1 files changed, 59 insertions, 0 deletions
diff --git a/stand/kboot/libkboot/util.c b/stand/kboot/libkboot/util.c
new file mode 100644
index 000000000000..c7fe8b542643
--- /dev/null
+++ b/stand/kboot/libkboot/util.c
@@ -0,0 +1,59 @@
+/*-
+ * Copyright 2022 Netflix, Inc
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include "stand.h"
+#include "host_syscall.h"
+#include "util.h"
+
+bool
+file2str(const char *fn, char *buffer, size_t buflen)
+{
+	int fd;
+	ssize_t len;
+
+	fd = host_open(fn, HOST_O_RDONLY, 0);
+	if (fd == -1)
+		return false;
+	len = host_read(fd, buffer, buflen - 1);
+	if (len < 0) {
+		host_close(fd);
+		return false;
+	}
+	buffer[len] = '\0';
+	/*
+	 * Trim trailing white space
+	 */
+	while (isspace(buffer[len - 1]))
+		buffer[--len] = '\0';
+	host_close(fd);
+	return true;
+}
+
+bool
+file2u64(const char *fn, uint64_t *val)
+{
+	unsigned long long v;
+	char buffer[80];
+
+	if (!file2str(fn, buffer, sizeof(buffer)))
+		return false;
+	v = strtoull(buffer, NULL, 0);	/* XXX check return values? */
+	*val = v;
+	return true;
+}
+
+bool
+file2u32(const char *fn, uint32_t *val)
+{
+	unsigned long v;
+	char buffer[80];
+
+	if (!file2str(fn, buffer, sizeof(buffer)))
+		return false;
+	v = strtoul(buffer, NULL, 0);	/* XXX check return values? */
+	*val = v;
+	return true;
+}