diff --git a/dosfstools/src/common.c b/dosfstools/src/common.c
new file mode 100644
index 0000000..51605a2
--- /dev/null
+++ b/dosfstools/src/common.c
@@ -0,0 +1,118 @@
+/* common.c - Common functions
+
+   Copyright (C) 1993 Werner Almesberger <werner.almesberger@lrc.di.epfl.ch>
+   Copyright (C) 1998 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+   On Debian systems, the complete text of the GNU General Public License
+   can be found in /usr/share/common-licenses/GPL-3 file.
+*/
+
+/* FAT32, VFAT, Atari format support, and various fixes additions May 1998
+ * by Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <errno.h>
+
+#include "common.h"
+
+typedef struct _link {
+    void *data;
+    struct _link *next;
+} LINK;
+
+void die(char *msg, ...)
+{
+    va_list args;
+
+    va_start(args, msg);
+    vfprintf(stderr, msg, args);
+    va_end(args);
+    fprintf(stderr, "\n");
+    exit(1);
+}
+
+void pdie(char *msg, ...)
+{
+    va_list args;
+
+    va_start(args, msg);
+    vfprintf(stderr, msg, args);
+    va_end(args);
+    fprintf(stderr, ":%s\n", strerror(errno));
+    exit(1);
+}
+
+void *alloc(int size)
+{
+    void *this;
+
+    if ((this = malloc(size)))
+	return this;
+    pdie("malloc");
+    return NULL;		/* for GCC */
+}
+
+void *qalloc(void **root, int size)
+{
+    LINK *link;
+
+    link = alloc(sizeof(LINK));
+    link->next = *root;
+    *root = link;
+    return link->data = alloc(size);
+}
+
+void qfree(void **root)
+{
+    LINK *this;
+
+    while (*root) {
+	this = (LINK *) * root;
+	*root = this->next;
+	free(this->data);
+	free(this);
+    }
+}
+
+int min(int a, int b)
+{
+    return a < b ? a : b;
+}
+
+char get_key(char *valid, char *prompt)
+{
+    int ch, okay;
+
+    while (1) {
+	if (prompt)
+	    printf("%s ", prompt);
+	fflush(stdout);
+	while (ch = getchar(), ch == ' ' || ch == '\t') ;
+	if (ch == EOF)
+	    exit(1);
+	if (!strchr(valid, okay = ch))
+	    okay = 0;
+	while (ch = getchar(), ch != '\n' && ch != EOF) ;
+	if (ch == EOF)
+	    exit(1);
+	if (okay)
+	    return okay;
+	printf("Invalid input.\n");
+    }
+}