citadel/genstamp.c

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