From a3354664507365226f7ae2849488845b2e0f1149 Mon Sep 17 00:00:00 2001
From: christoph <christoph@blackcoalstudio.com>
Date: Wed, 4 Feb 2015 18:23:38 +0100
Subject: [PATCH] Fix invalid write in dopr(...)

Fix an invalid write in dopr(...) that occured when maxlen == 0 and
buffer != 0 since 0-1 > 0 using size_t.
---
 src/snprintf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/snprintf.c b/src/snprintf.c
index bd1cdc3..61b038b 100644
--- a/src/snprintf.c
+++ b/src/snprintf.c
@@ -397,7 +397,7 @@ static int dopr (char *buffer, size_t maxlen, const char *format, va_list args)
       break; /* some picky compilers need this */
     }
   }
-  if (buffer != NULL)
+  if (buffer != NULL && maxlen > 0)
   {
     if (currlen < maxlen - 1) 
       buffer[currlen] = '\0';