math: extras: Add overflow functions to u16 (4e8e72bd) · Commits · Wenxi XU / zephyr

include/sys/math_extras.h

+2 −0

Changes for include/sys/math_extras.h: 2 added lines, 0 removed lines.
Original line number	Diff line number	Diff line
		@@ -28,6 +28,7 @@
		* true if the operation overflowed.
		*/
		/*@{/
		static bool u16_add_overflow(u16_t a, u16_t b, u16_t *result);
		static bool u32_add_overflow(u32_t a, u32_t b, u32_t *result);
		static bool u64_add_overflow(u64_t a, u64_t b, u64_t *result);
		static bool size_add_overflow(size_t a, size_t b, size_t *result);
		@@ -40,6 +41,7 @@ static bool size_add_overflow(size_t a, size_t b, size_t *result);
		* true if the operation overflowed.
		*/
		/*@{/
		static bool u16_mul_overflow(u16_t a, u16_t b, u16_t *result);
		static bool u32_mul_overflow(u32_t a, u32_t b, u32_t *result);
		static bool u64_mul_overflow(u64_t a, u64_t b, u64_t *result);
		static bool size_mul_overflow(size_t a, size_t b, size_t *result);

include/sys/math_extras_impl.h

+28 −0

Changes for include/sys/math_extras_impl.h: 28 added lines, 0 removed lines.
Original line number	Diff line number	Diff line
		@@ -29,6 +29,11 @@
		#endif

		#if use_builtin(__builtin_add_overflow)
		static inline bool u16_add_overflow(u16_t a, u16_t b, u16_t *result)
		{
		return __builtin_add_overflow(a, b, result);
		}

		static inline bool u32_add_overflow(u32_t a, u32_t b, u32_t *result)
		{
		return __builtin_add_overflow(a, b, result);
		@@ -44,6 +49,15 @@ static inline bool size_add_overflow(size_t a, size_t b, size_t *result)
		return __builtin_add_overflow(a, b, result);
		}
		#else /* !use_builtin(__builtin_add_overflow) */
		static inline bool u16_add_overflow(u16_t a, u16_t b, u16_t *result)
		{
		u16_t c = a + b;

		*result = c;

		return c < a;
		}

		static inline bool u32_add_overflow(u32_t a, u32_t b, u32_t *result)
		{
		u32_t c = a + b;
		@@ -73,6 +87,11 @@ static inline bool size_add_overflow(size_t a, size_t b, size_t *result)
		#endif /* use_builtin(__builtin_add_overflow) */

		#if use_builtin(__builtin_mul_overflow)
		static inline bool u16_mul_overflow(u16_t a, u16_t b, u16_t *result)
		{
		return __builtin_mul_overflow(a, b, result);
		}

		static inline bool u32_mul_overflow(u32_t a, u32_t b, u32_t *result)
		{
		return __builtin_mul_overflow(a, b, result);
		@@ -88,6 +107,15 @@ static inline bool size_mul_overflow(size_t a, size_t b, size_t *result)
		return __builtin_mul_overflow(a, b, result);
		}
		#else /* !use_builtin(__builtin_mul_overflow) */
		static inline bool u16_mul_overflow(u16_t a, u16_t b, u16_t *result)
		{
		u16_t c = a * b;

		*result = c;

		return a != 0 && (c / a) != b;
		}

		static inline bool u32_mul_overflow(u32_t a, u32_t b, u32_t *result)
		{
		u32_t c = a * b;

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