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mirror of https://github.com/rkd77/elinks.git synced 2025-02-02 15:09:23 -05:00
elinks/src/protocol
2008-06-02 10:40:34 +03:00
..
auth 1008: Centralize random numbers. 2008-05-25 18:44:21 +03:00
bittorrent 1008: Centralize random numbers. 2008-05-25 18:44:21 +03:00
file 1008: rename http_read_post_data to read_http_post 2008-05-26 10:40:43 +03:00
finger NET: Move cache entry normalization to abort_connection 2006-02-08 21:40:08 +01:00
fsp Bug 939: Documented the fix. 2008-04-28 11:04:27 +03:00
ftp 1008: Call and reset conn->done when freeing conn->info. 2008-05-22 03:59:33 +03:00
gopher 1008: Call and reset conn->done when freeing conn->info. 2008-05-22 03:59:33 +03:00
http 1008: move stuff to new src/protocol/http/post.{c,h} 2008-06-02 10:40:34 +03:00
nntp 1008: Call and reset conn->done when freeing conn->info. 2008-05-22 03:59:33 +03:00
rewrite Merge branch 'elinks-0.12' into elinks-0.13 2008-03-08 15:35:12 +02:00
smb Merge branch 'elinks-0.12' into elinks-0.13 2008-03-15 19:24:51 +02:00
test Add tests for cwd-relative file URIs. 2007-09-09 20:06:25 +03:00
about.c about_protocol_handler: Don't define len if CONFIG_SMALL. 2006-12-10 17:16:38 +02:00
about.h Remove empty lines in start of header files 2005-11-15 11:33:27 +01:00
common.c Use add_string_to_string where applicable. 2007-03-18 20:29:08 +02:00
common.h DIRLIST: Add helper to at start of (HTML) directory listing 2006-01-30 01:22:31 +01:00
data.c Cast the NULL argument of straconcat to unsigned char *. 2007-03-11 12:59:11 +02:00
data.h Remove empty lines in start of header files 2005-11-15 11:33:27 +01:00
date.c parse_time: set tm_sec to zero before conditional second parsing 2008-02-28 23:38:42 +02:00
date.h Remove empty lines in start of header files 2005-11-15 11:33:27 +01:00
header.c parse_header_param: better describe behaviour when @ret is NULL 2006-06-23 06:07:22 +00:00
header.h parse_header_param stores the string via a pointer parameter. 2006-06-05 20:22:53 +00:00
Makefile Bug 744: Add tests. There are four failures. 2007-07-19 13:46:47 +03:00
protocol.c Bug 744: Make removal of double slashes more protocol specific 2007-09-11 14:14:17 +02:00
protocol.h Bug 744: Make removal of double slashes more protocol specific 2007-09-11 14:14:17 +02:00
proxy.c get_opt_*: Add ses parameter 2007-08-28 17:24:59 +00:00
proxy.h Strings corrections from Malcolm Parsons 2008-01-27 04:19:23 +00:00
README.timegm Move README.timegm to the same directory as date.c. 2007-01-13 10:01:51 +02:00
uri.c bug 1000: Do not discard the query part of URI. 2008-03-02 17:45:29 +02:00
uri.h 1008: s/big_file/file/g . 2008-05-12 12:51:53 +02:00
user.c Trim trailing whitespaces. 2007-09-14 15:12:32 +02:00
user.h Remove empty lines in start of header files 2005-11-15 11:33:27 +01:00

This file contains description of our my_timegm() function in date.c. It was
posted as a mail to links-list by Stephane Chazelas, and I thought it may be
interesting for someone, so I decided to include it in the ELinks distribution.




Un explanation for it as one (me to start with) may wonder why
this works.

We first change of calendar. To make things easy, let's say
that 0/0/0 0:0:0 in our new calendar is the Marsh 1st 1968, so
just after a february 29th as 1968 was a leap year.

if y/m/d h:min:s is time in our calendar
and
   Y/M/D h:min:s in the new calendar

M = m - 1 - 2 (+ 12 if m < 3)
Y = y - 68 (-1 if m < 3)
D = d - 1

at Y/0/0 0:0:0, there has been Y / 4 leap years in the past, so
(int) 365 * Y + Y / 4 days have past.

at Y/M/0 0:0:0, lets find how many days have past since Y/0/0:

                   |Mar                                        Feb
                  M| 0   1   2   3   4   5   6   7   8   9  10  11
-------------------+-----------------------------------------------
 days in that month|31  30  31  30  31  31  30  31  30  31  31  28 or 29
-------------------+-----------------------------------------------
  x = days at Y/M/0| 0  31  61  92 122 153 184 214 245 275 306 337
-------------------+-----------------------------------------------
first approximation|
         y = 30 * M| 0  30  60  90 120 150 180 210 240 270 300 330
-------------------+-----------------------------------------------
              x - y| 0   1   1   2   2   3   4   4   5   5   6   7
-------------------+-----------------------------------------------
(M + 4) * 3 / 5 - 2| 0   1   1   2   2   3   4   4   5   5   6   7
-------------------+-----------------------------------------------

x - y = (M + 4) * 3 / 5 - 2

x = 30 * M + (M + 4) * 3 / 5 - 2

x = (153 * M + 2) / 5

So at Y/M/D 0:0:0,

Y * 1461 / 4 + (153 * M + 2) / 5 + D days have past since
the 1st of March of 1968

1st of March of 1968 was 671 days before 1970 Jan 1st (year 0
for unix time())

So
t = s + 60 * (min + 60 * (h + 24 * (Y * 1461 / 4 + (153 * M + 2) / 5 + D - 671)))
t = s + 60 * (min + 60 * (h + 24 * (Y * 1461 / 4 + (153 * M + 2) / 5 + d - 672)))

This shouldn't work past 2100/02/28 23:59:59 as 2100 is not a leap year.

--
St<53>phane