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 { /* TODO: this gives empty strings on debian. */
  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 brief)
  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         if (brief) {
  64
  65                 /* If date == today, show only the time */
  66                 if ((tm.tm_year == today_tm.tm_year)
  67                   &&(tm.tm_mon == today_tm.tm_mon)
  68                   &&(tm.tm_mday == today_tm.tm_mday)) {
  69                         if (time_format == WC_TIMEFORMAT_24)
  70                                 wc_strftime(buf, 32, "%k:%M", &tm);
  71                         else
  72                                 wc_strftime(buf, 32, "%l:%M%p", &tm);
  73                 }
  74                 /* Otherwise, for messages up to 6 months old, show the month and day, and the time */
  75                 else if (today_timet - thetime < 15552000) {
  76                         if (time_format == WC_TIMEFORMAT_24)
  77                                 wc_strftime(buf, 32, "%b %d %k:%M", &tm);
  78                         else
  79                                 wc_strftime(buf, 32, "%b %d %l:%M%p", &tm);
  80                 }
  81                 /* older than 6 months, show only the date */
  82                 else {
  83                         wc_strftime(buf, 32, "%b %d %Y", &tm);
  84                 }
  85         }
  86         else {
  87                 if (time_format == WC_TIMEFORMAT_24)
  88                         wc_strftime(buf, 32, "%a %b %d %Y %T %Z", &tm);
  89                 else
  90                         wc_strftime(buf, 32, "%a %b %d %Y %r %Z", &tm);
  91         }
  92 }
  93
  94
  95 /*
  96  * Try to guess whether the user will prefer 12 hour or 24 hour time based on the locale.
  97  */
  98 long guess_calhourformat(void) {
  99         char buf[32];
 100         struct tm tm;
 101         memset(&tm, 0, sizeof tm);
 102         wc_strftime(buf, 32, "%X", &tm);
 103         if (buf[strlen(buf)-1] == 'M') {
 104                 return 12;
 105         }
 106         return 24;
 107 }
 108
 109
 110 /*
 111  * learn the users timeformat preference.
 112  */
 113 int get_time_format_cached (void)
 114 {
 115         long calhourformat;
 116         int *time_format_cache;
 117         time_format_cache = &(WC->time_format_cache);
 118         if (*time_format_cache == WC_TIMEFORMAT_NONE)
 119         {
 120                 get_pref_long("calhourformat", &calhourformat, 99);
 121
 122                 /* If we don't know the user's time format preference yet,
 123                  * make a guess based on the locale.
 124                  */
 125                 if (calhourformat == 99) {
 126                         calhourformat = guess_calhourformat();
 127                 }
 128
 129                 /* Now set the preference */
 130                 if (calhourformat == 24)
 131                         *time_format_cache = WC_TIMEFORMAT_24;
 132                 else
 133                         *time_format_cache = WC_TIMEFORMAT_AMPM;
 134         }
 135         return *time_format_cache;
 136 }
 137
 138 /*
 139  * Format TIME ONLY for output
 140  * buf          the output buffer
 141  * thetime      time to format into buf
 142  */
 143 void fmt_time(char *buf, time_t thetime)
 144 {
 145         struct tm *tm;
 146         int hour;
 147         int time_format;
 148
 149         time_format = get_time_format_cached ();
 150         buf[0] = 0;
 151         tm = localtime(&thetime);
 152         hour = tm->tm_hour;
 153         if (hour == 0)
 154                 hour = 12;
 155         else if (hour > 12)
 156                 hour = hour - 12;
 157
 158         if (time_format == WC_TIMEFORMAT_24) {
 159                 sprintf(buf, "%d:%02d",
 160                         tm->tm_hour, tm->tm_min
 161                 );
 162         }
 163         else {
 164                 sprintf(buf, "%d:%02d%s",
 165                         hour, tm->tm_min, ((tm->tm_hour > 12) ? "pm" : "am")
 166                 );
 167         }
 168 }
 169
 170
 171
 172
 173 /*
 174  * Break down the timestamp used in HTTP headers
 175  * Should read rfc1123 and rfc850 dates OK
 176  * FIXME won't read asctime
 177  * Doesn't understand timezone, but we only should be using GMT/UTC anyway
 178  */
 179 time_t httpdate_to_timestamp(StrBuf *buf)
 180 {
 181         time_t t = 0;
 182         struct tm tt;
 183         const char *c;
 184
 185         /** Skip day of week, to number */
 186         for (c = ChrPtr(buf); *c != ' '; c++)
 187                 ;
 188         c++;
 189
 190         memset(&tt, 0, sizeof(tt));
 191
 192         /* Get day of month */
 193         tt.tm_mday = atoi(c);
 194         for (; *c != ' ' && *c != '-'; c++);
 195         c++;
 196
 197         /* Get month */
 198         switch (*c) {
 199         case 'A':       /* April, August */
 200                 tt.tm_mon = (c[1] == 'p') ? 3 : 7;
 201                 break;
 202         case 'D':       /* December */
 203                 tt.tm_mon = 11;
 204                 break;
 205         case 'F':       /* February */
 206                 tt.tm_mon = 1;
 207                 break;
 208         case 'M':       /* March, May */
 209                 tt.tm_mon = (c[2] == 'r') ? 2 : 4;
 210                 break;
 211         case 'J':       /* January, June, July */
 212                 tt.tm_mon = (c[2] == 'n') ? ((c[1] == 'a') ? 0 : 5) : 6;
 213                 break;
 214         case 'N':       /* November */
 215                 tt.tm_mon = 10;
 216                 break;
 217         case 'O':       /* October */
 218                 tt.tm_mon = 9;
 219                 break;
 220         case 'S':       /* September */
 221                 tt.tm_mon = 8;
 222                 break;
 223         default:
 224                 return 42;
 225                 break;  /* NOTREACHED */
 226         }
 227         c += 4;
 228
 229         tt.tm_year = 0;
 230         /* Get year */
 231         tt.tm_year = atoi(c);
 232         for (; *c != ' '; c++);
 233         c++;
 234         if (tt.tm_year >= 1900)
 235                 tt.tm_year -= 1900;
 236
 237         /* Get hour */
 238         tt.tm_hour = atoi(c);
 239         for (; *c != ':'; c++);
 240         c++;
 241
 242         /* Get minute */
 243         tt.tm_min = atoi(c);
 244         for (; *c != ':'; c++);
 245         c++;
 246
 247         /* Get second */
 248         tt.tm_sec = atoi(c);
 249         for (; *c && *c != ' '; c++);
 250
 251         /* Got everything; let's go.  The global 'timezone' variable contains the
 252          * local timezone's offset from UTC, in seconds, so we apply that to tm_sec.
 253          * This produces an illegal value for tm_sec, but mktime() will normalize
 254          * it for us.  This eliminates the need to temporarily switch the environment
 255          * variable TZ to UTC, which is good because it fails to switch back on
 256          * some systems.
 257          */
 258         tzset();
 259         tt.tm_sec = tt.tm_sec - (int)timezone;
 260         t = mktime(&tt);
 261         return t;
 262 }
 263
 264
 265 void LoadTimeformatSettingsCache(StrBuf *Preference, long lvalue)
 266 {
 267         int *time_format_cache;
 268
 269          time_format_cache = &(WC->time_format_cache);
 270          if (lvalue == 24)
 271                  *time_format_cache = WC_TIMEFORMAT_24;
 272          else
 273                  *time_format_cache = WC_TIMEFORMAT_AMPM;
 274 }
 275
 276
 277
 278 void
 279 InitModule_DATETIME
 280 (void)
 281 {
 282         RegisterPreference(HKEY("calhourformat"), _("Time format"), PRF_INT, LoadTimeformatSettingsCache);
 283
 284
 285 }