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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. */
/*
strcasecmp_P.S
Case insensitive compare
Contributors:
Created by Reiner Patommel
*/
#include "macros.inc"
#define s1_hi r25
#define s1_lo r24
#define s2_hi r23
#define s2_lo r22
#define ret_hi r25
#define ret_lo r24
#define tmp r22
#define cht r21
/** \ingroup avr_pgmspace
\fn int strcasecmp_P(const char *s1, PGM_P s2)
\brief Compare two strings ignoring case.
The strcasecmp_P() function compares the two strings s1 and s2, ignoring
the case of the characters.
\param s1 A pointer to a string in the devices SRAM.
\param s2 A pointer to a string in the devices Flash.
\returns The strcasecmp_P() function returns an integer less than, equal
to, or greater than zero if s1 is found, respectively, to be less than, to
match, or be greater than s2. */
#if !defined(DOXYGEN)
.text
.global _U(strcasecmp_P)
.type _U(strcasecmp_P), @function
_U(strcasecmp_P):
LOAD_Z(s2_lo, s2_hi)
LOAD_X(s1_lo, s1_hi)
.strcasecmp_P_loop:
LD ret_lo, X+ ; load *s1
LPM_R0_ZP ; load *s2
MOV tmp,r0 ; copy of *s2 to tmp
MOV cht, r0 ; copy of *s2 to cht
ORI cht, 0x20 ; make tmp lower case
CPI cht, 'a' ; test on [a .. z]
BRLT .strcasecmp_P_tst
CPI cht, 'z'+1
BRGE .strcasecmp_P_tst
ORI tmp, 0x20 ; we got an aplpha in s2
ORI ret_lo, 0x20
.strcasecmp_P_tst: ; compare
SUB ret_lo, tmp
BRNE .strcasecmp_P_done
TST r0 ; end of s2?
BRNE .strcasecmp_P_loop
.strcasecmp_P_done:
; ret_hi = SREG.C ? 0xFF : 0
SBC ret_hi, ret_hi
RET
.strcasecmp_P_end:
.size _U(strcasecmp_P), .strcasecmp_P_end - _U(strcasecmp_P)
#endif /* not DOXYGEN */
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