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<h1>tzwrapper.cc</h1><a href="tzwrapper_8cc.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">///</span>
<a name="l00002"></a>00002 <span class="comment"></span><span class="comment">/// \file tzwrapper.cc</span>
<a name="l00003"></a>00003 <span class="comment"></span><span class="comment">/// Timezone adjustment class, wrapping the TZ environment</span>
<a name="l00004"></a>00004 <span class="comment"></span><span class="comment">/// variable to make struct tm -> time_t conversions easier.</span>
<a name="l00005"></a>00005 <span class="comment"></span><span class="comment">///</span>
<a name="l00006"></a>00006 <span class="comment"></span>
<a name="l00007"></a>00007 <span class="comment">/*</span>
<a name="l00008"></a>00008 <span class="comment"> Copyright (C) 2010, Chris Frey <cdfrey@foursquare.net>, To God be the glory</span>
<a name="l00009"></a>00009 <span class="comment"> Released to the public domain.</span>
<a name="l00010"></a>00010 <span class="comment"> Included in Barry and Barrified the namespace July 2010</span>
<a name="l00011"></a>00011 <span class="comment">*/</span>
<a name="l00012"></a>00012
<a name="l00013"></a>00013 <span class="preprocessor">#include "<a class="code" href="tzwrapper_8h.html" title="Timezone adjustment class, wrapping the TZ environment variable to make struct tm...">tzwrapper.h</a>"</span>
<a name="l00014"></a>00014 <span class="preprocessor">#include <string.h></span>
<a name="l00015"></a>00015 <span class="preprocessor">#include <stdio.h></span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="keyword">namespace </span>Barry { <span class="keyword">namespace </span>Sync {
<a name="l00018"></a>00018
<a name="l00019"></a>00019 time_t utc_mktime(<span class="keyword">struct</span> tm *utctime)
<a name="l00020"></a>00020 {
<a name="l00021"></a>00021 time_t result;
<a name="l00022"></a>00022 <span class="keyword">struct </span>tm tmp, check;
<a name="l00023"></a>00023
<a name="l00024"></a>00024 <span class="comment">// loop, converting "local time" to time_t and back to utc tm,</span>
<a name="l00025"></a>00025 <span class="comment">// and adjusting until there are no differences... this</span>
<a name="l00026"></a>00026 <span class="comment">// automatically takes care of DST issues.</span>
<a name="l00027"></a>00027
<a name="l00028"></a>00028 <span class="comment">// do first conversion</span>
<a name="l00029"></a>00029 tmp = *utctime;
<a name="l00030"></a>00030 tmp.tm_isdst = -1;
<a name="l00031"></a>00031 result = mktime(&tmp);
<a name="l00032"></a>00032 <span class="keywordflow">if</span>( result == (time_t)-1 )
<a name="l00033"></a>00033 <span class="keywordflow">return</span> (time_t)-1;
<a name="l00034"></a>00034 <span class="keywordflow">if</span>( gmtime_r(&result, &check) == NULL )
<a name="l00035"></a>00035 <span class="keywordflow">return</span> (time_t)-1;
<a name="l00036"></a>00036
<a name="l00037"></a>00037 <span class="comment">// loop until match</span>
<a name="l00038"></a>00038 <span class="keywordflow">while</span>( check.tm_year != utctime->tm_year ||
<a name="l00039"></a>00039 check.tm_mon != utctime->tm_mon ||
<a name="l00040"></a>00040 check.tm_mday != utctime->tm_mday ||
<a name="l00041"></a>00041 check.tm_hour != utctime->tm_hour ||
<a name="l00042"></a>00042 check.tm_min != utctime->tm_min )
<a name="l00043"></a>00043 {
<a name="l00044"></a>00044 tmp.tm_min += utctime->tm_min - check.tm_min;
<a name="l00045"></a>00045 tmp.tm_hour += utctime->tm_hour - check.tm_hour;
<a name="l00046"></a>00046 tmp.tm_mday += utctime->tm_mday - check.tm_mday;
<a name="l00047"></a>00047 tmp.tm_year += utctime->tm_year - check.tm_year;
<a name="l00048"></a>00048 tmp.tm_isdst = -1;
<a name="l00049"></a>00049
<a name="l00050"></a>00050 result = mktime(&tmp);
<a name="l00051"></a>00051 <span class="keywordflow">if</span>( result == (time_t)-1 )
<a name="l00052"></a>00052 <span class="keywordflow">return</span> (time_t)-1;
<a name="l00053"></a>00053 gmtime_r(&result, &check);
<a name="l00054"></a>00054 <span class="keywordflow">if</span>( gmtime_r(&result, &check) == NULL )
<a name="l00055"></a>00055 <span class="keywordflow">return</span> (time_t)-1;
<a name="l00056"></a>00056 }
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="keywordflow">return</span> result;
<a name="l00059"></a>00059 }
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="keyword">struct </span>tm* iso_to_tm(<span class="keyword">const</span> <span class="keywordtype">char</span> *timestamp,
<a name="l00062"></a>00062 <span class="keyword">struct</span> tm *result,
<a name="l00063"></a>00063 <span class="keywordtype">bool</span> &utc)
<a name="l00064"></a>00064 {
<a name="l00065"></a>00065 memset(result, 0, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> tm));
<a name="l00066"></a>00066 <span class="keywordtype">char</span> zflag = 0;
<a name="l00067"></a>00067
<a name="l00068"></a>00068 <span class="keywordtype">int</span> found = sscanf(timestamp, <span class="stringliteral">"%04d%02d%02dT%02d%02d%02d%c"</span>,
<a name="l00069"></a>00069 &(result->tm_year), &(result->tm_mon), &(result->tm_mday),
<a name="l00070"></a>00070 &(result->tm_hour), &(result->tm_min), &(result->tm_sec),
<a name="l00071"></a>00071 &zflag);
<a name="l00072"></a>00072
<a name="l00073"></a>00073 result->tm_year -= 1900;
<a name="l00074"></a>00074 result->tm_mon -= 1;
<a name="l00075"></a>00075 result->tm_isdst = -1;
<a name="l00076"></a>00076
<a name="l00077"></a>00077 utc = (found == 7 && zflag == <span class="charliteral">'Z'</span>);
<a name="l00078"></a>00078
<a name="l00079"></a>00079 <span class="keywordflow">return</span> (found >= 6) ? result : 0;
<a name="l00080"></a>00080 }
<a name="l00081"></a>00081
<a name="l00082"></a>00082 std::string tm_to_iso(<span class="keyword">const</span> <span class="keyword">struct</span> tm *t, <span class="keywordtype">bool</span> utc)
<a name="l00083"></a>00083 {
<a name="l00084"></a>00084 <span class="keywordtype">char</span> tmp[128];
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="keywordtype">int</span> cc = snprintf(tmp, <span class="keyword">sizeof</span>(tmp), <span class="stringliteral">"%04d%02d%02dT%02d%02d%02d"</span>,
<a name="l00087"></a>00087 t->tm_year + 1900,
<a name="l00088"></a>00088 t->tm_mon + 1,
<a name="l00089"></a>00089 t->tm_mday,
<a name="l00090"></a>00090 t->tm_hour,
<a name="l00091"></a>00091 t->tm_min,
<a name="l00092"></a>00092 t->tm_sec
<a name="l00093"></a>00093 );
<a name="l00094"></a>00094 <span class="keywordflow">if</span>( cc < 0 || (<span class="keywordtype">size_t</span>)cc >= <span class="keyword">sizeof</span>(tmp) )
<a name="l00095"></a>00095 <span class="keywordflow">return</span> <span class="stringliteral">""</span>;
<a name="l00096"></a>00096
<a name="l00097"></a>00097 <span class="keywordflow">if</span>( utc ) {
<a name="l00098"></a>00098 <span class="keywordflow">if</span>( (<span class="keywordtype">size_t</span>)cc >= (<span class="keyword">sizeof</span>(tmp) - 1) )
<a name="l00099"></a>00099 <span class="keywordflow">return</span> <span class="stringliteral">""</span>; <span class="comment">// not enough room for Z</span>
<a name="l00100"></a>00100 tmp[cc++] = <span class="charliteral">'Z'</span>;
<a name="l00101"></a>00101 tmp[cc] = 0;
<a name="l00102"></a>00102 }
<a name="l00103"></a>00103
<a name="l00104"></a>00104 <span class="keywordflow">return</span> tmp;
<a name="l00105"></a>00105 }
<a name="l00106"></a>00106
<a name="l00107"></a><a class="code" href="classBarry_1_1Sync_1_1TzWrapper.html#ac1524071e5a61fa789331c9784b6093d">00107</a> time_t <a class="code" href="classBarry_1_1Sync_1_1TzWrapper.html#ac1524071e5a61fa789331c9784b6093d" title="Converts an ISO timestamp (YYYYMMDDTHHMMWW[Z]) into a unix time_t.">TzWrapper::iso_mktime</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *timestamp)
<a name="l00108"></a>00108 {
<a name="l00109"></a>00109 <span class="keywordtype">bool</span> utc;
<a name="l00110"></a>00110 <span class="keyword">struct </span>tm t;
<a name="l00111"></a>00111 <span class="keywordflow">if</span>( !iso_to_tm(timestamp, &t, utc) )
<a name="l00112"></a>00112 <span class="keywordflow">return</span> (time_t)-1;
<a name="l00113"></a>00113 <a class="code" href="classBarry_1_1Sync_1_1TzWrapper.html" title="Wrapper class for the TZ environment variable.">TzWrapper</a> tzw;
<a name="l00114"></a>00114 <span class="keywordflow">if</span>( utc )
<a name="l00115"></a>00115 tzw.<a class="code" href="classBarry_1_1Sync_1_1TzWrapper.html#aab3349c356c87e37d41841d78fd8f227" title="Set timezone to UTC.">SetUTC</a>();
<a name="l00116"></a>00116 <span class="keywordflow">return</span> tzw.mktime(&t);
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118
<a name="l00119"></a>00119 }} <span class="comment">// namespace Barry::Sync</span>
<a name="l00120"></a>00120
<a name="l00121"></a>00121
<a name="l00122"></a>00122 <span class="preprocessor">#ifdef TZ_TEST_MODE</span>
<a name="l00123"></a>00123 <span class="preprocessor"></span><span class="preprocessor">#include <iostream></span>
<a name="l00124"></a>00124 <span class="keyword">using namespace </span>std;
<a name="l00125"></a>00125 <span class="keyword">using namespace </span>Barry::Sync;
<a name="l00126"></a>00126 <span class="keywordtype">int</span> main()
<a name="l00127"></a>00127 {
<a name="l00128"></a>00128 time_t now = time(NULL);
<a name="l00129"></a>00129
<a name="l00130"></a>00130 cout << <span class="stringliteral">"TZ: "</span> << TzWrapper().ctime(&now);
<a name="l00131"></a>00131 cout << <span class="stringliteral">"UTC: "</span> << TzWrapper(<span class="stringliteral">""</span>).ctime(&now);
<a name="l00132"></a>00132 cout << <span class="stringliteral">"UTC: "</span> << TzWrapper().SetUTC().ctime(&now);
<a name="l00133"></a>00133 cout << <span class="stringliteral">"SysLocaltime: "</span> << TzWrapper().SetUTC().SetSysLocal().ctime(&now);
<a name="l00134"></a>00134 cout << <span class="stringliteral">"TZ: "</span> << TzWrapper().SetUTC().SetDefault().ctime(&now);
<a name="l00135"></a>00135 cout << <span class="stringliteral">"Canada/Eastern: "</span> << TzWrapper(<span class="stringliteral">"Canada/Eastern"</span>).ctime(&now);
<a name="l00136"></a>00136 cout << <span class="stringliteral">"Canada/Pacific: "</span> << TzWrapper(<span class="stringliteral">"Canada/Pacific"</span>).ctime(&now);
<a name="l00137"></a>00137
<a name="l00138"></a>00138 {
<a name="l00139"></a>00139 TzWrapper tzw(<span class="stringliteral">"UTC"</span>);
<a name="l00140"></a>00140 cout << <span class="stringliteral">"UTC: "</span> << ctime(&now);
<a name="l00141"></a>00141 }
<a name="l00142"></a>00142
<a name="l00143"></a>00143 cout << <span class="stringliteral">"TZ: "</span> << ctime(&now);
<a name="l00144"></a>00144
<a name="l00145"></a>00145 <span class="comment">// test iso_mktime()... the test values assume a Canada/Eastern TZ</span>
<a name="l00146"></a>00146 cout << <span class="stringliteral">"Using Canada/Eastern:"</span> << endl;
<a name="l00147"></a>00147 TzWrapper tzw(<span class="stringliteral">"Canada/Eastern"</span>);
<a name="l00148"></a>00148 <span class="keyword">const</span> <span class="keywordtype">char</span> *iso1 = <span class="stringliteral">"20100430T231500"</span>;
<a name="l00149"></a>00149 <span class="keyword">const</span> <span class="keywordtype">char</span> *iso2 = <span class="stringliteral">"20100501T031500Z"</span>;
<a name="l00150"></a>00150 time_t t1 = TzWrapper::iso_mktime(iso1);
<a name="l00151"></a>00151 time_t t2 = TzWrapper::iso_mktime(iso2);
<a name="l00152"></a>00152 cout << <span class="stringliteral">" "</span> << iso1 << <span class="stringliteral">": ("</span> << t1 << <span class="stringliteral">") "</span> << ctime(&t1);
<a name="l00153"></a>00153 cout << iso2 << <span class="stringliteral">": ("</span> << t2 << <span class="stringliteral">") "</span> << ctime(&t2);
<a name="l00154"></a>00154
<a name="l00155"></a>00155 <span class="keywordflow">if</span>( TzWrapper::iso_mktime(<span class="stringliteral">"20100430"</span>) == (time_t)-1 )
<a name="l00156"></a>00156 cout << <span class="stringliteral">"Fail check: passed"</span> << endl;
<a name="l00157"></a>00157 <span class="keywordflow">else</span>
<a name="l00158"></a>00158 cout << <span class="stringliteral">"Fail check: ERROR"</span> << endl;
<a name="l00159"></a>00159
<a name="l00160"></a>00160 cout << <span class="stringliteral">"t1: "</span> << tm_to_iso(gmtime(&t1), <span class="keyword">true</span>) << endl;
<a name="l00161"></a>00161 }
<a name="l00162"></a>00162 <span class="preprocessor">#endif</span>
<a name="l00163"></a>00163 <span class="preprocessor"></span>
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