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/* SPDX-License-Identifier: MIT
* Copyright (c) 2026 Leah Rowe <leah@libreboot.org>
*
* Non-randomisation-related numerical functions.
* For rand functions, see: rand.c
*/
#ifdef __OpenBSD__
#include <sys/param.h>
#endif
#include <sys/types.h>
#include <errno.h>
#if !((defined(__OpenBSD__) && (OpenBSD) >= 201) || \
defined(__FreeBSD__) || \
defined(__NetBSD__) || defined(__APPLE__))
#include <fcntl.h> /* if not arc4random: /dev/urandom */
#endif
#include <ctype.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "../include/common.h"
unsigned short
hextonum(char ch_s)
{
int saved_errno = errno;
unsigned char ch;
size_t rval;
ch = (unsigned char)ch_s;
if ((unsigned int)(ch - '0') <= 9)
return ch - '0';
ch |= 0x20;
if ((unsigned int)(ch - 'a') <= 5)
return ch - 'a' + 10;
if (ch == '?' || ch == 'x')
return rsize(16); /* <-- with rejection sampling! */
return 16;
}
/* basically hexdump -C */
void
spew_hex(const void *data, size_t len)
{
const unsigned char *buf = (const unsigned char *)data;
unsigned char c;
size_t i;
size_t j;
if (buf == NULL ||
len == 0)
return;
for (i = 0; i < len; i += 16) {
printf("%08zx ", i);
for (j = 0; j < 16; j++) {
if (i + j < len)
printf("%02x ", buf[i + j]);
else
printf(" ");
if (j == 7)
printf(" ");
}
printf(" |");
for (j = 0; j < 16 && i + j < len; j++) {
c = buf[i + j];
printf("%c", isprint(c) ? c : '.');
}
printf("|\n");
}
printf("%08zx\n", len);
}
void
check_bin(size_t a, const char *a_name)
{
if (a > 1)
err_exit(EINVAL, "%s must be 0 or 1, but is %lu",
a_name, (size_t)a);
}
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