Initial s390-tools-2.0.0 import

This commit is based on the s390-tools-1.39.0 version.

Changes on top of s390-tools-1.39.0:

 - Add MIT license to all source files
 - Add LICENSE file
 - Transform REAMDE to README.md (markdown)
 - Add AUTHORS.md file
 - Add CONTRIBUTING.md file
 - Move changelog from README to CHANGELOG.md file

Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>

zdev/src/opts.c

@@ -0,0 +1,55 @@
+/*
+ * zdev - Modify and display the persistent configuration of devices
+ *
+ * Copyright IBM Corp. 2016, 2017
+ *
+ * s390-tools is free software; you can redistribute it and/or modify
+ * it under the terms of the MIT license. See LICENSE for details.
+ */
+
+#include <getopt.h>
+
+#include "misc.h"
+#include "opts.h"
+
+static const char *get_name(const struct option *opt_list, int op)
+{
+	int i;
+
+	for (i = 0; opt_list[i].name; i++) {
+		if (opt_list[i].val == op)
+			break;
+	}
+
+	return opt_list[i].name;
+}
+
+exit_code_t opts_check_conflict(int op, int selected[OPTS_MAX + 1],
+				struct opts_conflict *conf_list,
+				const struct option *opt_list)
+{
+	int i, j, b;
+
+	for (i = 0; conf_list[i].op; i++) {
+		for (j = 0; conf_list[i].conflicts[j]; j++) {
+			if (conf_list[i].op == op &&
+			    selected[conf_list[i].conflicts[j]]) {
+				b = conf_list[i].conflicts[j];
+				goto err;
+			}
+			if (conf_list[i].conflicts[j] == op &&
+			    selected[conf_list[i].op]) {
+				b = conf_list[i].op;
+				goto err;
+			}
+		}
+	}
+
+	return EXIT_OK;
+
+err:
+	error("Cannot specify '--%s' together with '--%s'\n",
+	      get_name(opt_list, op), get_name(opt_list, b));
+
+	return EXIT_USAGE_ERROR;
+}