citadel/genstamp.c

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