1/* Copyright (c) 2006, Carlos Lamas 2 3 based on libc/pmstring/strncat_P.S which is 4 Copyright (c) 2003, Reiner Patommel 5 6 based on strncat by Marek Michalkiewicz 7 8 All rights reserved. 9 10 Redistribution and use in source and binary forms, with or without 11 modification, are permitted provided that the following conditions are met: 12 13 * Redistributions of source code must retain the above copyright 14 notice, this list of conditions and the following disclaimer. 15 * Redistributions in binary form must reproduce the above copyright 16 notice, this list of conditions and the following disclaimer in 17 the documentation and/or other materials provided with the 18 distribution. 19 * Neither the name of the copyright holders nor the names of 20 contributors may be used to endorse or promote products derived 21 from this software without specific prior written permission. 22 23 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 24 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 27 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 POSSIBILITY OF SUCH DAMAGE. */ 34 35/* $Id: strncat_PF.S 2503 2016-02-07 22:59:47Z joerg_wunsch $ */ 36 37#if !defined(__AVR_TINY__) 38 39#include "macros.inc" 40 41#define dest_b1 r25 42#define dest_b0 r24 43#define src_b3 r23 44#define src_b2 r22 45#define src_b1 r21 46#define src_b0 r20 47#define len_b1 r19 48#define len_b0 r18 49 50#if !defined(__DOXYGEN__) 51 52 .text 53 .global _U(strncat_PF) 54 .type _U(strncat_PF), @function 55 56_U(strncat_PF): 57 58 X_movw ZL, src_b0 59 LPM_R0_ZPLUS_INIT src_b2 60 X_movw XL, dest_b0 61 62.L_strncat_PF_skip: 63 64 ld r0, X+ 65 tst r0 66 brne .L_strncat_PF_skip 67 sbiw XL, 1 ; undo post-increment (point the the NUL) 68 69.L_strncat_PF_loop: 70 71 subi len_b0, lo8(1) 72 sbci len_b1, hi8(1) 73 brcs .L_strncat_PF_done 74 LPM_R0_ZPLUS_NEXT src_b2 75 tst r0 76 st X+, r0 77 brne .L_strncat_PF_loop 78 79; return dest (unchanged) 80 81 ret 82 83.L_strncat_PF_done: 84 85 st X, __zero_reg__ 86 87; return dest (unchanged) 88 89 ret 90 91.L_strncat_PF_end: 92 93 .size _U(strncat_PF), .L_strncat_PF_end - _U(strncat_PF) 94 95#endif /* not __DOXYGEN__ */ 96 97#endif /* !defined(__AVR_TINY__) */ 98