citadel/genstamp.c

   1 /*
   2  * $Id$
   3  *
   4  * Function to generate RFC822-compliant textual time/date stamp
   5  *
   6  */
   7
   8 #ifdef DLL_EXPORT
   9 #define IN_LIBCIT
  10 #endif
  11
  12 #define timezonevar 1
  13
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <ctype.h>
  17 #include <string.h>
  18
  19 #if TIME_WITH_SYS_TIME
  20 # include <sys/time.h>
  21 # include <time.h>
  22 #else
  23 # if HAVE_SYS_TIME_H
  24 #  include <sys/time.h>
  25 # else
  26 #  include <time.h>
  27 # endif
  28 #endif
  29
  30 #include "genstamp.h"
  31
  32
  33 static char *months[] = {
  34         "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  35         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  36 };
  37
  38 static char *weekdays[] = {
  39         "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  40 };
  41
  42
  43 /*
  44  * Supplied with a unix timestamp, generate an RFC822-compliant textual
  45  * time and date stamp.
  46  */
  47 void datestring(char *buf, time_t xtime, int which_format) {
  48         struct tm *t;
  49
  50         long offset;
  51         char offsign;
  52
  53         t = localtime(&xtime);
  54
  55         /* Convert "seconds west of GMT" to "hours/minutes offset" */
  56 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
  57         offset = t->tm_gmtoff;
  58 #else
  59         offset = timezone;
  60 #endif
  61         if (offset > 0) {
  62                 offsign = '-';
  63         }
  64         else {
  65                 offset = 0L - offset;
  66                 offsign = '+';
  67         }
  68         offset = ( (offset / 3600) * 100 ) + ( offset % 60 );
  69
  70         switch(which_format) {
  71
  72                 case DATESTRING_RFC822:
  73                         sprintf(buf, "%s, %02d %s %04d %02d:%02d:%02d %c%04ld",
  74                                 weekdays[t->tm_wday],
  75                                 t->tm_mday,
  76                                 months[t->tm_mon],
  77                                 t->tm_year + 1900,
  78                                 t->tm_hour,
  79                                 t->tm_min,
  80                                 t->tm_sec,
  81                                 offsign, offset
  82                                 );
  83                 break;
  84
  85                 case DATESTRING_IMAP:
  86                         sprintf(buf, "%02d-%s-%04d %02d:%02d:%02d %c%04ld",
  87                                 t->tm_mday,
  88                                 months[t->tm_mon],
  89                                 t->tm_year + 1900,
  90                                 t->tm_hour,
  91                                 t->tm_min,
  92                                 t->tm_sec,
  93                                 offsign, offset
  94                                 );
  95                 break;
  96
  97         }
  98 }
  99