%% options copyright owner = Dirk Krause copyright year = 2015-xxxx license = bsd %% header /** @file Arithmetic operations on long long. 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 #if DK4_HAVE_LONG_LONG /** Absolute value. @param a Operand. @param erp Error report, may be NULL. @return Result on success, LLONG_MAX if a is LLONG_MIN (overflow is reported in erp). Error codes: DK4_E_OVERFLOW. */ long long dk4ma_ll_abs(long long 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. */ long long dk4ma_ll_add(long long a, long long 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. */ long long dk4ma_ll_sub(long long a, long long 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. */ long long dk4ma_ll_mul(long long a, long long 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, LLONG_MIN, LLONG_MAX, or 0 on division by zero or overflow (see the ec component of erp). Error codes: DK4_E_OVERFLOW, DK4_E_DIVZERO. */ long long dk4ma_ll_div(long long a, long long b, dk4_er_t *erp); #endif #ifdef __cplusplus } #endif %% module #include "dk4conf.h" #include "dk4types.h" #include "dk4error.h" #include "dk4numco.h" #include "dk4maall.h" #if DK4_HAVE_LONG_LONG long long dk4ma_ll_abs(long long a, dk4_er_t *erp) { if (LLONG_MIN == a) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } return ((0LL <= a) ? a : ((LLONG_MIN == a) ? LLONG_MAX : (0LL - a))); } long long dk4ma_ll_add(long long a, long long b, dk4_er_t *erp) { if ((0LL < a) && (0LL < b)) { if ((LLONG_MAX - a) < b) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } else { if ((0LL > a) && (0LL > b)) { if (LLONG_MIN == a) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } else { if ((LLONG_MIN - a) > b) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } } } return (a + b); } long long dk4ma_ll_sub(long long a, long long b, dk4_er_t *erp) { if ((0LL < a) && (0LL > b)) { if ((LLONG_MAX + b) < a) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } else { if ((0LL > a) && (0LL < b)) { if ((LLONG_MIN + b) > a) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } } return (a - b); } long long dk4ma_ll_mul(long long a, long long b, dk4_er_t *erp) { if ((0LL != a) && (0LL != b)) { if (LLONG_MIN == a) { if (1LL != b) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } else { if (LLONG_MIN == b) { if (1LL != a) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } else { if (0LL < a) { if (0LL < b) { if ((LLONG_MAX / a) < b) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } else { if ((LLONG_MIN / a) > b) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } } else { if (0LL < b) { if ((LLONG_MIN / b) > a) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } else { if ((LLONG_MAX / (0LL - a)) < (0LL - b)) { dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } } } } } } return (a * b); } long long dk4ma_ll_div(long long a, long long b, dk4_er_t *erp) { long long back = 0; if (0LL != b) { if ((LLONG_MIN == a) && (-1LL == b)) { back = LLONG_MAX; dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW); } else { back = a / b; } } else { if (0LL < a) { back = LLONG_MAX; } else { if (0LL > a) { back = LLONG_MIN; } } dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO); } return back; } #endif