Mercurial > hg > octave-kai > gnulib-hg

annotate lib/mpsort.c @ 11527:4fe203c3f828

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Replace wcrtomb, wcsrtombs, wcsnrtombs if mbstate_t has to be replaced.
author Bruno Haible <bruno@clisp.org>
date Fri, 01 May 2009 18:01:52 +0200
parents bbbbbf4cd1c5
children e8d2c6fc33ad
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1 /* Sort a vector of pointers to data.
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2
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3 Copyright (C) 2007 Free Software Foundation, Inc.
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4
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bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+.
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
d95ff1660f83 * MODULES.html.sh: New module mpsort.
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13 GNU General Public License for more details.
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14
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bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+.
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 /* Written by Paul Eggert. */
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19
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20 #include <config.h>
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21
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22 #include "mpsort.h"
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23
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24 #include <string.h>
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25
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26 /* The type of qsort-style comparison functions. */
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27
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28 typedef int (*comparison_function) (void const *, void const *);
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29
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30 static void mpsort_with_tmp (void const **restrict, size_t,
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31 void const **restrict, comparison_function);
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32
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33 /* Sort a vector BASE containing N pointers, placing the sorted array
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34 into TMP. Compare pointers with CMP. N must be at least 2. */
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35
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36 static void
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37 mpsort_into_tmp (void const **restrict base, size_t n,
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38 void const **restrict tmp,
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39 comparison_function cmp)
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40 {
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41 size_t n1 = n / 2;
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42 size_t n2 = n - n1;
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43 size_t a = 0;
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44 size_t alim = n1;
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45 size_t b = n1;
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46 size_t blim = n;
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47 void const *ba;
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48 void const *bb;
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49
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50 mpsort_with_tmp (base + n1, n2, tmp, cmp);
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51 mpsort_with_tmp (base, n1, tmp, cmp);
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52
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53 ba = base[a];
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54 bb = base[b];
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55
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56 for (;;)
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57 if (cmp (ba, bb) <= 0)
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58 {
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59 *tmp++ = ba;
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60 a++;
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61 if (a == alim)
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62 {
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63 a = b;
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64 alim = blim;
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65 break;
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66 }
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67 ba = base[a];
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68 }
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69 else
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70 {
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71 *tmp++ = bb;
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72 b++;
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73 if (b == blim)
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74 break;
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75 bb = base[b];
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76 }
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77
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78 memcpy (tmp, base + a, (alim - a) * sizeof *base);
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79 }
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80
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81 /* Sort a vector BASE containing N pointers, in place. Use TMP
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82 (containing N / 2 pointers) for temporary storage. Compare
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83 pointers with CMP. */
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84
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85 static void
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86 mpsort_with_tmp (void const **restrict base, size_t n,
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87 void const **restrict tmp,
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88 comparison_function cmp)
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89 {
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90 if (n <= 2)
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91 {
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92 if (n == 2)
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93 {
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94 void const *p0 = base[0];
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95 void const *p1 = base[1];
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96 if (! (cmp (p0, p1) <= 0))
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97 {
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98 base[0] = p1;
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99 base[1] = p0;
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100 }
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101 }
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102 }
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103 else
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104 {
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105 size_t n1 = n / 2;
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106 size_t n2 = n - n1;
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107 size_t i;
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108 size_t t = 0;
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109 size_t tlim = n1;
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110 size_t b = n1;
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111 size_t blim = n;
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112 void const *bb;
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113 void const *tt;
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114
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115 mpsort_with_tmp (base + n1, n2, tmp, cmp);
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116
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117 if (n1 < 2)
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118 tmp[0] = base[0];
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119 else
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120 mpsort_into_tmp (base, n1, tmp, cmp);
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121
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122 tt = tmp[t];
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123 bb = base[b];
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124
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125 for (i = 0; ; )
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126 if (cmp (tt, bb) <= 0)
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127 {
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128 base[i++] = tt;
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129 t++;
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130 if (t == tlim)
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131 break;
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132 tt = tmp[t];
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133 }
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134 else
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135 {
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136 base[i++] = bb;
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137 b++;
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138 if (b == blim)
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139 {
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140 memcpy (base + i, tmp + t, (tlim - t) * sizeof *base);
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141 break;
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142 }
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143 bb = base[b];
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144 }
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145 }
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146 }
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147
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148 /* Sort a vector BASE containing N pointers, in place. BASE must
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149 contain enough storage to hold N + N / 2 vectors; the trailing
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150 vectors are used for temporaries. Compare pointers with CMP. */
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151
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152 void
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153 mpsort (void const **base, size_t n, comparison_function cmp)
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154 {
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155 mpsort_with_tmp (base, n, base + n, cmp);
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156 }