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31 | #include <sort.h> |
31 | #include <sort.h> |
32 | #include <panic.h> |
32 | #include <panic.h> |
33 | 33 | ||
34 | #define EBUFSIZE 32 |
34 | #define EBUFSIZE 32 |
35 | 35 | ||
36 | static void _qsort(void * data, count_t n, size_t e_size, int (* cmp) (void * a, void * b), void * pivot, void * tmp); |
36 | void qsort(void * data, count_t n, size_t e_size, int (* cmp) (void * a, void * b)) |
37 | 37 | { |
|
38 | /* |
- | |
39 | * Wrapper method for quicksort algorithm to decrease amount of allocations |
- | |
40 | */ |
- | |
41 | void qsort(void * data, count_t n, size_t e_size, int (* cmp) (void * a, void * b)) { |
- | |
42 | __u8 buf_tmp[EBUFSIZE]; |
38 | __u8 buf_tmp[EBUFSIZE]; |
43 | __u8 buf_pivot[EBUFSIZE]; |
39 | __u8 buf_pivot[EBUFSIZE]; |
44 | void * tmp = buf_tmp; |
40 | void * tmp = buf_tmp; |
45 | void * pivot = buf_pivot; |
41 | void * pivot = buf_pivot; |
46 | 42 | ||
Line 51... | Line 47... | ||
51 | if (!tmp || !pivot) { |
47 | if (!tmp || !pivot) { |
52 | panic("Cannot allocate memory\n"); |
48 | panic("Cannot allocate memory\n"); |
53 | } |
49 | } |
54 | } |
50 | } |
55 | 51 | ||
- | 52 | if (n > 4) { |
|
- | 53 | int i = 0, j = n - 1; |
|
- | 54 | ||
- | 55 | memcpy(pivot, data, e_size); |
|
- | 56 | ||
- | 57 | while (1) { |
|
- | 58 | while ((cmp(data + i * e_size, pivot) < 0) && i < n) i++; |
|
- | 59 | while ((cmp(data + j * e_size, pivot) >=0) && j > 0) j--; |
|
- | 60 | if (i<j) { |
|
- | 61 | memcpy(tmp, data + i * e_size, e_size); |
|
- | 62 | memcpy(data + i * e_size, data + j * e_size, e_size); |
|
- | 63 | memcpy(data + j * e_size, tmp, e_size); |
|
- | 64 | } else { |
|
- | 65 | break; |
|
- | 66 | } |
|
- | 67 | } |
|
- | 68 | ||
56 | _qsort(data, n, e_size, cmp, pivot, tmp); |
69 | qsort(data, j + 1, e_size, cmp); |
- | 70 | qsort(data + (j + 1) * e_size, n - j - 1, e_size, cmp); |
|
- | 71 | } else { |
|
- | 72 | bubblesort(data, n, e_size, cmp); |
|
- | 73 | } |
|
- | 74 | ||
57 | 75 | ||
58 | if (e_size > EBUFSIZE) { |
76 | if (e_size > EBUFSIZE) { |
59 | free(tmp); |
77 | free(tmp); |
60 | free(pivot); |
78 | free(pivot); |
61 | } |
79 | } |
62 | } |
80 | } |
63 | 81 | ||
64 | 82 | ||
65 | void bubblesort(void * data, count_t n, size_t e_size, int (* cmp) (void * a, void * b)) { |
83 | void bubblesort(void * data, count_t n, size_t e_size, int (* cmp) (void * a, void * b)) |
- | 84 | { |
|
66 | __u8 buf_slot[EBUFSIZE]; |
85 | __u8 buf_slot[EBUFSIZE]; |
67 | bool done = false; |
86 | bool done = false; |
68 | void * p; |
87 | void * p; |
69 | void * slot = buf_slot; |
88 | void * slot = buf_slot; |
70 | 89 | ||
Line 91... | Line 110... | ||
91 | if (e_size > EBUFSIZE) { |
110 | if (e_size > EBUFSIZE) { |
92 | free(slot); |
111 | free(slot); |
93 | } |
112 | } |
94 | } |
113 | } |
95 | 114 | ||
96 | static void _qsort(void * data, count_t n, size_t e_size, int (* cmp) (void * a, void * b), void * pivot, void * tmp) { |
- | |
97 | if (n > 4) { |
- | |
98 | int i = 0, j = n - 1; |
- | |
99 | - | ||
100 | memcpy(pivot, data, e_size); |
- | |
101 | - | ||
102 | while (1) { |
- | |
103 | while ((cmp(data + i * e_size, pivot) < 0) && i < n) i++; |
- | |
104 | while ((cmp(data + j * e_size, pivot) >=0) && j > 0) j--; |
- | |
105 | if (i<j) { |
- | |
106 | memcpy(tmp, data + i * e_size, e_size); |
- | |
107 | memcpy(data + i * e_size, data + j * e_size, e_size); |
- | |
108 | memcpy(data + j * e_size, tmp, e_size); |
- | |
109 | } else { |
- | |
110 | break; |
- | |
111 | } |
- | |
112 | } |
- | |
113 | - | ||
114 | qsort(data, j + 1, e_size, cmp); |
- | |
115 | qsort(data + (j + 1) * e_size, n - j - 1, e_size, cmp); |
- | |
116 | } else { |
- | |
117 | bubblesort(data, n, e_size, cmp); |
- | |
118 | } |
- | |
119 | } |
- | |
120 | - | ||
121 | - | ||
122 | - | ||
123 | /* |
115 | /* |
124 | * Comparator returns 1 if a > b, 0 if a == b, -1 if a < b |
116 | * Comparator returns 1 if a > b, 0 if a == b, -1 if a < b |
125 | */ |
117 | */ |
126 | int int_cmp(void * a, void * b) { |
118 | int int_cmp(void * a, void * b) |
- | 119 | { |
|
127 | return (* (int *) a > * (int*)b) ? 1 : (*(int *)a < * (int *)b) ? -1 : 0; |
120 | return (* (int *) a > * (int*)b) ? 1 : (*(int *)a < * (int *)b) ? -1 : 0; |
128 | } |
121 | } |
129 | 122 | ||
130 | int __u8_cmp(void * a, void * b) { |
123 | int __u8_cmp(void * a, void * b) |
- | 124 | { |
|
131 | return (* (__u8 *) a > * (__u8 *)b) ? 1 : (*(__u8 *)a < * (__u8 *)b) ? -1 : 0; |
125 | return (* (__u8 *) a > * (__u8 *)b) ? 1 : (*(__u8 *)a < * (__u8 *)b) ? -1 : 0; |
132 | } |
126 | } |
133 | 127 | ||
134 | int __u16_cmp(void * a, void * b) { |
128 | int __u16_cmp(void * a, void * b) |
- | 129 | { |
|
135 | return (* (__u16 *) a > * (__u16 *)b) ? 1 : (*(__u16 *)a < * (__u16 *)b) ? -1 : 0; |
130 | return (* (__u16 *) a > * (__u16 *)b) ? 1 : (*(__u16 *)a < * (__u16 *)b) ? -1 : 0; |
136 | } |
131 | } |
137 | 132 | ||
138 | int __u32_cmp(void * a, void * b) { |
133 | int __u32_cmp(void * a, void * b) |
- | 134 | { |
|
139 | return (* (__u32 *) a > * (__u32 *)b) ? 1 : (*(__u32 *)a < * (__u32 *)b) ? -1 : 0; |
135 | return (* (__u32 *) a > * (__u32 *)b) ? 1 : (*(__u32 *)a < * (__u32 *)b) ? -1 : 0; |
140 | } |
136 | } |
141 | - |