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Commit | Line | Data |
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1c1af145 | 1 | /* |
2 | * Handling of the int64 and uint64 types. Done in 32-bit integers, | |
3 | * for (pre-C99) portability. Hopefully once C99 becomes widespread | |
4 | * we can kiss this lot goodbye... | |
5 | */ | |
6 | ||
7 | #include <assert.h> | |
8 | #include <string.h> | |
9 | ||
10 | #include "int64.h" | |
11 | ||
12 | uint64 uint64_div10(uint64 x, int *remainder) | |
13 | { | |
14 | uint64 y; | |
15 | unsigned int rem, r2; | |
16 | y.hi = x.hi / 10; | |
17 | y.lo = x.lo / 10; | |
18 | rem = x.lo % 10; | |
19 | /* | |
20 | * Now we have to add in the remainder left over from x.hi. | |
21 | */ | |
22 | r2 = x.hi % 10; | |
23 | y.lo += r2 * 429496729; | |
24 | rem += r2 * 6; | |
25 | y.lo += rem / 10; | |
26 | rem %= 10; | |
27 | ||
28 | if (remainder) | |
29 | *remainder = rem; | |
30 | return y; | |
31 | } | |
32 | ||
33 | void uint64_decimal(uint64 x, char *buffer) | |
34 | { | |
35 | char buf[20]; | |
36 | int start = 20; | |
37 | int d; | |
38 | ||
39 | do { | |
40 | x = uint64_div10(x, &d); | |
41 | assert(start > 0); | |
42 | buf[--start] = d + '0'; | |
43 | } while (x.hi || x.lo); | |
44 | ||
45 | memcpy(buffer, buf + start, sizeof(buf) - start); | |
46 | buffer[sizeof(buf) - start] = '\0'; | |
47 | } | |
48 | ||
49 | uint64 uint64_make(unsigned long hi, unsigned long lo) | |
50 | { | |
51 | uint64 y; | |
52 | y.hi = hi & 0xFFFFFFFFU; | |
53 | y.lo = lo & 0xFFFFFFFFU; | |
54 | return y; | |
55 | } | |
56 | ||
57 | uint64 uint64_add(uint64 x, uint64 y) | |
58 | { | |
59 | x.lo = (x.lo + y.lo) & 0xFFFFFFFFU; | |
60 | x.hi += y.hi + (x.lo < y.lo ? 1 : 0); | |
61 | return x; | |
62 | } | |
63 | ||
64 | uint64 uint64_add32(uint64 x, unsigned long y) | |
65 | { | |
66 | uint64 yy; | |
67 | yy.hi = 0; | |
68 | yy.lo = y; | |
69 | return uint64_add(x, yy); | |
70 | } | |
71 | ||
72 | int uint64_compare(uint64 x, uint64 y) | |
73 | { | |
74 | if (x.hi != y.hi) | |
75 | return x.hi < y.hi ? -1 : +1; | |
76 | if (x.lo != y.lo) | |
77 | return x.lo < y.lo ? -1 : +1; | |
78 | return 0; | |
79 | } | |
80 | ||
81 | uint64 uint64_subtract(uint64 x, uint64 y) | |
82 | { | |
83 | x.lo = (x.lo - y.lo) & 0xFFFFFFFFU; | |
84 | x.hi = (x.hi - y.hi - (x.lo > (y.lo ^ 0xFFFFFFFFU) ? 1 : 0)) & 0xFFFFFFFFU; | |
85 | return x; | |
86 | } | |
87 | ||
88 | double uint64_to_double(uint64 x) | |
89 | { | |
90 | return (4294967296.0 * x.hi) + (double)x.lo; | |
91 | } | |
92 | ||
93 | uint64 uint64_shift_right(uint64 x, int shift) | |
94 | { | |
95 | if (shift < 32) { | |
96 | x.lo >>= shift; | |
97 | x.lo |= (x.hi << (32-shift)) & 0xFFFFFFFFU; | |
98 | x.hi >>= shift; | |
99 | } else { | |
100 | x.lo = x.hi >> (shift-32); | |
101 | x.hi = 0; | |
102 | } | |
103 | return x; | |
104 | } | |
105 | ||
106 | uint64 uint64_shift_left(uint64 x, int shift) | |
107 | { | |
108 | if (shift < 32) { | |
109 | x.hi = (x.hi << shift) & 0xFFFFFFFFU; | |
110 | x.hi |= (x.lo >> (32-shift)); | |
111 | x.lo = (x.lo << shift) & 0xFFFFFFFFU; | |
112 | } else { | |
113 | x.hi = (x.lo << (shift-32)) & 0xFFFFFFFFU; | |
114 | x.lo = 0; | |
115 | } | |
116 | return x; | |
117 | } | |
118 | ||
119 | uint64 uint64_from_decimal(char *str) | |
120 | { | |
121 | uint64 ret; | |
122 | ret.hi = ret.lo = 0; | |
123 | while (*str >= '0' && *str <= '9') { | |
124 | ret = uint64_add(uint64_shift_left(ret, 3), | |
125 | uint64_shift_left(ret, 1)); | |
126 | ret = uint64_add32(ret, *str - '0'); | |
127 | str++; | |
128 | } | |
129 | return ret; | |
130 | } | |
131 | ||
132 | #ifdef TESTMODE | |
133 | ||
134 | #include <stdio.h> | |
135 | ||
136 | int main(void) | |
137 | { | |
138 | uint64 x, y, z; | |
139 | char buf[80]; | |
140 | ||
141 | x = uint64_make(0x3456789AUL, 0xDEF01234UL); | |
142 | printf("%08lx.%08lx\n", x.hi, x.lo); | |
143 | uint64_decimal(x, buf); | |
144 | printf("%s\n", buf); | |
145 | ||
146 | y = uint64_add32(x, 0xFFFFFFFFU); | |
147 | printf("%08lx.%08lx\n", y.hi, y.lo); | |
148 | uint64_decimal(y, buf); | |
149 | printf("%s\n", buf); | |
150 | ||
151 | z = uint64_subtract(y, x); | |
152 | printf("%08lx.%08lx\n", z.hi, z.lo); | |
153 | uint64_decimal(z, buf); | |
154 | printf("%s\n", buf); | |
155 | ||
156 | z = uint64_subtract(x, y); | |
157 | printf("%08lx.%08lx\n", z.hi, z.lo); | |
158 | uint64_decimal(z, buf); | |
159 | printf("%s\n", buf); | |
160 | ||
161 | y = uint64_shift_right(x, 4); | |
162 | printf("%08lx.%08lx\n", y.hi, y.lo); | |
163 | ||
164 | y = uint64_shift_right(x, 36); | |
165 | printf("%08lx.%08lx\n", y.hi, y.lo); | |
166 | ||
167 | y = uint64_shift_left(x, 4); | |
168 | printf("%08lx.%08lx\n", x.hi, x.lo); | |
169 | ||
170 | y = uint64_shift_left(x, 36); | |
171 | printf("%08lx.%08lx\n", x.hi, x.lo); | |
172 | ||
173 | return 0; | |
174 | } | |
175 | #endif |