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mbed client lightswitch demo
Dependencies: mbed Socket lwip-eth lwip-sys lwip
Fork of mbed-client-classic-example-lwip by
nanostack-libservice/source/libBits/common_functions.c
- Committer:
- mbedAustin
- Date:
- 2016-06-09
- Revision:
- 11:cada08fc8a70
File content as of revision 11:cada08fc8a70:
/* * Copyright (c) 2014-2015 ARM Limited. All rights reserved. * SPDX-License-Identifier: Apache-2.0 * Licensed under the Apache License, Version 2.0 (the License); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an AS IS BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * Most functions can be inlined, and definitions are in common_functions.h. * Define COMMON_FUNCTIONS_FN before including it to generate external definitions. */ #define COMMON_FUNCTIONS_FN extern #include "common_functions.h" #include <string.h> /* Returns mask for <split_value> (0-8) most-significant bits of a byte */ static inline uint8_t context_split_mask(uint_fast8_t split_value) { return (uint8_t) - (0x100u >> split_value); } bool bitsequal(const uint8_t *a, const uint8_t *b, uint_fast8_t bits) { uint_fast8_t bytes = bits / 8; bits %= 8; if (memcmp(a, b, bytes)) { return false; } if (bits) { uint_fast8_t split_bit = context_split_mask(bits); if ((a[bytes] & split_bit) != (b[bytes] & split_bit)) { return false; } } return true; } uint8_t *bitcopy(uint8_t *restrict dst, const uint8_t *restrict src, uint_fast8_t bits) { uint_fast8_t bytes = bits / 8; bits %= 8; if (bytes) { dst = (uint8_t *) memcpy(dst, src, bytes) + bytes; src += bytes; } if (bits) { uint_fast8_t split_bit = context_split_mask(bits); *dst = (*src & split_bit) | (*dst & ~ split_bit); } return dst; } uint8_t *bitcopy0(uint8_t *restrict dst, const uint8_t *restrict src, uint_fast8_t bits) { uint_fast8_t bytes = bits / 8; bits %= 8; if (bytes) { dst = (uint8_t *) memcpy(dst, src, bytes) + bytes; src += bytes; } if (bits) { uint_fast8_t split_bit = context_split_mask(bits); *dst = (*src & split_bit); } return dst; }