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DATE.C
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1991-01-11
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static char rcsid[] = "@(#)$Id: date.c,v 4.1 90/04/28 22:42:41 syd Exp $";
/*******************************************************************************
* The Elm Mail System - $Revision: 4.1 $ $State: Exp $
*
* Copyright (c) 1986, 1987 Dave Taylor
* Copyright (c) 1988, 1989, 1990 USENET Community Trust
*******************************************************************************
* Bug reports, patches, comments, suggestions should be sent to:
*
* Syd Weinstein, Elm Coordinator
* elm@DSI.COM dsinc!elm
*
*******************************************************************************
* $Log: date.c,v $
* Revision 4.1 90/04/28 22:42:41 syd
* checkin of Elm 2.3 as of Release PL0
*
* OS-9 specific now !!!
* =====================
******************************************************************************/
/** return the current date and time in a readable format! **/
/** also returns an ARPA RFC-822 format date... **/
#include "headers.h"
#include <time.h>
#include <sys/types.h>
#include <ctype.h>
extern struct tm *localtime();
extern long time();
#undef toupper
#undef tolower
#define MONTHS_IN_YEAR 11 /* 0-11 equals 12 months! */
#define FEB 1 /* 0 = January */
#define DAYS_IN_LEAP_FEB 29 /* leap year only */
#define ampm(n) (n > 12? n - 12 : n)
#define am_or_pm(n) (n > 11? (n > 23? "am" : "pm") : "am")
#define leapyear(year) ((year % 4 == 0) && (year % 100 != 0))
char *arpa_dayname[] = { "Sun", "Mon", "Tue", "Wed", "Thu",
"Fri", "Sat", "" };
char *arpa_monname[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec", ""};
int days_in_month[] = { 31, 28, 31, 30, 31, 30,
31, 31, 30, 31, 30, 31, -1};
char *get_arpa_date()
{
/** returns an ARPA standard date. The format for the date
according to DARPA document RFC-822 is exemplified by;
Mon, 12 Aug 85 6:29:08 MST
**/
static char buffer[SLEN]; /* static character buffer */
struct tm *the_time; /* Time structure, see CTIME(3C) */
long junk; /* time in seconds.... */
extern char *gettz(); /* top 2 os9lib */
junk = time((long *) 0); /* this must be here for it to work! */
the_time = localtime(&junk);
sprintf(buffer, "%s, %d %s %d %d:%02d:%02d %s",
arpa_dayname[the_time->tm_wday],
the_time->tm_mday % 32,
arpa_monname[the_time->tm_mon],
the_time->tm_year % 100,
the_time->tm_hour % 24,
the_time->tm_min % 61,
the_time->tm_sec % 61,
(gettz()));
return( (char *) buffer);
}
days_ahead(days, buffer)
int days;
char *buffer;
{
/** return in buffer the date (Day, Mon Day, Year) of the date
'days' days after today.
**/
struct tm *the_time; /* Time structure, see CTIME(3C) */
long junk; /* time in seconds.... */
junk = time((long *) 0); /* this must be here for it to work! */
the_time = localtime(&junk);
/* increment the day of the week */
the_time->tm_wday = (the_time->tm_wday + days) % 7;
/* the day of the month... */
the_time->tm_mday += days;
while (the_time->tm_mday > days_in_month[the_time->tm_mon]) {
if (the_time->tm_mon == FEB && leapyear(the_time->tm_year)) {
if (the_time->tm_mday > DAYS_IN_LEAP_FEB) {
the_time->tm_mday -= DAYS_IN_LEAP_FEB;
the_time->tm_mon += 1;
}
else
break; /* Is Feb 29, so leave */
}
else {
the_time->tm_mday -= days_in_month[the_time->tm_mon];
the_time->tm_mon += 1;
}
/* check the month of the year */
if (the_time->tm_mon > MONTHS_IN_YEAR) {
the_time->tm_mon -= (MONTHS_IN_YEAR + 1);
the_time->tm_year += 1;
}
}
/* now, finally, build the actual date string */
sprintf(buffer, "%s, %d %s %d",
arpa_dayname[the_time->tm_wday],
the_time->tm_mday % 32,
arpa_monname[the_time->tm_mon],
the_time->tm_year % 100);
}
fix_date(entry)
struct header_rec *entry;
{
/** This routine will 'fix' the date entry for the specified
message. This consists of 1) adjusting the year to 0-99
and 2) altering time from HH:MM:SS to HH:MM am|pm **/
if (atoi(entry->year) > 99)
sprintf(entry->year,"%d", atoi(entry->year) - 1900);
fix_time(entry->time);
}
fix_time(timestring)
char *timestring;
{
/** Timestring in format HH:MM:SS (24 hour time). This routine
will fix it to display as: HH:MM [am|pm] **/
int hour, minute;
sscanf(timestring, "%d:%d", &hour, &minute);
if (hour < 1 || hour == 24)
sprintf(timestring, "12:%02d am", minute);
else if (hour < 12)
sprintf(timestring, "%d:%02d am", hour, minute);
else if (hour == 12)
sprintf(timestring, "12:%02d pm", minute);
else if (hour < 24)
sprintf(timestring, "%d:%02d pm", hour-12, minute);
}
int
compare_parsed_dates(rec1, rec2)
struct date_rec rec1, rec2;
{
/** This function is very similar to the compare_dates
function but assumes that the two record structures
are already parsed and stored in "date_rec" format.
**/
if (rec1.year != rec2.year)
return( rec1.year - rec2.year );
if (rec1.month != rec2.month)
return( rec1.month - rec2.month );
if (rec1.day != rec2.day)
return( rec1.day - rec2.day );
if (rec1.hour != rec2.hour)
return( rec1.hour - rec2.hour );
return( rec1.minute - rec2.minute ); /* ignore seconds... */
}
int
month_number(name)
char *name;
{
/** return the month number given the month name... **/
char ch;
switch (tolower(name[0])) {
case 'a' : if ((ch = tolower(name[1])) == 'p') return(APRIL);
else if (ch == 'u') return(AUGUST);
else return(-1); /* error! */
case 'd' : return(DECEMBER);
case 'f' : return(FEBRUARY);
case 'j' : if ((ch = tolower(name[1])) == 'a') return(JANUARY);
else if (ch == 'u') {
if ((ch = tolower(name[2])) == 'n') return(JUNE);
else if (ch == 'l') return(JULY);
else return(-1); /* error! */
}
else return(-1); /* error */
case 'm' : if ((ch = tolower(name[2])) == 'r') return(MARCH);
else if (ch == 'y') return(MAY);
else return(-1); /* error! */
case 'n' : return(NOVEMBER);
case 'o' : return(OCTOBER);
case 's' : return(SEPTEMBER);
default : return(-1);
}
}
#ifdef SITE_HIDING
char *get_ctime_date()
{
/** returns a ctime() format date, but a few minutes in the
past...(more cunningness to implement hidden sites) **/
static char buffer[SLEN]; /* static character buffer */
struct tm *the_time; /* Time structure, see CTIME(3C) */
long junk; /* time in seconds.... */
junk = time((long *) 0); /* this must be here for it to work! */
the_time = localtime(&junk);
sprintf(buffer, "%s %s %d %02d:%02d:%02d %d",
arpa_dayname[the_time->tm_wday],
arpa_monname[the_time->tm_mon],
the_time->tm_mday % 32,
min(the_time->tm_hour % 24, (rand() % 24)),
min(abs(the_time->tm_min % 61 - (rand() % 60)), (rand() % 60)),
min(abs(the_time->tm_sec % 61 - (rand() % 60)), (rand() % 60)),
the_time->tm_year % 100 + 1900);
return( (char *) buffer);
}
#endif