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/*
strncasecmp_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 len_hi r21
#define len_lo r20
#define cht r19
#define tmp r18
#define ret_hi r25
#define ret_lo r24
; int strncasecmp_P(const char *s1, const char flash *s2, size_t len)
.text
.global _U(strncasecmp_P)
.type _U(strncasecmp_P), @function
_U(strncasecmp_P):
LOAD_Z(s2_lo, s2_hi)
LOAD_X(s1_lo, s1_hi)
.strncasecmp_P_loop:
SUBI len_lo, lo8(1)
SBCI len_hi, hi8(1)
BRCS .strncasecmp_P_equal
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 it lower case
CPI cht, 'a' ; test on [a .. z]
BRLT .strncasecmp_P_tst
CPI cht, 'z'+1
BRGE .strncasecmp_P_tst
ORI tmp, 0x20 ; we got an alpha in s2
ORI ret_lo, 0x20 ; make *s1, *s2 lower case
.strncasecmp_P_tst:
SUB ret_lo, tmp
BRNE .strncasecmp_P_done
TST r0
BRNE .strncasecmp_P_loop
.strncasecmp_P_equal:
SUB ret_lo, ret_lo
.strncasecmp_P_done:
; ret_hi = SREG.C ? 0xFF : 0
SBC ret_hi, ret_hi
RET
.strncasecmp_P_end:
.size _U(strncasecmp_P), .strncasecmp_P_end - _U(strncasecmp_P)
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