Subversion Repositories HelenOS

Rev

Rev 2787 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
333 bondari 1 
/*
2071 jermar 2 
 * Copyright (c) 2005 Sergey Bondari
333 bondari 3 
 * All rights reserved.
4 
 *
5 
 * Redistribution and use in source and binary forms, with or without
6 
 * modification, are permitted provided that the following conditions
7 
 * are met:
8 
 *
9 
 * - Redistributions of source code must retain the above copyright
10 
 *   notice, this list of conditions and the following disclaimer.
11 
 * - Redistributions in binary form must reproduce the above copyright
12 
 *   notice, this list of conditions and the following disclaimer in the
13 
 *   documentation and/or other materials provided with the distribution.
14 
 * - The name of the author may not be used to endorse or promote products
15 
 *   derived from this software without specific prior written permission.
16 
 *
17 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
 */
28 
 
1757 jermar 29 
/** @addtogroup generic
1702 cejka 30 
 * @{
31 
 */
32 
 
1264 jermar 33 
/**
1702 cejka 34 
 * @file
1264 jermar 35 
 * @brief   Sorting functions.
36 
 *
37 
 * This files contains functions implementing several sorting
38 
 * algorithms (e.g. quick sort and bubble sort).
39 
 */
40 
 
814 palkovsky 41 
#include <mm/slab.h>
331 bondari 42 
#include <memstr.h>
43 
#include <sort.h>
335 bondari 44 
#include <panic.h>
331 bondari 45 
 
349 jermar 46 
#define EBUFSIZE    32
47 
 
4692 svoboda 48 
void _qsort(void * data, size_t n, size_t e_size, int (* cmp) (void * a, void * b), void *tmp, void *pivot);
49 
void _bubblesort(void * data, size_t n, size_t e_size, int (* cmp) (void * a, void * b), void *slot);
351 jermar 50 
 
51 
/** Quicksort wrapper
52 
 *
53 
 * This is only a wrapper that takes care of memory allocations for storing
54 
 * the pivot and temporary elements for generic quicksort algorithm.
55 
 *
822 palkovsky 56 
 * This function _can_ sleep
57 
 *
351 jermar 58 
 * @param data Pointer to data to be sorted.
59 
 * @param n Number of elements to be sorted.
60 
 * @param e_size Size of one element.
61 
 * @param cmp Comparator function.
62 
 *
63 
 */
4692 svoboda 64 
void qsort(void * data, size_t n, size_t e_size, int (* cmp) (void * a, void * b))
350 jermar 65 
{
1780 jermar 66 
    uint8_t buf_tmp[EBUFSIZE];
67 
    uint8_t buf_pivot[EBUFSIZE];
349 jermar 68 
    void * tmp = buf_tmp;
69 
    void * pivot = buf_pivot;
70 
 
71 
    if (e_size > EBUFSIZE) {
822 palkovsky 72 
        pivot = (void *) malloc(e_size, 0);
73 
        tmp = (void *) malloc(e_size, 0);
335 bondari 74 
    }
75 
 
351 jermar 76 
    _qsort(data, n, e_size, cmp, tmp, pivot);
77 
 
78 
    if (e_size > EBUFSIZE) {
79 
        free(tmp);
80 
        free(pivot);
81 
    }
82 
}
83 
 
84 
/** Quicksort
85 
 *
86 
 * Apply generic quicksort algorithm on supplied data, using pre-allocated buffers.
87 
 *
88 
 * @param data Pointer to data to be sorted.
89 
 * @param n Number of elements to be sorted.
90 
 * @param e_size Size of one element.
91 
 * @param cmp Comparator function.
92 
 * @param tmp Pointer to scratch memory buffer e_size bytes long.
93 
 * @param pivot Pointer to scratch memory buffer e_size bytes long.
94 
 *
95 
 */
4692 svoboda 96 
void _qsort(void * data, size_t n, size_t e_size, int (* cmp) (void * a, void * b), void *tmp, void *pivot)
351 jermar 97 
{
350 jermar 98 
    if (n > 4) {
2745 decky 99 
        unsigned int i = 0, j = n - 1;
350 jermar 100 
 
101 
        memcpy(pivot, data, e_size);
102 
 
103 
        while (1) {
2745 decky 104 
            while ((cmp(data + i * e_size, pivot) < 0) && (i < n))
105 
                i++;
106 
            while ((cmp(data + j * e_size, pivot) >= 0) && (j > 0))
107 
                j--;
108 
 
109 
            if (i < j) {
350 jermar 110 
                memcpy(tmp, data + i * e_size, e_size);
111 
                memcpy(data + i * e_size, data + j * e_size, e_size);
112 
                memcpy(data + j * e_size, tmp, e_size);
113 
            } else {
114 
                break;
115 
            }
116 
        }
117 
 
351 jermar 118 
        _qsort(data, j + 1, e_size, cmp, tmp, pivot);
119 
        _qsort(data + (j + 1) * e_size, n - j - 1, e_size, cmp, tmp, pivot);
350 jermar 120 
    } else {
351 jermar 121 
        _bubblesort(data, n, e_size, cmp, tmp);
350 jermar 122 
    }
335 bondari 123 
}
124 
 
351 jermar 125 
/** Bubblesort wrapper
126 
 *
127 
 * This is only a wrapper that takes care of memory allocation for storing
128 
 * the slot element for generic bubblesort algorithm.
129 
 *
130 
 * @param data Pointer to data to be sorted.
131 
 * @param n Number of elements to be sorted.
132 
 * @param e_size Size of one element.
133 
 * @param cmp Comparator function.
134 
 *
135 
 */
4692 svoboda 136 
void bubblesort(void * data, size_t n, size_t e_size, int (* cmp) (void * a, void * b))
350 jermar 137 
{
1780 jermar 138 
    uint8_t buf_slot[EBUFSIZE];
349 jermar 139 
    void * slot = buf_slot;
140 
 
141 
    if (e_size > EBUFSIZE) {
822 palkovsky 142 
        slot = (void *) malloc(e_size, 0);
349 jermar 143 
    }
335 bondari 144 
 
351 jermar 145 
    _bubblesort(data, n, e_size, cmp, slot);
146 
 
147 
    if (e_size > EBUFSIZE) {
148 
        free(slot);
149 
    }
150 
}
151 
 
152 
/** Bubblesort
153 
 *
154 
 * Apply generic bubblesort algorithm on supplied data, using pre-allocated buffer.
155 
 *
156 
 * @param data Pointer to data to be sorted.
157 
 * @param n Number of elements to be sorted.
158 
 * @param e_size Size of one element.
159 
 * @param cmp Comparator function.
160 
 * @param slot Pointer to scratch memory buffer e_size bytes long.
161 
 *
162 
 */
4692 svoboda 163 
void _bubblesort(void * data, size_t n, size_t e_size, int (* cmp) (void * a, void * b), void *slot)
351 jermar 164 
{
165 
    bool done = false;
166 
    void * p;
167 
 
335 bondari 168 
    while (!done) {
169 
        done = true;
170 
        for (p = data; p < data + e_size * (n - 1); p = p + e_size) {
171 
            if (cmp(p, p + e_size) == 1) {
172 
                memcpy(slot, p, e_size);
173 
                memcpy(p, p + e_size, e_size);
174 
                memcpy(p + e_size, slot, e_size);
175 
                done = false;
176 
            }
177 
        }
178 
    }
351 jermar 179 
 
335 bondari 180 
}
181 
 
331 bondari 182 
/*
183 
 * Comparator returns 1 if a > b, 0 if a == b, -1 if a < b
184 
 */
350 jermar 185 
int int_cmp(void * a, void * b)
186 
{
333 bondari 187 
    return (* (int *) a > * (int*)b) ? 1 : (*(int *)a < * (int *)b) ? -1 : 0;
331 bondari 188 
}
189 
 
1780 jermar 190 
int uint8_t_cmp(void * a, void * b)
350 jermar 191 
{
1780 jermar 192 
    return (* (uint8_t *) a > * (uint8_t *)b) ? 1 : (*(uint8_t *)a < * (uint8_t *)b) ? -1 : 0;
331 bondari 193 
}
194 
 
1780 jermar 195 
int uint16_t_cmp(void * a, void * b)
350 jermar 196 
{
1780 jermar 197 
    return (* (uint16_t *) a > * (uint16_t *)b) ? 1 : (*(uint16_t *)a < * (uint16_t *)b) ? -1 : 0;
331 bondari 198 
}
199 
 
1780 jermar 200 
int uint32_t_cmp(void * a, void * b)
350 jermar 201 
{
1780 jermar 202 
    return (* (uint32_t *) a > * (uint32_t *)b) ? 1 : (*(uint32_t *)a < * (uint32_t *)b) ? -1 : 0;
331 bondari 203 
}
1702 cejka 204 
 
1757 jermar 205 
/** @}
1702 cejka 206 
 */