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>

dump2tar/src/strarray.c

@@ -0,0 +1,83 @@
+/*
+ * dump2tar - tool to dump files and command output into a tar archive
+ *
+ * Dynamically growing string arrays
+ *
+ * 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 <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "misc.h"
+#include "strarray.h"
+
+/* Release resources associated with string array @array */
+void free_strarray(struct strarray *array)
+{
+	unsigned int i;
+
+	for (i = 0; i < array->num; i++)
+		free(array->str[i]);
+	free(array->str);
+	array->str = NULL;
+	array->num = 0;
+}
+
+/* Add string @str to string array @array */
+void add_str_to_strarray(struct strarray *array, const char *str)
+{
+	array->str = mrealloc(array->str, sizeof(char *) * (array->num + 2));
+	array->str[array->num + 1] = NULL;
+	array->str[array->num] = mstrdup(str);
+	array->num++;
+}
+
+/* Add string resulting from @fmt and additional arguments to @array */
+void add_vstr_to_strarray(struct strarray *array, const char *fmt, ...)
+{
+	va_list args;
+	char *str;
+
+	va_start(args, fmt);
+	util_vasprintf(&str, fmt, args);
+	va_end(args);
+
+	array->str = mrealloc(array->str, sizeof(char *) * (array->num + 2));
+	array->str[array->num + 1] = NULL;
+	array->str[array->num] = str;
+	array->num++;
+}
+
+/* Add all lines in file at @filename to @array */
+int add_file_to_strarray(struct strarray *array, const char *filename)
+{
+	FILE *fd;
+	char *line = NULL;
+	size_t line_size;
+	int rc = EXIT_OK;
+
+	fd = fopen(filename, "r");
+	if (!fd) {
+		mwarn("%s: Cannot open file", filename);
+		return EXIT_RUNTIME;
+	}
+
+	while (!feof(fd) && !ferror(fd)) {
+		if (getline(&line, &line_size, fd) == -1)
+			continue;
+		chomp(line, "\n");
+		add_str_to_strarray(array, line);
+	}
+	if (ferror(fd))
+		rc = EXIT_RUNTIME;
+	free(line);
+
+	fclose(fd);
+
+	return rc;
+}