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/* SPDX-License-Identifier: MIT
*
* Copyright (c) 2026 Leah Rowe <leah@libreboot.org>
*
* Numerical functions.
*/
#ifdef __OpenBSD__
#include <sys/param.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "../include/common.h"
unsigned short
hextonum(char ch_s)
{
unsigned char ch;
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 (unsigned short)rlong() & 0xf;
return 16; /* invalid character */
}
/*
* Portable random
* number generator
*/
unsigned long
rlong(void)
{
#if (defined(__OpenBSD__) && (OpenBSD) >= 201) || \
defined(__FreeBSD__) || \
defined(__NetBSD__) || defined(__APPLE__)
unsigned long rval;
arc4random_buf(&rval, sizeof(unsigned long));
return rval;
#else
int fd;
long nr;
unsigned long rval;
fd = open("/dev/urandom", O_RDONLY | O_BINARY);
#ifdef __OpenBSD__
if (fd < 0) /* old openbsd */
fd = open("/dev/arandom", O_RDONLY | O_BINARY);
#endif
if (fd < 0)
fd = open("/dev/random", O_RDONLY | O_BINARY);
if (fd < 0)
err(errno, "can't open random device");
nr = rw_file_exact(fd, (unsigned char *)&rval,
sizeof(unsigned long), 0, IO_READ, LOOP_EAGAIN,
LOOP_EINTR, MAX_ZERO_RW_RETRY, OFF_ERR);
if (x_i_close(fd) < 0)
err(errno, "Can't close randomness fd");
if (nr != sizeof(unsigned long))
err(errno, "Incomplete read from random device");
return rval;
#endif
}
void
check_bin(unsigned long a, const char *a_name)
{
if (a > 1)
err(EINVAL, "%s must be 0 or 1, but is %lu",
a_name, (unsigned long)a);
}
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