From b4d5e33d6c66593b794c37502e925918220ec9a4 Mon Sep 17 00:00:00 2001
From: Rodrigo Arias <rodrigo.arias@bsc.es>
Date: Fri, 20 Jan 2023 15:36:02 +0100
Subject: [PATCH] Add emu_args parser

---
 src/emu/emu_args.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++
 src/emu/emu_args.h | 15 +++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100644 src/emu/emu_args.c
 create mode 100644 src/emu/emu_args.h

diff --git a/src/emu/emu_args.c b/src/emu/emu_args.c
new file mode 100644
index 0000000..77eb1f0
--- /dev/null
+++ b/src/emu/emu_args.c
@@ -0,0 +1,56 @@
+/* Copyright (c) 2021-2023 Barcelona Supercomputing Center (BSC)
+ * SPDX-License-Identifier: GPL-3.0-or-later */
+
+#define _POSIX_C_SOURCE 2
+
+#include "emu_args.h"
+
+#include "common.h"
+#include <unistd.h>
+#include <string.h>
+
+static char progname[] = "ovniemu";
+
+static void
+usage(void)
+{
+	err("Usage: %s [-c offsetfile] tracedir\n", progname);
+	err("\n");
+	err("Options:\n");
+	err("  -c offsetfile      Use the given offset file to correct\n");
+	err("                     the clocks among nodes. It can be\n");
+	err("                     generated by the ovnisync program\n");
+	err("\n");
+	err("  tracedir           The output trace dir generated by ovni.\n");
+	err("\n");
+	err("The output PRV files are placed in the tracedir directory.\n");
+
+	exit(EXIT_FAILURE);
+}
+
+void
+emu_args_init(struct emu_args *args, int argc, char *argv[])
+{
+	memset(args, 0, sizeof(struct emu_args));
+
+	int opt;
+	while ((opt = getopt(argc, argv, "c:l")) != -1) {
+		switch (opt) {
+			case 'c':
+				args->clock_offset_file = optarg;
+				break;
+			case 'l':
+				args->linter_mode = 1;
+				break;
+			default: /* '?' */
+				usage();
+		}
+	}
+
+	if (optind >= argc) {
+		err("missing tracedir\n");
+		usage();
+	}
+
+	args->tracedir = argv[optind];
+}
diff --git a/src/emu/emu_args.h b/src/emu/emu_args.h
new file mode 100644
index 0000000..7dc17fa
--- /dev/null
+++ b/src/emu/emu_args.h
@@ -0,0 +1,15 @@
+/* Copyright (c) 2021-2023 Barcelona Supercomputing Center (BSC)
+ * SPDX-License-Identifier: GPL-3.0-or-later */
+
+#ifndef EMU_ARGS_H
+#define EMU_ARGS_H
+
+struct emu_args {
+	int linter_mode;
+	char *clock_offset_file;
+	char *tracedir;
+};
+
+void emu_args_init(struct emu_args *args, int argc, char *argv[]);
+
+#endif /* EMU_ARGS_H */