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       1                 :            : /* -*- mode: C -*-
       2                 :            :  *
       3                 :            :  *       File:         pdf-time-context.c
       4                 :            :  *       Date:         Sun May 18 13:08:37 2008
       5                 :            :  *
       6                 :            :  *       GNU PDF Library - Time Module Context management
       7                 :            :  *
       8                 :            :  */
       9                 :            : 
      10                 :            : /* Copyright (C) 2008-2011 Free Software Foundation, Inc. */
      11                 :            : 
      12                 :            : /* This program is free software: you can redistribute it and/or modify
      13                 :            :  * it under the terms of the GNU General Public License as published by
      14                 :            :  * the Free Software Foundation, either version 3 of the License, or
      15                 :            :  * (at your option) any later version.
      16                 :            :  *
      17                 :            :  * This program is distributed in the hope that it will be useful,
      18                 :            :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      19                 :            :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      20                 :            :  * GNU General Public License for more details.
      21                 :            :  *
      22                 :            :  * You should have received a copy of the GNU General Public License
      23                 :            :  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
      24                 :            :  */
      25                 :            : 
      26                 :            : #include <config.h>
      27                 :            : 
      28                 :            : #include <stdio.h>
      29                 :            : #include <time.h>
      30                 :            : #include <string.h>
      31                 :            : 
      32                 :            : #include <pdf-alloc.h>
      33                 :            : #include <pdf-time-context.h>
      34                 :            : 
      35                 :            : /* Time module context */
      36                 :            : struct pdf_time_context_s {
      37                 :            :   pdf_i32_t  local_time_gmt_offset;      /* Seconds west of GMT */
      38                 :            :   pdf_bool_t local_time_daylight_save; /* True if Daylight saving times */
      39                 :            : };
      40                 :            : 
      41                 :            : /* This context will be initialized only once at program startup, and it will
      42                 :            :  *  be treated as constant from then on, so there shouldn't be any problem
      43                 :            :  *  with multiple threading and reentrancy */
      44                 :            : static struct pdf_time_context_s time_context;
      45                 :            : pdf_bool_t time_context_initialized = PDF_FALSE;
      46                 :            : 
      47                 :            : void
      48                 :          0 : pdf_time_context_deinit (void)
      49                 :            : {
      50         [ #  # ]:          0 :   if (time_context_initialized)
      51                 :            :     {
      52                 :          0 :       memset (&time_context, 0, sizeof (time_context));
      53                 :          0 :       time_context_initialized = PDF_FALSE;
      54                 :            :       PDF_DEBUG_BASE ("Deinitialized Text context...");
      55                 :            :     }
      56                 :          0 : }
      57                 :            : 
      58                 :            : /* Initialize time context */
      59                 :            : pdf_bool_t
      60                 :        745 : pdf_time_context_init (pdf_error_t **error)
      61                 :            : {
      62                 :            :   time_t tloc;
      63                 :            :   struct tm* time_struct;
      64                 :            : 
      65                 :            :   /* If already initialized, just return */
      66         [ -  + ]:        745 :   if (time_context_initialized)
      67                 :          0 :     return PDF_TRUE;
      68                 :            : 
      69                 :        745 :   time (&tloc);
      70                 :        745 :   time_struct = localtime (&tloc);
      71                 :            : 
      72                 :            : #if defined PDF_HOST_WIN32
      73                 :            :   /* mingw does not support tm_gmtoff in struct tm, but it provides
      74                 :            :    * the _timezone global variable with the difference in seconds
      75                 :            :    * between GMT and local time. */
      76                 :            :   time_context.local_time_gmt_offset = _timezone;
      77                 :            : #else
      78                 :            :   /* Set GMT offset */
      79                 :        745 :   time_context.local_time_gmt_offset = time_struct->tm_gmtoff;
      80                 :            : #endif
      81                 :            : 
      82                 :            :   /* Set flag to indicate if Daylight saving times are applied in the system
      83                 :            :    * if needed */
      84                 :        745 :   time_context.local_time_daylight_save = (time_struct->tm_isdst == 0 ?
      85                 :            :                                            PDF_FALSE : PDF_TRUE);
      86                 :            : 
      87                 :            :   PDF_DEBUG_BASE("Initialized Time context...");
      88                 :            :   PDF_DEBUG_BASE("  GMT offset: %d secs", time_context.local_time_gmt_offset);
      89                 :            :   PDF_DEBUG_BASE("  Daylight saving? %s", time_context.local_time_daylight_save ? \
      90                 :            :                  "yes":"no");
      91                 :            : 
      92                 :        745 :   return PDF_TRUE;
      93                 :            : }
      94                 :            : 
      95                 :            : /* Get the GMT offset of the local time configuration. The offset is obtained as
      96                 :            :  *  seconds west of GMT */
      97                 :            : pdf_i32_t
      98                 :         79 : pdf_time_context_get_gmt_offset (void)
      99                 :            : {
     100                 :         79 :   return time_context.local_time_gmt_offset;
     101                 :            : }
     102                 :            : 
     103                 :            : /* End of pdf-time-context.c */