1/* Copyright (c) 2006, Carlos Lamas 2 3 based on libc/pmstring/strlcpy_P.S which is 4 Copyright (c) 2003, Eric B. Weddington 5 6 All rights reserved. 7 8 Redistribution and use in source and binary forms, with or without 9 modification, are permitted provided that the following conditions are met: 10 11 * Redistributions of source code must retain the above copyright 12 notice, this list of conditions and the following disclaimer. 13 * Redistributions in binary form must reproduce the above copyright 14 notice, this list of conditions and the following disclaimer in 15 the documentation and/or other materials provided with the 16 distribution. 17 * Neither the name of the copyright holders nor the names of 18 contributors may be used to endorse or promote products derived 19 from this software without specific prior written permission. 20 21 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 22 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 25 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 POSSIBILITY OF SUCH DAMAGE. 32 33*/ 34 35/* $Id: strlcpy_PF.S 2503 2016-02-07 22:59:47Z joerg_wunsch $ */ 36 37#if !defined(__AVR_TINY__) 38 39#if !defined(__DOXYGEN__) 40 41#include "macros.inc" 42 43#define dst_b1 r25 44#define dst_b0 r24 45#define src_b3 r23 46#define src_b2 r22 47#define src_b1 r21 48#define src_b0 r20 49#define siz_b1 r19 50#define siz_b0 r18 51 52#define rWord_b1 r25 53#define rWord_b0 r24 54 55 .text 56 .global _U(strlcpy_PF) 57 .type _U(strlcpy_PF), @function 58 59_U(strlcpy_PF): 60 61 X_movw ZL, src_b0 ; Z = src 62 LPM_R0_ZPLUS_INIT src_b2 63 X_movw XL, dst_b0 ; X = dst 64 cp siz_b0, __zero_reg__ 65 cpc siz_b0, __zero_reg__ ; size == 0 ? 66 breq .L_strlcpy_PF_truncated 67 68.L_strlcpy_PF_copy_loop: ; copy src to dst 69 70 subi siz_b0, lo8(1) 71 sbci siz_b1, hi8(1) ; decrement siz 72 breq 1f ; --> siz chars copied 73 LPM_R0_ZPLUS_NEXT src_b2 ; get next src char 74 st X+, r0 ; copy char 75 tst r0 ; end of src string ? 76 breq .L_strlcpy_PF_len ; --> all src chars copied 77 rjmp .L_strlcpy_PF_copy_loop ; next char 781: st X, __zero_reg__ ; truncate dst string 79 80.L_strlcpy_PF_truncated: ; find Z = end of src string 81 82 LPM_R0_ZPLUS_NEXT src_b2 ; get next char from src 83 tst r0 ; end of src string ? 84 brne .L_strlcpy_PF_truncated ; next char 85 86.L_strlcpy_PF_len: ; calculate strlen(src) 87 88 sub ZL, src_b0 89 sbc ZH, src_b1 ; Z points past \0 90 sbiw ZL, 1 91 X_movw rWord_b0, ZL 92 ret 93 94.L_strlcpy_PF_end: 95 96 .size _U(strlcpy_PF), .L_strlcpy_PF_end - _U(strlcpy_PF) 97 98#endif /* not __DOXYGEN__ */ 99 100#endif /* !defined(__AVR_TINY__) */ 101