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