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8c22bd9ee1
For future reference, done via: for f in `find wire/ bitcoin/ common/ lightningd -name '*.h' ! -name 'gen*'`; do ID=`echo -n LIGHTNING/$f | tr 'a-z' 'A-Z' | tr -cs 'A-Z0-9' _`; sed 's/^#\(ifndef\|define\) .*_H$/#\1 '$ID/ < $f | sed 's,#endif /..*_H ./$,#endif /* '$ID' */,' | bagto $f; done Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
35 lines
652 B
C
35 lines
652 B
C
#ifndef LIGHTNING_COMMON_OVERFLOWS_H
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#define LIGHTNING_COMMON_OVERFLOWS_H
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#include "config.h"
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static inline bool add_overflows_size_t(uint64_t a, uint64_t b)
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{
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return (size_t)a != a || (size_t)b != b || (a + b) < (size_t)a;
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}
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static inline bool add_overflows_u64(uint64_t a, uint64_t b)
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{
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return (a + b) < a;
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}
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static inline bool mul_overflows_s64(int64_t a, int64_t b)
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{
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int64_t ret;
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if (a == 0)
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return false;
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ret = a * b;
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return (ret / a != b);
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}
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static inline bool mul_overflows_u64(uint64_t a, uint64_t b)
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{
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uint64_t ret;
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if (a == 0)
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return false;
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ret = a * b;
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return (ret / a != b);
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}
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#endif /* LIGHTNING_COMMON_OVERFLOWS_H */
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