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/* Copyright (c) 2002, Reiner Patommel
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: strlwr.S,v 1.6 2005/11/05 16:49:46 aesok Exp $ */
/*
strlwr.S
convert a string to lower case
Contributors:
Created by Reiner Patommel
*/
#include "macros.inc"
#define str_hi r25
#define str_lo r24
#define temp r21
/** \ingroup avr_string
\fn char *strlwr(char *string)
\brief Convert a string to lower case.
The strlwr() function will convert a string to lower case. Only the upper
case alphabetic characters [A .. Z] are converted. Non-alphabetic
characters will not be changed.
\returns The strlwr() function returns a pointer to the converted
string. */
#if !defined(__DOXYGEN__)
.text
.global _U(strlwr)
.type _U(strlwr), @function
_U(strlwr):
X_movw XL, str_lo
.L_strlwr_loop:
LD temp, X ; get 1st character
TST temp ; is it end of string
BREQ .L_strlwr_done
ORI temp, 0x20 ; make lower case
CPI temp, 'a' ; test on [a .. z]
BRLT .L_strlwr_next
CPI temp, 'z'+1
BRGE .L_strlwr_next
ST X, temp ; ok, it is a char --> store it
.L_strlwr_next:
ADIW XL, 1 ; point to next character
RJMP .L_strlwr_loop
.L_strlwr_done:
RET
.L_strlwr_end:
.size _U(strlwr), .L_strlwr_end - _U(strlwr)
#endif /* not __DOXYGEN__ */
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