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21 lines
566 B
C
21 lines
566 B
C
/* Copyright (c) 2003-2004, Roger Dingledine
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* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
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* Copyright (c) 2007-2018, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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#include "lib/intmath/addsub.h"
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#include "lib/cc/compat_compiler.h"
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/* Helper: safely add two uint32_t's, capping at UINT32_MAX rather
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* than overflow */
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uint32_t
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tor_add_u32_nowrap(uint32_t a, uint32_t b)
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{
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/* a+b > UINT32_MAX check, without overflow */
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if (PREDICT_UNLIKELY(a > UINT32_MAX - b)) {
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return UINT32_MAX;
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} else {
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return a+b;
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}
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}
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