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+%% options
+
+copyright owner = Dirk Krause
+copyright year = 2015-xxxx
+license = bsd
+
+
+
+%% header
+
+/** @file
+ Arithmetic operations on dk4_um_t.
+
+ 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.
+*/
+dk4_um_t
+dk4ma_um_add(dk4_um_t a, dk4_um_t 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.
+*/
+dk4_um_t
+dk4ma_um_sub(dk4_um_t a, dk4_um_t 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.
+*/
+dk4_um_t
+dk4ma_um_mul(dk4_um_t a, dk4_um_t 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,
+ DK4_UM_MAX on division by zero
+ (see the ec component of erp).
+
+ Error codes: DK4_E_DIVZERO.
+*/
+dk4_um_t
+dk4ma_um_div(dk4_um_t a, dk4_um_t b, dk4_er_t *erp);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+%% module
+
+#include "dk4conf.h"
+#include "dk4types.h"
+#include "dk4error.h"
+#include "dk4numco.h"
+
+#if DK4_HAVE_INTMAX_T
+#include "dk4maamu.h"
+#else
+#if DK4_HAVE_LONG_LONG
+#include "dk4maalu.h"
+#else
+#include "dk4maaul.h"
+#endif
+#endif
+
+#include "dk4maadu.h"
+
+
+dk4_um_t
+dk4ma_um_add(dk4_um_t a, dk4_um_t b, dk4_er_t *erp)
+{
+#if DK4_HAVE_INTMAX_T
+ return (dk4ma_uintmax_t_add(a, b, erp));
+#else
+#if DK4_HAVE_LONG_LONG
+ return (dk4ma_ull_add(a, b, erp));
+#else
+ return (dk4ma_ulong_add(a, b, erp));
+#endif
+#endif
+}
+
+
+
+dk4_um_t
+dk4ma_um_sub(dk4_um_t a, dk4_um_t b, dk4_er_t *erp)
+{
+#if DK4_HAVE_INTMAX_T
+ return (dk4ma_uintmax_t_sub(a, b, erp));
+#else
+#if DK4_HAVE_LONG_LONG
+ return (dk4ma_ull_sub(a, b, erp));
+#else
+ return (dk4ma_ulong_sub(a, b, erp));
+#endif
+#endif
+}
+
+
+
+dk4_um_t
+dk4ma_um_mul(dk4_um_t a, dk4_um_t b, dk4_er_t *erp)
+{
+#if DK4_HAVE_INTMAX_T
+ return (dk4ma_uintmax_t_mul(a, b, erp));
+#else
+#if DK4_HAVE_LONG_LONG
+ return (dk4ma_ull_mul(a, b, erp));
+#else
+ return (dk4ma_ulong_mul(a, b, erp));
+#endif
+#endif
+}
+
+
+
+dk4_um_t
+dk4ma_um_div(dk4_um_t a, dk4_um_t b, dk4_er_t *erp)
+{
+#if DK4_HAVE_INTMAX_T
+ return (dk4ma_uintmax_t_div(a, b,erp));
+#else
+#if DK4_HAVE_LONG_LONG
+ return (dk4ma_ull_div(a, b, erp));
+#else
+ return (dk4ma_ulong_div(a, b, erp));
+#endif
+#endif
+}
+