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authorJonathan Nieder <jrnieder@gmail.com>2010-10-11 02:59:26 (GMT)
committerJunio C Hamano <gitster@pobox.com>2011-02-10 21:47:56 (GMT)
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compat: helper for detecting unsigned overflow
The idiom (a + b < a) works fine for detecting that an unsigned integer has overflowed, but a more explicit unsigned_add_overflows(a, b) might be easier to read. Define such a macro, expanding roughly to ((a) < UINT_MAX - (b)). Because the expansion uses each argument only once outside of sizeof() expressions, it is safe to use with arguments that have side effects. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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