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annotate db.c @ 0:9dab44dcb331

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Initial commit of Greg's code from http://www.lemis.com/grog/tmp/wh1080.tar.gz
author Daniel O'Connor <darius@dons.net.au>
date Tue, 09 Feb 2010 13:44:25 +1030
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children 9da35e705144
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9dab44dcb331 Initial commit of Greg's code from http://www.lemis.com/grog/tmp/wh1080.tar.gz
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1 /*
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2 * Report weather conditions to remote web sites.
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3 * Database access and startup functions.
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4 *
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5 * Greg Lehey, 14 December 2009
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6 *
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7 * $Id: db.c,v 1.5 2010/02/04 03:50:35 grog Exp $
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8 */
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9
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10 #include "wh1080.h"
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11
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12 #define STAMPSIZE 32 /* size of time stamp to print out */
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13
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14 /* Command line options */
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15 int debug; /* -d */
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16 int update = 1; /* -n turns updating off */
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17 int recover = 0; /* -r: recover missed archive data (wh1080 only) */
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18 int verbose; /* -v */
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19 int once; /* -1 */
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20
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21 struct passwd *mypasswd; /* password information for default user */
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22
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23 /* MySQL stuff */
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24 MYSQL *mysql;
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25 MYSQL_RES *mysql_result;
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26 MYSQL_ROW mysql_row;
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27 char mysql_querytext [1024]; /* build up queries here */
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28 struct config config;
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29
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30 void db_login ()
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31 {
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32 if (! mysql_init (mysql))
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33 {
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34 fprintf (stderr, "Can't initialize MySQL\n");
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35 exit (1);
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36 }
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37 mysql = mysql_init (mysql);
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38 if (! mysql)
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39 {
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40 fprintf (stderr, "Can't initialize MySQL: insufficient memory\n");
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41 exit (1);
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42 }
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43 if (! mysql_real_connect (mysql, /* DB state */
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44 config.db_host, /* database host */
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45 config.db_user,
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46 config.db_passwd,
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47 config.db,
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48 0,
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49 NULL,
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50 0 ))
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51 {
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52 fprintf (stderr,
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53 "Can't connect to databaase: %s (%d)\n",
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54 mysql_error (mysql),
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55 mysql_errno (mysql) );
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56 exit (1);
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57 }
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58 }
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59
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60 /*
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61 * Perform a database query, return result to myresult.
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62 */
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63 int domyquery (char *query, MYSQL_RES **myresult)
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64 {
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65 if (mysql_query (mysql, query))
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66 {
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67 fprintf (stderr,
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68 "Can't query database: %s (%d)\n"
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69 " query:%s\n",
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70 mysql_error (mysql),
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71 mysql_errno (mysql),
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72 query );
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73 return 1;
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74 }
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75 *myresult = mysql_store_result (mysql);
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76 return 0;
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77 }
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78
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79 /*
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80 * Perform a database query, return result to implicit mysql_result.
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81 */
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82 int doquery (char *query)
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83 {
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84 return domyquery (query, &mysql_result);
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85 }
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86
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87 /*
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88 * Make a copy of a string in malloced memory and return it.
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89 */
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90 char *mycopy (char *string)
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91 {
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92 char *result = malloc (strlen (string) + 1);
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93 strcpy (result, string);
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94 return result;
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95 }
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96
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97 /*
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98 * Read in config from database.
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99 *
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100 * XXX We have a chicken and egg problem here: the config information includes
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101 * the database name, but we need to know that before we start. For the time
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102 * being we supply necessary information on the command line, with defaults.
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103 * FIXME.
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104 */
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105 int read_config (int argc, char *argv [])
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106 {
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107 int col;
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108 int arg;
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109
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110 for (arg = 1; arg < argc; arg++)
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111 {
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112 if (! strcmp (argv [arg], "-d"))
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113 debug = 1;
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114 else if (! strcmp (argv [arg], "-n")) /* turn off DB updates */
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115 update = 0;
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116 else if (! strcmp (argv [arg], "-v")) /* verbose */
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117 verbose = 1;
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118 else if (! strcmp (argv [arg], "-1")) /* run once and exit */
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119 once = 1;
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120 else
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121 {
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122 if (! config.station_id)
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123 config.station_id = argv [arg];
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124 else if (! config.db_user)
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125 config.db_user = argv [arg];
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126 else if (! config.db_passwd)
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127 config.db_passwd = argv [arg];
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128 else if (! config.db_host)
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129 config.db_host = argv [arg];
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130 else if (! config.db)
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131 config.db = argv [arg];
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132 else
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133 {
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134 fprintf (stderr, "Too many arguments: %s\n", argv [arg]);
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135 return -1;
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136 }
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137 }
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138 }
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139
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140 /* Set default values for config stuff above. */
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141 if (! config.station_id)
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142 config.station_id = "mystation";
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143 if (! config.db_host)
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144 config.db_host = "localhost";
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145 if (! config.db_user)
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146 {
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147 /* Find out user name and use it */
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148 mypasswd = getpwuid (getuid ());
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149 if (mypasswd)
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150 config.db_user = mycopy (mypasswd->pw_name);
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151 else
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152 {
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153 fprintf (stderr, "Can't get default user id\n");
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154 exit (1);
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155 }
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156 }
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157 if (! config.db_passwd)
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158 config.db_passwd = "";
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159 if (! config.db)
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160 config.db = "weather";
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161
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162 if (! mysql_init (mysql))
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163 {
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164 fprintf (stderr, "Can't initialize MySQL\n");
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165 exit (1);
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166 }
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167 mysql = mysql_init (mysql);
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168 if (! mysql)
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169 {
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170 fprintf (stderr, "Can't initialize MySQL: insufficient memory\n");
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171 exit (1);
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172 }
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173 if (! mysql_real_connect (mysql, /* DB state */
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174 config.db_host, /* database host */
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175 config.db_user,
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176 config.db_passwd,
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177 config.db,
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178 0,
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179 NULL,
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180 0 ))
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181 {
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182 fprintf (stderr,
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183 "Can't connect to databaase: %s (%d)\n",
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184 mysql_error (mysql),
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185 mysql_errno (mysql) );
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186 exit (1);
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187 }
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188
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189 /*
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190 * Read the rest of the config from specified database.
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191 */
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192
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193 sprintf (mysql_querytext,
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194 "SELECT version,\n"
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195 " latitude,\n"
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196 " longitude,\n"
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197 " elevation,\n"
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198 " pressure_error,\n"
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199 " poll_interval,\n"
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200 " address,\n"
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201 " wunderground_station_id,\n"
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202 " wunderground_passwd,\n"
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203 " wunderground_report_interval,\n"
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204 " weatheforyou_station_id,\n"
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205 " weatheforyou_passwd,\n"
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206 " weatherforyou_report_interval,\n"
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207 " website_generation_interval,\n"
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208 " db_table,\n"
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209 " php_header,\n"
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210 " comparefile\n"
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211 "FROM config\n"
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212 "WHERE station_id = \"%s\";\n",
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213 config.station_id );
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214 if (doquery (mysql_querytext)) /* failure */
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215 exit (1);
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216
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217 if (! (mysql_row = mysql_fetch_row (mysql_result))) /* got something */
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218 {
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219 fprintf (stderr, "No configuration file found\n");
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220 exit (1);
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221 }
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222
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223 /*
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224 * XXX here we should perform a version check. Do it when we introduce
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225 * version 2.
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226 */
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227 /* And this is filthy ugly. Fix it */
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228 col = 1;
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229 config.latitude = atof (mysql_row [col++]);
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230 config.longitude = atof (mysql_row [col++]);
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231 config.elevation = atof (mysql_row [col++]); /* metres */
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232 config.pressure_error = atof (mysql_row [col++]); /* difference between actual and real pressure, hPa */
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233 config.poll_interval = atoi (mysql_row [col++]); /* time, in seconds, between reading the device */
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234 config.address = mycopy (mysql_row [col++]); /* Address to display on web pages */
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235 config.wunderground_station_id = mycopy (mysql_row [col++]);
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236 config.wunderground_passwd = mycopy (mysql_row [col++]);
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237 config.wunderground_report_interval = atoi (mysql_row [col++]); /* how many seconds between reports to Wunderground */
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238 config.weatheforyou_station_id = mycopy (mysql_row [col++]);
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239 config.weatheforyou_passwd = mycopy (mysql_row [col++]);
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240 config.weatherforyou_report_interval = atoi (mysql_row [col++]); /* how many seconds between reports to Weather for you */
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241 config.website_generation_interval = atoi (mysql_row [col++]); /* how many seconds between generating PHP header file */
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242 config.db_table = mycopy (mysql_row [col++]); /* table */
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243 config.php_header = mycopy (mysql_row [col++]); /* php header file with weather data */
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244 config.comparefile = mycopy (mysql_row [col++]); /* file to compare local weather stations */
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245 return 0; /* success */
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246 }
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247