Fri, 30 Nov 2012 21:18:13 +0100
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1 | #include "dlist.h" |
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2 | |
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3 | UcxDlist *restrict ucx_dlist_clone(UcxDlist *restrict l, |
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4 | copy_func fnc, void *data) { |
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5 | UcxDlist *ret = NULL; |
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6 | while (l != NULL) { |
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7 | if (fnc != NULL) { |
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8 | ret = ucx_dlist_append(ret, fnc(l->data, data)); |
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9 | } else { |
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10 | ret = ucx_dlist_append(ret, l->data); |
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11 | } |
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12 | l = l->next; |
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13 | } |
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14 | return ret; |
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15 | } |
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16 | |
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17 | int ucx_dlist_equals(const UcxDlist *l1, const UcxDlist *l2, |
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18 | cmp_func fnc, void* data) { |
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19 | if (l1 == l2) return 1; |
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20 | |
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21 | while (l1 != NULL && l2 != NULL) { |
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22 | if (fnc == NULL) { |
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23 | if (l1->data != l2->data) return 0; |
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24 | } else { |
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25 | if (fnc(l1->data, l2->data, data) != 0) return 0; |
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26 | } |
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27 | l1 = l1->next; |
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28 | l2 = l2->next; |
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29 | } |
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30 | |
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31 | return (l1 == NULL && l2 == NULL); |
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32 | } |
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33 | |
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34 | void ucx_dlist_free(UcxDlist *l) { |
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35 | UcxDlist *e = l, *f; |
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36 | while (e != NULL) { |
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37 | f = e; |
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38 | e = e->next; |
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39 | free(f); |
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40 | } |
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41 | } |
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42 | |
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43 | UcxDlist *ucx_dlist_append(UcxDlist *l, void *data) { |
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44 | UcxDlist *nl = (UcxDlist*) malloc(sizeof(UcxDlist)); |
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45 | if (nl == NULL) return NULL; |
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46 | |
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47 | nl->data = data; |
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48 | nl->next = NULL; |
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49 | if (l == NULL) { |
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50 | nl->prev = NULL; |
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51 | return nl; |
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52 | } else { |
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53 | UcxDlist *t = ucx_dlist_last(l); |
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54 | t->next = nl; |
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55 | nl->prev = t; |
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56 | return l; |
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57 | } |
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58 | } |
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59 | |
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60 | UcxDlist *ucx_dlist_prepend(UcxDlist *l, void *data) { |
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61 | UcxDlist *nl = ucx_dlist_append(NULL, data); |
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62 | if (nl == NULL) return NULL; |
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63 | |
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64 | if (l != NULL) { |
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65 | nl->next = l; |
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66 | l->prev = nl; |
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67 | } |
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68 | return nl; |
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69 | } |
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70 | |
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71 | UcxDlist *ucx_dlist_concat(UcxDlist *restrict l1, UcxDlist *restrict l2) { |
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72 | if (l1 == NULL) { |
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73 | return l2; |
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74 | } else { |
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75 | UcxDlist *last = ucx_dlist_last(l1); |
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76 | last->next = l2; |
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77 | l2->prev = last; |
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78 | return l1; |
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79 | } |
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80 | } |
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81 | |
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82 | UcxDlist *ucx_dlist_last(const UcxDlist *l) { |
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83 | if (l == NULL) return NULL; |
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84 | |
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85 | const UcxDlist *e = l; |
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86 | while (e->next != NULL) { |
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87 | e = e->next; |
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88 | } |
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89 | return (UcxDlist*)e; |
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90 | } |
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91 | |
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92 | UcxDlist *ucx_dlist_get(const UcxDlist *l, int index) { |
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93 | if (l == NULL) return NULL; |
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94 | |
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95 | const UcxDlist *e = l; |
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96 | while (e->next != NULL && index > 0) { |
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97 | e = e->next; |
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98 | index--; |
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99 | } |
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100 | |
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101 | return (UcxDlist*)(index == 0 ? e : NULL); |
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102 | } |
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103 | |
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104 | size_t ucx_dlist_size(const UcxDlist *l) { |
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105 | if (l == NULL) return 0; |
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106 | |
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107 | const UcxDlist *e = l; |
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108 | size_t s = 1; |
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109 | while (e->next != NULL) { |
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110 | e = e->next; |
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111 | s++; |
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112 | } |
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113 | |
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114 | return s; |
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115 | } |
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116 | |
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117 | UcxDlist *ucx_dlist_sort_merge(int length, |
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118 | UcxDlist* restrict ls, UcxDlist* restrict le, UcxDlist* restrict re, |
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119 | cmp_func fnc, void* data) { |
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120 | |
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121 | UcxDlist** sorted = (UcxDlist**) malloc(sizeof(UcxDlist*)*length); |
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122 | UcxDlist *rc, *lc; |
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123 | |
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124 | lc = ls; rc = le; |
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125 | int n = 0; |
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126 | while (lc && lc != le && rc != re) { |
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127 | if (fnc(lc->data, rc->data, data) <= 0) { |
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128 | sorted[n] = lc; |
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129 | lc = lc->next; |
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130 | } else { |
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131 | sorted[n] = rc; |
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132 | rc = rc->next; |
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133 | } |
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134 | n++; |
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135 | } |
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136 | while (lc && lc != le) { |
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137 | sorted[n] = lc; |
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138 | lc = lc->next; |
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139 | n++; |
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140 | } |
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141 | while (rc && rc != re) { |
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142 | sorted[n] = rc; |
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143 | rc = rc->next; |
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144 | n++; |
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145 | } |
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146 | |
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147 | // Update pointer |
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148 | sorted[0]->prev = NULL; |
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149 | for (int i = 0 ; i < length-1 ; i++) { |
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150 | sorted[i]->next = sorted[i+1]; |
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151 | sorted[i+1]->prev = sorted[i]; |
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152 | } |
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153 | sorted[length-1]->next = NULL; |
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154 | |
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155 | UcxDlist *ret = sorted[0]; |
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156 | free(sorted); |
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157 | return ret; |
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158 | } |
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159 | |
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160 | UcxDlist *ucx_dlist_sort(UcxDlist *l, cmp_func fnc, void *data) { |
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161 | if (l == NULL) { |
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162 | return NULL; |
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163 | } |
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164 | |
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165 | UcxDlist *lc; |
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166 | int ln = 1; |
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167 | |
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168 | UcxDlist *restrict ls = l, *restrict le, *restrict re; |
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169 | lc = ls; |
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170 | while (lc->next != NULL && fnc(lc->next->data, lc->data, data) > 0) { |
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171 | lc = lc->next; |
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172 | ln++; |
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173 | } |
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174 | le = lc->next; |
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175 | |
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176 | if (le == NULL) { |
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177 | return l; // this list is already sorted :) |
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178 | } else { |
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179 | UcxDlist *rc; |
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180 | int rn = 1; |
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181 | rc = le; |
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182 | while (rc->next != NULL && fnc(rc->next->data, rc->data, data) > 0) { |
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183 | rc = rc->next; |
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184 | rn++; |
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185 | } |
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186 | re = rc->next; |
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187 | |
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188 | // Something left? Sort it! |
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189 | UcxDlist *remainder = re; |
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190 | size_t remainder_length = ucx_dlist_size(remainder); |
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191 | if (remainder != NULL) { |
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192 | remainder = ucx_dlist_sort(remainder, fnc, data); |
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193 | } |
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194 | |
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195 | // {ls,...,le->prev} and {rs,...,re->prev} are sorted - merge them |
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196 | UcxDlist *sorted = ucx_dlist_sort_merge(ln+rn, |
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197 | ls, le, re, |
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198 | fnc, data); |
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199 | |
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200 | // merge sorted list with (also sorted) remainder |
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201 | l = ucx_dlist_sort_merge(ln+rn+remainder_length, |
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202 | sorted, remainder, NULL, fnc, data); |
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203 | |
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204 | return l; |
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205 | } |
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206 | } |
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207 | |
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208 | /* dlist specific functions */ |
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209 | UcxDlist *ucx_dlist_first(const UcxDlist *l) { |
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210 | if (l == NULL) return NULL; |
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211 | |
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212 | const UcxDlist *e = l; |
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213 | while (e->prev != NULL) { |
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214 | e = e->prev; |
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215 | } |
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216 | return (UcxDlist *)e; |
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217 | } |
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218 | |
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219 | UcxDlist *ucx_dlist_remove(UcxDlist *l, UcxDlist *e) { |
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220 | if (e->prev == NULL) { |
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221 | if(e->next != NULL) { |
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222 | e->next->prev = NULL; |
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223 | l = e->next; |
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224 | } else { |
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225 | l = NULL; |
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226 | } |
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227 | |
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228 | } else { |
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229 | e->prev->next = e->next; |
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230 | e->next->prev = e->prev; |
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231 | } |
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232 | free(e); |
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233 | return l; |
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234 | } |