/* AVR LIBC strlcpy() Copyright (c) 2003, 2007 Eric B. Weddington, R. Patommel Copyright (c) 2009 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. */ /* $Id$ */ #if !defined(__AVR_TINY__) #if !defined(__DOXYGEN__) #include "asmdef.h" #define dst_lo r24 #define src_hi r23 #define src_lo r22 #define siz_hi r21 #define siz_lo r20 #define rslt_lo r24 ENTRY strlcpy X_movw XL, dst_lo ; X = dst X_movw ZL, src_lo ; Z = src ; copy loop 1: subi siz_lo, lo8(1) sbci siz_hi, hi8(1) brcs 4f ; is possible with siz == 0 breq 3f ; --> siz chars copied ld __tmp_reg__, Z+ st X+, __tmp_reg__ tst __tmp_reg__ brne 1b ; calculate result (Z - 1 - src) and return 2: sub ZL, src_lo sbc ZH, src_hi sbiw ZL, 1 X_movw rslt_lo, ZL ret ; terminate dst 3: st X, __zero_reg__ ; find src end 4: ld __tmp_reg__, Z+ tst __tmp_reg__ brne 4b rjmp 2b ENDFUNC #endif /* not __DOXYGEN__ */ #endif /* !defined(__AVR_TINY__) */