Make string_util::WriteInto() DCHECK() that the supplied |length_with_null| > 1, meaning that the...

base/rand_util.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_RAND_UTIL_H_
 #define BASE_RAND_UTIL_H_
 #pragma once
 
 #include <string>
 
@@ skipping 20 matching lines @@
 
 // Given input |bits|, convert with maximum precision to a double in
 // the range [0, 1). Thread-safe.
 BASE_EXPORT double BitsToOpenEndedUnitInterval(uint64 bits);
 
 // Fills |output_length| bytes of |output| with cryptographically strong random
 // data.
 BASE_EXPORT void RandBytes(void* output, size_t output_length);
 
 // Fills a string of length |length| with with cryptographically strong random
-// data and returns it.
+// data and returns it.  |length| should be nonzero.
 //
-// Not that this is a variation of |RandBytes| with a different return type.
+// Note that this is a variation of |RandBytes| with a different return type.
 BASE_EXPORT std::string RandBytesAsString(size_t length);
 
 }  // namespace base
 
 #endif  // BASE_RAND_UTIL_H_