%% options copyright owner = Dirk Krause copyright year = 2015-xxxx license = bsd %% header /** @file Arithmetic operations on int. CRT on Windows: Optional. */ #ifndef DK4CONF_H_INCLUDED #include "dk4conf.h" #endif #ifndef DK4TYPES_H_INCLUDED #include "dk4types.h" #endif #ifndef DK4ERROR_H_INCLUDED #include "dk4error.h" #endif #ifdef __cplusplus extern "C" { #endif /** Absolute value. @param a Operand. @param erp Error report, may be NULL. @return Result on success, INT_MAX if a is INT_MIN (overflow is reported in erp). Error codes: DK4_E_OVERFLOW. */ int dk4ma_int_abs(int a, dk4_er_t *erp); /** Addition. @param a Left operand. @param b Right operand. @param erp Error report, may be NULL. @return Result on success, least significant result bits on overflow (see ec component of erp). Error codes: DK4_E_OVERFLOW. */ int dk4ma_int_add(int a, int b, dk4_er_t *erp); /** Subtraction. @param a Left operand. @param b Right operand. @param erp Error report, may be NULL. @return Result on success, least significant result bits on overflow (see ec component of erp). Error codes: DK4_E_OVERFLOW. */ int dk4ma_int_sub(int a, int b, dk4_er_t *erp); /** Multiplication. @param a Left factor. @param b right factor. @param erp Error report, may be NULL. @return Result on success, least significant bits on overflow (see ec component of erp). Error codes: DK4_E_OVERFLOW. */ int dk4ma_int_mul(int a, int b, dk4_er_t *erp); /** Division. @param a Counter (left operand). @param b Denominator (right operand). @param erp Error report, may be NULL. @return Division result on success, INT_MIN, INT_MAX, or 0 on division by zero or overflow (see the ec component of erp). Error codes: DK4_E_OVERFLOW, DK4_E_DIVZERO. */ int dk4ma_int_div(int a, int b, dk4_er_t *erp); #ifdef __cplusplus } #endif %% module #include "dk4conf.h" #include "dk4types.h" #include "dk4error.h" #include "dk4numco.h" #include "dk4maai.h" int dk4ma_int_abs(int a, dk4_er_t *erp) { if (INT_MIN == a) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } return ((0 <= a) ? a : ((INT_MIN == a) ? INT_MAX : (0 - a))); } int dk4ma_int_add(int a, int b, dk4_er_t *erp) { if ((0 < a) && (0 < b)) { if ((INT_MAX - a) < b) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } else { if ((0 > a) && (0 > b)) { if (INT_MIN == a) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } else { if ((INT_MIN - a) > b) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } } } return (a + b); } int dk4ma_int_sub(int a, int b, dk4_er_t *erp) { if ((0 < a) && (0 > b)) { if ((INT_MAX + b) < a) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } else { if ((0 > a) && (0 < b)) { if ((INT_MIN + b) > a) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } } return (a - b); } int dk4ma_int_mul(int a, int b, dk4_er_t *erp) { if ((0 != a) && (0 != b)) { if (INT_MIN == a) { if (1 != b) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } else { if (INT_MIN == b) { if (1 != a) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } else { if (0 < a) { if (0 < b) { if ((INT_MAX / a) < b) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } else { if ((INT_MIN / a) > b) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } } else { if (0 < b) { if ((INT_MIN / b) > a) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } else { if ((INT_MAX / (0 - a)) < (0 - b)) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } } } } } return (a * b); } int dk4ma_int_div(int a, int b, dk4_er_t *erp) { int back = 0; if (0 != b) { if ((INT_MIN == a) && (-1 == b)) { back = INT_MAX; dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } else { back = a / b; } } else { if (0 < a) { back = INT_MAX; } else { if (0 > a) { back = INT_MIN; } } dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO); } return back; }