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/*
* sccsdate.cc: Part of GNU CSSC.
*
*
* Copyright (C) 1997, Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*
* CSSC was originally Based on MySC, by Ross Ridge, which was
* placed in the Public Domain.
*
*
* Members of the class sccs_date.
*
*/
#ifdef __GNUC__
#pragma implementation "sccsdate.h"
#endif
#include "cssc.h"
#include "sccsdate.h"
#include <time.h>
#include <ctype.h>
#ifdef CONFIG_SCCS_IDS
static const char rcs_id[] = "CSSC $Id: sccsdate.cc,v 1.16 2002/04/04 19:32:05 james_youngman Exp $";
#endif
// The MySC code used to just check for (year % 4) and (year == 0).
// This implementation is "right", but in any case it won't make a
// difference until 2100AD.
static int
is_leapyear(int year)
{
if (year % 4)
{
return 0; // not a leapyear.
}
else
{
if (year % 100)
{
return 1; // non-century year
}
else
{
if (year % 400)
return 0; // century years are not leap-years exceot
else
return 1; // every fourth one, which IS a leap year.
}
}
}
static int
days_in_month(int mon, int year)
{
switch(mon)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
return 31;
case 4:
case 6:
case 9:
case 11:
return 30;
case 2:
if (is_leapyear(year))
return 29;
else
return 28;
}
return -1;
}
static inline int
is_digit(char ch)
{
return isdigit( (unsigned char) ch );
}
static inline int
get_digit(char ch)
{
ASSERT(isdigit( (unsigned char) ch ));
return ch - '0';
}
static int
get_two_digits(const char *s)
{
return get_digit(s[0]) * 10 + get_digit(s[1]);
}
static int
get_part(const char *&s, int def)
{
char c = *s;
while (c)
{
if (is_digit(c))
{
s++;
if (is_digit(*s))
{
return get_digit(c) * 10 + get_digit(*s++);
}
else
{
return get_digit(c);
}
}
c = *++s;
}
return def;
}
static int
count_digits(const char *s)
{
int count;
for(count=0; *s; s++)
{
if (is_digit((unsigned char)*s))
count++;
}
return count;
}
// Construct a date as specified on the command line.
sccs_date::sccs_date(const char *s)
{
ASSERT(s != 0);
/* if (s == 0) return; */
// A fully-qualified YYmmDDhhMMss specification contains
// twelve (12) digits. If we have more than that, assume that
// the first two digits are the century. We have to make this
// count before the first call to get_part(), since that
// actually advances the pointer.
const int n_digits = count_digits(s);
// Get and check the year part.
if ( (year = get_part(s, -1)) == -1)
return;
#if 1
// Here be Year-2000 code.
//
// This code checks if the year is 19 or 20 AND the next two
// characters are ALSO digits. If so, we assume that we've
// just got the century. This is an extension with respect to
// "real" SCCS.
//
// To prevent this simply breaking down in the year 2019 (with
// a two digit year part), we only activate this measure if we
// have more than the regulation number of digits.
//
// The version of MySC which I inherited assumed the first 2
// digits to be the century part if they were 19 or 20. This
// approach breaks down rather unexpectedly for the user in
// the year 2019.
//
if (n_digits > 12)
{
// If we actually have a 4-digit year, the next two
// characters must be digits (we have already consumed the
// first two).
if (isdigit((unsigned char)s[0]) &&
isdigit((unsigned char)s[1]))
{
const int century_field_val = year;
year = (century_field_val * 100) + get_two_digits(&s[0]);
s += 2; // this consumes exactly two characters.
}
}
else
{
// In the X/Open Commands and Utilities Issue 5 standard,
// it is specified that yy/mm/dd type dates with values
// for "yy" which range from 69-99 are to be interpreted
// as 1969-1999 and dates with year values 00-68 are to be
// interpreted as 2000-2068.
//
// For more information about this, please see that
// document itself and also the X/Open Year-2000 FAQ,
// which can be obtained from the URL
// http://www.xopen.org/public/tech/base/year2000.html
//
if (year < 69)
year += 2000;
else
year += 1900;
}
#endif
month = get_part(s, 12);
month_day = get_part(s, days_in_month(month, year));
hour = get_part(s, 23);
minute = get_part(s, 59);
second = get_part(s, 59);
update_yearday();
}
// Construct a date as specified in an SCCS file.
sccs_date::sccs_date(const char *date, const char *time)
{
char buf[11];
int century;
// Peter Kjellerstedt writes:-
//
// This is a gross hack to handle that some old implementation of SCCS
// has a Y2K bug that results in that dates are written incorrectly as
// :0/01/01 instead of 00/01/01 (the colon is of course the next
// character after '9' in the ASCII table). The following should handle
// this correctly for years up to 2069 (after which the time format
// used is not valid anyway).
strncpy(buf, date, 11);
/* Check for the symtoms of SourceForge bug ID 513800, where
* the Data General version of Unix puts a four-digit year
* into the p-file.
*/
if (strlen(buf) > 4
&& is_digit(buf[0])
&& is_digit(buf[1])
&& is_digit(buf[2])
&& is_digit(buf[3])
&& ('/' == buf[4]))
{
warning("this file has been written by a version of SCCS"
" which uses four-digit years, which is contrary to the"
" common SCCS file format (though it might have been a "
" good idea in the first place)\n");
century = get_two_digits(&buf[0]);
date = buf + 2;
}
else
{
// this is a normal two-digit date.
century = 0; // decide by windowing.
date = buf;
}
if (buf[0] >= ':' && buf[0] <= '@')
{
warning("date in SCCS file contains character '%c': "
"a version of SCCS which is not Year 2000 compliant "
"has probably been used on this file.\n",
buf[0]);
buf[0] -= 10;
}
// The "1" in the if() is just there to make Emacs align the columns.
if (1
&& is_digit(date[0]) && is_digit(date[1]) && date[2] == '/'
&& is_digit(date[3]) && is_digit(date[4]) && date[5] == '/'
&& is_digit(date[6]) && is_digit(date[7]) && date[8] == 0
&& is_digit(time[0]) && is_digit(time[1]) && time[2] == ':'
&& is_digit(time[3]) && is_digit(time[4]) && time[5] == ':'
&& is_digit(time[6]) && is_digit(time[7]) && time[8] == '\0')
{
year = get_two_digits(&date[0]);
month = get_two_digits(&date[3]);
month_day = get_two_digits(&date[6]);
hour = get_two_digits(&time[0]);
minute = get_two_digits(&time[3]);
second = get_two_digits(&time[6]);
// Year 2000 fix (mandated by X/Open white paper, see above
// for more details).
if (century)
{
// SourceForge bug ID 513800 - Data General Unix uses 4-digit year
// in the p-file.
year = century * 100 + year;
}
else
{
if (year < 69)
year += 2000;
else
year += 1900;
}
update_yearday();
ASSERT(year >= 1969);
ASSERT(year < 2069);
}
}
int
sccs_date::printf(FILE *f, char fmt) const
{
const int yy = year % 100;
switch(fmt)
{
case 'D':
return printf_failed(fprintf(f, "%02d/%02d/%02d",
yy, month, month_day));
case 'H':
return printf_failed(fprintf(f, "%02d/%02d/%02d",
month, month_day, yy));
case 'T':
return printf_failed(fprintf(f, "%02d:%02d:%02d",
hour, minute, second));
}
int value = 0;
switch (fmt)
{
case 'y':
value = yy;
break;
case 'o':
value = month;
break;
case 'd':
value = month_day;
break;
case 'h':
value = hour;
break;
case 'm':
value = minute;
break;
case 's':
value = second;
break;
default:
ASSERT(!"sccs_date::printf: Invalid format");
// This code IS reached, when ASSERT() expands to nothing.
// TODO: throw exception here
}
return printf_failed(fprintf(f, "%02d", value));
}
int
sccs_date::print(FILE *f) const
{
return this->printf(f, 'D')
|| putc_failed(putc(' ', f))
|| this->printf(f, 'T');
}
mystring
sccs_date::as_string() const
{
char buf[18];
const int yy = year % 100;
sprintf(buf, "%02d/%02d/%02d %02d:%02d:%02d",
yy, month, month_day,
hour, minute, second);
return mystring(buf);
}
sccs_date::sccs_date(int yr, int mth, int day,
int hr, int min, int sec)
: year(yr), month(mth), month_day(day),
hour(hr), minute(min), second(sec)
{
update_yearday();
}
sccs_date::sccs_date()
: year(-1), month(-1), month_day(-1),
hour(-1), minute(-1), second(-1)
{
}
sccs_date
sccs_date::now() // static member.
{
time_t tt;
time(&tt); // TODO: throw exception if this fails.
struct tm *ptm = localtime(&tt);
return sccs_date(ptm->tm_year+1900, ptm->tm_mon+1, ptm->tm_mday,
ptm->tm_hour, ptm->tm_min, ptm->tm_sec);
}
void
sccs_date::update_yearday()
{
int m=1, d=1;
yearday = 1;
while (m < month)
yearday += days_in_month(m++, year);
while (d++ < month_day)
yearday++;
daysecond = ((hour * 60) + minute) * 60 + second;
}
int sccs_date::compare(const sccs_date& d) const
{
int diff;
if ( (diff = year - d.year) != 0 )
return diff;
else if ( (diff = yearday - d.yearday) != 0)
return diff;
else
return daysecond - d.daysecond;
}
int sccs_date::operator >(sccs_date const & d) const
{
return compare(d) > 0;
}
int sccs_date::operator <(sccs_date const &d) const
{
return compare(d) < 0;
}
int sccs_date::operator <=(sccs_date const &d) const
{
return compare(d) <= 0;
}
int
sccs_date::valid() const
{
// Allow the seconds field to get as high as 61, since that is what
// the ANSI C spec for struct tm says, and we have to use a struct
// tm with localtime().
return year >= 0
&& month > 0 && month < 13
&& month_day > 0 && month_day <= days_in_month(month, year)
&& hour >= 0 && hour < 24
&& minute >= 0 && minute < 60
&& second >= 0 && second <= 61;
}
/* Local variables: */
/* mode: c++ */
/* End: */
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