Ensure termination in Windows vsnprintf wrapper

The Windows _vsnprintf does not terminate its output buffer in the
overflow case.  Make sure we do that in the wrapper.  Reported by
Chris Hecker.

(Not an issue for KfW 3.2 since we weren't using snprintf in 1.6.x
except in Unix-specific code.)

ticket: 6980
target_version: 1.10
tags: pullup

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@25367 dc483132-0cff-0310-8789-dd5450dbe970

diff --git a/src/include/k5-platform.h b/src/include/k5-platform.h
index 77d710b499a388be42a1258b03283470b7863e3a..d1896e7f8f156180d430a433491598cf70d54b38 100644 (file)
--- a/src/include/k5-platform.h
+++ b/src/include/k5-platform.h
@@ -958,8 +958,10 @@ vsnprintf(char *str, size_t size, const char *format, va_list args)
     va_copy(args_copy, args);
     length = _vscprintf(format, args_copy);
     va_end(args_copy);
-    if (size)
+    if (size > 0) {
         _vsnprintf(str, size, format, args);
+        str[size - 1] = '\0';
+    }
     return length;
 }
 static inline int