summaryrefslogtreecommitdiff
path: root/support/dktools/dk3maus.ctr
blob: cfbb8cff15b91a77ed1ba4523b9b433e155f8cd9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
%%	options

copyright owner	=	Dirk Krause
copyright year	=	2014-xxxx
license		=	bsd



%%	header

/**	@file	dk3maus.h	Mathematical operations on unsigned short.
*/

#include <dk3conf.h>

#include <stdio.h>
#if DK3_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if DK3_HAVE_STDINT
#include <stdint.h>
#endif
#if DK3_HAVE_INTTYPES_H
#include <inttypes.h>
#endif
#if DK3_HAVE_LIMITS_H
#include <limits.h>
#endif
#if DK3_HAVE_MATH_H
#include <math.h>
#endif
#if DK3_HAVE_FLOAT_H
#include <float.h>
#endif


#ifdef __cplusplus
extern "C" {
#endif

/**	Addition.
	@param	a	Left operand.
	@param	b	Right operand.
	@param	ec	Pointer to error code variable, may be NULL.
	The variable may be set to DK3_ERROR_MATH_OVERFLOW when returning.
	@return	Summary of a and b.
*/
unsigned short
dk3ma_us_add_ok(unsigned short a, unsigned short b, int *ec);

/**	Substraction.
	@param	a	Left operand.
	@param	b	Right operand.
	@param	ec	Pointer to error code variable, may be NULL.
	The variable may be set to DK3_ERROR_MATH_OVERFLOW when returning.
	@return	Difference of a and b.
*/
unsigned short
dk3ma_us_sub_ok(unsigned short a, unsigned short b, int *ec);

/**	Multiplication.
	@param	a	Left operand.
	@param	b	Right operand.
	@param	ec	Pointer to error code variable, may be NULL.
	The variable may be set to DK3_ERROR_MATH_OVERFLOW when returning.
	@return	Product of a and b.
*/
unsigned short
dk3ma_us_mul_ok(unsigned short a, unsigned short b, int *ec);

/**	Division.
	@param	a	Left operand (nominator).
	@param	b	Right operand (denominator).
	@param	ec	Pointer to error code variable, may be NULL.
	The variable may be set to DK3_ERROR_MATH_OVERFLOW or
	DK3_ERROR_MATH_DIVZERO when returning.
	@return	Fraction of a and b.
*/
unsigned short
dk3ma_us_div_ok(unsigned short a, unsigned short b, int *ec);

/**	Greatest common divisor.
	@param	a	Left operand.
	@param	b	Right operand.
	The variable may be set to DK3_ERROR_MATH_OVERFLOW when returning.
	@return	Greatest common divisor of a and b.
*/
unsigned short
dk3ma_us_gcd(unsigned short a, unsigned short b);

#ifdef __cplusplus
}
#endif



%%	module



#include "dk3ma.h"



$!trace-include



unsigned short
dk3ma_us_add_ok(unsigned short a, unsigned short b, int *ec)
{
  if (NULL != ec) {
    if ((DK3_US_MAX - a) < b) { *ec = DK3_ERROR_MATH_OVERFLOW; }
  }
  return (a + b);
}



unsigned short
dk3ma_us_sub_ok(unsigned short a, unsigned short b, int *ec)
{
  if (NULL != ec) { if (b > a) { *ec = DK3_ERROR_MATH_OVERFLOW; } }
  return (a - b);
}



unsigned short
dk3ma_us_mul_ok(unsigned short a, unsigned short b, int *ec)
{
  if (NULL != ec) {
    if (0 != a) {
      if ((DK3_US_MAX / a) < b) { *ec = DK3_ERROR_MATH_OVERFLOW; }
    }
  }
  return (a * b);
}



unsigned short
dk3ma_us_div_ok(unsigned short a, unsigned short b, int *ec)
{
  unsigned short	back	=	(unsigned short)0;
  if (0 != b) {
    back = a / b;
  } else {
    if (NULL != ec) { *ec = DK3_ERROR_MATH_DIVZERO; }
    back = DK3_US_MAX;
  }
  return back;
}



unsigned short
dk3ma_us_gcd(unsigned short a, unsigned short b)
{
  unsigned short	h;
  while (0 < b) {
    h = a % b;
    a = b;
    b = h;
  }
  if (0 == a) { a = (unsigned short)1; }
  return a;
}