/* Copyright (c) 2007 Dmitry Xmelkov 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. */ /* $Id$ */ /** \file */ /** \ingroup avr_string \fn size_t strcspn(const char *s, const char *reject) The strcspn() function calculates the length of the initial segment of \p s which consists entirely of characters not in \p reject. \return The strcspn() function returns the number of characters in the initial segment of \p s which are not in the string \p reject. The terminating zero is not considered as a part of string. */ #if !defined(__AVR_TINY__) #ifndef __DOXYGEN__ #include "macros.inc" #define str_lo r24 #define str_hi r25 #define acc_lo r22 #define acc_hi r23 #define chs r21 /* char from s[] */ ASSEMBLY_CLIB_SECTION .global _U(strcspn) .type _U(strcspn), @function _U(strcspn): X_movw XL, str_lo ; get next symbol from s[] 1: ld chs, X+ ; *s++ tst chs breq 3f ; check an occurance X_movw ZL, acc_lo 2: ld r0, Z+ cp r0, chs cpse r0, __zero_reg__ brne 2b brne 1b ; branch if chs is't present in reject[] ; end of scanning: chs is found or end of s[] is reached ; Return: X - 1 - str == X + ~str 3: com str_lo com str_hi add str_lo, XL adc str_hi, XH ret .size _U(strcspn), . - _U(strcspn) #endif /* !__DOXYGEN__ */ #endif /* !defined(__AVR_TINY__) */