webcit/fmt_date.c

   1 /*
   2  * $Id$
   3  */
   4
   5 #include "webcit.h"
   6 #include "webserver.h"
   7
   8 #ifdef HAVE_USELOCALE
   9 extern locale_t wc_locales[];
  10 #endif
  11
  12 typedef unsigned char byte;
  13
  14 #define FALSE 0 /**< no. */
  15 #define TRUE 1 /**< yes. */
  16
  17 /*
  18  * Wrapper around strftime() or strftime_l()
  19  * depending upon how our build is configured.
  20  *
  21  * s            String target buffer
  22  * max          Maximum size of string target buffer
  23  * format       strftime() format
  24  * tm           Input date/time
  25  */
  26 size_t wc_strftime(char *s, size_t max, const char *format, const struct tm *tm)
  27 {
  28
  29 #ifdef ENABLE_NLS
  30 #ifdef HAVE_USELOCALE
  31         if (wc_locales[WC->selected_language] == NULL) {
  32                 return strftime(s, max, format, tm);
  33         }
  34         else {
  35                 return strftime_l(s, max, format, tm, wc_locales[WC->selected_language]);
  36         }
  37 #else
  38         return strftime(s, max, format, tm);
  39 #endif
  40 #else
  41         return strftime(s, max, format, tm);
  42 #endif
  43 }
  44
  45
  46
  47 /*
  48  * Format a date/time stamp for output
  49  */
  50 void webcit_fmt_date(char *buf, time_t thetime, int Format)
  51 {
  52         struct tm tm;
  53         struct tm today_tm;
  54         time_t today_timet;
  55         int time_format;
  56
  57         time_format = get_time_format_cached ();
  58         today_timet = time(NULL);
  59         localtime_r(&today_timet, &today_tm);
  60
  61         localtime_r(&thetime, &tm);
  62
  63         /*
  64          * DATEFMT_FULL:      full display
  65          * DATEFMT_BRIEF:     if date == today, show only the time
  66          *                    otherwise, for messages up to 6 months old,
  67          *                 show the month and day, and the time
  68          *                    older than 6 months, show only the date
  69          * DATEFMT_RAWDATE:   show full date, regardless of age
  70          * DATEFMT_LOCALEDATE:   show full date as prefered for the locale
  71          */
  72
  73         switch (Format) {
  74                 case DATEFMT_BRIEF:
  75                         if ((tm.tm_year == today_tm.tm_year)
  76                           &&(tm.tm_mon == today_tm.tm_mon)
  77                           &&(tm.tm_mday == today_tm.tm_mday)) {
  78                                 if (time_format == WC_TIMEFORMAT_24)
  79                                         wc_strftime(buf, 32, "%k:%M", &tm);
  80                                 else
  81                                         wc_strftime(buf, 32, "%l:%M%p", &tm);
  82                         }
  83                         else if (today_timet - thetime < 15552000) {
  84                                 if (time_format == WC_TIMEFORMAT_24)
  85                                         wc_strftime(buf, 32, "%b %d %k:%M", &tm);
  86                                 else
  87                                         wc_strftime(buf, 32, "%b %d %l:%M%p", &tm);
  88                         }
  89                         else {
  90                                 wc_strftime(buf, 32, "%b %d %Y", &tm);
  91                         }
  92                         break;
  93                 case DATEFMT_FULL:
  94                         if (time_format == WC_TIMEFORMAT_24)
  95                                 wc_strftime(buf, 32, "%a %b %d %Y %T %Z", &tm);
  96                         else
  97                                 wc_strftime(buf, 32, "%a %b %d %Y %r %Z", &tm);
  98                         break;
  99                 case DATEFMT_RAWDATE:
 100                         wc_strftime(buf, 32, "%a %b %d %Y", &tm);
 101                         break;
 102                 case DATEFMT_LOCALEDATE:
 103                         wc_strftime(buf, 32, "%x", &tm);
 104                         break;
 105         }
 106 }
 107
 108
 109 /*
 110  * Try to guess whether the user will prefer 12 hour or 24 hour time based on the locale.
 111  */
 112 long guess_calhourformat(void) {
 113         char buf[32];
 114         struct tm tm;
 115         memset(&tm, 0, sizeof tm);
 116         wc_strftime(buf, 32, "%X", &tm);
 117         if (buf[strlen(buf)-1] == 'M') {
 118                 return 12;
 119         }
 120         return 24;
 121 }
 122
 123
 124 /*
 125  * learn the users timeformat preference.
 126  */
 127 int get_time_format_cached (void)
 128 {
 129         long calhourformat;
 130         int *time_format_cache;
 131         time_format_cache = &(WC->time_format_cache);
 132         if (*time_format_cache == WC_TIMEFORMAT_NONE)
 133         {
 134                 get_pref_long("calhourformat", &calhourformat, 99);
 135
 136                 /* If we don't know the user's time format preference yet,
 137                  * make a guess based on the locale.
 138                  */
 139                 if (calhourformat == 99) {
 140                         calhourformat = guess_calhourformat();
 141                 }
 142
 143                 /* Now set the preference */
 144                 if (calhourformat == 24)
 145                         *time_format_cache = WC_TIMEFORMAT_24;
 146                 else
 147                         *time_format_cache = WC_TIMEFORMAT_AMPM;
 148         }
 149         return *time_format_cache;
 150 }
 151
 152 /*
 153  * Format TIME ONLY for output
 154  * buf          the output buffer
 155  * thetime      time to format into buf
 156  */
 157 void fmt_time(char *buf, time_t thetime)
 158 {
 159         struct tm *tm;
 160         int hour;
 161         int time_format;
 162
 163         time_format = get_time_format_cached ();
 164         buf[0] = 0;
 165         tm = localtime(&thetime);
 166         hour = tm->tm_hour;
 167         if (hour == 0)
 168                 hour = 12;
 169         else if (hour > 12)
 170                 hour = hour - 12;
 171
 172         if (time_format == WC_TIMEFORMAT_24) {
 173                 sprintf(buf, "%d:%02d",
 174                         tm->tm_hour, tm->tm_min
 175                 );
 176         }
 177         else {
 178                 sprintf(buf, "%d:%02d%s",
 179                         hour, tm->tm_min, ((tm->tm_hour > 12) ? "pm" : "am")
 180                 );
 181         }
 182 }
 183
 184
 185
 186
 187 /*
 188  * Break down the timestamp used in HTTP headers
 189  * Should read rfc1123 and rfc850 dates OK
 190  * FIXME won't read asctime
 191  * Doesn't understand timezone, but we only should be using GMT/UTC anyway
 192  */
 193 time_t httpdate_to_timestamp(StrBuf *buf)
 194 {
 195         time_t t = 0;
 196         struct tm tt;
 197         const char *c;
 198
 199         /** Skip day of week, to number */
 200         for (c = ChrPtr(buf); *c != ' '; c++)
 201                 ;
 202         c++;
 203
 204         memset(&tt, 0, sizeof(tt));
 205
 206         /* Get day of month */
 207         tt.tm_mday = atoi(c);
 208         for (; *c != ' ' && *c != '-'; c++);
 209         c++;
 210
 211         /* Get month */
 212         switch (*c) {
 213         case 'A':       /* April, August */
 214                 tt.tm_mon = (c[1] == 'p') ? 3 : 7;
 215                 break;
 216         case 'D':       /* December */
 217                 tt.tm_mon = 11;
 218                 break;
 219         case 'F':       /* February */
 220                 tt.tm_mon = 1;
 221                 break;
 222         case 'M':       /* March, May */
 223                 tt.tm_mon = (c[2] == 'r') ? 2 : 4;
 224                 break;
 225         case 'J':       /* January, June, July */
 226                 tt.tm_mon = (c[2] == 'n') ? ((c[1] == 'a') ? 0 : 5) : 6;
 227                 break;
 228         case 'N':       /* November */
 229                 tt.tm_mon = 10;
 230                 break;
 231         case 'O':       /* October */
 232                 tt.tm_mon = 9;
 233                 break;
 234         case 'S':       /* September */
 235                 tt.tm_mon = 8;
 236                 break;
 237         default:
 238                 return 42;
 239                 break;  /* NOTREACHED */
 240         }
 241         c += 4;
 242
 243         tt.tm_year = 0;
 244         /* Get year */
 245         tt.tm_year = atoi(c);
 246         for (; *c != ' '; c++);
 247         c++;
 248         if (tt.tm_year >= 1900)
 249                 tt.tm_year -= 1900;
 250
 251         /* Get hour */
 252         tt.tm_hour = atoi(c);
 253         for (; *c != ':'; c++);
 254         c++;
 255
 256         /* Get minute */
 257         tt.tm_min = atoi(c);
 258         for (; *c != ':'; c++);
 259         c++;
 260
 261         /* Get second */
 262         tt.tm_sec = atoi(c);
 263         for (; *c && *c != ' '; c++);
 264
 265         /* Got everything; let's go.  The global 'timezone' variable contains the
 266          * local timezone's offset from UTC, in seconds, so we apply that to tm_sec.
 267          * This produces an illegal value for tm_sec, but mktime() will normalize
 268          * it for us.  This eliminates the need to temporarily switch the environment
 269          * variable TZ to UTC, which is good because it fails to switch back on
 270          * some systems.
 271          */
 272         tzset();
 273         tt.tm_sec = tt.tm_sec - (int)timezone;
 274         t = mktime(&tt);
 275         return t;
 276 }
 277
 278
 279 void LoadTimeformatSettingsCache(StrBuf *Preference, long lvalue)
 280 {
 281         int *time_format_cache;
 282
 283          time_format_cache = &(WC->time_format_cache);
 284          if (lvalue == 24)
 285                  *time_format_cache = WC_TIMEFORMAT_24;
 286          else
 287                  *time_format_cache = WC_TIMEFORMAT_AMPM;
 288 }
 289
 290
 291
 292 void
 293 InitModule_DATETIME
 294 (void)
 295 {
 296         RegisterPreference("calhourformat", _("Time format"), PRF_INT, LoadTimeformatSettingsCache);
 297
 298
 299 }