src/server/ucx/list.c

Sat, 12 Jan 2013 14:00:47 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sat, 12 Jan 2013 14:00:47 +0100
changeset 46
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parent 36
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child 71
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permissions
-rw-r--r--

cleaning up resources after requests

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1 #include "list.h"
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2
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3 UcxList *ucx_list_clone(UcxList *l, copy_func fnc, void *data) {
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4 UcxList *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_list_append(ret, fnc(l->data, data));
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8 } else {
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9 ret = ucx_list_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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15
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16 int ucx_list_equals(UcxList *l1, UcxList *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_list_free(UcxList *l) {
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33 UcxList *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 UcxList *ucx_list_append(UcxList *l, void *data) {
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42 UcxList *nl = (UcxList*) malloc(sizeof(UcxList));
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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 return nl;
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49 } else {
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50 UcxList *t = ucx_list_last(l);
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51 t->next = nl;
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52 return l;
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53 }
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54 }
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55
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56 UcxList *ucx_list_prepend(UcxList *l, void *data) {
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57 UcxList *nl = ucx_list_append(NULL, data);
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58 if (nl == NULL) return NULL;
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59
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60 if (l != NULL) {
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61 nl->next = l;
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62 }
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63 return nl;
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64 }
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65
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66 UcxList *ucx_list_concat(UcxList *l1, UcxList *l2) {
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67 if (l1 == NULL) {
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68 return l2;
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69 } else {
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70 UcxList *last = ucx_list_last(l1);
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71 last->next = l2;
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72 return l1;
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73 }
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74 }
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75
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76 UcxList *ucx_list_last(UcxList *l) {
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77 if (l == NULL) return NULL;
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78
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79 UcxList *e = l;
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80 while (e->next != NULL) {
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81 e = e->next;
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82 }
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83 return e;
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84 }
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85
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86 UcxList *ucx_list_get(UcxList *l, int index) {
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87 if (l == NULL) return NULL;
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88
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89 UcxList *e = l;
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90 while (e->next != NULL && index > 0) {
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91 e = e->next;
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92 index--;
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93 }
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94
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95 return index == 0 ? e : NULL;
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96 }
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97
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98 size_t ucx_list_size(UcxList *l) {
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99 if (l == NULL) return 0;
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100
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101 UcxList *e = l;
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102 size_t s = 1;
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103 while (e->next != NULL) {
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104 e = e->next;
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105 s++;
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106 }
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107
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108 return s;
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109 }
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110
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111 UcxList *ucx_list_sort_merge(int length,
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112 UcxList* ls, UcxList* rs, UcxList* le, UcxList* re,
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113 cmp_func fnc, void* data) {
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114 UcxList *sorted[length];
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115 UcxList *rc, *lc;
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116
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117 lc = ls; rc = rs;
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118 int n = 0;
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119 while (lc != le && rc != re) {
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120 if (fnc(lc->data, rc->data, data) <= 0) {
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121 sorted[n] = lc;
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122 lc = lc->next;
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123 } else {
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124 sorted[n] = rc;
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125 rc = rc->next;
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126 }
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127 n++;
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128 }
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129 while (lc != le) {
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130 sorted[n] = lc;
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131 lc = lc->next;
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132 n++;
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133 }
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134 while (rc != re) {
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135 sorted[n] = rc;
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136 rc = rc->next;
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137 n++;
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138 }
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139
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140 // Update pointer
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141 for (int i = 0 ; i < length-1 ; i++) {
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142 sorted[i]->next = sorted[i+1];
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143 }
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144 sorted[length-1]->next = NULL;
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145
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146 return sorted[0];
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147 }
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148
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149 UcxList *ucx_list_sort(UcxList *l, cmp_func fnc, void *data) {
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150 if (l == NULL) {
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151 return NULL;
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152 }
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153
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154 UcxList *lc;
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155 int ln = 1;
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156
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157 UcxList *ls = l, *le;
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158 lc = ls;
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159 while (lc->next != NULL && fnc(lc->next->data, lc->data, data) > 0) {
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160 lc = lc->next;
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161 ln++;
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162 }
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163 le = lc->next;
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164
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165 UcxList *rs = le, *re;
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166 if (rs == NULL) {
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167 return l; // this list is already sorted :)
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168 } else {
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169 UcxList *rc;
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170 int rn = 1;
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171 rc = rs;
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172 while (rc->next != NULL && fnc(rc->next->data, rc->data, data) > 0) {
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173 rc = rc->next;
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174 rn++;
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175 }
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176 re = rc->next;
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177
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178 // Something left? Sort it!
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179 UcxList *remainder = re;
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180 size_t remainder_length = ucx_list_size(remainder);
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181 if (remainder != NULL) {
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182 remainder = ucx_list_sort(remainder, fnc, data);
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183 }
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184
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185 // {ls,...,le->prev} and {rs,...,re->prev} are sorted - merge them
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186 UcxList *sorted = ucx_list_sort_merge(ln+rn,
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187 ls, rs, le, re,
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188 fnc, data);
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189
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190 // merge sorted list with (also sorted) remainder
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191 l = ucx_list_sort_merge(ln+rn+remainder_length,
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192 sorted, remainder, NULL, NULL,
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193 fnc, data);
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194
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195 return l;
15
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196 }
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197 }
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198
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199 /* list specific functions */
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200 UcxList *ucx_list_remove(UcxList *l, UcxList *e) {
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201 if (e == l) {
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202 l = e->next;
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203 free(e);
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204 } else {
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205 UcxList *f = l;
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206 while (f->next != NULL && f->next != e) {
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207 f = f->next;
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208 }
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209 /* perform remove if this element is found in this list */
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210 if (f->next == e) {
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211 f->next = e->next;
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212 free(e);
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213 }
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214 }
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215 return l;
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216 }

mercurial