88071abb43
Our coding style recommends C style comments (/* */) instead of C++ (//). Also, systemd (which we partly fork) uses C style comments for the SPDX-License-Identifier. Unify the style. $ sed -i '1 s#// SPDX-License-Identifier: \([^ ]\+\)$#/* SPDX-License-Identifier: \1 */#' -- $(git ls-files -- '*.[hc]' '*.[hc]pp')
37 lines
1.6 KiB
C
37 lines
1.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
|
|
|
|
#ifndef __NM_STD_UTILS_H__
|
|
#define __NM_STD_UTILS_H__
|
|
|
|
#include <stdbool.h>
|
|
|
|
#include "nm-std-aux.h"
|
|
|
|
/*****************************************************************************/
|
|
|
|
/* nm_utils_get_next_realloc_size() is used to grow buffers exponentially, when
|
|
* the final size is unknown. As such, it has borders for which it allocates
|
|
* certain buffer sizes.
|
|
*
|
|
* The use of these defines is to get favorable allocation sequences.
|
|
* For example, nm_str_buf_init() asks for an initial allocation size. Note that
|
|
* it reserves the exactly requested amount, under the assumption that the
|
|
* user may know how many bytes will be required. However, often the caller
|
|
* doesn't know in advance, and NMStrBuf grows exponentially by calling
|
|
* nm_utils_get_next_realloc_size().
|
|
* Imagine you call nm_str_buf_init() with an initial buffer size 100, and you
|
|
* add one character at a time. Then the first reallocation will increase the
|
|
* buffer size only from 100 to 104.
|
|
* If you however start with an initial buffer size of 104, then the next reallocation
|
|
* via nm_utils_get_next_realloc_size() gives you 232, and so on. By using
|
|
* these sizes, it results in one less allocation, if you anyway don't know the
|
|
* exact size in advance. */
|
|
#define NM_UTILS_GET_NEXT_REALLOC_SIZE_32 ((size_t) 32)
|
|
#define NM_UTILS_GET_NEXT_REALLOC_SIZE_40 ((size_t) 40)
|
|
#define NM_UTILS_GET_NEXT_REALLOC_SIZE_104 ((size_t) 104)
|
|
#define NM_UTILS_GET_NEXT_REALLOC_SIZE_1000 ((size_t) 1000)
|
|
|
|
size_t nm_utils_get_next_realloc_size(bool true_realloc, size_t requested);
|
|
|
|
#endif /* __NM_STD_UTILS_H__ */
|