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jbe@352
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1 #include <stdlib.h>
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2 #include <stdio.h>
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3 #include <string.h>
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4 #include <libpq-fe.h>
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5 #include <search.h>
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6
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7 static char *escapeLiteral(PGconn *conn, const char *str, size_t len) {
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8 // provides compatibility for PostgreSQL versions prior 9.0
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9 // in future: return PQescapeLiteral(conn, str, len);
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10 char *res;
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11 size_t res_len;
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12 res = malloc(2*len+3);
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13 res[0] = '\'';
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14 res_len = PQescapeStringConn(conn, res+1, str, len, NULL);
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15 res[res_len+1] = '\'';
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16 res[res_len+2] = 0;
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17 return res;
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18 }
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19
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20 static void freemem(void *ptr) {
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21 // to be used for "escapeLiteral" function
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22 // provides compatibility for PostgreSQL versions prior 9.0
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23 // in future: PQfreemem(ptr);
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24 free(ptr);
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25 }
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26
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27 #define COL_MEMBER_ID 0
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28 #define COL_WEIGHT 1
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29 #define COL_PREFERENCE 2
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30 #define COL_SUGGESTION_ID 3
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31
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32 struct candidate {
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33 char *key;
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34 double score;
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35 int seat;
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36 };
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37
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38 static int compare_candidate(struct candidate *c1, struct candidate *c2) {
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39 return strcmp(c1->key, c2->key);
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40 }
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41
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42 static int candidate_count;
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43 static struct candidate *candidates;
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44
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45 static void register_candidate(char **candidate_key, VISIT visit, int level) {
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46 if (visit == postorder || visit == leaf) {
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47 struct candidate *candidate;
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48 candidate = candidates + (candidate_count++);
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49 candidate->key = *candidate_key;
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50 candidate->score = 0.0;
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51 candidate->seat = 0;
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52 }
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53 }
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54
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55 static struct candidate *candidate_by_key(char *candidate_key) {
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56 struct candidate *candidate;
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57 struct candidate compare;
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58 compare.key = candidate_key;
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59 candidate = bsearch(&compare, candidates, candidate_count, sizeof(struct candidate), (void *)compare_candidate);
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60 if (!candidate) {
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61 fprintf(stderr, "Candidate not found (should not happen)\n");
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62 abort();
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63 }
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64 return candidate;
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65 }
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66
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67 struct ballot_section {
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68 int count;
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69 struct candidate **candidates;
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70 };
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71
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72 struct ballot {
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73 int weight;
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74 struct ballot_section sections[4];
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75 };
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76
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77 static void process_initiative(PGresult *res) {
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78 int ballot_count = 0;
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79 int i;
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80 struct ballot *ballots;
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81 {
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82 void *candidate_tree = NULL;
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83 int tuple_count;
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84 char *old_member_id = NULL;
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85 struct ballot *ballot;
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86 int candidates_in_sections[4] = {0, };
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87 candidate_count = 0;
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88 tuple_count = PQntuples(res);
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89 for (i=0; i<=tuple_count; i++) {
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90 char *member_id, *suggestion_id;
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91 if (i<tuple_count) {
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92 member_id = PQgetvalue(res, i, COL_MEMBER_ID);
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93 suggestion_id = PQgetvalue(res, i, COL_SUGGESTION_ID);
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94 if (!candidate_tree || !tfind(suggestion_id, &candidate_tree, (void *)strcmp)) {
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95 candidate_count++;
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96 if (!tsearch(suggestion_id, &candidate_tree, (void *)strcmp)) {
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97 fprintf(stderr, "Insufficient memory\n");
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98 abort();
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99 }
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100 }
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101 }
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102 if (i==tuple_count || (old_member_id && strcmp(old_member_id, member_id))) {
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103 ballot_count++;
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104 }
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105 old_member_id = member_id;
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106 }
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107 printf("Candidate count: %i\n", candidate_count);
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108 candidates = malloc(candidate_count * sizeof(struct candidate));
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109 if (!candidates) {
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110 fprintf(stderr, "Insufficient memory\n");
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111 abort();
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112 }
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113 candidate_count = 0;
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114 twalk(candidate_tree, (void *)register_candidate);
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115 while (candidate_tree) tdelete(*(void **)candidate_tree, &candidate_tree, (void *)strcmp);
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116 printf("Ballot count: %i\n", ballot_count);
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117 ballots = calloc(ballot_count, sizeof(struct ballot));
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118 if (!ballots) {
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119 fprintf(stderr, "Insufficient memory\n");
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120 abort();
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121 }
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122 ballot = ballots;
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123 for (i=0; i<tuple_count; i++) {
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124 char *member_id, *suggestion_id;
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125 int weight, preference;
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126 member_id = PQgetvalue(res, i, COL_MEMBER_ID);
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127 suggestion_id = PQgetvalue(res, i, COL_SUGGESTION_ID);
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128 weight = (int)strtol(PQgetvalue(res, i, COL_WEIGHT), (char **)NULL, 10);
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129 if (weight <= 0) {
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130 fprintf(stderr, "Unexpected weight value\n");
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131 abort();
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132 }
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133 preference = (int)strtol(PQgetvalue(res, i, COL_PREFERENCE), (char **)NULL, 10);
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134 if (preference < 1 || preference > 4) {
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135 fprintf(stderr, "Unexpected preference value\n");
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136 abort();
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137 }
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138 preference--;
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139 ballot->weight = weight;
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140 ballot->sections[preference].count++;
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141 if (old_member_id && strcmp(old_member_id, member_id)) ballot++;
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142 old_member_id = member_id;
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143 }
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144 for (i=0; i<ballot_count; i++) {
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145 int j;
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146 for (j=0; j<4; j++) {
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147 if (ballots[i].sections[j].count) {
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148 ballots[i].sections[j].candidates = malloc(ballots[i].sections[j].count * sizeof(struct candidate *));
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149 if (!ballots[i].sections[j].candidates) {
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150 fprintf(stderr, "Insufficient memory\n");
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151 abort();
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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 ballot = ballots;
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157 for (i=0; i<=tuple_count; i++) {
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158 char *member_id, *suggestion_id;
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159 int preference;
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160 if (i<tuple_count) {
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161 member_id = PQgetvalue(res, i, COL_MEMBER_ID);
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162 suggestion_id = PQgetvalue(res, i, COL_SUGGESTION_ID);
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163 preference = (int)strtol(PQgetvalue(res, i, COL_PREFERENCE), (char **)NULL, 10);
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164 if (preference < 1 || preference > 4) {
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165 fprintf(stderr, "Unexpected preference value\n");
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166 abort();
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167 }
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168 preference--;
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169 ballot->sections[preference].candidates[candidates_in_sections[preference]++] = candidate_by_key(suggestion_id);
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170 }
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171 if (i==tuple_count || (old_member_id && strcmp(old_member_id, member_id))) {
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172 ballot++;
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173 candidates_in_sections[0] = 0;
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174 candidates_in_sections[1] = 0;
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175 candidates_in_sections[2] = 0;
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176 candidates_in_sections[3] = 0;
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177 }
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178 old_member_id = member_id;
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179 }
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180 }
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181
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182 free(candidates);
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183 for (i=0; i<ballot_count; i++) {
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184 int j;
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185 for (j=0; j<4; j++) {
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186 if (ballots[i].sections[j].count) {
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187 free(ballots[i].sections[j].candidates);
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188 }
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189 }
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190 }
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191 free(ballots);
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192 }
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193
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194 int main(int argc, char **argv) {
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195
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196 // variable declarations:
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197 int err = 0;
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198 int i, count;
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199 char *conninfo;
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200 PGconn *db;
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201 PGresult *res;
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202
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203 // parse command line:
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204 if (argc == 0) return 1;
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205 if (argc == 1 || !strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")) {
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206 FILE *out;
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207 out = argc == 1 ? stderr : stdout;
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208 fprintf(stdout, "\n");
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209 fprintf(stdout, "Usage: %s <conninfo>\n", argv[0]);
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210 fprintf(stdout, "\n");
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211 fprintf(stdout, "<conninfo> is specified by PostgreSQL's libpq,\n");
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212 fprintf(stdout, "see http://www.postgresql.org/docs/9.1/static/libpq-connect.html\n");
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213 fprintf(stdout, "\n");
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214 fprintf(stdout, "Example: %s dbname=liquid_feedback\n", argv[0]);
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215 fprintf(stdout, "\n");
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216 return argc == 1 ? 1 : 0;
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217 }
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218 {
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219 size_t len = 0;
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220 for (i=1; i<argc; i++) len += strlen(argv[i]) + 1;
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221 conninfo = malloc(len * sizeof(char));
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222 if (!conninfo) {
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223 fprintf(stderr, "Error: Could not allocate memory for conninfo string\n");
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224 return 1;
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225 }
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226 conninfo[0] = 0;
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227 for (i=1; i<argc; i++) {
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228 if (i>1) strcat(conninfo, " ");
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229 strcat(conninfo, argv[i]);
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230 }
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231 }
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232
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233 // connect to database:
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234 db = PQconnectdb(conninfo);
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235 if (!db) {
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236 fprintf(stderr, "Error: Could not create database handle\n");
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237 return 1;
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238 }
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239 if (PQstatus(db) != CONNECTION_OK) {
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240 fprintf(stderr, "Could not open connection:\n%s", PQerrorMessage(db));
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241 return 1;
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242 }
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243
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244 // check initiatives:
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245 res = PQexec(db, "SELECT \"initiative_id\", \"final\" FROM \"initiative_suggestion_order_calculation\"");
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246 if (!res) {
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247 fprintf(stderr, "Error in pqlib while sending SQL command selecting open issues\n");
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248 err = 1;
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249 } else if (PQresultStatus(res) != PGRES_TUPLES_OK) {
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250 fprintf(stderr, "Error while executing SQL command selecting open issues:\n%s", PQresultErrorMessage(res));
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251 err = 1;
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252 PQclear(res);
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253 } else {
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254 count = PQntuples(res);
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255 printf("Number of initiatives to process: %i\n", count);
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256 for (i=0; i<count; i++) {
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257 char *initiative_id, *escaped_initiative_id;
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258 char *cmd;
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259 PGresult *res2;
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260 initiative_id = PQgetvalue(res, i, 0);
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261 printf("Processing initiative_id: %s\n", initiative_id);
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262 escaped_initiative_id = escapeLiteral(db, initiative_id, strlen(initiative_id));
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263 if (asprintf(&cmd, "SELECT \"member_id\", \"weight\", \"preference\", \"suggestion_id\" FROM \"individual_suggestion_ranking\" WHERE \"initiative_id\" = %s ORDER BY \"member_id\", \"preference\"", escaped_initiative_id) < 0) {
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264 fprintf(stderr, "Could not prepare query string in memory.\n");
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265 abort();
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266 }
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267 res2 = PQexec(db, cmd);
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268 free(cmd);
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269 if (!res2) {
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270 fprintf(stderr, "Error in pqlib while sending SQL command selecting open issues\n");
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271 err = 1;
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272 } else if (PQresultStatus(res2) != PGRES_TUPLES_OK) {
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273 fprintf(stderr, "Error while executing SQL command selecting open issues:\n%s", PQresultErrorMessage(res));
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274 err = 1;
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275 PQclear(res2);
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276 } else {
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277 if (PQntuples(res2) == 0) {
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278 printf("Nothing to do.\n");
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279 } else {
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280 process_initiative(res2);
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281 }
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282 PQclear(res2);
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283 }
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284 freemem(escaped_initiative_id);
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285 }
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286 PQclear(res);
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287 }
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288
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289 // cleanup and exit
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290 PQfinish(db);
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291 return err;
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292
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293 }
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