125 lines
4.4 KiB
C
125 lines
4.4 KiB
C
/****************************************************************************
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* include/nuttx/b2c.h
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*
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* Copyright (C) 2019 Pinecone Inc. All rights reserved.
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* Author: Xiang Xiao <xiaoxiang@xiaomi.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_B2C_H
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#define __INCLUDE_NUTTX_B2C_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <string.h>
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#include <limits.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#if CHAR_BIT == 8
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# define CHAR_BYTE 1
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# define CHAR_SHIFT 0
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#elif CHAR_BIT == 16
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# define CHAR_BYTE 2
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# define CHAR_SHIFT 1
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#elif CHAR_BIT == 32
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# define CHAR_BYTE 4
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# define CHAR_SHIFT 2
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#else
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# error unsupported CHAR_BIT value
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#endif
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/* Macros convert between chars and bytes */
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#define B2C(x) (((x) + CHAR_BYTE - 1) >> CHAR_SHIFT)
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#define C2B(x) ((x) << CHAR_SHIFT)
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#define B2C_OFF(x) ((x) >> CHAR_SHIFT)
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#define C2B_OFF(x) ((x) << CHAR_SHIFT)
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#define B2C_REM(x) ((x) - C2B_OFF(B2C_OFF(x)))
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#define B2C_SHIFT(x) ((x) - CHAR_SHIFT)
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#define C2B_SHIFT(x) ((x) + CHAR_SHIFT)
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/* Functions convert between chars and bytes */
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#if CHAR_BIT != 8
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size_t bstrnlen(FAR const char *src, size_t maxlen);
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FAR char *ancstr2bstr(FAR const char *src, size_t maxlen);
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FAR char *anbstr2cstr(FAR const char *src, size_t maxlen);
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void ncstr2bstr(FAR char *dst, FAR const char *src, size_t maxlen);
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void nbstr2cstr(FAR char *dst, FAR const char *src, size_t maxlen);
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void cmem2bmem(FAR void *dst, size_t rem, FAR const void *src, size_t len);
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void bmem2cmem(FAR void *dst, FAR const void *src, size_t rem, size_t len);
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# define cstr2bstr(dst, src) ncstr2bstr(dst, src, SIZE_MAX)
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# define bstr2cstr(dst, src) nbstr2cstr(dst, src, SIZE_MAX)
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#else
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# define bstrnlen(src, maxlen) strnlen(src, maxlen)
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# define ancstr2bstr(src, maxlen) strndup(src, maxlen)
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# define anbstr2cstr(src, maxlen) strndup(src, maxlen)
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# define ncstr2bstr(dst, src, maxlen) strncpy(dst, src, maxlen)
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# define nbstr2cstr(dst, src, maxlen) strncpy(dst, src, maxlen)
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# define cmem2bmem(dst, rem, src, len) memcpy((FAR char *)(dst) + rem, src, len)
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# define bmem2cmem(dst, src, rem, len) memcpy(dst, (FAR char *)(src) + rem, len)
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# define cstr2bstr(dst, src) strcpy(dst, src)
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# define bstr2cstr(dst, src) strcpy(dst, src)
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#endif
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#define bstrlen(src) bstrnlen(src, SIZE_MAX)
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#define acstr2bstr(src) ancstr2bstr(src, SIZE_MAX)
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#define abstr2cstr(src) anbstr2cstr(src, SIZE_MAX)
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#endif /* __INCLUDE_NUTTX_B2C_H */
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