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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#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_232 ((size_t) 232)
#define NM_UTILS_GET_NEXT_REALLOC_SIZE_488 ((size_t) 488)
#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);
const char *_nm_strerror_r(int errsv, char *buf, size_t buf_size);
bool nm_utils_set_effective_user(const char *user, char *errbuf, size_t errbuf_size);
bool nm_utils_read_file_to_stdout(const char *filename, char *errbuf, size_t errbuf_len);
#endif /* __NM_STD_UTILS_H__ */
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