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annotate local-compare.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 * 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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20 #define STAMPSIZE 32 /* size of time stamp to print out */
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22 char *stations [] = {"94852", /* Ballarat airport */
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23 "94863", /* Sheoaks */
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24 "94866"}; /* Melbourne airport */
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26 const int station_count = sizeof (stations) / sizeof (char *);
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28 /* MySQL stuff */
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29 MYSQL *mysql;
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30 MYSQL_RES *mysql_result_BoM;
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31 MYSQL_RES *mysql_result_local;
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32 MYSQL_ROW mysql_row_BoM;
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33 MYSQL_ROW mysql_row_local;
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34 char mysql_querytext [1024]; /* build up queries here */
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36 /* Command line options */
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37 int debug; /* -d */
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38 int verbose; /* -v */
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39
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40 /*
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41 * Temperatures for calculation: two pairs of BoM time and temperature,
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42 * and one time and temperature between them for local.
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43 */
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44 time_t interval_starttime;
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45 float interval_starttemp;
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46 time_t interval_endtime;
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47 float interval_endtemp;
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48 time_t local_time;
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49 float local_temp;
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50 float interval_temp; /* interpolated BoM temperature */
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51 /* barometric pressure stuff */
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52 float interval_startpressure;
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53 float interval_endpressure;
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54 float interval_pressure; /* interpolated BoM pressure */
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55 float local_pressure;
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56
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57 /* XXX get time zone in here */
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58 const int my2k = 946731600; /* difference between UNIX and GNU epochs */
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59 char *startdate_text; /* start date, YYYY-MM-DD */
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60 char *enddate_text; /* and end date (default: 24 hours later) */
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61 /* Same times in struct tm format */
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62 struct tm startdate;
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63 struct tm enddate;
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64 time_t endtime_t;
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65
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66 void usage (char *myname)
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67 {
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68 fprintf (stderr,
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69 "Usage: %s YYYY-MM-DD YYYY-MM-DD [-d] [-v] [station-id] [user] [passwd] [host] [db]\n",
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70 myname);
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71 exit (1);
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72 }
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73
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74 /*
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75 * Make files with comparative data for temperatures.
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76 *
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77 * The remote observations are relatively infrequent, while the local
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78 * observations are frequent. We interpolate the "remote" values linearly to
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79 * estimate the temperature at the time of a local observation, but it doesn't
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80 * make sense to do that for all local observations. Instead, we just take the
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81 * one immediately after the remote observation, then skip to the next remote
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82 * observation.
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83 */
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84 void mktempcompare (char *stationid)
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85 {
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86 char filename [PATH_MAX];
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87 FILE *myfile; /* output file */
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88 int finishing = 0; /* set to exit loop */
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89
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90 /* Create a file name for this comparison */
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91 strcpy (filename, config.comparefile);
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92 strcat (filename, "-");
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93 strcat (filename, stationid);
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94 myfile = fopen (filename, "w");
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95 if (! myfile)
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96 {
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97 syslog (LOG_ERR | LOG_DAEMON,
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98 "Can't open %s: %s (%d)\n",
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99 filename,
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100 strerror (errno),
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101 errno );
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102 exit (1);
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103 }
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104 chmod (filename, 0666); /* let anybody access it */
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105 sprintf (mysql_querytext,
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106 "SELECT unix_timestamp(timestamp(date, time)), outside_temp\n"
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107 "FROM remote_observations\n"
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108 "WHERE station_id = '%s'\n"
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109 " AND date >= '%s'\n"
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110 " AND date <= '%s'\n"
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111 "ORDER BY date, time;\n",
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112 stationid,
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113 startdate_text,
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114 enddate_text );
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115 if (domyquery (mysql_querytext, &mysql_result_BoM))
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116 exit (1); /* failed and reported */
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117 if (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM)) /* got something */
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118 {
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119 interval_starttime = atol (mysql_row_BoM [0]);
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120 interval_starttemp = atof (mysql_row_BoM [1]);
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121 /* Next row for first interval */
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122 if (! (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM))) /* got something ?*/
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diff changeset
123 exit (1); /* no */
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124 interval_endtime = atol (mysql_row_BoM [0]);
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125 interval_endtemp = atof (mysql_row_BoM [1]);
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126
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127 /*
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128 * Now we have an initial interval. Get the first local record after start
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129 * of interval.
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130 */
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131 sprintf (mysql_querytext,
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132 "SELECT unix_timestamp(timestamp(date, time)), outside_temp\n"
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133 "FROM %s\n"
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134 "WHERE station_id = '%s'\n"
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135 " AND date >= '%s'\n"
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136 " AND date <= '%s'\n"
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137 "ORDER BY date, time;\n",
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138 config.db_table,
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139 config.station_id,
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140 startdate_text,
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141 enddate_text );
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142 if (domyquery (mysql_querytext, &mysql_result_local))
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143 exit (1); /* failed and reported */
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144 while (mysql_row_local = mysql_fetch_row (mysql_result_local)) /* got something */
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145 {
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146 local_time = atol (mysql_row_local [0]);
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147 local_temp = atof (mysql_row_local [1]);
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148 if (local_time > interval_starttime) /* we're in business */
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149 {
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150 while (local_time > interval_endtime) /* beyond current BoM readings */
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151 {
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152 interval_starttime = interval_endtime;
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153 interval_starttemp = interval_endtemp;
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154 /* Next row for first interval */
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155 if (! (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM))) /* finished? */
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156 {
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157 fclose (myfile);
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158 return;
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159 }
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160 interval_endtime = atol (mysql_row_BoM [0]);
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161 interval_endtemp = atof (mysql_row_BoM [1]);
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162 }
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163
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164 /*
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165 * Now our local reading is between start and end times. Interpolate
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166 * to get BoM temperature at this time.
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167 */
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168 interval_temp = interval_starttemp
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169 + (interval_endtemp - interval_starttemp)
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170 * (local_time - interval_starttime) / (interval_endtime - interval_starttime);
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171 fprintf (myfile,
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172 "%d %d %2.1f %2.1f %2.1f # %s",
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173 local_time,
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diff changeset
174 local_time - my2k,
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diff changeset
175 local_temp,
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diff changeset
176 interval_temp,
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diff changeset
177 interval_temp - local_temp,
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diff changeset
178 ctime (&local_time) );
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179
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180 if (finishing)
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diff changeset
181 {
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diff changeset
182 fclose (myfile);
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diff changeset
183 return;
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184 }
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185 /* Next remote row */
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diff changeset
186 interval_starttime = interval_endtime;
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diff changeset
187 interval_starttemp = interval_endtemp;
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diff changeset
188 if (! (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM))) /* finished? */
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189 finishing = 1;
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diff changeset
190 else
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diff changeset
191 {
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parents:
diff changeset
192 interval_endtime = atol (mysql_row_BoM [0]);
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193 interval_endtemp = atof (mysql_row_BoM [1]);
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194 }
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195 }
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diff changeset
196 }
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197 }
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198 }
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199
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diff changeset
200 /*
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201 * Make files with comparative data for barometric pressures.
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202 */
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diff changeset
203 void mkpresscompare (char *stationid)
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204 {
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205 char filename [PATH_MAX];
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206 FILE *myfile; /* output file */
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parents:
diff changeset
207 int finishing = 0; /* set to exit loop */
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diff changeset
208
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diff changeset
209 /* Create a file name for this comparison */
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diff changeset
210 strcpy (filename, config.comparefile);
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211 strcat (filename, "-pressure-");
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diff changeset
212 strcat (filename, stationid);
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213 myfile = fopen (filename, "w");
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214 if (! myfile)
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215 {
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diff changeset
216 syslog (LOG_ERR | LOG_DAEMON,
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diff changeset
217 "Can't open %s: %s (%d)\n",
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218 filename,
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219 strerror (errno),
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220 errno );
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diff changeset
221 exit (1);
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222 }
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223 chmod (filename, 0666); /* let anybody access it */
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diff changeset
224 sprintf (mysql_querytext,
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225 "SELECT unix_timestamp(timestamp(date, time)), pressure_msl\n"
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226 "FROM remote_observations\n"
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227 "WHERE station_id = '%s'\n"
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228 " AND date >= '%s'\n"
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229 " AND date <= '%s'\n"
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230 " AND pressure_msl IS NOT NULL\n"
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diff changeset
231 "ORDER BY date, time;\n",
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diff changeset
232 stationid,
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233 startdate_text,
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diff changeset
234 enddate_text );
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235 if (domyquery (mysql_querytext, &mysql_result_BoM))
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236 exit (1); /* failed and reported */
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diff changeset
237 if (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM)) /* got something */
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diff changeset
238 {
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diff changeset
239 interval_starttime = atol (mysql_row_BoM [0]);
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240 interval_startpressure = atof (mysql_row_BoM [1]);
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241
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diff changeset
242 /*
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243 * Next row for first interval.
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244 *
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245 * The BoM doesn't issue this information very frequently, so we'll accept a
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246 * single reading if we have to. In this case, we just pretend that the
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247 * pressure is constant.
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248 */
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diff changeset
249 if (! (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM))) /* got something ?*/
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250 {
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251 finishing = 1; /* no, just do one more result */
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252 interval_endtime = interval_starttime + 100;
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253 interval_endpressure = interval_startpressure;
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254 }
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255 else
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diff changeset
256 {
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diff changeset
257 interval_endtime = atol (mysql_row_BoM [0]);
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258 interval_endpressure = atof (mysql_row_BoM [1]);
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259 }
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260
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261 /*
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262 * Now we have an initial interval. Get the first local record after start
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263 * of interval.
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264 */
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diff changeset
265 sprintf (mysql_querytext,
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266 "SELECT unix_timestamp(timestamp(date, time)), pressure_msl\n"
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267 "FROM %s\n"
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268 "WHERE station_id = '%s'\n"
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269 " AND date >= '%s'\n"
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270 " AND date <= '%s'\n"
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diff changeset
271 " AND pressure_msl IS NOT NULL\n"
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272 "ORDER BY date, time;\n",
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273 config.db_table,
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274 config.station_id,
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275 startdate_text,
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276 enddate_text );
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277 if (domyquery (mysql_querytext, &mysql_result_local))
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278 exit (1); /* failed and reported */
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279 while (mysql_row_local = mysql_fetch_row (mysql_result_local)) /* got something */
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280 {
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diff changeset
281 local_time = atol (mysql_row_local [0]);
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diff changeset
282 local_pressure = atof (mysql_row_local [1]);
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diff changeset
283 if (local_time > interval_starttime) /* we're in business */
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diff changeset
284 {
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diff changeset
285 /*
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parents:
diff changeset
286 * Unlike with temperatures, we only look at the first pressure reading
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parents:
diff changeset
287 * newer than the BoM reading. We have no way of knowing if the BoM has
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diff changeset
288 * similar changes to what we have locally.
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diff changeset
289 */
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diff changeset
290 while (local_time > interval_endtime) /* beyond current BoM readings */
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parents:
diff changeset
291 {
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diff changeset
292 interval_starttime = interval_endtime;
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diff changeset
293 interval_startpressure = interval_endpressure;
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diff changeset
294 /* Next row for first interval */
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parents:
diff changeset
295 if (! (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM))) /* finished? */
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diff changeset
296 {
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diff changeset
297 finishing = 1;
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diff changeset
298 interval_endtime += 1000; /* to avoid division by 0 */
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diff changeset
299 }
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parents:
diff changeset
300 else
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parents:
diff changeset
301 {
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diff changeset
302 interval_endtime = atol (mysql_row_BoM [0]);
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parents:
diff changeset
303 interval_endpressure = atof (mysql_row_BoM [1]);
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diff changeset
304 }
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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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diff changeset
308 * Now our local reading is between start and end times. Interpolate
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parents:
diff changeset
309 * to get BoM pressure at this time.
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diff changeset
310 */
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parents:
diff changeset
311 interval_pressure = interval_startpressure
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parents:
diff changeset
312 + (interval_endpressure - interval_startpressure)
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parents:
diff changeset
313 * (local_time - interval_starttime) / (interval_endtime - interval_starttime);
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diff changeset
314 fprintf (myfile,
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diff changeset
315 "%d %d %2.1f %2.1f %2.1f # %s",
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diff changeset
316 local_time,
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parents:
diff changeset
317 local_time - my2k,
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diff changeset
318 local_pressure,
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parents:
diff changeset
319 interval_pressure,
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parents:
diff changeset
320 interval_pressure - local_pressure,
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parents:
diff changeset
321 ctime (&local_time) );
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parents:
diff changeset
322 local_time = interval_endtime + 1; /* force the next record */
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parents:
diff changeset
323
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parents:
diff changeset
324 if (finishing)
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parents:
diff changeset
325 {
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diff changeset
326 fclose (myfile);
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parents:
diff changeset
327 return;
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diff changeset
328 }
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parents:
diff changeset
329 /* Next remote row */
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parents:
diff changeset
330 interval_starttime = interval_endtime;
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parents:
diff changeset
331 interval_starttemp = interval_endtemp;
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Daniel O'Connor <darius@dons.net.au>
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332 if (! (mysql_row_BoM = mysql_fetch_row (mysql_result_BoM))) /* finished? */
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333 finishing = 1;
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334 else
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335 {
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336 interval_endtime = atol (mysql_row_BoM [0]);
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337 interval_endtemp = atof (mysql_row_BoM [1]);
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338 }
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339 }
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340 }
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341 }
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342 fclose (myfile);
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343 }
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344
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345 int main (int argc, char *argv [])
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346 {
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347 int station;
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348 /*
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349 * This is tacky. We want to use the standard parameter sequence in
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350 * read_config (), but that doesn't include dates. So we require the sequence
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351 * in usage (). And that means that we need to find a way to specify the end
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352 * day. FIXME.
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353 */
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354
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355 if (argc < 3) /* we need at least start date */
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356 usage (argv [0]);
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357 startdate_text = argv [1]; /* start and */
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358 enddate_text = argv [1]; /* end date */
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359 read_config (argc - 2, &argv [2]); /* this implies that we know argv [0] won't be used */
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360
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361 mysql = mysql_init (mysql);
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362 if (! mysql)
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363 {
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364 syslog (LOG_ERR | LOG_DAEMON, "Can't initialize MySQL: insufficient memory\n");
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365 exit (1);
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366 }
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367 if (! mysql_real_connect (mysql, /* DB state */
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368 config.db_host, /* database host */
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369 config.db_user,
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370 config.db_passwd,
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371 config.db,
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372 0,
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373 NULL,
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374 0 ))
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375 {
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376 syslog (LOG_ERR | LOG_DAEMON,
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377 "Can't connect to databaase: %s (%d)\n",
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378 mysql_error (mysql),
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379 mysql_errno (mysql) );
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380 exit (1);
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381 }
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382
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383 /* Generate the files */
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384 for (station = 0; station < station_count; station++)
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385 {
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386 mktempcompare (stations [station]);
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387 mkpresscompare (stations [station]);
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388 }
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389 exit (0);
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390 }