mirror of
https://github.com/clearlinux/graphene.git
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Michał Kowalczyk
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/* SPDX-License-Identifier: LGPL-3.0-or-later */
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/* Copyright (C) 2014 OSCAR lab, Stony Brook University
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* 2017 University of North Carolina at Chapel Hill
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*/
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#ifndef HEX_H
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#define HEX_H
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#include <stddef.h>
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#include <stdint.h>
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#include "api.h"
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#include "assert.h"
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/* This function is a helper for debug printing.
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* It accepts a pointer to a numerical value, and
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* formats it as a hex string, for printing.
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* size is the number of bytes pointed to by hex.
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* str is the caller-provided buffer, len is the length of the buffer.
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* The len must be at least (size * 2)+1.
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*/
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static inline char* __bytes2hexstr(void* hex, size_t size, char* str, size_t len) {
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static const char* ch = "0123456789abcdef";
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__UNUSED(len);
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assert(len >= size * 2 + 1);
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for (size_t i = 0; i < size; i++) {
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unsigned char h = ((unsigned char*)hex)[i];
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str[i * 2] = ch[h / 16];
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str[i * 2 + 1] = ch[h % 16];
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}
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str[size * 2] = 0;
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return str;
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}
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#define IS_CHAR_ARRAY(arg) (_Generic((arg), char*: 1, default: 0) && \
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_Generic(&(arg), char**: 0, default: 1))
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#define IS_UINT8_ARRAY(arg) (_Generic((arg), uint8_t*: 1, default: 0) && \
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_Generic(&(arg), uint8_t**: 0, default: 1))
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static inline int8_t hex2dec(char c) {
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if (c >= 'A' && c <= 'F')
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return c - 'A' + 10;
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else if (c >= 'a' && c <= 'f')
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return c - 'a' + 10;
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else if (c >= '0' && c <= '9')
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return c - '0';
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else
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return -1;
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}
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/*
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* BYTES2HEXSTR converts an array into a hexadecimal string and fills into a
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* given buffer. The buffer size is given as an extra argument.
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*/
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#define BYTES2HEXSTR(array, str, len) ({ \
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static_assert(IS_CHAR_ARRAY(array) || IS_UINT8_ARRAY(array), \
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"`array` must be a char or uint8_t array"); \
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__bytes2hexstr((array), sizeof(array), str, len);})
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/*
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* ALLOCA_BYTES2HEXSTR uses __alloca to allocate a buffer on the current frame
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* and then fills the hexadecimal string into the buffer.
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* This buffer can only be used within the caller frame (function).
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*/
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#define ALLOCA_BYTES2HEXSTR(array) \
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(BYTES2HEXSTR(array, __alloca(sizeof(array) * 2 + 1), sizeof(array) * 2 + 1))
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#endif // HEX_H
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