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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,90 +1,14 @@ | ||
| #ifndef BLINK_CHECKED_H_ | ||
| #define BLINK_CHECKED_H_ | ||
| #ifndef EASYCKDINT_H_ | ||
| #define EASYCKDINT_H_ | ||
| #if defined(__has_include) && __has_include(<stdckdint.h>) | ||
| #include <stdckdint.h> | ||
| #elif defined(NDEBUG) && \ | ||
| ((defined(__GNUC__) && __GNUC__ >= 5 && !defined(__ICC)) || \ | ||
| (defined(__has_builtin) && (__has_builtin(__builtin_add_overflow) && \ | ||
| __has_builtin(__builtin_sub_overflow) && \ | ||
| __has_builtin(__builtin_mul_overflow)))) | ||
| #else | ||
|
|
||
| #define __STDC_VERSION_STDCKDINT_H__ 202311L | ||
|
|
||
| #define ckd_add(res, x, y) __builtin_add_overflow((x), (y), (res)) | ||
| #define ckd_sub(res, x, y) __builtin_sub_overflow((x), (y), (res)) | ||
| #define ckd_mul(res, x, y) __builtin_mul_overflow((x), (y), (res)) | ||
|
|
||
| #else | ||
| #include <limits.h> | ||
| #include <stdint.h> | ||
|
|
||
| #define ckd_add(res, x, y) __ckd_arithmetic(add, res, x, y) | ||
| #define ckd_sub(res, x, y) __ckd_arithmetic(sub, res, x, y) | ||
| #define ckd_mul(res, x, y) __ckd_arithmetic(mul, res, x, y) | ||
|
|
||
| #define __ckd_arithmetic(op, res, x, y) \ | ||
| (sizeof(*(res)) == sizeof(int) ? __ckd_##op((int *)(res), x, y) \ | ||
| : sizeof(*(res)) == sizeof(long long) \ | ||
| ? __ckd_##op##ll((long long *)(res), x, y) \ | ||
| : __ckd_trap()) | ||
|
|
||
| #define __ckd_mul_overflow(x, y, min, max) \ | ||
| if (x > 0) { \ | ||
| if (y > 0) { \ | ||
| if (x > max / y) { \ | ||
| return 1; \ | ||
| } \ | ||
| } else { \ | ||
| if (y < min / x) { \ | ||
| return 1; \ | ||
| } \ | ||
| } \ | ||
| } else { \ | ||
| if (y > 0) { \ | ||
| if (x < min / y) { \ | ||
| return 1; \ | ||
| } \ | ||
| } else { \ | ||
| if (x && y < max / x) { \ | ||
| return 1; \ | ||
| } \ | ||
| } \ | ||
| } \ | ||
| return 0 | ||
|
|
||
| static inline int __ckd_trap(void) { | ||
| volatile int __x = 0; | ||
| return 1 / __x; | ||
| } | ||
|
|
||
| static inline int __ckd_add(int *__z, int __x, int __y) { | ||
| unsigned int __a, __b, __c; | ||
| *__z = __c = (__a = __x) + (__b = __y); | ||
| return ((__c ^ __a) & (__c ^ __b)) >> (sizeof(int) * CHAR_BIT - 1); | ||
| } | ||
| static inline int __ckd_addll(long long *__z, long long __x, long long __y) { | ||
| unsigned long long __a, __b, __c; | ||
| *__z = __c = (__a = __x) + (__b = __y); | ||
| return ((__c ^ __a) & (__c ^ __b)) >> (sizeof(long long) * CHAR_BIT - 1); | ||
| } | ||
|
|
||
| static inline int __ckd_sub(int *__z, int __x, int __y) { | ||
| unsigned int __a, __b, __c; | ||
| *__z = __c = (__a = __x) - (__b = __y); | ||
| return ((__a ^ __b) & (__c ^ __a)) >> (sizeof(int) * CHAR_BIT - 1); | ||
| } | ||
| static inline int __ckd_subll(long long *__z, long long __x, long long __y) { | ||
| unsigned long long __a, __b, __c; | ||
| *__z = __c = (__a = __x) - (__b = __y); | ||
| return ((__a ^ __b) & (__c ^ __a)) >> (sizeof(long long) * CHAR_BIT - 1); | ||
| } | ||
|
|
||
| static inline int __ckd_mul(int *__z, int __x, int __y) { | ||
| *__z = (unsigned)__x * (unsigned)__y; | ||
| __ckd_mul_overflow(__x, __y, INT_MIN, INT_MAX); | ||
| } | ||
| static inline int __ckd_mulll(long long *__z, long long __x, long long __y) { | ||
| *__z = (unsigned long long)__x * (unsigned long long)__y; | ||
| __ckd_mul_overflow(__x, __y, LLONG_MIN, LLONG_MAX); | ||
| } | ||
|
|
||
| #endif | ||
| #endif /* BLINK_CHECKED_H_ */ | ||
| #endif /* <stdckdint.h> */ | ||
| #endif /* EASYCKDINT_H_ */ |
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