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| Rev | Author | Line No. | Line |
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| 333 | bondari | 1 | /* |
| 2 | * Copyright (C) 2005 Sergey Bondari |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 331 | bondari | 29 | #include <mm/heap.h> |
| 30 | #include <memstr.h> |
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| 31 | #include <sort.h> |
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| 335 | bondari | 32 | #include <panic.h> |
| 331 | bondari | 33 | |
| 349 | jermar | 34 | #define EBUFSIZE 32 |
| 35 | |||
| 350 | jermar | 36 | void qsort(void * data, count_t n, size_t e_size, int (* cmp) (void * a, void * b)) |
| 37 | { |
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| 349 | jermar | 38 | __u8 buf_tmp[EBUFSIZE]; |
| 39 | __u8 buf_pivot[EBUFSIZE]; |
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| 40 | void * tmp = buf_tmp; |
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| 41 | void * pivot = buf_pivot; |
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| 42 | |||
| 43 | if (e_size > EBUFSIZE) { |
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| 44 | pivot = (void *) malloc(e_size); |
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| 45 | tmp = (void *) malloc(e_size); |
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| 335 | bondari | 46 | |
| 349 | jermar | 47 | if (!tmp || !pivot) { |
| 48 | panic("Cannot allocate memory\n"); |
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| 49 | } |
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| 335 | bondari | 50 | } |
| 51 | |||
| 350 | jermar | 52 | if (n > 4) { |
| 53 | int i = 0, j = n - 1; |
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| 54 | |||
| 55 | memcpy(pivot, data, e_size); |
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| 56 | |||
| 57 | while (1) { |
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| 58 | while ((cmp(data + i * e_size, pivot) < 0) && i < n) i++; |
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| 59 | while ((cmp(data + j * e_size, pivot) >=0) && j > 0) j--; |
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| 60 | if (i<j) { |
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| 61 | memcpy(tmp, data + i * e_size, e_size); |
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| 62 | memcpy(data + i * e_size, data + j * e_size, e_size); |
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| 63 | memcpy(data + j * e_size, tmp, e_size); |
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| 64 | } else { |
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| 65 | break; |
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| 66 | } |
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| 67 | } |
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| 68 | |||
| 69 | qsort(data, j + 1, e_size, cmp); |
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| 70 | qsort(data + (j + 1) * e_size, n - j - 1, e_size, cmp); |
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| 71 | } else { |
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| 72 | bubblesort(data, n, e_size, cmp); |
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| 73 | } |
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| 74 | |||
| 335 | bondari | 75 | |
| 349 | jermar | 76 | if (e_size > EBUFSIZE) { |
| 77 | free(tmp); |
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| 78 | free(pivot); |
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| 79 | } |
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| 335 | bondari | 80 | } |
| 81 | |||
| 82 | |||
| 350 | jermar | 83 | void bubblesort(void * data, count_t n, size_t e_size, int (* cmp) (void * a, void * b)) |
| 84 | { |
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| 349 | jermar | 85 | __u8 buf_slot[EBUFSIZE]; |
| 335 | bondari | 86 | bool done = false; |
| 87 | void * p; |
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| 349 | jermar | 88 | void * slot = buf_slot; |
| 89 | |||
| 90 | if (e_size > EBUFSIZE) { |
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| 91 | slot = (void *) malloc(e_size); |
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| 92 | |||
| 93 | if (!slot) { |
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| 94 | panic("Cannot allocate memory\n"); |
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| 95 | } |
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| 96 | } |
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| 335 | bondari | 97 | |
| 98 | while (!done) { |
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| 99 | done = true; |
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| 100 | for (p = data; p < data + e_size * (n - 1); p = p + e_size) { |
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| 101 | if (cmp(p, p + e_size) == 1) { |
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| 102 | memcpy(slot, p, e_size); |
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| 103 | memcpy(p, p + e_size, e_size); |
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| 104 | memcpy(p + e_size, slot, e_size); |
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| 105 | done = false; |
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| 106 | } |
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| 107 | } |
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| 108 | } |
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| 109 | |||
| 349 | jermar | 110 | if (e_size > EBUFSIZE) { |
| 111 | free(slot); |
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| 112 | } |
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| 335 | bondari | 113 | } |
| 114 | |||
| 331 | bondari | 115 | /* |
| 116 | * Comparator returns 1 if a > b, 0 if a == b, -1 if a < b |
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| 117 | */ |
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| 350 | jermar | 118 | int int_cmp(void * a, void * b) |
| 119 | { |
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| 333 | bondari | 120 | return (* (int *) a > * (int*)b) ? 1 : (*(int *)a < * (int *)b) ? -1 : 0; |
| 331 | bondari | 121 | } |
| 122 | |||
| 350 | jermar | 123 | int __u8_cmp(void * a, void * b) |
| 124 | { |
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| 333 | bondari | 125 | return (* (__u8 *) a > * (__u8 *)b) ? 1 : (*(__u8 *)a < * (__u8 *)b) ? -1 : 0; |
| 331 | bondari | 126 | } |
| 127 | |||
| 350 | jermar | 128 | int __u16_cmp(void * a, void * b) |
| 129 | { |
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| 333 | bondari | 130 | return (* (__u16 *) a > * (__u16 *)b) ? 1 : (*(__u16 *)a < * (__u16 *)b) ? -1 : 0; |
| 331 | bondari | 131 | } |
| 132 | |||
| 350 | jermar | 133 | int __u32_cmp(void * a, void * b) |
| 134 | { |
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| 333 | bondari | 135 | return (* (__u32 *) a > * (__u32 *)b) ? 1 : (*(__u32 *)a < * (__u32 *)b) ? -1 : 0; |
| 331 | bondari | 136 | } |