nvmutil: split nvmutil.c into multiple files

this is a big program now. act like it.

Signed-off-by: Leah Rowe <leah@libreboot.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/util/nvmutil/usage.c b/util/nvmutil/usage.c
new file mode 100644
index 00000000..867e4c44
--- /dev/null
+++ b/util/nvmutil/usage.c
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (c) 2023 Riku Viitanen <riku.viitanen@protonmail.com>
+ * Copyright (c) 2026 Leah Rowe <leah@libreboot.org>
+ *
+ */
+
+#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"
+
+void
+usage(void)
+{
+	const char *util;
+
+	util = getnvmprogname();
+
+	fprintf(stderr,
+	    "Modify Intel GbE NVM images e.g. set MAC\n"
+	    "USAGE:\n"
+	    "\t%s FILE dump\n"
+	    "\t%s FILE setmac [MAC]\n"
+	    "\t%s FILE swap\n"
+	    "\t%s FILE copy 0|1\n"
+	    "\t%s FILE cat\n"
+	    "\t%s FILE cat16\n"
+	    "\t%s FILE cat128\n",
+	    util, util, util, util,
+	    util, util, util);
+
+	err(EINVAL, "Too few arguments");
+}