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/* Copyright (c) 2002, Marek Michalkiewicz
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. */
#include "macros.inc"
#define dest_hi r25
#define dest_lo r24
#define src_hi r23
#define src_lo r22
; #define val_hi r21
#define val_lo r20
#define len_hi r19
#define len_lo r18
#define ret_hi r25
#define ret_lo r24
/** \ingroup avr_string
\fn void *memccpy(void *dest, const void *src, int val, size_t len)
\brief Copy memory area.
The memccpy() function copies no more than len bytes from memory area src
to memory area dest, stopping when the character val is found.
\returns The memccpy() function returns a pointer to the next character in
dest after val, or NULL if val was not found in the first len characters
of src. */
#if !defined(DOXYGEN)
.text
.global _U(memccpy)
.type _U(memccpy), @function
_U(memccpy):
LOAD_Z(src_lo, src_hi)
LOAD_X(dest_lo, dest_hi)
.memccpy_loop:
subi len_lo, lo8(1)
sbci len_hi, hi8(1)
brcs .memccpy_notfound
ld __tmp_reg__, Z+
st X+, __tmp_reg__
cp __tmp_reg__, val_lo
brne .memccpy_loop
mov ret_lo, XL ; XXX use movw if available
mov ret_hi, XH
ret
.memccpy_notfound:
clr ret_lo
clr ret_hi
ret
.memccpy_end:
.size _U(memccpy), .memccpy_end - _U(memccpy)
#endif /* not DOXYGEN */
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