Kari Argillander
f806c5829b
* pre-commit: Update and enable clang-format check There is newer version from clang-format so use that. We do not yet want 18 as that is little bit too new. * Format some thing by hand which clang-format "breaks" Clang-format will format some things little bit off in some cases. Format some things by hand so we get cleaner end result. * Run clang-format with ``` pre-commit run --all-files clang-format ``` We have already in previously checked places where clang-format does not make good format and ignored those (hopefully most of the things). --------- Co-authored-by: Kari Argillander <kari.argillander@fidelix.com>
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/**
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* @file
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* @brief API for memory copy function
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* @author Steve Karg <skarg@users.sourceforge.net>
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* @date 2008
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* @copyright SPDX-License-Identifier: GPL-2.0-or-later WITH GCC-exception-2.0
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* @section DESCRIPTION
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*
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* Memory copy functions for deeply embedded system. The functions
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* are used with a buffer, the buffer offset, the sizeof the buffer,
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* and the number of bytes to copy to the buffer.
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*/
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#include <stddef.h>
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#include <string.h>
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#include "bacnet/memcopy.h"
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/**
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* Tests to see if the number of bytes is available from an offset
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* given the maximum sizeof a buffer.
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*
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* @param offset - offset into a buffer
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* @param max - maximum sizeof a buffer
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* @param len - number of bytes to add to the buffer starting at offset.
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*
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* @return True if there is enough space to copy len bytes.
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*/
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bool memcopylen(size_t offset, size_t max, size_t len)
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{
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return ((offset + len) <= max);
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}
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#if defined(MEMCOPY_SIMPLE)
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/**
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* Copy len bytes from src to offset of dest if there is enough space
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* in a buffer of max bytes.
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*
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* @param dest - pointer to the destination buffer
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* @param src - pointer to the source buffer
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* @param offset - offset into the destination buffer
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* @param max - maximum sizeof the destination buffer
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* @param len - number of bytes to add to the destination buffer
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* starting at offset.
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*
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* @return returns zero if there is not enough space, or returns
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* the number of bytes copied.
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*/
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size_t memcopy(void *dest, void *src, size_t offset, size_t len, size_t max)
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{
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size_t i;
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size_t copy_len = 0;
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char *s1, *s2;
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s1 = dest;
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s2 = src;
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if (memcopylen(offset, max, len)) {
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for (i = 0; i < len; i++) {
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s1[offset + i] = s2[i];
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copy_len++;
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}
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}
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return copy_len;
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}
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#else
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/**
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* Copy len bytes from src to offset of dest if there is enough space
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* in a buffer of max bytes.
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*
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* @param dest - pointer to the destination buffer
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* @param src - pointer to the source buffer
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* @param offset - offset into the destination buffer
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* @param max - maximum sizeof the destination buffer
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* @param len - number of bytes to add to the destination buffer
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* starting at offset.
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*
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* @return returns zero if there is not enough space, or returns
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* the number of bytes copied.
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*/
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size_t memcopy(
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void *dest,
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const void *src,
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size_t offset, /* where in dest to put the data */
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size_t len, /* amount of data to copy */
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size_t max)
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{ /* total size of destination */
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if (memcopylen(offset, max, len)) {
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memcpy(&((char *)dest)[offset], src, len);
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return (len);
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}
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return 0;
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}
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#endif
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