| /* 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: strcspn.S 2191 2010-11-05 13:45:57Z arcanum $ */ |
| |
| /** \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__) */ |