1/* Copyright (c) 2002, 2005, 2006, 2007 Marek Michalkiewicz 2 All rights reserved. 3 4 Redistribution and use in source and binary forms, with or without 5 modification, are permitted provided that the following conditions are met: 6 7 * Redistributions of source code must retain the above copyright 8 notice, this list of conditions and the following disclaimer. 9 * Redistributions in binary form must reproduce the above copyright 10 notice, this list of conditions and the following disclaimer in 11 the documentation and/or other materials provided with the 12 distribution. 13 * Neither the name of the copyright holders nor the names of 14 contributors may be used to endorse or promote products derived 15 from this software without specific prior written permission. 16 17 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 18 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 21 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 POSSIBILITY OF SUCH DAMAGE. */ 28 29/* $Id: strncpy_P.S 2503 2016-02-07 22:59:47Z joerg_wunsch $ */ 30 31 32#if !defined(__AVR_TINY__) 33 34#if !defined(__DOXYGEN__) 35 36#include "macros.inc" 37 38#define dest_hi r25 39#define dest_lo r24 40#define src_hi r23 41#define src_lo r22 42#define len_hi r21 43#define len_lo r20 44 45 ASSEMBLY_CLIB_SECTION 46 .global _U(strncpy_P) 47 .type _U(strncpy_P), @function 48_U(strncpy_P): 49 X_movw ZL, src_lo 50 X_movw XL, dest_lo 51.L_strncpy_P_loop: 52 subi len_lo, lo8(1) 53 sbci len_hi, hi8(1) 54 brcs .L_strncpy_P_done 55 X_lpm r0, Z+ 56 st X+, r0 57 tst r0 58 brne .L_strncpy_P_loop 59; store null characters up to the end of dest 60; as the glibc manual says: 61; This behavior is rarely useful, but it is specified by the ISO C standard. 62 rjmp .L_strncpy_P_clr_start 63.L_strncpy_P_clr_loop: 64 st X+, __zero_reg__ 65.L_strncpy_P_clr_start: 66 subi len_lo, lo8(1) 67 sbci len_hi, hi8(1) 68 brcc .L_strncpy_P_clr_loop 69.L_strncpy_P_done: 70; return dest (unchanged) 71 ret 72.L_strncpy_P_end: 73 .size _U(strncpy_P), .L_strncpy_P_end - _U(strncpy_P) 74 75#endif /* not __DOXYGEN__ */ 76 77#endif /* !defined(__AVR_TINY__) */ 78