annotate gui/src/terminal/BlockArray.cpp @ 13506:c70511cf64ee

Reformatted to GNU Style.
author Jacob Dawid <jacob.dawid@googlemail.com>
date Sun, 17 Jul 2011 22:59:28 +0200 (2011-07-17)
parents 86d6c3b90ad7
children
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1 /*
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2 This file is part of Konsole, an X terminal.
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3 Copyright 2000 by Stephan Kulow <coolo@kde.org>
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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 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
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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
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17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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18 02110-1301 USA.
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19 */
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20
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21 // Own
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22 #include "BlockArray.h"
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23
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24 // System
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25 #include <assert.h>
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26 #include <sys/mman.h>
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27 #include <sys/param.h>
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28 #include <unistd.h>
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29 #include <stdio.h>
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30
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31 #define KDE_fseek ::fseek
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32 #define KDE_lseek ::lseek
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33
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34 static int blocksize = 0;
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35
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36 BlockArray::BlockArray ():size (0),
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37 current (size_t (-1)),
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38 index (size_t (-1)),
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39 lastmap (0), lastmap_index (size_t (-1)), lastblock (0), ion (-1), length (0)
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40 {
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41 // lastmap_index = index = current = size_t(-1);
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42 if (blocksize == 0)
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43 blocksize = ((sizeof (Block) / getpagesize ()) + 1) * getpagesize ();
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44
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45 }
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46
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47 BlockArray::~BlockArray ()
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48 {
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49 setHistorySize (0);
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50 assert (!lastblock);
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51 }
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52
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53 size_t
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54 BlockArray::append (Block * block)
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55 {
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56 if (!size)
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57 return size_t (-1);
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58
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59 ++current;
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60 if (current >= size)
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61 current = 0;
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62
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63 int rc;
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64 rc = KDE_lseek (ion, current * blocksize, SEEK_SET);
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65 if (rc < 0)
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66 {
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67 perror ("HistoryBuffer::add.seek");
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68 setHistorySize (0);
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69 return size_t (-1);
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70 }
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71 rc = write (ion, block, blocksize);
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72 if (rc < 0)
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73 {
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74 perror ("HistoryBuffer::add.write");
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75 setHistorySize (0);
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76 return size_t (-1);
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77 }
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78
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79 length++;
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80 if (length > size)
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81 length = size;
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82
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83 ++index;
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84
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85 delete block;
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86 return current;
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87 }
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88
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89 size_t
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90 BlockArray::newBlock ()
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91 {
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92 if (!size)
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93 return size_t (-1);
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94 append (lastblock);
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95
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96 lastblock = new Block ();
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97 return index + 1;
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98 }
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99
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100 Block *
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101 BlockArray::lastBlock () const
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102 {
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103 return lastblock;
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104 }
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105
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106 bool
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107 BlockArray::has (size_t i) const
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108 {
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109 if (i == index + 1)
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110 return true;
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111
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112 if (i > index)
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113 return false;
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114 if (index - i >= length)
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115 return false;
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116 return true;
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117 }
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118
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119 const Block *
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120 BlockArray::at (size_t i)
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121 {
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122 if (i == index + 1)
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123 return lastblock;
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124
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125 if (i == lastmap_index)
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126 return lastmap;
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127
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128 if (i > index)
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129 {
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130 //kDebug(1211) << "BlockArray::at() i > index\n";
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131 return 0;
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132 }
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133
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134 // if (index - i >= length) {
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135 // kDebug(1211) << "BlockArray::at() index - i >= length\n";
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136 // return 0;
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137 // }
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138
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139 size_t j = i; // (current - (index - i) + (index/size+1)*size) % size ;
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140
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141 assert (j < size);
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142 unmap ();
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143
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144 Block *block =
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145 (Block *) mmap (0, blocksize, PROT_READ, MAP_PRIVATE, ion, j * blocksize);
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146
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147 if (block == (Block *) - 1)
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148 {
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
149 perror ("mmap");
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
150 return 0;
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
151 }
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152
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diff changeset
153 lastmap = block;
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
154 lastmap_index = i;
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parents:
diff changeset
155
13506
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diff changeset
156 return block;
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86d6c3b90ad7 Added new gui files.
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parents:
diff changeset
157 }
86d6c3b90ad7 Added new gui files.
Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
158
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Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
159 void
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
160 BlockArray::unmap ()
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
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161 {
13506
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Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
162 if (lastmap)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
163 {
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
164 int res = munmap ((char *) lastmap, blocksize);
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
165 if (res < 0)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
166 perror ("munmap");
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parents:
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167 }
13506
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Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
168 lastmap = 0;
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Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
169 lastmap_index = size_t (-1);
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170 }
86d6c3b90ad7 Added new gui files.
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parents:
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171
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Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
172 bool
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
173 BlockArray::setSize (size_t newsize)
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
174 {
13506
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diff changeset
175 return setHistorySize (newsize * 1024 / blocksize);
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176 }
86d6c3b90ad7 Added new gui files.
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177
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Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
178 bool
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
179 BlockArray::setHistorySize (size_t newsize)
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180 {
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parents:
diff changeset
181 // kDebug(1211) << "setHistorySize " << size << " " << newsize;
86d6c3b90ad7 Added new gui files.
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182
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183 if (size == newsize)
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184 return false;
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185
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186 unmap ();
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187
13506
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diff changeset
188 if (!newsize)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
189 {
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
190 delete lastblock;
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
191 lastblock = 0;
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
192 if (ion >= 0)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
193 close (ion);
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
194 ion = -1;
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
195 current = size_t (-1);
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
196 return true;
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parents:
diff changeset
197 }
86d6c3b90ad7 Added new gui files.
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diff changeset
198
13506
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199 if (!size)
c70511cf64ee Reformatted to GNU Style.
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diff changeset
200 {
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
201 FILE *tmp = tmpfile ();
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
202 if (!tmp)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
203 {
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
204 perror ("konsole: cannot open temp file.\n");
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
205 }
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
206 else
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
207 {
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
208 ion = dup (fileno (tmp));
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
209 if (ion < 0)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
210 {
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
211 perror ("konsole: cannot dup temp file.\n");
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
212 fclose (tmp);
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
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diff changeset
213 }
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
214 }
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
215 if (ion < 0)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
216 return false;
13501
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parents:
diff changeset
217
13506
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parents: 13501
diff changeset
218 assert (!lastblock);
13501
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
219
13506
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Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
220 lastblock = new Block ();
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
221 size = newsize;
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
222 return false;
13501
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
223 }
86d6c3b90ad7 Added new gui files.
Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
224
13506
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Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
225 if (newsize > size)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
226 {
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
227 increaseBuffer ();
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
228 size = newsize;
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
229 return false;
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
230 }
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
231 else
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
232 {
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
233 decreaseBuffer (newsize);
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
234 if (ftruncate (ion, length * blocksize) == -1)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
235 perror ("ftruncate");
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
236 size = newsize;
13501
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
237
13506
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
238 return true;
13501
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
239 }
86d6c3b90ad7 Added new gui files.
Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
240 }
86d6c3b90ad7 Added new gui files.
Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
241
13506
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Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
242 void
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
243 moveBlock (FILE * fion, int cursor, int newpos, char *buffer2)
13501
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
244 {
13506
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Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
245 int res = KDE_fseek (fion, cursor * blocksize, SEEK_SET);
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
246 if (res)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
247 perror ("fseek");
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
248 res = fread (buffer2, blocksize, 1, fion);
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
249 if (res != 1)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
250 perror ("fread");
13501
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
251
13506
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
252 res = KDE_fseek (fion, newpos * blocksize, SEEK_SET);
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
253 if (res)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
254 perror ("fseek");
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
255 res = fwrite (buffer2, blocksize, 1, fion);
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
256 if (res != 1)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
257 perror ("fwrite");
13501
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
258 }
86d6c3b90ad7 Added new gui files.
Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
259
13506
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
260 void
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
261 BlockArray::decreaseBuffer (size_t newsize)
13501
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
262 {
13506
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Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
263 if (index < newsize) // still fits in whole
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
264 return;
13501
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
265
13506
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Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
266 int offset = (current - (newsize - 1) + size) % size;
13501
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
267
13506
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Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
268 if (!offset)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
269 return;
13501
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
270
13506
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Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
271 // The Block constructor could do somthing in future...
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
272 char *buffer1 = new char[blocksize];
13501
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
273
13506
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
274 FILE *fion = fdopen (dup (ion), "w+b");
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
275 if (!fion)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
276 {
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
277 delete[]buffer1;
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
278 perror ("fdopen/dup");
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
279 return;
13501
86d6c3b90ad7 Added new gui files.
Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
280 }
86d6c3b90ad7 Added new gui files.
Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
281
13506
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
282 int firstblock;
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
283 if (current <= newsize)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
284 {
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
285 firstblock = current + 1;
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
286 }
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
287 else
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
288 {
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
289 firstblock = 0;
13501
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Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
290 }
86d6c3b90ad7 Added new gui files.
Jacob Dawid <jacob.dawid@googlemail.com>
parents:
diff changeset
291
13506
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
292 size_t oldpos;
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
293 for (size_t i = 0, cursor = firstblock; i < newsize; i++)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
294 {
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
295 oldpos = (size + cursor + offset) % size;
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
296 moveBlock (fion, oldpos, cursor, buffer1);
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
297 if (oldpos < newsize)
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
298 {
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
299 cursor = oldpos;
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
300 }
c70511cf64ee Reformatted to GNU Style.
Jacob Dawid <jacob.dawid@googlemail.com>
parents: 13501
diff changeset
301 else
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302 cursor++;
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303 }
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304
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305 current = newsize - 1;
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306 length = newsize;
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307
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308 delete[]buffer1;
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309
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310 fclose (fion);
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311
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312 }
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313
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314 void
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315 BlockArray::increaseBuffer ()
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316 {
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317 if (index < size) // not even wrapped once
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318 return;
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319
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320 int offset = (current + size + 1) % size;
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321 if (!offset) // no moving needed
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322 return;
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323
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324 // The Block constructor could do somthing in future...
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325 char *buffer1 = new char[blocksize];
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326 char *buffer2 = new char[blocksize];
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327
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328 int runs = 1;
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329 int bpr = size; // blocks per run
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330
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331 if (size % offset == 0)
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332 {
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333 bpr = size / offset;
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334 runs = offset;
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335 }
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336
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337 FILE *fion = fdopen (dup (ion), "w+b");
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338 if (!fion)
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339 {
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340 perror ("fdopen/dup");
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341 delete[]buffer1;
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342 delete[]buffer2;
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343 return;
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344 }
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345
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346 int res;
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347 for (int i = 0; i < runs; i++)
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348 {
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349 // free one block in chain
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350 int firstblock = (offset + i) % size;
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351 res = KDE_fseek (fion, firstblock * blocksize, SEEK_SET);
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352 if (res)
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353 perror ("fseek");
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354 res = fread (buffer1, blocksize, 1, fion);
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355 if (res != 1)
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356 perror ("fread");
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357 int newpos = 0;
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358 for (int j = 1, cursor = firstblock; j < bpr; j++)
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359 {
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360 cursor = (cursor + offset) % size;
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361 newpos = (cursor - offset + size) % size;
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362 moveBlock (fion, cursor, newpos, buffer2);
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363 }
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364 res = KDE_fseek (fion, i * blocksize, SEEK_SET);
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365 if (res)
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366 perror ("fseek");
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367 res = fwrite (buffer1, blocksize, 1, fion);
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368 if (res != 1)
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369 perror ("fwrite");
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370 }
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371 current = size - 1;
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372 length = size;
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373
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374 delete[]buffer1;
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375 delete[]buffer2;
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376
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377 fclose (fion);
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378
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379 }