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b138abb540
Introduces the translation stage fod the ARM32 interpreter and significantly hardens the application's core logic to meet my high integrity standards. - translator.c converts raw ARM32 guest code into an array of interpreter op-codes - main.c was completly rewritten to be as safe as possible. - pmath.h provides safe, checked arithmetic functions to prevent integer overflow. - adds binary files in src/ for testing the interpreter. Signed-off-by: Ronald Caesar <github43132@proton.me>
67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
#ifndef POUND_COMMON_MATH_H
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#define POUND_COMMON_MATH_H
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#include <stddef.h>
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#include <stdbool.h>
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/*!
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* @brief Performs a checked multiplication of two `size_t` values.
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*
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* @details
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* Calculates `a * b` and stores the result in the variable pointed to by `res`.
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*
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* @param[in] a
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* The multiplicand.
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* @param[in] b
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* The multiplier.
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* @param[out] res
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* Pointer to the destination variable.
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* **Precondition:** Must not be NULL.
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* **Postcondition:** On success, contains `a * b`. On overflow, value is undefined.
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*
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* @retval false
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* Success. The multiplication was performed safely.
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* @retval true
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* **Overflow Detected.** The result exceeds `SIZE_MAX`.
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*/
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static inline bool safe_multiply_size_t(size_t a, size_t b, size_t* res)
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{
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#if defined(__GNUC__) || defined(__clang__)
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return __builtin_mul_overflow(a, b, res);
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#else
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if (b > 0 && a > SIZE_MAX / b) return true;
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*res = a * b;
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return false;
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#endif
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}
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/*!
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* @brief Performs a checked addition of two `size_t` values.
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*
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* @details
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* Calculates `a + b` and stores the result in the variable pointed to by `res`.
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*
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* @param[in] a
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* The first addend.
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* @param[in] b
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* The second addend.
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* @param[out] res
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* Pointer to the destination variable.
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* **Precondition:** Must not be NULL.
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* **Postcondition:** On success, contains `a + b`. On overflow, value is undefined.
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*
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* @retval false
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* Success. The addition was performed safely.
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* @retval true
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* **Overflow Detected.** The result exceeds `SIZE_MAX`.
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*/
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static inline bool safe_add_size_t(size_t a, size_t b, size_t* res)
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{
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#if defined(__GNUC__) || defined(__clang__)
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return __builtin_add_overflow(a, b, res);
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#else
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if (a > SIZE_MAX - b) return true;
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*res = a + b;
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return false;
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#endif
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}
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#endif // POUND_COMMON_MATH_H
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