--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dmstring.c	Fri Sep 28 01:54:23 2012 +0300
@@ -0,0 +1,61 @@
+#include "dmlib.h"
+#include <stdarg.h>
+
+/* strdup with a NULL check
+ */
+char *dm_strdup(const char *s)
+{
+    char *res;
+    if (s == NULL)
+        return NULL;
+
+    if ((res = dmMalloc(strlen(s) + 1)) == NULL)
+        return NULL;
+
+    strcpy(res, s);
+    return res;
+}
+
+
+/* Simulate a sprintf() that allocates memory
+ */
+char *dm_strdup_vprintf(const char *fmt, va_list args)
+{
+    int size = 64;
+    char *buf;
+
+    if ((buf = dmMalloc(size)) == NULL)
+        return NULL;
+
+    while (1)
+    {
+        int n;
+        va_list ap;
+        va_copy(ap, args);
+        n = vsnprintf(buf, size, fmt, ap);
+        va_end(ap);
+
+        if (n > -1 && n < size)
+            return buf;
+        if (n > -1)
+            size = n + 1;
+        else
+            size *= 2;
+
+        if ((buf = dmRealloc(buf, size)) == NULL)
+            return NULL;
+    }
+}
+
+
+char *dm_strdup_printf(const char *fmt, ...)
+{
+    char *res;
+    va_list ap;
+
+    va_start(ap, fmt);
+    res = dm_strdup_vprintf(fmt, ap);
+    va_end(ap);
+
+    return res;
+}