--- a/dmlib.h	Mon Apr 22 17:00:01 2013 +0300
+++ b/dmlib.h	Sat May 04 03:25:29 2013 +0300
@@ -390,6 +390,7 @@
 const char *dmErrorStr(int error);
 
 char *     dm_strdup(const char *);
+char *     dm_strndup(const char *, const size_t n);
 char *     dm_strdup_vprintf(const char *, va_list);
 char *     dm_strdup_printf(const char *, ...);
 

--- a/dmstring.c	Mon Apr 22 17:00:01 2013 +0300
+++ b/dmstring.c	Sat May 04 03:25:29 2013 +0300
@@ -1,7 +1,7 @@
 #include "dmlib.h"
 #include <stdarg.h>
 
-/* strdup with a NULL check
+/* Implementation of strdup() with a NULL check
  */
 char *dm_strdup(const char *s)
 {
@@ -17,6 +17,28 @@
 }
 
 
+/* Implementation of strndup() with NULL check
+ */
+char *dm_strndup(const char *s, const size_t n)
+{
+    char *res;
+    if (s == NULL)
+        return NULL;
+
+    size_t len = strlen(s);
+    if (len > n)
+        len = n;
+
+    if ((res = dmMalloc(len + 1)) == NULL)
+        return NULL;
+
+    memcpy(res, s, len);
+    res[len] = 0;
+
+    return res;
+}
+
+
 /* Simulate a sprintf() that allocates memory
  */
 char *dm_strdup_vprintf(const char *fmt, va_list args)