/* Copyright (c) 2002, 2007 Marek Michalkiewicz 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. */ /* $Id$ */ #if !defined(__DOXYGEN__) #include "macros.inc" #define src_hi r25 #define src_lo r24 #define len_hi r23 #define len_lo r22 ASSEMBLY_CLIB_SECTION .global _U(strnlen) .type _U(strnlen), @function _U(strnlen): X_movw ZL, src_lo .L_strnlen_loop: subi len_lo, lo8(1) sbci len_hi, hi8(1) ld __tmp_reg__, Z+ cpse __tmp_reg__, __zero_reg__ brcc .L_strnlen_loop ; Z points one character past the terminating NUL ; return Z - 1 - src = (-1 - src) + Z = ~src + Z com src_lo com src_hi add src_lo, ZL adc src_hi, ZH ret .L_strnlen_end: .size _U(strnlen), .L_strnlen_end - _U(strnlen) #endif /* not __DOXYGEN__ */