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// VariantKey
//
// hex.h
//
// @category Libraries
// @author Nicola Asuni <info@tecnick.com>
// @link https://github.com/tecnickcom/variantkey
// @license MIT [LICENSE](https://raw.githubusercontent.com/tecnickcom/variantkey/main/LICENSE)
// @copyright 2017-2018 GENOMICS plc
//
// LICENSE
//
// Copyright (c) 2017-2018 GENOMICS plc
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
/**
* @file hex.h
* @brief Utility functions to manipulate strings.
*
* Collection of utility functions to manipulate strings.
*/
#ifndef ASTRING_H
#define ASTRING_H
#include <inttypes.h>
#include <stdio.h>
/** @brief Returns uint64_t hexadecimal string (16 characters).
*
* @param n Number to parse
* @param str String buffer to be returned (it must be sized 17 bytes at least).
*
* @return Upon successful return, these function returns the number of characters processed
* (excluding the null byte used to end output to strings).
* If the buffer size is not sufficient, then the return value is the number of characters required for
* buffer string, including the terminating null byte.
*/
static inline size_t hex_uint64_t(uint64_t n, char *str)
{
return sprintf(str, "%016" PRIx64, n);
}
/** @brief Parses a 16 chars hexadecimal string and returns the code.
*
* @param s Hexadecimal string to parse (it must contain 16 hexadecimal characters).
*
* @return uint64_t unsigned integer number.
*/
static inline uint64_t parse_hex_uint64_t(const char *s)
{
uint64_t v = 0;
uint8_t b;
size_t i;
for (i = 0; i < 16; i++)
{
b = s[i];
if (b >= 'a')
{
b -= ('a' - 10); // a-f
}
else
{
if (b >= 'A')
{
b -= ('A' - 10); // A-F
}
else
{
b -= '0'; // 0-9
}
}
v = ((v << 4) | b);
}
return v;
}
#endif // ASTRING_H
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