Mercurial > ~darius > hgwebdir.cgi > wh1080

annotate local-compare.c @ 4:f561c7f130a0

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Make -n not do any DB stuff so we don't need to #if the MySQL stuff out.
author Daniel O'Connor <darius@dons.net.au>
date Thu, 11 Feb 2010 11:47:11 +1030
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children
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1 /*
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2 * Create text files with a table comparing local temperature and barometric
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3 * pressurs to remote observations.
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4 *
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5 * Format:
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6 *
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7 * Date Difference # legible date
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8 *
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9 * Greg Lehey, 17 December 2009
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10 *
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11 * FIXME. This needs rethinking. In particular, startup parameters are a mess.
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12 * Read on, brave programmer.
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13 *
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14 * $Id: local-compare.c,v 1.5 2010/02/07 03:38:26 grog Exp $
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15 */
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17 #include "wh1080.h"
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18 #include <syslog.h>
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19 #include <stdlib.h>
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21 #define STAMPSIZE 32 /* size of time stamp to print out */
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23 char *stations [] = {"94852", /* Ballarat airport */
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24 "94863", /* Sheoaks */
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25 "94866"}; /* Melbourne airport */
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27 const int station_count = sizeof (stations) / sizeof (char *);
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29 /* MySQL stuff */
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30 MYSQL *mysql;
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31 MYSQL_RES *mysql_result_BoM;
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32 MYSQL_RES *mysql_result_local;
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33 MYSQL_ROW mysql_row_BoM;
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34 MYSQL_ROW mysql_row_local;
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35 char mysql_querytext [1024]; /* build up queries here */
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37 /* Command line options */
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38 int debug; /* -d */
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39 int verbose; /* -v */
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41 /*
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42 * Temperatures for calculation: two pairs of BoM time and temperature,
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43 * and one time and temperature between them for local.
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44 */
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45 time_t interval_starttime;
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46 float interval_starttemp;
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47 time_t interval_endtime;
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48 float interval_endtemp;
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49 time_t local_time;
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50 float local_temp;
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51 float interval_temp; /* interpolated BoM temperature */
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52 /* barometric pressure stuff */
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53 float interval_startpressure;
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54 float interval_endpressure;
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55 float interval_pressure; /* interpolated BoM pressure */
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56 float local_pressure;
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57
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58 /* XXX get time zone in here */
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59 const int my2k = 946731600; /* difference between UNIX and GNU epochs */
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60 char *startdate_text; /* start date, YYYY-MM-DD */
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61 char *enddate_text; /* and end date (default: 24 hours later) */
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62 /* Same times in struct tm format */
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63 struct tm startdate;
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64 struct tm enddate;
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65 time_t endtime_t;
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66
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67 void usage (char *myname)
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68 {
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69 fprintf (stderr,
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70 "Usage: %s YYYY-MM-DD YYYY-MM-DD [-d] [-v] [station-id] [user] [passwd] [host] [db]\n",
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71 myname);
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72 exit (1);
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73 }
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74
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75 /*
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76 * Make files with comparative data for temperatures.
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77 *
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78 * The remote observations are relatively infrequent, while the local
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79 * observations are frequent. We interpolate the "remote" values linearly to
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80 * estimate the temperature at the time of a local observation, but it doesn't
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81 * make sense to do that for all local observations. Instead, we just take the
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82 * one immediately after the remote observation, then skip to the next remote
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83 * observation.
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84 */
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85 void mktempcompare (char *stationid)
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86 {
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87 char filename [PATH_MAX];
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88 FILE *myfile; /* output file */
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89 int finishing = 0; /* set to exit loop */
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90
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91 /* Create a file name for this comparison */
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92 strcpy (filename, config.comparefile);
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93 strcat (filename, "-");
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94 strcat (filename, stationid);
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95 myfile = fopen (filename, "w");
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96 if (! myfile)
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97 {
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98 syslog (LOG_ERR | LOG_DAEMON,
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99 "Can't open %s: %s (%d)\n",
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100 filename,
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101 strerror (errno),
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102 errno );
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103 exit (1);
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104 }
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105 chmod (filename, 0666); /* let anybody access it */
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106 sprintf (mysql_querytext,
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107 "SELECT unix_timestamp(timestamp(date, time)), outside_temp\n"
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108 "FROM remote_observations\n"
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109 "WHERE station_id = '%s'\n"
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110 " AND date >= '%s'\n"
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111 " AND date <= '%s'\n"
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112 "ORDER BY date, time;\n",
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113 stationid,
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114 startdate_text,
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115 enddate_text );
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116 if (domyquery (mysql_querytext, &mysql_result_BoM))
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117 exit (1); /* failed and reported */
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118 if (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM)) /* got something */
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119 {
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120 interval_starttime = atol (mysql_row_BoM [0]);
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121 interval_starttemp = atof (mysql_row_BoM [1]);
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122 /* Next row for first interval */
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123 if (! (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM))) /* got something ?*/
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124 exit (1); /* no */
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125 interval_endtime = atol (mysql_row_BoM [0]);
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126 interval_endtemp = atof (mysql_row_BoM [1]);
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127
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128 /*
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129 * Now we have an initial interval. Get the first local record after start
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130 * of interval.
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131 */
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132 sprintf (mysql_querytext,
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133 "SELECT unix_timestamp(timestamp(date, time)), outside_temp\n"
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134 "FROM %s\n"
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135 "WHERE station_id = '%s'\n"
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136 " AND date >= '%s'\n"
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137 " AND date <= '%s'\n"
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138 "ORDER BY date, time;\n",
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139 config.db_table,
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140 config.station_id,
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141 startdate_text,
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142 enddate_text );
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143 if (domyquery (mysql_querytext, &mysql_result_local))
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144 exit (1); /* failed and reported */
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145 while (mysql_row_local = mysql_fetch_row (mysql_result_local)) /* got something */
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146 {
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147 local_time = atol (mysql_row_local [0]);
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148 local_temp = atof (mysql_row_local [1]);
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149 if (local_time > interval_starttime) /* we're in business */
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150 {
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151 while (local_time > interval_endtime) /* beyond current BoM readings */
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152 {
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153 interval_starttime = interval_endtime;
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154 interval_starttemp = interval_endtemp;
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155 /* Next row for first interval */
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156 if (! (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM))) /* finished? */
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157 {
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158 fclose (myfile);
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159 return;
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160 }
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161 interval_endtime = atol (mysql_row_BoM [0]);
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162 interval_endtemp = atof (mysql_row_BoM [1]);
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163 }
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164
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165 /*
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166 * Now our local reading is between start and end times. Interpolate
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167 * to get BoM temperature at this time.
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168 */
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169 interval_temp = interval_starttemp
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170 + (interval_endtemp - interval_starttemp)
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171 * (local_time - interval_starttime) / (interval_endtime - interval_starttime);
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172 fprintf (myfile,
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173 "%d %d %2.1f %2.1f %2.1f # %s",
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174 local_time,
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175 local_time - my2k,
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176 local_temp,
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177 interval_temp,
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178 interval_temp - local_temp,
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179 ctime (&local_time) );
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180
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181 if (finishing)
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182 {
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183 fclose (myfile);
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184 return;
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185 }
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186 /* Next remote row */
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187 interval_starttime = interval_endtime;
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188 interval_starttemp = interval_endtemp;
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189 if (! (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM))) /* finished? */
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190 finishing = 1;
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191 else
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diff changeset
192 {
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193 interval_endtime = atol (mysql_row_BoM [0]);
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194 interval_endtemp = atof (mysql_row_BoM [1]);
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195 }
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196 }
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197 }
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198 }
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199 }
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200
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201 /*
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202 * Make files with comparative data for barometric pressures.
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203 */
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204 void mkpresscompare (char *stationid)
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205 {
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206 char filename [PATH_MAX];
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207 FILE *myfile; /* output file */
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diff changeset
208 int finishing = 0; /* set to exit loop */
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209
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210 /* Create a file name for this comparison */
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211 strcpy (filename, config.comparefile);
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212 strcat (filename, "-pressure-");
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213 strcat (filename, stationid);
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214 myfile = fopen (filename, "w");
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215 if (! myfile)
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216 {
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217 syslog (LOG_ERR | LOG_DAEMON,
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218 "Can't open %s: %s (%d)\n",
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219 filename,
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220 strerror (errno),
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221 errno );
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222 exit (1);
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223 }
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224 chmod (filename, 0666); /* let anybody access it */
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diff changeset
225 sprintf (mysql_querytext,
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226 "SELECT unix_timestamp(timestamp(date, time)), pressure_msl\n"
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227 "FROM remote_observations\n"
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228 "WHERE station_id = '%s'\n"
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229 " AND date >= '%s'\n"
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230 " AND date <= '%s'\n"
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parents:
diff changeset
231 " AND pressure_msl IS NOT NULL\n"
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diff changeset
232 "ORDER BY date, time;\n",
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diff changeset
233 stationid,
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234 startdate_text,
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diff changeset
235 enddate_text );
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diff changeset
236 if (domyquery (mysql_querytext, &mysql_result_BoM))
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diff changeset
237 exit (1); /* failed and reported */
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diff changeset
238 if (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM)) /* got something */
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diff changeset
239 {
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diff changeset
240 interval_starttime = atol (mysql_row_BoM [0]);
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diff changeset
241 interval_startpressure = atof (mysql_row_BoM [1]);
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242
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diff changeset
243 /*
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244 * Next row for first interval.
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245 *
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246 * The BoM doesn't issue this information very frequently, so we'll accept a
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247 * single reading if we have to. In this case, we just pretend that the
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248 * pressure is constant.
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249 */
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diff changeset
250 if (! (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM))) /* got something ?*/
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diff changeset
251 {
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252 finishing = 1; /* no, just do one more result */
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253 interval_endtime = interval_starttime + 100;
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diff changeset
254 interval_endpressure = interval_startpressure;
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255 }
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diff changeset
256 else
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diff changeset
257 {
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diff changeset
258 interval_endtime = atol (mysql_row_BoM [0]);
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diff changeset
259 interval_endpressure = atof (mysql_row_BoM [1]);
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260 }
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261
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diff changeset
262 /*
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263 * Now we have an initial interval. Get the first local record after start
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diff changeset
264 * of interval.
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265 */
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diff changeset
266 sprintf (mysql_querytext,
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diff changeset
267 "SELECT unix_timestamp(timestamp(date, time)), pressure_msl\n"
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268 "FROM %s\n"
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269 "WHERE station_id = '%s'\n"
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270 " AND date >= '%s'\n"
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diff changeset
271 " AND date <= '%s'\n"
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diff changeset
272 " AND pressure_msl IS NOT NULL\n"
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273 "ORDER BY date, time;\n",
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274 config.db_table,
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275 config.station_id,
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276 startdate_text,
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277 enddate_text );
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278 if (domyquery (mysql_querytext, &mysql_result_local))
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279 exit (1); /* failed and reported */
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diff changeset
280 while (mysql_row_local = mysql_fetch_row (mysql_result_local)) /* got something */
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diff changeset
281 {
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diff changeset
282 local_time = atol (mysql_row_local [0]);
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diff changeset
283 local_pressure = atof (mysql_row_local [1]);
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diff changeset
284 if (local_time > interval_starttime) /* we're in business */
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diff changeset
285 {
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parents:
diff changeset
286 /*
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parents:
diff changeset
287 * Unlike with temperatures, we only look at the first pressure reading
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parents:
diff changeset
288 * newer than the BoM reading. We have no way of knowing if the BoM has
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diff changeset
289 * similar changes to what we have locally.
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diff changeset
290 */
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parents:
diff changeset
291 while (local_time > interval_endtime) /* beyond current BoM readings */
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parents:
diff changeset
292 {
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diff changeset
293 interval_starttime = interval_endtime;
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diff changeset
294 interval_startpressure = interval_endpressure;
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parents:
diff changeset
295 /* Next row for first interval */
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parents:
diff changeset
296 if (! (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM))) /* finished? */
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diff changeset
297 {
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diff changeset
298 finishing = 1;
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parents:
diff changeset
299 interval_endtime += 1000; /* to avoid division by 0 */
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diff changeset
300 }
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parents:
diff changeset
301 else
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parents:
diff changeset
302 {
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parents:
diff changeset
303 interval_endtime = atol (mysql_row_BoM [0]);
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parents:
diff changeset
304 interval_endpressure = atof (mysql_row_BoM [1]);
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diff changeset
305 }
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parents:
diff changeset
306 }
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parents:
diff changeset
307
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parents:
diff changeset
308 /*
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diff changeset
309 * Now our local reading is between start and end times. Interpolate
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parents:
diff changeset
310 * to get BoM pressure at this time.
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parents:
diff changeset
311 */
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parents:
diff changeset
312 interval_pressure = interval_startpressure
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parents:
diff changeset
313 + (interval_endpressure - interval_startpressure)
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parents:
diff changeset
314 * (local_time - interval_starttime) / (interval_endtime - interval_starttime);
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diff changeset
315 fprintf (myfile,
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diff changeset
316 "%d %d %2.1f %2.1f %2.1f # %s",
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parents:
diff changeset
317 local_time,
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parents:
diff changeset
318 local_time - my2k,
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parents:
diff changeset
319 local_pressure,
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parents:
diff changeset
320 interval_pressure,
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parents:
diff changeset
321 interval_pressure - local_pressure,
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parents:
diff changeset
322 ctime (&local_time) );
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parents:
diff changeset
323 local_time = interval_endtime + 1; /* force the next record */
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parents:
diff changeset
324
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parents:
diff changeset
325 if (finishing)
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parents:
diff changeset
326 {
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diff changeset
327 fclose (myfile);
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parents:
diff changeset
328 return;
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parents:
diff changeset
329 }
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parents:
diff changeset
330 /* Next remote row */
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parents:
diff changeset
331 interval_starttime = interval_endtime;
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Daniel O'Connor <darius@dons.net.au>
parents:
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332 interval_starttemp = interval_endtemp;
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333 if (! (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM))) /* finished? */
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334 finishing = 1;
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335 else
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336 {
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337 interval_endtime = atol (mysql_row_BoM [0]);
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338 interval_endtemp = atof (mysql_row_BoM [1]);
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339 }
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340 }
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341 }
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342 }
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343 fclose (myfile);
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344 }
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345
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346 int main (int argc, char *argv [])
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347 {
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348 int station;
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349 /*
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350 * This is tacky. We want to use the standard parameter sequence in
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351 * read_config (), but that doesn't include dates. So we require the sequence
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352 * in usage (). And that means that we need to find a way to specify the end
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353 * day. FIXME.
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354 */
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355
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356 if (argc < 3) /* we need at least start date */
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357 usage (argv [0]);
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358 startdate_text = argv [1]; /* start and */
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359 enddate_text = argv [1]; /* end date */
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360 read_config (argc - 2, &argv [2]); /* this implies that we know argv [0] won't be used */
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361
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362 mysql = mysql_init (mysql);
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363 if (! mysql)
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364 {
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365 syslog (LOG_ERR | LOG_DAEMON, "Can't initialize MySQL: insufficient memory\n");
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366 exit (1);
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367 }
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368 if (! mysql_real_connect (mysql, /* DB state */
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369 config.db_host, /* database host */
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370 config.db_user,
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371 config.db_passwd,
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372 config.db,
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373 0,
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374 NULL,
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375 0 ))
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376 {
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377 syslog (LOG_ERR | LOG_DAEMON,
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378 "Can't connect to databaase: %s (%d)\n",
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379 mysql_error (mysql),
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380 mysql_errno (mysql) );
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381 exit (1);
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382 }
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383
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384 /* Generate the files */
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385 for (station = 0; station < station_count; station++)
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386 {
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387 mktempcompare (stations [station]);
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388 mkpresscompare (stations [station]);
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389 }
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390 exit (0);
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391 }