/* Copyright (c) 2006, Carlos Lamas based on libc/pmstring/strlcpy_P.S which is Copyright (c) 2003, Eric B. Weddington 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 "macros.inc" #define dst_b1 r25 #define dst_b0 r24 #define src_b3 r23 #define src_b2 r22 #define src_b1 r21 #define src_b0 r20 #define siz_b1 r19 #define siz_b0 r18 #define rWord_b1 r25 #define rWord_b0 r24 .text .global _U(strlcpy_PF) .type _U(strlcpy_PF), @function _U(strlcpy_PF): X_movw ZL, src_b0 ; Z = src LPM_R0_ZPLUS_INIT src_b2 X_movw XL, dst_b0 ; X = dst cp siz_b0, __zero_reg__ cpc siz_b0, __zero_reg__ ; size == 0 ? breq .L_strlcpy_PF_truncated .L_strlcpy_PF_copy_loop: ; copy src to dst subi siz_b0, lo8(1) sbci siz_b1, hi8(1) ; decrement siz breq 1f ; --> siz chars copied LPM_R0_ZPLUS_NEXT src_b2 ; get next src char st X+, r0 ; copy char tst r0 ; end of src string ? breq .L_strlcpy_PF_len ; --> all src chars copied rjmp .L_strlcpy_PF_copy_loop ; next char 1: st X, __zero_reg__ ; truncate dst string .L_strlcpy_PF_truncated: ; find Z = end of src string LPM_R0_ZPLUS_NEXT src_b2 ; get next char from src tst r0 ; end of src string ? brne .L_strlcpy_PF_truncated ; next char .L_strlcpy_PF_len: ; calculate strlen(src) sub ZL, src_b0 sbc ZH, src_b1 ; Z points past \0 sbiw ZL, 1 X_movw rWord_b0, ZL LPM_R0_ZPLUS_FINI src_b2 ret .L_strlcpy_PF_end: .size _U(strlcpy_PF), .L_strlcpy_PF_end - _U(strlcpy_PF) #endif /* not __DOXYGEN__ */ #endif /* !defined(__AVR_TINY__) */