--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/port/asprintf.c	Mon Feb 13 09:52:28 2012 +0100
@@ -0,0 +1,60 @@
+/*
+ * asprintf.c -- basic port of asprintf / vsprintf functions
+ *
+ * Copyright (c) 2011, 2012 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+
+#define BASE	80	
+
+int
+vasprintf(char **res, const char *format, va_list ap)
+{
+	int rvalue, ok;
+	size_t base = BASE;
+
+	if ((*res = malloc(base)) == NULL)
+		return -1;
+
+	ok = 0;
+	do {
+		rvalue = vsnprintf(*res, base, format, ap);
+
+		if ((signed int)base <= rvalue || rvalue <= 0) {
+			*res = realloc(*res, base + BASE);
+			base += BASE;
+		} else
+			ok = 1;
+	} while (!ok && *res != NULL);
+
+	return rvalue;
+}
+
+int
+asprintf(char **res, const char *fmt, ...)
+{
+	va_list ap;
+	int rvalue;
+
+	va_start(ap, fmt);
+	rvalue = xvasprintf(res, fmt, ap);
+	va_end(ap);
+
+	return rvalue;
+}