code / tomo-time

   1 // Some helper logic for working with times.
   2 
   3 #pragma once
   4 #include <stdlib.h>
   5 #include <sys/time.h>
   6 #include <time.h>
   7 
   8 static OptionalText_t _local_timezone = NONE_TEXT;
   9 
  10 static void set_local_timezone(Text_t tz) {
  11   setenv("TZ", Text$as_c_string(tz), 1);
  12   _local_timezone = tz;
  13   tzset();
  14 }
  15 
  16 #define WITH_TIMEZONE(tz, body)                                                \
  17   ({                                                                           \
  18     if (tz.length >= 0) {                                                      \
  19       OptionalText_t old_timezone = _local_timezone;                           \
  20       set_local_timezone(tz);                                                  \
  21       body;                                                                    \
  22       set_local_timezone(old_timezone);                                        \
  23     } else {                                                                   \
  24       body;                                                                    \
  25     }                                                                          \
  26   })