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<td width="35%" class="headerValue"><a href="../index.html">top level</a> - <a href="index.html">libc</a> - time.c<span style="font-size: 80%;"> (source / <a href="time.c.func-sort-c.html">functions</a>)</span></td>
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<td class="headerValue">skiboot.info</td>
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<td class="headerItem">Lines:</td>
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<td class="headerCovTableEntry">66</td>
<td class="headerCovTableEntryHi">100.0 %</td>
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<td class="headerItem">Date:</td>
<td class="headerValue">2023-03-28 15:19:00</td>
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<td class="headerCovTableEntry">5</td>
<td class="headerCovTableEntry">5</td>
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<pre class="sourceHeading"> Branch data Line data Source code</pre>
<pre class="source">
<a name="1"><span class="lineNum"> 1 </span> : : #include <stdbool.h></a>
<a name="2"><span class="lineNum"> 2 </span> : : #include <time.h></a>
<a name="3"><span class="lineNum"> 3 </span> : : </a>
<a name="4"><span class="lineNum"> 4 </span> : : /*</a>
<a name="5"><span class="lineNum"> 5 </span> : : * Returns the number of leap years prior to the given year.</a>
<a name="6"><span class="lineNum"> 6 </span> : : */</a>
<a name="7"><span class="lineNum"> 7 </span> :<span class="lineCov"> 320 : static int leap_years(int year)</span></a>
<a name="8"><span class="lineNum"> 8 </span> : : {</a>
<a name="9"><span class="lineNum"> 9 </span> :<span class="lineCov"> 320 : return (year-1)/4 + (year-1)/400 - (year-1)/100;</span></a>
<a name="10"><span class="lineNum"> 10 </span> : : }</a>
<a name="11"><span class="lineNum"> 11 </span> : : </a>
<a name="12"><span class="lineNum"> 12 </span> :<span class="lineCov"> 765 : static int is_leap_year(int year)</span></a>
<a name="13"><span class="lineNum"> 13 </span> : : {</a>
<a name="14"><span class="lineNum"> 14 </span> :<span class="lineCov"> 765 : return ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);</span></a>
<a name="15"><span class="lineNum"> 15 </span> : : }</a>
<a name="16"><span class="lineNum"> 16 </span> : : </a>
<a name="17"><span class="lineNum"> 17 </span> :<span class="lineCov"> 145 : static int days_in_month(int month, int year)</span></a>
<a name="18"><span class="lineNum"> 18 </span> : : {</a>
<a name="19"><span class="lineNum"> 19 </span> : : static char month_days[] = {</a>
<a name="20"><span class="lineNum"> 20 </span> : : 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31,</a>
<a name="21"><span class="lineNum"> 21 </span> : : };</a>
<a name="22"><span class="lineNum"> 22 </span> : : </a>
<a name="23"><span class="lineNum"> 23 </span> : : /* we may need to update this in the year 4000, pending a</a>
<a name="24"><span class="lineNum"> 24 </span> : : * decision on whether or not it's a leap year */</a>
<a name="25"><span class="lineNum"> 25 </span> :<span class="lineCov"> 145 : if (month == 1)</span></a>
<a name="26"><span class="lineNum"> 26 </span> :<span class="lineCov"> 15 : return is_leap_year(year) ? 29 : 28;</span></a>
<a name="27"><span class="lineNum"> 27 </span> : : </a>
<a name="28"><span class="lineNum"> 28 </span> :<span class="lineCov"> 130 : return month_days[month];</span></a>
<a name="29"><span class="lineNum"> 29 </span> : : }</a>
<a name="30"><span class="lineNum"> 30 </span> : : </a>
<a name="31"><span class="lineNum"> 31 </span> : : static const int days_per_month[2][13] =</a>
<a name="32"><span class="lineNum"> 32 </span> : : {{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},</a>
<a name="33"><span class="lineNum"> 33 </span> : : {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}};</a>
<a name="34"><span class="lineNum"> 34 </span> : : </a>
<a name="35"><span class="lineNum"> 35 </span> : : #define SECS_PER_MIN 60</a>
<a name="36"><span class="lineNum"> 36 </span> : : #define SECS_PER_HOUR (SECS_PER_MIN*60)</a>
<a name="37"><span class="lineNum"> 37 </span> : : #define SECS_PER_DAY (24*SECS_PER_HOUR)</a>
<a name="38"><span class="lineNum"> 38 </span> : : #define DAYS_PER_YEAR 365</a>
<a name="39"><span class="lineNum"> 39 </span> :<span class="lineCov"> 75 : struct tm *gmtime_r(const time_t *timep, struct tm *result)</span></a>
<a name="40"><span class="lineNum"> 40 </span> : : {</a>
<a name="41"><span class="lineNum"> 41 </span> : : int i;</a>
<a name="42"><span class="lineNum"> 42 </span> : : int Y;</a>
<a name="43"><span class="lineNum"> 43 </span> : : int M;</a>
<a name="44"><span class="lineNum"> 44 </span> : : int D;</a>
<a name="45"><span class="lineNum"> 45 </span> : : int h;</a>
<a name="46"><span class="lineNum"> 46 </span> : : int m;</a>
<a name="47"><span class="lineNum"> 47 </span> : : int s;</a>
<a name="48"><span class="lineNum"> 48 </span> : : </a>
<a name="49"><span class="lineNum"> 49 </span> :<span class="lineCov"> 75 : D = *timep / SECS_PER_DAY;</span></a>
<a name="50"><span class="lineNum"> 50 </span> :<span class="lineCov"> 75 : s = *timep % SECS_PER_DAY;</span></a>
<a name="51"><span class="lineNum"> 51 </span> :<span class="lineCov"> 75 : m = s / 60;</span></a>
<a name="52"><span class="lineNum"> 52 </span> :<span class="lineCov"> 75 : h = m / 60;</span></a>
<a name="53"><span class="lineNum"> 53 </span> :<span class="lineCov"> 75 : m %= 60;</span></a>
<a name="54"><span class="lineNum"> 54 </span> :<span class="lineCov"> 75 : s %= 60;</span></a>
<a name="55"><span class="lineNum"> 55 </span> : : </a>
<a name="56"><span class="lineNum"> 56 </span> : : /*</a>
<a name="57"><span class="lineNum"> 57 </span> : : * Work out the year. We subtract one day for every four years</a>
<a name="58"><span class="lineNum"> 58 </span> : : * and every 400 years after 1969. However as leap years don't</a>
<a name="59"><span class="lineNum"> 59 </span> : : * occur every 100 years we add one day back to counteract the</a>
<a name="60"><span class="lineNum"> 60 </span> : : * the subtraction for every 4 years.</a>
<a name="61"><span class="lineNum"> 61 </span> : : */</a>
<a name="62"><span class="lineNum"> 62 </span> :<span class="lineCov"> 75 : Y = (D - (1+D/365)/4 + (69+D/365)/100 - (369+D/365)/400)/365;</span></a>
<a name="63"><span class="lineNum"> 63 </span> : : </a>
<a name="64"><span class="lineNum"> 64 </span> : : /*</a>
<a name="65"><span class="lineNum"> 65 </span> : : * Remember we're doing integer arithmetic here so</a>
<a name="66"><span class="lineNum"> 66 </span> : : * leap_years(Y+1970) - leap_years(1970) != leap_years(Y)</a>
<a name="67"><span class="lineNum"> 67 </span> : : */</a>
<a name="68"><span class="lineNum"> 68 </span> :<span class="lineCov"> 75 : D = D - Y*365 - (leap_years(Y+1970) - leap_years(1970)) + 1;</span></a>
<a name="69"><span class="lineNum"> 69 </span> :<span class="lineCov"> 75 : Y += 1970;</span></a>
<a name="70"><span class="lineNum"> 70 </span> : : </a>
<a name="71"><span class="lineNum"> 71 </span> :<span class="lineCov"> 75 : M = 0;</span></a>
<a name="72"><span class="lineNum"> 72 </span> :<span class="lineCov"> 590 : for (i = 0; i < 13; i++)</span></a>
<a name="73"><span class="lineNum"> 73 </span> :<span class="lineCov"> 590 : if (D <= days_per_month[is_leap_year(Y) ? 1 : 0][i]) {</span></a>
<a name="74"><span class="lineNum"> 74 </span> :<span class="lineCov"> 75 : M = i;</span></a>
<a name="75"><span class="lineNum"> 75 </span> :<span class="lineCov"> 75 : break;</span></a>
<a name="76"><span class="lineNum"> 76 </span> : : }</a>
<a name="77"><span class="lineNum"> 77 </span> : : </a>
<a name="78"><span class="lineNum"> 78 </span> :<span class="lineCov"> 75 : D -= days_per_month[is_leap_year(Y)][M-1];</span></a>
<a name="79"><span class="lineNum"> 79 </span> :<span class="lineCov"> 75 : result->tm_year = Y;</span></a>
<a name="80"><span class="lineNum"> 80 </span> :<span class="lineCov"> 75 : result->tm_mon = M - 1;</span></a>
<a name="81"><span class="lineNum"> 81 </span> :<span class="lineCov"> 75 : result->tm_mday = D;</span></a>
<a name="82"><span class="lineNum"> 82 </span> :<span class="lineCov"> 75 : result->tm_hour = h;</span></a>
<a name="83"><span class="lineNum"> 83 </span> :<span class="lineCov"> 75 : result->tm_min = m;</span></a>
<a name="84"><span class="lineNum"> 84 </span> :<span class="lineCov"> 75 : result->tm_sec = s;</span></a>
<a name="85"><span class="lineNum"> 85 </span> :<span class="lineCov"> 75 : return result;</span></a>
<a name="86"><span class="lineNum"> 86 </span> : : }</a>
<a name="87"><span class="lineNum"> 87 </span> : : </a>
<a name="88"><span class="lineNum"> 88 </span> :<span class="lineCov"> 85 : time_t mktime(struct tm *tm)</span></a>
<a name="89"><span class="lineNum"> 89 </span> : : {</a>
<a name="90"><span class="lineNum"> 90 </span> : : unsigned long year, month, mday, hour, minute, second, d;</a>
<a name="91"><span class="lineNum"> 91 </span> : : static const unsigned long sec_in_400_years =</a>
<a name="92"><span class="lineNum"> 92 </span> : : ((3903ul * 365) + (97 * 366)) * 24 * 60 * 60;</a>
<a name="93"><span class="lineNum"> 93 </span> : : </a>
<a name="94"><span class="lineNum"> 94 </span> :<span class="lineCov"> 85 : second = tm->tm_sec;</span></a>
<a name="95"><span class="lineNum"> 95 </span> :<span class="lineCov"> 85 : minute = tm->tm_min;</span></a>
<a name="96"><span class="lineNum"> 96 </span> :<span class="lineCov"> 85 : hour = tm->tm_hour;</span></a>
<a name="97"><span class="lineNum"> 97 </span> :<span class="lineCov"> 85 : mday = tm->tm_mday;</span></a>
<a name="98"><span class="lineNum"> 98 </span> :<span class="lineCov"> 85 : month = tm->tm_mon;</span></a>
<a name="99"><span class="lineNum"> 99 </span> :<span class="lineCov"> 85 : year = tm->tm_year;</span></a>
<a name="100"><span class="lineNum"> 100 </span> : : </a>
<a name="101"><span class="lineNum"> 101 </span> : : /* There are the same number of seconds in any 400-year block; this</a>
<a name="102"><span class="lineNum"> 102 </span> : : * limits the iterations in the loop below */</a>
<a name="103"><span class="lineNum"> 103 </span> :<span class="lineCov"> 85 : year += 400 * (second / sec_in_400_years);</span></a>
<a name="104"><span class="lineNum"> 104 </span> :<span class="lineCov"> 85 : second = second % sec_in_400_years;</span></a>
<a name="105"><span class="lineNum"> 105 </span> : : </a>
<a name="106"><span class="lineNum"> 106 </span> :<span class="lineCov"> 85 : if (second >= 60) {</span></a>
<a name="107"><span class="lineNum"> 107 </span> :<span class="lineCov"> 10 : minute += second / 60;</span></a>
<a name="108"><span class="lineNum"> 108 </span> :<span class="lineCov"> 10 : second = second % 60;</span></a>
<a name="109"><span class="lineNum"> 109 </span> : : }</a>
<a name="110"><span class="lineNum"> 110 </span> : : </a>
<a name="111"><span class="lineNum"> 111 </span> :<span class="lineCov"> 85 : if (minute >= 60) {</span></a>
<a name="112"><span class="lineNum"> 112 </span> :<span class="lineCov"> 5 : hour += minute / 60;</span></a>
<a name="113"><span class="lineNum"> 113 </span> :<span class="lineCov"> 5 : minute = minute % 60;</span></a>
<a name="114"><span class="lineNum"> 114 </span> : : }</a>
<a name="115"><span class="lineNum"> 115 </span> : : </a>
<a name="116"><span class="lineNum"> 116 </span> :<span class="lineCov"> 85 : if (hour >= 24) {</span></a>
<a name="117"><span class="lineNum"> 117 </span> :<span class="lineCov"> 5 : mday += hour / 24;</span></a>
<a name="118"><span class="lineNum"> 118 </span> :<span class="lineCov"> 5 : hour = hour % 24;</span></a>
<a name="119"><span class="lineNum"> 119 </span> : : }</a>
<a name="120"><span class="lineNum"> 120 </span> : : </a>
<a name="121"><span class="lineNum"> 121 </span> :<span class="lineCov"> 145 : for (d = days_in_month(month, year); mday > d;</span></a>
<a name="122"><span class="lineNum"> 122 </span> :<span class="lineCov"> 60 : d = days_in_month(month, year)) {</span></a>
<a name="123"><span class="lineNum"> 123 </span> :<span class="lineCov"> 60 : month++;</span></a>
<a name="124"><span class="lineNum"> 124 </span> :<span class="lineCov"> 60 : if (month > 11) {</span></a>
<a name="125"><span class="lineNum"> 125 </span> :<span class="lineCov"> 5 : month = 0;</span></a>
<a name="126"><span class="lineNum"> 126 </span> :<span class="lineCov"> 5 : year++;</span></a>
<a name="127"><span class="lineNum"> 127 </span> : : }</a>
<a name="128"><span class="lineNum"> 128 </span> :<span class="lineCov"> 60 : mday -= d;</span></a>
<a name="129"><span class="lineNum"> 129 </span> : : }</a>
<a name="130"><span class="lineNum"> 130 </span> : : </a>
<a name="131"><span class="lineNum"> 131 </span> :<span class="lineCov"> 85 : tm->tm_year = year;</span></a>
<a name="132"><span class="lineNum"> 132 </span> :<span class="lineCov"> 85 : tm->tm_mon = month;</span></a>
<a name="133"><span class="lineNum"> 133 </span> :<span class="lineCov"> 85 : tm->tm_mday = mday;</span></a>
<a name="134"><span class="lineNum"> 134 </span> :<span class="lineCov"> 85 : tm->tm_hour = hour;</span></a>
<a name="135"><span class="lineNum"> 135 </span> :<span class="lineCov"> 85 : tm->tm_min = minute;</span></a>
<a name="136"><span class="lineNum"> 136 </span> :<span class="lineCov"> 85 : tm->tm_sec = second;</span></a>
<a name="137"><span class="lineNum"> 137 </span> : : </a>
<a name="138"><span class="lineNum"> 138 </span> :<span class="lineCov"> 85 : d = mday;</span></a>
<a name="139"><span class="lineNum"> 139 </span> :<span class="lineCov"> 85 : d += days_per_month[is_leap_year(year)][month];</span></a>
<a name="140"><span class="lineNum"> 140 </span> :<span class="lineCov"> 85 : d += (year-1970)*DAYS_PER_YEAR + leap_years(year) - leap_years(1970) - 1;</span></a>
<a name="141"><span class="lineNum"> 141 </span> :<span class="lineCov"> 85 : return d*SECS_PER_DAY + hour*SECS_PER_HOUR + minute*SECS_PER_MIN + second;</span></a>
<a name="142"><span class="lineNum"> 142 </span> : : }</a>
</pre>
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