1 files changed, 37 insertions, 0 deletions

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+#include "util.h"
+
+namespace twitter {
+
+  // Eric S Raymond wrote this
+  /* struct tm to seconds since Unix epoch */
+  time_t timegm(struct tm * t)
+  {
+      long year;
+      time_t result;
+  #define MONTHSPERYEAR   12      /* months per calendar year */
+      static const int cumdays[MONTHSPERYEAR] =
+          { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
+
+      /*@ +matchanyintegral @*/
+      year = 1900 + t->tm_year + t->tm_mon / MONTHSPERYEAR;
+      result = (year - 1970) * 365 + cumdays[t->tm_mon % MONTHSPERYEAR];
+      result += (year - 1968) / 4;
+      result -= (year - 1900) / 100;
+      result += (year - 1600) / 400;
+      if ((year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0) &&
+          (t->tm_mon % MONTHSPERYEAR) < 2)
+          result--;
+      result += t->tm_mday - 1;
+      result *= 24;
+      result += t->tm_hour;
+      result *= 60;
+      result += t->tm_min;
+      result *= 60;
+      result += t->tm_sec;
+      if (t->tm_isdst == 1)
+          result -= 3600;
+      /*@ -matchanyintegral @*/
+      return (result);
+  }
+
+}