citadel/genstamp.c

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