diff --git a/vsnprintf.c b/vsnprintf.c.new
index 1e4cdc5..9b15535 100644
--- a/vsnprintf.c
+++ b/vsnprintf.c.new
@@ -1210,6 +1210,7 @@ cvt(double value, int ndigits, int flags, char *sign, int *decpt, int ch, int *l
 {
 	int mode, dsgn;
 	char *digits, *bp, *rve;
+        static char *buffer = NULL;
 
 	if (ch == 'f')
 		mode = 3;
@@ -1232,11 +1233,12 @@ cvt(double value, int ndigits, int flags, char *sign, int *decpt, int ch, int *l
 	else {
 	    digits = BSD__dtoa(value, mode, ndigits, decpt, &dsgn, &rve);
 	}
-	buf[0] = 0; /* rve - digits may be 0 */
-	memcpy(buf, digits, rve - digits);
+        buffer = xrealloc(buffer,rve - digits + 1);
+	buffer[0] = 0; /* rve - digits may be 0 */
+	memcpy(buffer, digits, rve - digits);
+	rve = buffer + (rve - digits);
 	xfree(digits);
-	rve = buf + (rve - digits);
-	digits = buf;
+        digits = buffer;
 	if (flags & ALT) {	/* Print trailing zeros */
 		bp = digits + ndigits;
 		if (ch == 'f') {
@@ -1244,6 +1246,12 @@ cvt(double value, int ndigits, int flags, char *sign, int *decpt, int ch, int *l
 				*decpt = -ndigits + 1;
 			bp += *decpt;
 		}
+                if(rve < bp) {
+                        buffer = xrealloc(buffer,bp - buffer + 1);
+                        rve = buffer + (rve - digits);
+                        bp = buffer + (bp - digits);
+                        digits = buffer;
+                }
 		while (rve < bp)
 			*rve++ = '0';
 	}