zic.c

早期freebsd实现

}

static void
associate()
{
	register struct zone *	zp;
	register struct rule *	rp;
	register int		base, out;
	register int		i;

	if (nrules != 0)
		(void) qsort((void *) rules, (size_t) nrules,
		     (size_t) sizeof *rules, rcomp);
	for (i = 0; i < nzones; ++i) {
		zp = &zones[i];
		zp->z_rules = NULL;
		zp->z_nrules = 0;
	}
	for (base = 0; base < nrules; base = out) {
		rp = &rules[base];
		for (out = base + 1; out < nrules; ++out)
			if (strcmp(rp->r_name, rules[out].r_name) != 0)
				break;
		for (i = 0; i < nzones; ++i) {
			zp = &zones[i];
			if (strcmp(zp->z_rule, rp->r_name) != 0)
				continue;
			zp->z_rules = rp;
			zp->z_nrules = out - base;
		}
	}
	for (i = 0; i < nzones; ++i) {
		zp = &zones[i];
		if (zp->z_nrules == 0) {
			/*
			** Maybe we have a local standard time offset.
			*/
			eat(zp->z_filename, zp->z_linenum);
			zp->z_stdoff =
			    gethms((char *)zp->z_rule, "unruly zone", TRUE);
			/*
			** Note, though, that if there's no rule,
			** a '%s' in the format is a bad thing.
			*/
			if (strchr(zp->z_format, '%') != 0)
				error("%s in ruleless zone");
		}
	}
	if (errors)
		(void) exit(EXIT_FAILURE);
}

static void
infile(name)
const char *	name;
{
	register FILE *			fp;
	register char **		fields;
	register char *			cp;
	register const struct lookup *	lp;
	register int			nfields;
	register int			wantcont;
	register int			num;
	char				buf[BUFSIZ];

	if (strcmp(name, "-") == 0) {
		name = "standard input";
		fp = stdin;
	} else if ((fp = fopen(name, "r")) == NULL) {
		(void) fprintf(stderr, "%s: Can't open ", progname);
		(void) perror(name);
		(void) exit(EXIT_FAILURE);
	}
	wantcont = FALSE;
	for (num = 1; ; ++num) {
		eat(name, num);
		if (fgets(buf, (int) sizeof buf, fp) != buf)
			break;
		cp = strchr(buf, '\n');
		if (cp == NULL) {
			error("line too long");
			(void) exit(EXIT_FAILURE);
		}
		*cp = '\0';
		fields = getfields(buf);
		nfields = 0;
		while (fields[nfields] != NULL) {
			if (ciequal(fields[nfields], "-"))
				fields[nfields] = "";
			++nfields;
		}
		if (nfields == 0) {
			/* nothing to do */
		} else if (wantcont) {
			wantcont = inzcont(fields, nfields);
		} else {
			lp = byword(fields[0], line_codes);
			if (lp == NULL)
				error("input line of unknown type");
			else switch ((int) (lp->l_value)) {
				case LC_RULE:
					inrule(fields, nfields);
					wantcont = FALSE;
					break;
				case LC_ZONE:
					wantcont = inzone(fields, nfields);
					break;
				case LC_LINK:
					inlink(fields, nfields);
					wantcont = FALSE;
					break;
				case LC_LEAP:
					if (name != leapsec)
						(void) fprintf(stderr,
"%s: Leap line in non leap seconds file %s\n",
							progname, name);
					else	inleap(fields, nfields);
					wantcont = FALSE;
					break;
				default:	/* "cannot happen" */
					(void) fprintf(stderr,
"%s: panic: Invalid l_value %d\n",
						progname, lp->l_value);
					(void) exit(EXIT_FAILURE);
			}
		}
		ifree((char *) fields);
	}
	if (ferror(fp)) {
		(void) fprintf(stderr, "%s: Error reading ", progname);
		(void) perror(filename);
		(void) exit(EXIT_FAILURE);
	}
	if (fp != stdin && fclose(fp)) {
		(void) fprintf(stderr, "%s: Error closing ", progname);
		(void) perror(filename);
		(void) exit(EXIT_FAILURE);
	}
	if (wantcont)
		error("expected continuation line not found");
}

/*
** Convert a string of one of the forms
**	h	-h 	hh:mm	-hh:mm	hh:mm:ss	-hh:mm:ss
** into a number of seconds.
** A null string maps to zero.
** Call error with errstring and return zero on errors.
*/

static long
gethms(string, errstring, signable)
char *		string;
const char * const	errstring;
const int		signable;
{
	int	hh, mm, ss, sign;

	if (string == NULL || *string == '\0')
		return 0;
	if (!signable)
		sign = 1;
	else if (*string == '-') {
		sign = -1;
		++string;
	} else	sign = 1;
	if (sscanf(string, scheck(string, "%d"), &hh) == 1)
		mm = ss = 0;
	else if (sscanf(string, scheck(string, "%d:%d"), &hh, &mm) == 2)
		ss = 0;
	else if (sscanf(string, scheck(string, "%d:%d:%d"),
		&hh, &mm, &ss) != 3) {
			error(errstring);
			return 0;
	}
	if (hh < 0 || hh >= HOURSPERDAY ||
		mm < 0 || mm >= MINSPERHOUR ||
		ss < 0 || ss > SECSPERMIN) {
			error(errstring);
			return 0;
	}
	return eitol(sign) *
		(eitol(hh * MINSPERHOUR + mm) *
		eitol(SECSPERMIN) + eitol(ss));
}

static void
inrule(fields, nfields)
register char ** const	fields;
const int		nfields;
{
	static struct rule	r;

	if (nfields != RULE_FIELDS) {
		error("wrong number of fields on Rule line");
		return;
	}
	if (*fields[RF_NAME] == '\0') {
		error("nameless rule");
		return;
	}
	r.r_filename = filename;
	r.r_linenum = linenum;
	r.r_stdoff = gethms(fields[RF_STDOFF], "invalid saved time", TRUE);
	rulesub(&r, fields[RF_LOYEAR], fields[RF_HIYEAR], fields[RF_COMMAND],
		fields[RF_MONTH], fields[RF_DAY], fields[RF_TOD]);
	r.r_name = ecpyalloc(fields[RF_NAME]);
	r.r_abbrvar = ecpyalloc(fields[RF_ABBRVAR]);
	rules = (struct rule *) erealloc((char *) rules,
		(int) ((nrules + 1) * sizeof *rules));
	rules[nrules++] = r;
}

static int
inzone(fields, nfields)
register char ** const	fields;
const int		nfields;
{
	register int	i;
	char		buf[132];

	if (nfields < ZONE_MINFIELDS || nfields > ZONE_MAXFIELDS) {
		error("wrong number of fields on Zone line");
		return FALSE;
	}
	if (strcmp(fields[ZF_NAME], TZDEFAULT) == 0 && lcltime != NULL) {
		(void) sprintf(buf,
			"\"Zone %s\" line and -l option are mutually exclusive",
			TZDEFAULT);
		error(buf);
		return FALSE;
	}
	if (strcmp(fields[ZF_NAME], TZDEFRULES) == 0 && psxrules != NULL) {
		(void) sprintf(buf,
			"\"Zone %s\" line and -p option are mutually exclusive",
			TZDEFRULES);
		error(buf);
		return FALSE;
	}
	for (i = 0; i < nzones; ++i)
		if (zones[i].z_name != NULL &&
			strcmp(zones[i].z_name, fields[ZF_NAME]) == 0) {
				(void) sprintf(buf,
"duplicate zone name %s (file \"%s\", line %d)",
					fields[ZF_NAME],
					zones[i].z_filename,
					zones[i].z_linenum);
				error(buf);
				return FALSE;
		}
	return inzsub(fields, nfields, FALSE);
}

static int
inzcont(fields, nfields)
register char ** const	fields;
const int		nfields;
{
	if (nfields < ZONEC_MINFIELDS || nfields > ZONEC_MAXFIELDS) {
		error("wrong number of fields on Zone continuation line");
		return FALSE;
	}
	return inzsub(fields, nfields, TRUE);
}

static int
inzsub(fields, nfields, iscont)
register char ** const	fields;
const int		nfields;
const int		iscont;
{
	register char *		cp;
	static struct zone	z;
	register int		i_gmtoff, i_rule, i_format;
	register int		i_untilyear, i_untilmonth;
	register int		i_untilday, i_untiltime;
	register int		hasuntil;

	if (iscont) {
		i_gmtoff = ZFC_GMTOFF;
		i_rule = ZFC_RULE;
		i_format = ZFC_FORMAT;
		i_untilyear = ZFC_TILYEAR;
		i_untilmonth = ZFC_TILMONTH;
		i_untilday = ZFC_TILDAY;
		i_untiltime = ZFC_TILTIME;
		z.z_name = NULL;
	} else {
		i_gmtoff = ZF_GMTOFF;
		i_rule = ZF_RULE;
		i_format = ZF_FORMAT;
		i_untilyear = ZF_TILYEAR;
		i_untilmonth = ZF_TILMONTH;
		i_untilday = ZF_TILDAY;
		i_untiltime = ZF_TILTIME;
		z.z_name = ecpyalloc(fields[ZF_NAME]);
	}
	z.z_filename = filename;
	z.z_linenum = linenum;
	z.z_gmtoff = gethms(fields[i_gmtoff], "invalid GMT offset", TRUE);
	if ((cp = strchr(fields[i_format], '%')) != 0) {
		if (*++cp != 's' || strchr(cp, '%') != 0) {
			error("invalid abbreviation format");
			return FALSE;
		}
	}
	z.z_rule = ecpyalloc(fields[i_rule]);
	z.z_format = ecpyalloc(fields[i_format]);
	hasuntil = nfields > i_untilyear;
	if (hasuntil) {
		z.z_untilrule.r_filename = filename;
		z.z_untilrule.r_linenum = linenum;
		rulesub(&z.z_untilrule,
			fields[i_untilyear],
			"only",
			"",
			(nfields > i_untilmonth) ? fields[i_untilmonth] : "Jan",
			(nfields > i_untilday) ? fields[i_untilday] : "1",
			(nfields > i_untiltime) ? fields[i_untiltime] : "0");
		z.z_untiltime = rpytime(&z.z_untilrule, z.z_untilrule.r_loyear);
		if (iscont && nzones > 0 && z.z_untiltime < max_time &&
			z.z_untiltime > min_time &&
			zones[nzones - 1].z_untiltime >= z.z_untiltime) {
error("Zone continuation line end time is not after end time of previous line");
			return FALSE;
		}
	}
	zones = (struct zone *) erealloc((char *) zones,
		(int) ((nzones + 1) * sizeof *zones));
	zones[nzones++] = z;
	/*
	** If there was an UNTIL field on this line,
	** there's more information about the zone on the next line.
	*/
	return hasuntil;
}

static void
inleap(fields, nfields)
register char ** const	fields;
const int		nfields;
{
	register const char *		cp;
	register const struct lookup *	lp;
	register int			i, j;
	int				year, month, day;
	long				dayoff, tod;
	time_t				t;

	if (nfields != LEAP_FIELDS) {
		error("wrong number of fields on Leap line");
		return;
	}
	dayoff = 0;
	cp = fields[LP_YEAR];
	if (sscanf((char *)cp, scheck(cp, "%d"), &year) != 1 ||
		year < min_year || year > max_year) {
			/*
			 * Leapin' Lizards!
			 */
			error("invalid leaping year");
			return;
	}
	j = EPOCH_YEAR;
	while (j != year) {
		if (year > j) {
			i = len_years[isleap(j)];
			++j;
		} else {
			--j;
			i = -len_years[isleap(j)];
		}
		dayoff = oadd(dayoff, eitol(i));
	}
	if ((lp = byword(fields[LP_MONTH], mon_names)) == NULL) {
		error("invalid month name");
		return;
	}
	month = lp->l_value;
	j = TM_JANUARY;
	while (j != month) {
		i = len_months[isleap(year)][j];
		dayoff = oadd(dayoff, eitol(i));
		++j;
	}
	cp = fields[LP_DAY];
	if (sscanf((char *)cp, scheck(cp, "%d"), &day) != 1 ||
		day <= 0 || day > len_months[isleap(year)][month]) {
			error("invalid day of month");
			return;
	}
	dayoff = oadd(dayoff, eitol(day - 1));
	if (dayoff < 0 && !tt_signed) {
		error("time before zero");
		return;
	}
	t = (time_t) dayoff * SECSPERDAY;
	/*
	** Cheap overflow check.
	*/
	if (t / SECSPERDAY != dayoff) {
		error("time overflow");
		return;
	}
	tod = gethms(fields[LP_TIME], "invalid time of day", FALSE);
	cp = fields[LP_CORR];
	if (strcmp(cp, "+") != 0 && strcmp(cp, "") != 0) {
		/* infile() turned "-" into "" */
		error("illegal CORRECTION field on Leap line");
		return;
	}
	if ((lp = byword(fields[LP_ROLL], leap_types)) == NULL) {
		error("illegal Rolling/Stationary field on Leap line");
		return;
	}
	addleap(tadd(t, tod), *cp == '+', lp->l_value);
}

static void
inlink(fields, nfields)
register char ** const	fields;
const int		nfields;
{
	struct link	l;

	if (nfields != LINK_FIELDS) {
		error("wrong number of fields on Link line");
		return;
	}
	if (*fields[LF_FROM] == '\0') {
		error("blank FROM field on Link line");
		return;
	}
	if (*fields[LF_TO] == '\0') {
		error("blank TO field on Link line");
		return;
	}
	l.l_filename = filename;
	l.l_linenum = linenum;
	l.l_from = ecpyalloc(fields[LF_FROM]);
	l.l_to = ecpyalloc(fields[LF_TO]);
	links = (struct link *) erealloc((char *) links,
		(int) ((nlinks + 1) * sizeof *links));
	links[nlinks++] = l;
}

static void
rulesub(rp, loyearp, hiyearp, typep, monthp, dayp, timep)
register struct rule * const	rp;
char * const			loyearp;
char * const			hiyearp;
char * const			typep;
char * const			monthp;
char * const			dayp;
char * const			timep;
{
	register struct lookup const *	lp;
	register char *			cp;

	if ((lp = byword(monthp, mon_names)) == NULL) {
		error("invalid month name");
		return;
	}
	rp->r_month = lp->l_value;
	rp->r_todisstd = FALSE;
	cp = timep;
	if (*cp != '\0') {
		cp += strlen(cp) - 1;
		switch (lowerit(*cp)) {
			case 's':
				rp->r_todisstd = TRUE;
				*cp = '\0';
				break;
			case 'w':
				rp->r_todisstd = FALSE;
				*cp = '\0';
				break;
		}
	}
	rp->r_tod = gethms(timep, "invalid time of day", FALSE);
	/*
	** Year work.
	*/
	cp = loyearp;
	if ((lp = byword(cp, begin_years)) != NULL) switch ((int) lp->l_value) {
		case YR_MINIMUM:
			rp->r_loyear = min_year;
			break;
		case YR_MAXIMUM:
			rp->r_loyear = max_year;
			break;
		default:	/* "cannot happen" */
			(void) fprintf(stderr,
				"%s: panic: Invalid l_value %d\n",
				progname, lp->l_value);
			(void) exit(EXIT_FAILURE);
	} else if (sscanf(cp, scheck(cp, "%d"), &rp->r_loyear) != 1 ||
		rp->r_loyear < min_year || rp->r_loyear > max_year) {
			if (noise)
				error("invalid starting year");
			if (rp->r_loyear > max_year)
				return;
	}
	cp = hiyearp;
	if ((lp = byword(cp, end_years)) != NULL) switch ((int) lp->l_value) {
		case YR_MINIMUM:
			rp->r_hiyear = min_year;
			break;
		case YR_MAXIMUM:
			rp->r_hiyear = max_year;
			break;
		case YR_ONLY:
			rp->r_hiyear = rp->r_loyear;
			break;
		default:	/* "cannot happen" */
			(void) fprintf(stderr,
				"%s: panic: Invalid l_value %d\n",
				progname, lp->l_value);
			(void) exit(EXIT_FAILURE);
	} else if (sscanf(cp, scheck(cp, "%d"), &rp->r_hiyear) != 1 ||
		rp->r_hiyear < min_year || rp->r_hiyear > max_year) {
			if (noise)
				error("invalid ending year");
			if (rp->r_hiyear < min_year)
				return;
	}
	if (rp->r_hiyear < min_year)
 		return;
 	if (rp->r_loyear < min_year)
 		rp->r_loyear = min_year;
 	if (rp->r_hiyear > max_year)
 		rp->r_hiyear = max_year;
	if (rp->r_loyear > rp->r_hiyear) {
		error("starting year greater than ending year");
		return;
	}
	if (*typep == '\0')
		rp->r_yrtype = NULL;
	else {
		if (rp->r_loyear == rp->r_hiyear) {
			error("typed single year");
			return;
		}
		rp->r_yrtype = ecpyalloc(typep);
	}
	/*
	** Day work.
	** Accept things such as:
	**	1
	**	last-Sunday
	**	Sun<=20
	**	Sun>=7
	*/
	if ((lp = byword(dayp, lasts)) != NULL) {
		rp->r_dycode = DC_DOWLEQ;
		rp->r_wday = lp->l_value;
		rp->r_dayofmonth = len_months[1][rp->r_month];
	} else {
		if ((cp = strchr(dayp, '<')) != 0)
			rp->r_dycode = DC_DOWLEQ;
		else if ((cp = strchr(dayp, '>')) != 0)
			rp->r_dycode = DC_DOWGEQ;
		else {
			cp = dayp;
			rp->r_dycode = DC_DOM;
		}
		if (rp->r_dycode != DC_DOM) {
			*cp++ = 0;
			if (*cp++ != '=') {
				error("invalid day of month");
				return;
			}
			if ((lp = byword(dayp, wday_names)) == NULL) {
				error("invalid weekday name");
				return;
			}
			rp->r_wday = lp->l_value;
		}
		if (sscanf(cp, scheck(cp, "%d"), &rp->r_dayofmonth) != 1 ||
			rp->r_dayofmonth <= 0 ||
			(rp->r_dayofmonth > len_months[1][rp->r_month])) {
				error("invalid day of month");
				return;
		}
	}
}

static void
convert(val, buf)
const long	val;
char * const	buf;
{
	register int	i;
	register long	shift;

	for (i = 0, shift = 24; i < 4; ++i, shift -= 8)
		buf[i] = val >> shift;
}

static void
puttzcode(val, fp)
const long	val;
FILE * const	fp;
{
	char	buf[4];

	convert(val, buf);
	(void) fwrite((void *) buf, (size_t) sizeof buf, (size_t) 1, fp);
}

static void
writezone(name)
const char * const	name;
{
	register FILE *		fp;
	register int		i, j;
	char			fullname[BUFSIZ];
	static struct tzhead	tzh;

	if (strlen(directory) + 1 + strlen(name) >= sizeof fullname) {
		(void) fprintf(stderr,
			"%s: File name %s/%s too long\n", progname,
			directory, name);
		(void) exit(EXIT_FAILURE);
	}
	(void) sprintf(fullname, "%s/%s", directory, name);
	if ((fp = fopen(fullname, "wb")) == NULL) {
		if (mkdirs(fullname) != 0)
			(void) exit(EXIT_FAILURE);
		if ((fp = fopen(fullname, "wb")) == NULL) {
			(void) fprintf(stderr, "%s: Can't create ", progname);