08-15-2008
15 years ago I had to do some reverse engineering to rewrite in cobol85 a program written in cobol74...
I have heard a lot about NOT using goto like mad and spaggetti code, but never imagined what it could be like until that nightmare day where I was given thig challenge...
I almost went through depression after a week, and so had the help of the top analyst to play " Train " with me for a an extra week just to understand how the damn thing worked...
To give you an idea the goto started on the first line already, you had 400 lines of code
finishing with stop run on last line...
It took me 6 weeks to rewrite the program and almost 1200 lines of code.
But anyone able to read english can maintain what I wrote, and the reading of the first page you knew what and how it worked.
You just cant imagine how bad you feel when as a confirmed programmer you have been reading 3 pages of code not understanding whats going on and still have not seen the end.
OK I learned ( and forgot..) basic and basic clones PASCAL MANTISSE (Mainframe) COBOL
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LEARN ABOUT OSX
curl_getdate
curl_getdate(3) libcurl Manual curl_getdate(3)
NAME
curl_getdate - Convert a date string to number of seconds since January 1, 1970
SYNOPSIS
#include <curl/curl.h>
time_t curl_getdate(char *datestring, time_t *now );
DESCRIPTION
This function returns the number of seconds since January 1st 1970 in the UTC time zone, for the date and time that the datestring parame-
ter specifies. The now parameter is not used, pass a NULL there.
NOTE: This function was rewritten for the 7.12.2 release and this documentation covers the functionality of the new one. The new one is not
feature-complete with the old one, but most of the formats supported by the new one was supported by the old too.
PARSING DATES AND TIMES
A "date" is a string containing several items separated by whitespace. The order of the items is immaterial. A date string may contain
many flavors of items:
calendar date items
Can be specified several ways. Month names can only be three-letter english abbreviations, numbers can be zero-prefixed and the
year may use 2 or 4 digits. Examples: 06 Nov 1994, 06-Nov-94 and Nov-94 6.
time of the day items
This string specifies the time on a given day. You must specify it with 6 digits with two colons: HH:MM:SS. To not include the time
in a date string, will make the function assume 00:00:00. Example: 18:19:21.
time zone items
Specifies international time zone. There are a few acronyms supported, but in general you should instead use the specific relative
time compared to UTC. Supported formats include: -1200, MST, +0100.
day of the week items
Specifies a day of the week. Days of the week may be spelled out in full (using english): `Sunday', `Monday', etc or they may be
abbreviated to their first three letters. This is usually not info that adds anything.
pure numbers
If a decimal number of the form YYYYMMDD appears, then YYYY is read as the year, MM as the month number and DD as the day of the
month, for the specified calendar date.
EXAMPLES
Sun, 06 Nov 1994 08:49:37 GMT
Sunday, 06-Nov-94 08:49:37 GMT
Sun Nov 6 08:49:37 1994
06 Nov 1994 08:49:37 GMT
06-Nov-94 08:49:37 GMT
Nov 6 08:49:37 1994
06 Nov 1994 08:49:37
06-Nov-94 08:49:37
1994 Nov 6 08:49:37
GMT 08:49:37 06-Nov-94 Sunday
94 6 Nov 08:49:37
1994 Nov 6
06-Nov-94
Sun Nov 6 94
1994.Nov.6
Sun/Nov/6/94/GMT
Sun, 06 Nov 1994 08:49:37 CET
06 Nov 1994 08:49:37 EST
Sun, 12 Sep 2004 15:05:58 -0700
Sat, 11 Sep 2004 21:32:11 +0200
20040912 15:05:58 -0700
20040911 +0200
STANDARDS
This parser was written to handle date formats specified in RFC 822 (including the update in RFC 1123) using time zone name or time zone
delta and RFC 850 (obsoleted by RFC 1036) and ANSI C's asctime() format. These formats are the only ones RFC2616 says HTTP applications may
use.
RETURN VALUE
This function returns -1 when it fails to parse the date string. Otherwise it returns the number of seconds as described.
If the year is larger than 2037 on systems with 32 bit time_t, this function will return 0x7fffffff (since that is the largest possible
signed 32 bit number).
Having a 64 bit time_t is not a guarantee that dates beyond 03:14:07 UTC, January 19, 2038 will work fine. On systems with a 64 bit time_t
but with a crippled mktime(), curl_getdate will return -1 in this case.
REWRITE
The former version of this function was built with yacc and was not only very large, it was also never quite understood and it wasn't pos-
sible to build with non-GNU tools since only GNU Bison could make it thread-safe!
The rewrite was done for 7.12.2. The new one is much smaller and uses simpler code.
libcurl 7.0 12 Aug 2005 curl_getdate(3)