src/server/ucx/dlist.c

Sun, 17 Mar 2013 12:47:59 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sun, 17 Mar 2013 12:47:59 +0100
changeset 55
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parent 36
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child 71
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permissions
-rw-r--r--

vfs can read directories

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1 #include "dlist.h"
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2
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3 UcxDlist *ucx_dlist_clone(UcxDlist *l, copy_func fnc, void *data) {
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4 UcxDlist *ret = NULL;
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5 while (l != NULL) {
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6 if (fnc != NULL) {
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7 ret = ucx_dlist_append(ret, fnc(l->data, data));
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8 } else {
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9 ret = ucx_dlist_append(ret, l->data);
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10 }
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11 l = l->next;
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12 }
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13 return ret;
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14 }
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16 int ucx_dlist_equals(UcxDlist *l1, UcxDlist *l2, cmp_func fnc, void* data) {
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17 if (l1 == l2) return 1;
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18
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19 while (l1 != NULL && l2 != NULL) {
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20 if (fnc == NULL) {
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21 if (l1->data != l2->data) return 0;
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22 } else {
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23 if (fnc(l1->data, l2->data, data) != 0) return 0;
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24 }
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25 l1 = l1->next;
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26 l2 = l2->next;
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27 }
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28
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29 return (l1 == NULL && l2 == NULL);
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30 }
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31
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32 void ucx_dlist_free(UcxDlist *l) {
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33 UcxDlist *e = l, *f;
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34 while (e != NULL) {
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35 f = e;
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36 e = e->next;
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37 free(f);
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38 }
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39 }
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40
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41 UcxDlist *ucx_dlist_append(UcxDlist *l, void *data) {
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42 UcxDlist *nl = (UcxDlist*) malloc(sizeof(UcxDlist));
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43 if (nl == NULL) return NULL;
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44
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45 nl->data = data;
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46 nl->next = NULL;
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47 if (l == NULL) {
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48 nl->prev = NULL;
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49 return nl;
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50 } else {
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51 UcxDlist *t = ucx_dlist_last(l);
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52 t->next = nl;
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53 nl->prev = t;
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54 return l;
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55 }
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56 }
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57
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58 UcxDlist *ucx_dlist_prepend(UcxDlist *l, void *data) {
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59 UcxDlist *nl = ucx_dlist_append(NULL, data);
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60 if (nl == NULL) return NULL;
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61
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62 if (l != NULL) {
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63 nl->next = l;
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64 l->prev = nl;
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65 }
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66 return nl;
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67 }
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68
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69 UcxDlist *ucx_dlist_concat(UcxDlist *l1, UcxDlist *l2) {
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70 if (l1 == NULL) {
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71 return l2;
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72 } else {
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73 UcxDlist *last = ucx_dlist_last(l1);
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74 last->next = l2;
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75 l2->prev = last;
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76 return l1;
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77 }
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78 }
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79
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80 UcxDlist *ucx_dlist_last(UcxDlist *l) {
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81 if (l == NULL) return NULL;
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82
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83 UcxDlist *e = l;
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84 while (e->next != NULL) {
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85 e = e->next;
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86 }
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87 return e;
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88 }
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89
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90 UcxDlist *ucx_dlist_get(UcxDlist *l, int index) {
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91 if (l == NULL) return NULL;
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92
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93 UcxDlist *e = l;
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94 while (e->next != NULL && index > 0) {
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95 e = e->next;
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96 index--;
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97 }
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98
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99 return index == 0 ? e : NULL;
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100 }
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101
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102 size_t ucx_dlist_size(UcxDlist *l) {
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103 if (l == NULL) return 0;
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104
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105 UcxDlist *e = l;
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106 size_t s = 1;
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107 while (e->next != NULL) {
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108 e = e->next;
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109 s++;
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110 }
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111
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112 return s;
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113 }
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114
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115 UcxDlist *ucx_dlist_sort_merge(int length,
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116 UcxDlist* ls, UcxDlist* rs, UcxDlist* le, UcxDlist* re,
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117 cmp_func fnc, void* data) {
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118 UcxDlist *sorted[length];
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119 UcxDlist *rc, *lc;
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120
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121 lc = ls; rc = rs;
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122 int n = 0;
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123 while (lc != le && rc != re) {
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124 if (fnc(lc->data, rc->data, data) <= 0) {
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125 sorted[n] = lc;
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126 lc = lc->next;
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127 } else {
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128 sorted[n] = rc;
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129 rc = rc->next;
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130 }
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131 n++;
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132 }
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133 while (lc != le) {
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134 sorted[n] = lc;
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135 lc = lc->next;
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136 n++;
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137 }
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138 while (rc != re) {
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139 sorted[n] = rc;
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140 rc = rc->next;
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141 n++;
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142 }
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143
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144 // Update pointer
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145 sorted[0]->prev = NULL;
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146 for (int i = 0 ; i < length-1 ; i++) {
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147 sorted[i]->next = sorted[i+1];
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148 sorted[i+1]->prev = sorted[i];
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149 }
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150 sorted[length-1]->next = NULL;
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151
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152 return sorted[0];
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153 }
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154
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155 UcxDlist *ucx_dlist_sort(UcxDlist *l, cmp_func fnc, void *data) {
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156 if (l == NULL) {
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157 return NULL;
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158 }
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159
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160 UcxDlist *lc;
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161 int ln = 1;
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162
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163 UcxDlist *ls = l, *le;
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164 lc = ls;
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165 while (lc->next != NULL && fnc(lc->next->data, lc->data, data) > 0) {
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166 lc = lc->next;
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167 ln++;
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168 }
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169 le = lc->next;
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170
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171 UcxDlist *rs = le, *re;
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172 if (rs == NULL) {
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173 return l; // this list is already sorted :)
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174 } else {
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175 UcxDlist *rc;
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176 int rn = 1;
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177 rc = rs;
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178 while (rc->next != NULL && fnc(rc->next->data, rc->data, data) > 0) {
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179 rc = rc->next;
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180 rn++;
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181 }
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182 re = rc->next;
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183
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184 // Something left? Sort it!
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185 UcxDlist *remainder = re;
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186 size_t remainder_length = ucx_dlist_size(remainder);
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187 if (remainder != NULL) {
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188 remainder = ucx_dlist_sort(remainder, fnc, data);
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189 }
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190
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191 // {ls,...,le->prev} and {rs,...,re->prev} are sorted - merge them
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192 UcxDlist *sorted = ucx_dlist_sort_merge(ln+rn,
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193 ls, rs, le, re,
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194 fnc, data);
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195
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196 // merge sorted list with (also sorted) remainder
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197 l = ucx_dlist_sort_merge(ln+rn+remainder_length,
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198 sorted, remainder, NULL, NULL,
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199 fnc, data);
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200
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201 return l;
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202 }
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203 }
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204
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205 /* dlist specific functions */
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206 UcxDlist *ucx_dlist_first(UcxDlist *l) {
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207 if (l == NULL) return NULL;
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208
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209 UcxDlist *e = l;
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210 while (e->prev != NULL) {
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211 e = e->prev;
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212 }
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213 return e;
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214 }
30
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215
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216 UcxDlist *ucx_dlist_remove(UcxDlist *l, UcxDlist *e) {
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217 if (e->prev == NULL) {
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218 if(e->next != NULL) {
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219 e->next->prev = NULL;
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220 l = e->next;
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221 } else {
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222 l = NULL;
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223 }
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224
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225 } else {
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226 e->prev->next = e->next;
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227 e->next->prev = e->prev;
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228 }
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229 free(e);
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230 return l;
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231 }

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