doom_riscv/projects/riscv_usb/fw/utils.c

/*
 * utils.c
 *
 * Copyright (C) 2019 Sylvain Munaut
 * All rights reserved.
 *
 * LGPL v3+, see LICENSE.lgpl3
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include <stdint.h>
#include <stdbool.h>

char *
hexstr(void *d, int n, bool space)
{
	static const char * const hex = "0123456789abcdef";
	static char buf[96];
	uint8_t *p = d;
	char *s = buf;
	char c;

	while (n--) {
		c = *p++;
		*s++ = hex[c >> 4];
		*s++ = hex[c & 0xf];
		if (space)
			*s++ = ' ';
	}

	s[space?-1:0] = '\0';

	return buf;
}