mirror of
https://github.com/obgm/libcoap.git
synced 2026-10-31 23:15:48 +03:00
Carsten Schoenert
0e59edc231
Resume the cleaning of the public header files, no functional changes. Reformatting the infos in the head of the header files, restructure header inclusion check to be more generic. Reorder some include directives in a alphabetical order. Remove including instructions for C++ stuff, it's already done in the coap.h header, and the user only has to include this header file. Dropping the prefixing of the include guarding of uthash.h because it would cause trouble with the macro handling in TinyDLS. Thanks Olaf for reminding this!
80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/*
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* bits.h -- bit vector manipulation
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*
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* Copyright (C) 2010-2011 Olaf Bergmann <bergmann@tzi.org>
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*
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* This file is part of the CoAP library libcoap. Please see README for terms
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* of use.
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*/
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/**
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* @file bits.h
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* @brief Bit vector manipulation
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*/
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#ifndef _COAP_BITS_H_
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#define _COAP_BITS_H_
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#include <stdint.h>
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#include <sys/types.h>
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/**
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* Sets the bit @p bit in bit-vector @p vec. This function returns @c 1 if bit
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* was set or @c -1 on error (i.e. when the given bit does not fit in the
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* vector).
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*
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* @param vec The bit-vector to change.
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* @param size The size of @p vec in bytes.
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* @param bit The bit to set in @p vec.
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*
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* @return @c -1 if @p bit does not fit into @p vec, @c 1 otherwise.
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*/
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inline static int
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bits_setb(uint8_t *vec, size_t size, uint8_t bit) {
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if (size <= (bit >> 3))
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return -1;
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*(vec + (bit >> 3)) |= (uint8_t)(1 << (bit & 0x07));
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return 1;
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}
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/**
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* Clears the bit @p bit from bit-vector @p vec. This function returns @c 1 if
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* bit was cleared or @c -1 on error (i.e. when the given bit does not fit in
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* the vector).
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*
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* @param vec The bit-vector to change.
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* @param size The size of @p vec in bytes.
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* @param bit The bit to clear from @p vec.
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*
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* @return @c -1 if @p bit does not fit into @p vec, @c 1 otherwise.
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*/
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inline static int
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bits_clrb(uint8_t *vec, size_t size, uint8_t bit) {
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if (size <= (bit >> 3))
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return -1;
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*(vec + (bit >> 3)) &= (uint8_t)(~(1 << (bit & 0x07)));
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return 1;
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}
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/**
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* Gets the status of bit @p bit from bit-vector @p vec. This function returns
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* @c 1 if the bit is set, @c 0 otherwise (even in case of an error).
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*
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* @param vec The bit-vector to read from.
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* @param size The size of @p vec in bytes.
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* @param bit The bit to get from @p vec.
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*
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* @return @c 1 if the bit is set, @c 0 otherwise.
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*/
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inline static int
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bits_getb(const uint8_t *vec, size_t size, uint8_t bit) {
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if (size <= (bit >> 3))
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return -1;
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return (*(vec + (bit >> 3)) & (1 << (bit & 0x07))) != 0;
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}
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#endif /* _COAP_BITS_H_ */
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