Rockbox

Patch adds RTC support to WPS. Format for time display
is user selectable.

%c starts time formatting. Any character other than
‘c’ or EOL is part of the format.

The following characters are supported for date
formatting (a subset of the unix date command):
case ‘d’: /* day of month (01..31) */
case ‘e’: /* day of month, blank padded ( 1..31) */
case ‘H’: /* hour (00..23) */
case ‘k’: /* hour ( 0..23) */
case ‘I’: /* hour (01..12) */
case ‘l’: /* hour ( 1..12) */
case ‘m’: /* month (01..12) */
case ‘M’: /* minute (00..59) */
case ‘S’: /* second (00..60) */
case ‘y’: /* last two digits of year (00..99) */
case ‘Y’: /* year (1970…) */
case ‘p’: /* upper case AM or PM indicator */
case ‘P’: /* lower case am or pm indicator */

Bugs: Only updates time every several seconds. This
appears to be how often the values supplied by
get_time() are updated. Is there another function that
should be used here? Would it be a bad idea to update
it more often, and should we therefore not support the
seconds tag?

Possible improvements that I don’t have a good idea on
how to make: Better termination of processing.
Relying on the wps writer to put the ending ‘c’ in is
rough. (only allow certain characters other than
flags?). Support for stringy month/day-of-week tags.