1/* Copyright (c) 2002, 2007 Reiner Patommel 2 Copyright (c) 2007 Dmitry Xmelkov 3 All rights reserved. 4 5 Redistribution and use in source and binary forms, with or without 6 modification, are permitted provided that the following conditions are met: 7 8 * Redistributions of source code must retain the above copyright 9 notice, this list of conditions and the following disclaimer. 10 * Redistributions in binary form must reproduce the above copyright 11 notice, this list of conditions and the following disclaimer in 12 the documentation and/or other materials provided with the 13 distribution. 14 * Neither the name of the copyright holders nor the names of 15 contributors may be used to endorse or promote products derived 16 from this software without specific prior written permission. 17 18 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 POSSIBILITY OF SUCH DAMAGE. */ 29 30/* $Id: strlwr.S 1944 2009-04-01 23:12:20Z arcanum $ */ 31 32/* 33 strlwr.S 34 convert a string to lower case 35 36 Contributors: 37 Created by Reiner Patommel 38*/ 39 40/** \file */ 41 42/** \ingroup avr_string 43 \fn char *strlwr(char *s) 44 \brief Convert a string to lower case. 45 46 The strlwr() function will convert a string to lower case. Only the upper 47 case alphabetic characters [A .. Z] are converted. Non-alphabetic 48 characters will not be changed. 49 50 \returns The strlwr() function returns a pointer to the converted 51 string. */ 52 53#if !defined(__DOXYGEN__) 54 55#include "macros.inc" 56 57#define str_hi r25 58#define str_lo r24 59#define temp r22 60 61 ASSEMBLY_CLIB_SECTION 62 .global _U(strlwr) 63 .type _U(strlwr), @function 64 65_U(strlwr): 66 X_movw XL, str_lo 67 681: ld temp, X 69 subi temp, 'A' 70 cpi temp, 'Z'-'A'+1 71 brlo 2f ; if tepm is A..Z, then temp += 'a'-'A' 72 subi temp, 'a'-'A' ; else restore temp 732: subi temp, -'a' 74 st X+, temp 75 brne 1b ; Z for temp 76 ret 77 78 .size _U(strlwr), . - _U(strlwr) 79 80#endif /* not __DOXYGEN__ */ 81