/* Copyright (c) 2002, 2007 Reiner Patommel Copyright (c) 2007 Dmitry Xmelkov 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. */ /* $Id$ */ /* strncasecmp.S Case insensitive compare Contributors: Created by Reiner Patommel */ /** \file */ /** \ingroup avr_string \fn int strncasecmp(const char *s1, const char *s2, size_t len) \brief Compare two strings ignoring case. The strncasecmp() function is similar to strcasecmp(), except it only compares the first \p len characters of \p s1. \returns The strncasecmp() function returns an integer less than, equal to, or greater than zero if \p s1 (or the first \p len bytes thereof) is found, respectively, to be less than, to match, or be greater than \p s2. A consequence of the ordering used by strncasecmp() is that if \p s1 is an initial substring of \p s2, then \p s1 is considered to be "less than" \p s2. */ #if !defined(__DOXYGEN__) #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 tmp r22 #define ret_hi r25 #define ret_lo r24 ASSEMBLY_CLIB_SECTION .global _U(strncasecmp) .type _U(strncasecmp), @function _U(strncasecmp): X_movw ZL, s2_lo X_movw XL, s1_lo 1: subi len_lo, lo8(1) ; if (--len == -1) return 0 sbci len_hi, hi8(1) brlo 5f ld ret_lo, X+ ; *s1++ cpi ret_lo, 'A' ; if in [A-Z] then tolower() brlt 2f cpi ret_lo, 'Z'+1 brge 2f subi ret_lo, 'A'-'a' 2: ld tmp, Z+ ; *s2++ cpi tmp, 'A' ; if in [A-Z] then tolower() brlt 3f cpi tmp, 'Z'+1 brge 3f subi tmp, 'A'-'a' 3: sub ret_lo, tmp ; compare cpse tmp, __zero_reg__ ; break, if end of string breq 1b 4: sbc ret_hi, ret_hi ; sign extension ret 5: sub ret_lo, ret_lo ; length limit, return 0 rjmp 4b .size _U(strncasecmp), . - _U(strncasecmp) #endif /* not __DOXYGEN__ */