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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /support/dktools/dk4maaul.ctr
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+%% options
+
+copyright owner = Dirk Krause
+copyright year = 2015-xxxx
+license = bsd
+
+
+
+%% header
+
+/** @file
+ Arithmetic operations on unsigned 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
+
+/** 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.
+*/
+unsigned long
+dk4ma_ulong_add(unsigned long a, unsigned 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.
+*/
+unsigned long
+dk4ma_ulong_sub(unsigned long a, unsigned 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.
+*/
+unsigned long
+dk4ma_ulong_mul(unsigned long a, unsigned 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,
+ ULONG_MAX on division by zero
+ (see the ec component of erp).
+
+ Error codes: DK4_E_DIVZERO.
+*/
+unsigned long
+dk4ma_ulong_div(unsigned long a, unsigned long b, dk4_er_t *erp);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+%% module
+
+#include "dk4conf.h"
+#include "dk4types.h"
+#include "dk4error.h"
+#include "dk4numco.h"
+#include "dk4maaul.h"
+
+
+
+$!trace-include
+
+
+
+unsigned long
+dk4ma_ulong_add(unsigned long a, unsigned long b, dk4_er_t *erp)
+{
+ $? "+ dk4ma_ulong_add %lu %lu", a, b
+ $? ". ULONG_MAX = %lu", ULONG_MAX
+ $? ". ULONG_MAX - a = %lu", (ULONG_MAX - a)
+ $? ". b = %lu", b
+ if ((ULONG_MAX - a) < b) { $? "! overflow"
+ dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
+ }
+ $? "- dk4ma_ulong_add %lu", (a+b)
+ return (unsigned long)(a + b);
+}
+
+
+
+unsigned long
+dk4ma_ulong_sub(unsigned long a, unsigned long b, dk4_er_t *erp)
+{
+ if (b > a) {
+ dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
+ }
+ return (unsigned long)(a - b);
+}
+
+
+
+unsigned long
+dk4ma_ulong_mul(unsigned long a, unsigned long b, dk4_er_t *erp)
+{
+ if (0UL < a) {
+ if ((ULONG_MAX / a) < b) {
+ dk4error_set_simple_error_code(erp, DK4_E_MATH_OVERFLOW);
+ }
+ }
+ return (unsigned long)(a * b);
+}
+
+
+
+unsigned long
+dk4ma_ulong_div(unsigned long a, unsigned long b, dk4_er_t *erp)
+{
+ if (0UL < b) {
+ return (unsigned long)(a / b);
+ } else {
+ dk4error_set_simple_error_code(erp, DK4_E_MATH_DIVZERO);
+ return (unsigned long)(ULONG_MAX);
+ }
+}
+