Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/leptonica/src/stack.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 /*====================================================================*
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2 - Copyright (C) 2001 Leptonica. All rights reserved.
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3 -
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4 - Redistribution and use in source and binary forms, with or without
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5 - modification, are permitted provided that the following conditions
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6 - are met:
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7 - 1. Redistributions of source code must retain the above copyright
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8 - notice, this list of conditions and the following disclaimer.
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9 - 2. Redistributions in binary form must reproduce the above
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10 - copyright notice, this list of conditions and the following
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11 - disclaimer in the documentation and/or other materials
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12 - provided with the distribution.
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13 -
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14 - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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15 - ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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16 - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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17 - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANY
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18 - CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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19 - EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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20 - PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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21 - PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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22 - OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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23 - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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24 - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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25 *====================================================================*/
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27 /*!
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28 * \file stack.c
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29 * <pre>
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30 *
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31 * Generic stack
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32 *
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33 * The lstack is an array of void * ptrs, onto which
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34 * objects can be stored. At any time, the number of
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35 * stored objects is lstack->n. The object at the bottom
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36 * of the lstack is at array[0]; the object at the top of
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37 * the lstack is at array[n-1]. New objects are added
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38 * to the top of the lstack; i.e., the first available
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39 * location, which is at array[n]. The lstack is expanded
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40 * by doubling, when needed. Objects are removed
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41 * from the top of the lstack. When an attempt is made
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42 * to remove an object from an empty lstack, the result is null.
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43 *
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44 * Create/Destroy
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45 * L_STACK *lstackCreate()
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46 * void lstackDestroy()
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47 *
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48 * Accessors
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49 * l_int32 lstackAdd()
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50 * void *lstackRemove()
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51 * static l_int32 lstackExtendArray()
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52 * l_int32 lstackGetCount()
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53 *
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54 * Text description
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55 * l_int32 lstackPrint()
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56 * </pre>
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57 */
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58
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59 #ifdef HAVE_CONFIG_H
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60 #include <config_auto.h>
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61 #endif /* HAVE_CONFIG_H */
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62
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63 #include "allheaders.h"
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64
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65 /* Bounds on initial array size */
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66 static const l_uint32 MaxPtrArraySize = 100000;
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67 static const l_int32 InitialPtrArraySize = 20; /*!< n'importe quoi */
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68
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69 /* Static function */
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70 static l_int32 lstackExtendArray(L_STACK *lstack);
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71
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72 /*---------------------------------------------------------------------*
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73 * Create/Destroy *
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74 *---------------------------------------------------------------------*/
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75 /*!
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76 * \brief lstackCreate()
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77 *
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78 * \param[in] n initial ptr array size; use 0 for default
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79 * \return lstack, or NULL on error
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80 */
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81 L_STACK *
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82 lstackCreate(l_int32 n)
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83 {
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84 L_STACK *lstack;
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85
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86 if (n <= 0 || n > (l_int32)MaxPtrArraySize)
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87 n = InitialPtrArraySize;
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88
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89 lstack = (L_STACK *)LEPT_CALLOC(1, sizeof(L_STACK));
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90 lstack->array = (void **)LEPT_CALLOC(n, sizeof(void *));
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91 if (!lstack->array) {
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92 lstackDestroy(&lstack, FALSE);
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93 return (L_STACK *)ERROR_PTR("lstack array not made", __func__, NULL);
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94 }
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95
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96 lstack->nalloc = n;
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97 lstack->n = 0;
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98 return lstack;
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99 }
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100
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101
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102 /*!
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103 * \brief lstackDestroy()
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104 *
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105 * \param[in,out] plstack will be set to null before returning
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106 * \param[in] freeflag TRUE to free each remaining struct in the array
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107 * \return void
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108 *
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109 * <pre>
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110 * Notes:
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111 * (1) If %freeflag is TRUE, frees each struct in the array.
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112 * (2) If %freeflag is FALSE but there are elements on the array,
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113 * gives a warning and destroys the array. This will
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114 * cause a memory leak of all the items that were on the lstack.
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115 * So if the items require their own destroy function, they
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116 * must be destroyed before the lstack.
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117 * (3) To destroy the lstack, we destroy the ptr array, then
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118 * the lstack, and then null the contents of the input ptr.
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119 * </pre>
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120 */
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121 void
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122 lstackDestroy(L_STACK **plstack,
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123 l_int32 freeflag)
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124 {
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125 void *item;
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126 L_STACK *lstack;
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127
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128 if (plstack == NULL) {
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129 L_WARNING("ptr address is NULL\n", __func__);
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130 return;
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131 }
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132 if ((lstack = *plstack) == NULL)
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133 return;
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134
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135 if (freeflag) {
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136 while(lstack->n > 0) {
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137 item = lstackRemove(lstack);
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138 LEPT_FREE(item);
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139 }
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140 } else if (lstack->n > 0) {
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141 L_WARNING("memory leak of %d items in lstack\n", __func__, lstack->n);
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142 }
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143
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144 if (lstack->auxstack)
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145 lstackDestroy(&lstack->auxstack, freeflag);
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146
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147 if (lstack->array)
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148 LEPT_FREE(lstack->array);
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149 LEPT_FREE(lstack);
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150 *plstack = NULL;
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151 }
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152
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153
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154
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155 /*---------------------------------------------------------------------*
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156 * Accessors *
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157 *---------------------------------------------------------------------*/
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158 /*!
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159 * \brief lstackAdd()
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160 *
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161 * \param[in] lstack
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162 * \param[in] item to be added to the lstack
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163 * \return 0 if OK; 1 on error.
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164 */
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165 l_ok
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166 lstackAdd(L_STACK *lstack,
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167 void *item)
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168 {
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169 if (!lstack)
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170 return ERROR_INT("lstack not defined", __func__, 1);
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171 if (!item)
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172 return ERROR_INT("item not defined", __func__, 1);
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173
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174 /* Do we need to extend the array? */
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175 if (lstack->n >= lstack->nalloc) {
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176 if (lstackExtendArray(lstack))
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177 return ERROR_INT("extension failed", __func__, 1);
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178 }
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179
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180 /* Store the new pointer */
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181 lstack->array[lstack->n] = (void *)item;
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182 lstack->n++;
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183
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184 return 0;
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185 }
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186
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187
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188 /*!
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189 * \brief lstackRemove()
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190 *
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191 * \param[in] lstack
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192 * \return ptr to item popped from the top of the lstack,
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193 * or NULL if the lstack is empty or on error
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194 */
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195 void *
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196 lstackRemove(L_STACK *lstack)
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197 {
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198 void *item;
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199
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200 if (!lstack)
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201 return ERROR_PTR("lstack not defined", __func__, NULL);
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202
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203 if (lstack->n == 0)
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204 return NULL;
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205
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206 lstack->n--;
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207 item = lstack->array[lstack->n];
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208
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209 return item;
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210 }
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211
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212
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213 /*!
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214 * \brief lstackExtendArray()
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215 *
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216 * \param[in] lstack
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217 * \return 0 if OK; 1 on error
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218 */
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219 static l_int32
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220 lstackExtendArray(L_STACK *lstack)
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221 {
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222 if (!lstack)
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223 return ERROR_INT("lstack not defined", __func__, 1);
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224
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225 if ((lstack->array = (void **)reallocNew((void **)&lstack->array,
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226 sizeof(void *) * lstack->nalloc,
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227 2 * sizeof(void *) * lstack->nalloc)) == NULL)
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228 return ERROR_INT("new lstack array not defined", __func__, 1);
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229
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230 lstack->nalloc = 2 * lstack->nalloc;
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231 return 0;
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232 }
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233
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234
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235 /*!
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236 * \brief lstackGetCount()
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237 *
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238 * \param[in] lstack
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239 * \return count, or 0 on error
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240 */
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241 l_int32
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242 lstackGetCount(L_STACK *lstack)
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243 {
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244 if (!lstack)
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245 return ERROR_INT("lstack not defined", __func__, 1);
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246
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247 return lstack->n;
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248 }
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249
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250
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251
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252 /*---------------------------------------------------------------------*
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253 * Debug output *
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254 *---------------------------------------------------------------------*/
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255 /*!
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256 * \brief lstackPrint()
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257 *
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258 * \param[in] fp file stream
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259 * \param[in] lstack
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260 * \return 0 if OK; 1 on error
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261 */
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262 l_ok
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263 lstackPrint(FILE *fp,
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264 L_STACK *lstack)
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265 {
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266 l_int32 i;
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267
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268 if (!fp)
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269 return ERROR_INT("stream not defined", __func__, 1);
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270 if (!lstack)
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271 return ERROR_INT("lstack not defined", __func__, 1);
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272
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273 fprintf(fp, "\n Stack: nalloc = %d, n = %d, array = %p\n",
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274 lstack->nalloc, lstack->n, lstack->array);
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275 for (i = 0; i < lstack->n; i++)
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276 fprintf(fp, "array[%d] = %p\n", i, lstack->array[i]);
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277
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278 return 0;
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279 }