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overflows.h (884B)

      1 #ifndef LIGHTNING_COMMON_OVERFLOWS_H
      2 #define LIGHTNING_COMMON_OVERFLOWS_H
      3 #include "../config.h"
      4 #include "ccan/short_types/short_types.h"
      5 
      6 static inline bool add_overflows_size_t(uint64_t a, uint64_t b)
      7 {
      8     return (size_t)a != a || (size_t)b != b || (a + b) < (size_t)a;
      9 }
     10 
     11 static inline bool add_overflows_u64(uint64_t a, uint64_t b)
     12 {
     13     return (a + b) < a;
     14 }
     15 
     16 static inline bool mul_overflows_u64(uint64_t a, uint64_t b)
     17 {
     18     uint64_t ret;
     19 
     20     if (a == 0)
     21         return false;
     22     ret = a * b;
     23     return (ret / a != b);
     24 }
     25 
     26 static inline bool assign_overflow_u8(u8 *dst, uint64_t v)
     27 {
     28     *dst = v;
     29     return *dst == v;
     30 }
     31 
     32 static inline bool assign_overflow_u16(u16 *dst, uint64_t v)
     33 {
     34     *dst = v;
     35     return *dst == v;
     36 }
     37 
     38 static inline bool assign_overflow_u32(u32 *dst, uint64_t v)
     39 {
     40     *dst = (u32)v;
     41     return *dst == v;
     42 }
     43 #endif /* LIGHTNING_COMMON_OVERFLOWS_H */