src_b2 r22
#define src_b1 r21
#define src_b0 r20
#define siz_b1 r19
#define siz_b0 r18
#define rWord_b1 r25
#define rWord_b0 r24
.text
.global _U(strlcpy_PF)
.type _U(strlcpy_PF), @function
_U(strlcpy_PF):
X_movw ZL, src_b0 ; Z = src
LPM_R0_ZPLUS_INIT src_b2
X_movw XL, dst_b0 ; X = dst
cp siz_b0, __zero_reg__
cpc siz_b0, __zero_reg__ ; size == 0 ?
breq .L_strlcpy_PF_truncated
.L_strlcpy_PF_copy_loop: ; copy src to dst
subi siz_b0, lo8(1)
sbci siz_b1, hi8(1) ; decrement siz
breq 1f ; --> siz chars copied
LPM_R0_ZPLUS_NEXT src_b2 ; get next src char
st X+, r0 ; copy char
tst r0 ; end of src string ?
breq .L_strlcpy_PF_len ; --> all src chars copied
rjmp .L_strlcpy_PF_copy_loop ; next char
1: st X, __zero_reg__ ; truncate dst string
.L_strlcpy_PF_truncated: ; find Z = end of src string
LPM_R0_ZPLUS_NEXT src_b2 ; get next char from src
tst r0 ; end of src string ?
brne .L_strlcpy_PF_truncated ; next char
.L_strlcpy_PF_len: ; calculate strlen(src)
sub ZL, src_b0
sbc ZH, src_b1 ; Z points past \0
sbiw ZL, 1
X_movw rWord_b0, ZL
ret
.L_strlcpy_PF_end:
.size _U(strlcpy_PF), .L_strlcpy_PF_end - _U(strlcpy_PF)
#endif /* not __DOXYGEN__ */
#endif /* !defined(__AVR_TINY__) */
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