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 "sysdep.h"
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <ctype.h>
  16 #include <string.h>
  17
  18 #if TIME_WITH_SYS_TIME
  19 # include <sys/time.h>
  20 # include <time.h>
  21 #else
  22 # if HAVE_SYS_TIME_H
  23 #  include <sys/time.h>
  24 # else
  25 #  include <time.h>
  26 # endif
  27 #endif
  28
  29 #include "genstamp.h"
  30
  31
  32 static char *months[] = {
  33         "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  34         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  35 };
  36
  37 static char *weekdays[] = {
  38         "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  39 };
  40
  41
  42 /*
  43  * Supplied with a unix timestamp, generate an RFC822-compliant textual
  44  * time and date stamp.
  45  */
  46 void datestring(char *buf, size_t n, time_t xtime, int which_format) {
  47         struct tm *t;
  48
  49         long offset;
  50         char offsign;
  51
  52         t = localtime(&xtime);
  53
  54         /* Convert "seconds west of GMT" to "hours/minutes offset" */
  55 #ifdef HAVE_STRUCT_TM_TM_GMTOFF
  56         offset = t->tm_gmtoff;
  57 #else
  58         offset = timezone;
  59 #endif
  60         if (offset > 0) {
  61                 offsign = '-';
  62         }
  63         else {
  64                 offset = 0L - offset;
  65                 offsign = '+';
  66         }
  67         offset = ( (offset / 3600) * 100 ) + ( offset % 60 );
  68
  69         switch(which_format) {
  70
  71                 case DATESTRING_RFC822:
  72                         snprintf(buf, n, "%s, %02d %s %04d %02d:%02d:%02d %c%04ld",
  73                                 weekdays[t->tm_wday],
  74                                 t->tm_mday,
  75                                 months[t->tm_mon],
  76                                 t->tm_year + 1900,
  77                                 t->tm_hour,
  78                                 t->tm_min,
  79                                 t->tm_sec,
  80                                 offsign, offset
  81                                 );
  82                 break;
  83
  84                 case DATESTRING_IMAP:
  85                         snprintf(buf, n, "%02d-%s-%04d %02d:%02d:%02d %c%04ld",
  86                                 t->tm_mday,
  87                                 months[t->tm_mon],
  88                                 t->tm_year + 1900,
  89                                 t->tm_hour,
  90                                 t->tm_min,
  91                                 t->tm_sec,
  92                                 offsign, offset
  93                                 );
  94                 break;
  95
  96         }
  97 }
  98