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