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annotate lib/gl_array_oset.c @ 6976:c77399b5682d

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Ordered set data type implemented by an array.
author Bruno Haible <bruno@clisp.org>
date Mon, 17 Jul 2006 11:28:35 +0000
parents
children 1c4ed7637c24
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6976
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1 /* Ordered set data type implemented by an array.
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2 Copyright (C) 2006 Free Software Foundation, Inc.
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3 Written by Bruno Haible <bruno@clisp.org>, 2006.
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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
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16 along 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
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19 #ifdef HAVE_CONFIG_H
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20 # include <config.h>
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21 #endif
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22
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23 /* Specification. */
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24 #include "gl_array_oset.h"
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25
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26 #include <stdlib.h>
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27
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28 #include "xalloc.h"
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29
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30 /* Checked size_t computations. */
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31 #include "xsize.h"
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32
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33 /* -------------------------- gl_oset_t Data Type -------------------------- */
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34
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35 /* Concrete gl_oset_impl type, valid for this file only. */
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36 struct gl_oset_impl
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37 {
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38 struct gl_oset_impl_base base;
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39 /* An array of ALLOCATED elements, of which the first COUNT are used.
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40 0 <= COUNT <= ALLOCATED. */
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41 const void **elements;
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42 size_t count;
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43 size_t allocated;
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44 };
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45
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46 static gl_oset_t
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47 gl_array_create_empty (gl_oset_implementation_t implementation,
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48 gl_setelement_compar_fn compar_fn)
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49 {
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50 struct gl_oset_impl *set =
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51 (struct gl_oset_impl *) xmalloc (sizeof (struct gl_oset_impl));
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52
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53 set->base.vtable = implementation;
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54 set->base.compar_fn = compar_fn;
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55 set->elements = NULL;
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56 set->count = 0;
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57 set->allocated = 0;
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58
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59 return set;
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60 }
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61
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62 static size_t
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63 gl_array_size (gl_oset_t set)
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64 {
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65 return set->count;
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66 }
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67
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68 static size_t
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69 gl_array_indexof (gl_oset_t set, const void *elt)
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70 {
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71 size_t count = set->count;
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72
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73 if (count > 0)
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74 {
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75 gl_setelement_compar_fn compar = set->base.compar_fn;
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76 size_t low = 0;
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77 size_t high = count;
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78
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79 /* At each loop iteration, low < high; for indices < low the values
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80 are smaller than ELT; for indices >= high the values are greater
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81 than ELT. So, if the element occurs in the list, is at
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82 low <= position < high. */
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83 do
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84 {
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85 size_t mid = low + (high - low) / 2; /* low <= mid < high */
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86 int cmp = (compar != NULL
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87 ? compar (set->elements[mid], elt)
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88 : (set->elements[mid] > elt ? 1 :
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89 set->elements[mid] < elt ? -1 : 0));
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90
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91 if (cmp < 0)
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92 low = mid + 1;
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93 else if (cmp > 0)
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94 high = mid;
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95 else /* cmp == 0 */
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96 /* We have an element equal to ELT at index MID. */
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97 return mid;
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98 }
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99 while (low < high);
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100 }
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101 return (size_t)(-1);
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102 }
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103
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104 static bool
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105 gl_array_search (gl_oset_t set, const void *elt)
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106 {
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107 return gl_array_indexof (set, elt) != (size_t)(-1);
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108 }
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109
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110 /* Ensure that set->allocated > set->count. */
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111 static void
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112 grow (gl_oset_t set)
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113 {
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114 size_t new_allocated;
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115 size_t memory_size;
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116 const void **memory;
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117
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118 new_allocated = xtimes (set->allocated, 2);
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119 new_allocated = xsum (new_allocated, 1);
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120 memory_size = xtimes (new_allocated, sizeof (const void *));
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121 if (size_overflow_p (memory_size))
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122 /* Overflow, would lead to out of memory. */
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123 xalloc_die ();
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124 memory = (const void **) xrealloc (set->elements, memory_size);
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125 if (memory == NULL)
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126 /* Out of memory. */
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127 xalloc_die ();
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128 set->elements = memory;
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129 set->allocated = new_allocated;
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130 }
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131
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132 /* Add the given element ELT at the given position,
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133 0 <= position <= gl_oset_size (set). */
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134 static inline void
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135 gl_array_add_at (gl_oset_t set, size_t position, const void *elt)
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136 {
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137 size_t count = set->count;
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138 const void **elements;
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139 size_t i;
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140
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141 if (count == set->allocated)
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142 grow (set);
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143 elements = set->elements;
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144 for (i = count; i > position; i--)
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145 elements[i] = elements[i - 1];
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146 elements[position] = elt;
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147 set->count = count + 1;
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Bruno Haible <bruno@clisp.org>
parents:
diff changeset
148 }
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
149
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
150 /* Remove the element at the given position,
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
151 0 <= position < gl_oset_size (set). */
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
152 static inline void
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
153 gl_array_remove_at (gl_oset_t set, size_t position)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
154 {
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
155 size_t count = set->count;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
156 const void **elements;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
157 size_t i;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
158
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
159 elements = set->elements;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
160 for (i = position + 1; i < count; i++)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
161 elements[i - 1] = elements[i];
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
162 set->count = count - 1;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
163 }
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
164
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
165 static bool
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
166 gl_array_add (gl_oset_t set, const void *elt)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
167 {
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
168 size_t count = set->count;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
169 size_t low = 0;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
170
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
171 if (count > 0)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
172 {
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
173 gl_setelement_compar_fn compar = set->base.compar_fn;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
174 size_t high = count;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
175
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
176 /* At each loop iteration, low < high; for indices < low the values
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
177 are smaller than ELT; for indices >= high the values are greater
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
178 than ELT. So, if the element occurs in the list, is at
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
179 low <= position < high. */
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
180 do
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
181 {
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
182 size_t mid = low + (high - low) / 2; /* low <= mid < high */
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
183 int cmp = (compar != NULL
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
184 ? compar (set->elements[mid], elt)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
185 : (set->elements[mid] > elt ? 1 :
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
186 set->elements[mid] < elt ? -1 : 0));
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
187
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
188 if (cmp < 0)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
189 low = mid + 1;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
190 else if (cmp > 0)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
191 high = mid;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
192 else /* cmp == 0 */
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
193 return false;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
194 }
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
195 while (low < high);
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
196 }
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
197 gl_array_add_at (set, low, elt);
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
198 return true;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
199 }
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
200
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
201 static bool
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
202 gl_array_remove (gl_oset_t set, const void *elt)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
203 {
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
204 size_t index = gl_array_indexof (set, elt);
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
205 if (index != (size_t)(-1))
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
206 {
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
207 gl_array_remove_at (set, index);
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
208 return true;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
209 }
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
210 else
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
211 return false;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
212 }
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
213
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
214 static void
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
215 gl_array_free (gl_oset_t set)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
216 {
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
217 if (set->elements != NULL)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
218 free (set->elements);
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
219 free (set);
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
220 }
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
221
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
222 /* --------------------- gl_oset_iterator_t Data Type --------------------- */
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
223
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
224 static gl_oset_iterator_t
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
225 gl_array_iterator (gl_oset_t set)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
226 {
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
227 gl_oset_iterator_t result;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
228
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
229 result.vtable = set->base.vtable;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
230 result.set = set;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
231 result.count = set->count;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
232 result.p = set->elements + 0;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
233 result.q = set->elements + set->count;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
234
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
235 return result;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
236 }
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
237
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
238 static bool
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
239 gl_array_iterator_next (gl_oset_iterator_t *iterator, const void **eltp)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
240 {
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
241 gl_oset_t set = iterator->set;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
242 if (iterator->count != set->count)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
243 {
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
244 if (iterator->count != set->count + 1)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
245 /* Concurrent modifications were done on the set. */
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
246 abort ();
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
247 /* The last returned element was removed. */
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
248 iterator->count--;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
249 iterator->p--;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
250 iterator->q--;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
251 }
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
252 if (iterator->p < iterator->q)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
253 {
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
254 const void **p = (const void **) iterator->p;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
255 *eltp = *p;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
256 iterator->p = p + 1;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
257 return true;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
258 }
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
259 else
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
260 return false;
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
261 }
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
262
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
263 static void
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
264 gl_array_iterator_free (gl_oset_iterator_t *iterator)
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
265 {
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
266 }
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
267
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
268
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
269 const struct gl_oset_implementation gl_array_oset_implementation =
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
270 {
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
271 gl_array_create_empty,
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
272 gl_array_size,
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
273 gl_array_search,
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
274 gl_array_add,
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
275 gl_array_remove,
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
276 gl_array_free,
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
277 gl_array_iterator,
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
278 gl_array_iterator_next,
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
279 gl_array_iterator_free
c77399b5682d Ordered set data type implemented by an array.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
280 };