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/*
strcasecmp_P.S
Case insensitive compare
Contributors:
Created by Reiner Patommel
THIS SOFTWARE IS NOT COPYRIGHTED
This source code is offered for use in the public domain. You may
use, modify or distribute it freely.
This code is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
DISCLAIMED. This includes but is not limited to warranties of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
#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
; int strcasecmp_P(const char *s1, const char *s2)
.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)
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