Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/lib/splay.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 * _ _ ____ _
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3 * Project ___| | | | _ \| |
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4 * / __| | | | |_) | |
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5 * | (__| |_| | _ <| |___
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6 * \___|\___/|_| \_\_____|
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7 *
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8 * Copyright (C) 1997 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 *
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10 * This software is licensed as described in the file COPYING, which
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11 * you should have received as part of this distribution. The terms
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12 * are also available at https://curl.haxx.se/docs/copyright.html.
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13 *
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14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 * copies of the Software, and permit persons to whom the Software is
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16 * furnished to do so, under the terms of the COPYING file.
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17 *
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18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 * KIND, either express or implied.
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20 *
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21 ***************************************************************************/
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22
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23 #include "curl_setup.h"
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24
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25 #include "splay.h"
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27 /*
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28 * This macro compares two node keys i and j and returns:
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29 *
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30 * negative value: when i is smaller than j
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31 * zero : when i is equal to j
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32 * positive when : when i is larger than j
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33 */
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34 #define compare(i,j) Curl_splaycomparekeys((i),(j))
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35
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36 /*
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37 * Splay using the key i (which may or may not be in the tree.) The starting
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38 * root is t.
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39 */
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40 struct Curl_tree *Curl_splay(struct curltime i,
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41 struct Curl_tree *t)
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42 {
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43 struct Curl_tree N, *l, *r, *y;
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44
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45 if(t == NULL)
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46 return t;
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47 N.smaller = N.larger = NULL;
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48 l = r = &N;
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49
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50 for(;;) {
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51 long comp = compare(i, t->key);
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52 if(comp < 0) {
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53 if(t->smaller == NULL)
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54 break;
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55 if(compare(i, t->smaller->key) < 0) {
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56 y = t->smaller; /* rotate smaller */
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57 t->smaller = y->larger;
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58 y->larger = t;
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59 t = y;
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60 if(t->smaller == NULL)
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61 break;
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62 }
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63 r->smaller = t; /* link smaller */
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64 r = t;
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65 t = t->smaller;
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66 }
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67 else if(comp > 0) {
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68 if(t->larger == NULL)
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69 break;
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70 if(compare(i, t->larger->key) > 0) {
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71 y = t->larger; /* rotate larger */
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72 t->larger = y->smaller;
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73 y->smaller = t;
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74 t = y;
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75 if(t->larger == NULL)
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76 break;
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77 }
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78 l->larger = t; /* link larger */
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79 l = t;
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80 t = t->larger;
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81 }
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82 else
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83 break;
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84 }
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85
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86 l->larger = t->smaller; /* assemble */
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87 r->smaller = t->larger;
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88 t->smaller = N.larger;
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89 t->larger = N.smaller;
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90
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91 return t;
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92 }
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93
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94 /* Insert key i into the tree t. Return a pointer to the resulting tree or
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95 * NULL if something went wrong.
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96 *
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97 * @unittest: 1309
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98 */
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99 struct Curl_tree *Curl_splayinsert(struct curltime i,
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100 struct Curl_tree *t,
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101 struct Curl_tree *node)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
102 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
103 static const struct curltime KEY_NOTUSED = {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
104 (time_t)-1, (unsigned int)-1
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
105 }; /* will *NEVER* appear */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
106
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
107 if(node == NULL)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
108 return t;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
109
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
110 if(t != NULL) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
111 t = Curl_splay(i, t);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
112 if(compare(i, t->key) == 0) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
113 /* There already exists a node in the tree with the very same key. Build
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
114 a doubly-linked circular list of nodes. We add the new 'node' struct
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
115 to the end of this list. */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
116
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
117 node->key = KEY_NOTUSED; /* we set the key in the sub node to NOTUSED
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
118 to quickly identify this node as a subnode */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
119 node->samen = t;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
120 node->samep = t->samep;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
121 t->samep->samen = node;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
122 t->samep = node;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
123
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
124 return t; /* the root node always stays the same */
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Franz Glasner <fzglas.hg@dom66.de>
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125 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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126 }
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parents:
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127
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
128 if(t == NULL) {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
129 node->smaller = node->larger = NULL;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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130 }
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parents:
diff changeset
131 else if(compare(i, t->key) < 0) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
132 node->smaller = t->smaller;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
133 node->larger = t;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
134 t->smaller = NULL;
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parents:
diff changeset
135
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
136 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
137 else {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
138 node->larger = t->larger;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
139 node->smaller = t;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
140 t->larger = NULL;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
141 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
142 node->key = i;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
143
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
144 /* no identical nodes (yet), we are the only one in the list of nodes */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
145 node->samen = node;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
146 node->samep = node;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
147 return node;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
148 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
149
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
150 /* Finds and deletes the best-fit node from the tree. Return a pointer to the
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
151 resulting tree. best-fit means the smallest node if it is not larger than
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
152 the key */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
153 struct Curl_tree *Curl_splaygetbest(struct curltime i,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 struct Curl_tree *t,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
155 struct Curl_tree **removed)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
156 {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
157 static struct curltime tv_zero = {0, 0};
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
158 struct Curl_tree *x;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
159
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
160 if(!t) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 *removed = NULL; /* none removed since there was no root */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 return NULL;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
163 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
164
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
165 /* find smallest */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 t = Curl_splay(tv_zero, t);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 if(compare(i, t->key) < 0) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
168 /* even the smallest is too big */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
169 *removed = NULL;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
170 return t;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
171 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
172
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
173 /* FIRST! Check if there is a list with identical keys */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
174 x = t->samen;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 if(x != t) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 /* there is, pick one from the list */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 /* 'x' is the new root node */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
179
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
180 x->key = t->key;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
181 x->larger = t->larger;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
182 x->smaller = t->smaller;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 x->samep = t->samep;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 t->samep->samen = x;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 *removed = t;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 return x; /* new root */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 /* we splayed the tree to the smallest element, there is no smaller */
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
191 x = t->larger;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
192 *removed = t;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 return x;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 }
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
196
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
197
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
198 /* Deletes the very node we point out from the tree if it's there. Stores a
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
199 * pointer to the new resulting tree in 'newroot'.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
200 *
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
201 * Returns zero on success and non-zero on errors!
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
202 * When returning error, it does not touch the 'newroot' pointer.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
203 *
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
204 * NOTE: when the last node of the tree is removed, there's no tree left so
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205 * 'newroot' will be made to point to NULL.
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206 *
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207 * @unittest: 1309
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208 */
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209 int Curl_splayremovebyaddr(struct Curl_tree *t,
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210 struct Curl_tree *removenode,
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211 struct Curl_tree **newroot)
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212 {
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213 static const struct curltime KEY_NOTUSED = {
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214 (time_t)-1, (unsigned int)-1
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215 }; /* will *NEVER* appear */
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216 struct Curl_tree *x;
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217
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218 if(!t || !removenode)
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219 return 1;
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220
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221 if(compare(KEY_NOTUSED, removenode->key) == 0) {
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222 /* Key set to NOTUSED means it is a subnode within a 'same' linked list
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223 and thus we can unlink it easily. */
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224 if(removenode->samen == removenode)
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225 /* A non-subnode should never be set to KEY_NOTUSED */
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226 return 3;
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227
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228 removenode->samep->samen = removenode->samen;
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229 removenode->samen->samep = removenode->samep;
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230
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231 /* Ensures that double-remove gets caught. */
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232 removenode->samen = removenode;
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233
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234 *newroot = t; /* return the same root */
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235 return 0;
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236 }
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237
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238 t = Curl_splay(removenode->key, t);
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239
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240 /* First make sure that we got the same root node as the one we want
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241 to remove, as otherwise we might be trying to remove a node that
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242 isn't actually in the tree.
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243
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244 We cannot just compare the keys here as a double remove in quick
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245 succession of a node with key != KEY_NOTUSED && same != NULL
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246 could return the same key but a different node. */
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247 if(t != removenode)
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248 return 2;
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249
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250 /* Check if there is a list with identical sizes, as then we're trying to
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251 remove the root node of a list of nodes with identical keys. */
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252 x = t->samen;
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253 if(x != t) {
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254 /* 'x' is the new root node, we just make it use the root node's
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255 smaller/larger links */
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256
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257 x->key = t->key;
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258 x->larger = t->larger;
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259 x->smaller = t->smaller;
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260 x->samep = t->samep;
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261 t->samep->samen = x;
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262 }
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263 else {
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264 /* Remove the root node */
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265 if(t->smaller == NULL)
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266 x = t->larger;
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267 else {
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268 x = Curl_splay(removenode->key, t->smaller);
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269 x->larger = t->larger;
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270 }
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271 }
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272
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273 *newroot = x; /* store new root pointer */
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274
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275 return 0;
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276 }