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/* Copyright (C) 2023 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/*!
* \brief String manipulations.
*/
#pragma once
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
extern const char *configure_summary;
/*!
* \brief Create a copy of a binary buffer.
*
* Like \c strdup, but for binary data.
*/
uint8_t *memdup(const uint8_t *data, size_t data_size);
/*!
* \brief Compare a zero-terminated string with fixed-size memory.
*/
int strmemcmp(const char *str, const uint8_t *mem, size_t mem_size);
/*!
* \brief Format string and take care of allocating memory.
*
* \note sprintf(3) manual page reference implementation.
*
* \param fmt Message format.
* \return formatted message or NULL.
*/
char *sprintf_alloc(const char *fmt, ...);
/*!
* \brief Create new string from a concatenation of s1 and s2.
*
* \param s1 First string.
* \param s2 Second string.
*
* \retval Newly allocated string on success.
* \retval NULL on error.
*/
char *strcdup(const char *s1, const char *s2);
/*!
* \brief Create a copy of a string skipping leading and trailing white spaces.
*
* \return Newly allocated string, NULL in case of error.
*/
char *strstrip(const char *str);
/*!
* \brief Convert upper-case letters to lower-case in a string.
*/
void strtolower(char *str);
/*!
* \brief Compare data in time based on string length.
* This function just checks for (in)equality not for relation
*
* \param s1 The first address to compare.
* \param s2 The second address to compare.
* \param n The size of memory to compare.
*
* \return Non zero on difference and zero if the buffers are identical.
*/
int const_time_memcmp(const void *s1, const void *s2, size_t n);
/*!
* \brief Fill memory with zeroes.
*
* Inspired by OPENSSL_cleanse. Such a memset shouldn't be optimized out.
*
* \param s The address to fill.
* \param n The size of memory to fill.
*
* \return Pointer to the memory.
*/
void *memzero(void *s, size_t n);
/*!
* \brief Convert binary data to hexadecimal string.
*/
char *bin_to_hex(const uint8_t *bin, size_t bin_len, bool upper_case);
/*!
* \brief Convert hex encoded string to binary data.
*/
uint8_t *hex_to_bin(const char *hex, size_t *out_len);
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