1 files changed, 103 insertions, 0 deletions
diff --git a/util/nvmutil/lib/num.c b/util/nvmutil/lib/num.c
new file mode 100644
index 00000000..dd6e9901
--- /dev/null
+++ b/util/nvmutil/lib/num.c
@@ -0,0 +1,103 @@
+/* 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);
+}