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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 src_hi r25
#define src_lo r24
; #define val_hi r23
#define val_lo r22
#define ret_hi r25
#define ret_lo r24
/** \ingroup avr_string
\fn char *strchr(const char *src, int val)
\brief Locate character in string.
The strchr() function returns a pointer to the first occurrence of the
character val in the string src.
Here "character" means "byte" - these functions do not work with wide or
multi-byte characters.
\returns The strchr() function returns a pointer to the matched character
or NULL if the character is not found. */
#if !defined(DOXYGEN)
.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)
#endif /* not DOXYGEN */
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