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annotate lib/mpsort.c @ 8052:f4e98fccacf0

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* lib/mpsort.c (mpsort): Remove spurious "return" in void function.
author Jim Meyering <jim@meyering.net>
date Tue, 30 Jan 2007 21:39:19 +0000
parents d95ff1660f83
children bbbbbf4cd1c5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
8046
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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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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 2, or (at your option)
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8 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
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License along
d95ff1660f83 * MODULES.html.sh: New module mpsort.
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16 with this program; if not, write to the Free Software Foundation,
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17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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18
d95ff1660f83 * MODULES.html.sh: New module mpsort.
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19 /* Written by Paul Eggert. */
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20
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21 #include <config.h>
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22
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23 #include "mpsort.h"
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24
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25 #include <string.h>
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26
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27 /* The type of qsort-style comparison functions. */
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28
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29 typedef int (*comparison_function) (void const *, void const *);
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30
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31 static void mpsort_with_tmp (void const **restrict, size_t,
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32 void const **restrict, comparison_function);
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33
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34 /* Sort a vector BASE containing N pointers, placing the sorted array
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35 into TMP. Compare pointers with CMP. N must be at least 2. */
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36
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37 static void
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38 mpsort_into_tmp (void const **restrict base, size_t n,
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39 void const **restrict tmp,
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40 comparison_function cmp)
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41 {
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42 size_t n1 = n / 2;
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43 size_t n2 = n - n1;
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44 size_t a = 0;
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45 size_t alim = n1;
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46 size_t b = n1;
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47 size_t blim = n;
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48 void const *ba;
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49 void const *bb;
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50
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51 mpsort_with_tmp (base + n1, n2, tmp, cmp);
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52 mpsort_with_tmp (base, n1, tmp, cmp);
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53
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54 ba = base[a];
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55 bb = base[b];
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56
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57 for (;;)
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58 if (cmp (ba, bb) <= 0)
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59 {
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60 *tmp++ = ba;
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61 a++;
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62 if (a == alim)
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63 {
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64 a = b;
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65 alim = blim;
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66 break;
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67 }
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68 ba = base[a];
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69 }
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70 else
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71 {
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72 *tmp++ = bb;
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73 b++;
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74 if (b == blim)
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75 break;
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76 bb = base[b];
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77 }
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78
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79 memcpy (tmp, base + a, (alim - a) * sizeof *base);
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80 }
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81
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82 /* Sort a vector BASE containing N pointers, in place. Use TMP
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83 (containing N / 2 pointers) for temporary storage. Compare
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84 pointers with CMP. */
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85
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86 static void
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87 mpsort_with_tmp (void const **restrict base, size_t n,
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88 void const **restrict tmp,
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89 comparison_function cmp)
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90 {
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91 if (n <= 2)
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92 {
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93 if (n == 2)
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94 {
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95 void const *p0 = base[0];
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96 void const *p1 = base[1];
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97 if (! (cmp (p0, p1) <= 0))
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98 {
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99 base[0] = p1;
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100 base[1] = p0;
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101 }
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102 }
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103 }
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104 else
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105 {
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106 size_t n1 = n / 2;
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107 size_t n2 = n - n1;
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108 size_t i;
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109 size_t t = 0;
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110 size_t tlim = n1;
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111 size_t b = n1;
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112 size_t blim = n;
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113 void const *bb;
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114 void const *tt;
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115
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116 mpsort_with_tmp (base + n1, n2, tmp, cmp);
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117
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118 if (n1 < 2)
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119 tmp[0] = base[0];
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120 else
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121 mpsort_into_tmp (base, n1, tmp, cmp);
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122
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123 tt = tmp[t];
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124 bb = base[b];
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125
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126 for (i = 0; ; )
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127 if (cmp (tt, bb) <= 0)
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128 {
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129 base[i++] = tt;
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130 t++;
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131 if (t == tlim)
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132 break;
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133 tt = tmp[t];
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134 }
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135 else
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136 {
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137 base[i++] = bb;
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138 b++;
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139 if (b == blim)
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140 {
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141 memcpy (base + i, tmp + t, (tlim - t) * sizeof *base);
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142 break;
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143 }
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144 bb = base[b];
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145 }
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146 }
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147 }
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148
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149 /* Sort a vector BASE containing N pointers, in place. BASE must
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150 contain enough storage to hold N + N / 2 vectors; the trailing
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151 vectors are used for temporaries. Compare pointers with CMP. */
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152
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153 void
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154 mpsort (void const **base, size_t n, comparison_function cmp)
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155 {
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156 mpsort_with_tmp (base, n, base + n, cmp);
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157 }