56 lines
816 B
C
56 lines
816 B
C
/*
|
|
* utils.c
|
|
*
|
|
* Copyright (C) 2019-2023 Sylvain Munaut <tnt@246tNt.com>
|
|
* SPDX-License-Identifier: LGPL-3.0-or-later
|
|
*/
|
|
|
|
#include <stdarg.h>
|
|
#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;
|
|
}
|
|
|
|
uint8_t
|
|
hexval(char c)
|
|
{
|
|
if (c >= '0' && c <= '9')
|
|
return c - '0';
|
|
else if (c >= 'a' && c <= 'f')
|
|
return 10 + (c - 'a');
|
|
else if (c >= 'A' && c <= 'F')
|
|
return 10 + (c - 'A');
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
uint16_t
|
|
rand16()
|
|
{
|
|
static uint32_t rng = 1234;
|
|
rng = (rng * 22695477) + 1;
|
|
return rng >> 12;
|
|
}
|