[unix-history] / usr / src / lib / libc / gen / ctime.c

/*
 * Copyright (c) 1987 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ctime.c	5.11 (Berkeley) %G%";
#endif LIBC_SCCS and not lint

#include "sys/param.h"
#include "sys/time.h"
#include "tzfile.h"

char *
ctime(t)
time_t *t;
{
	struct tm	*localtime();
	char	*asctime();

	return(asctime(localtime(t)));
}

/*
** A la X3J11
*/

char *
asctime(timeptr)
register struct tm *	timeptr;
{
	static char	wday_name[DAYS_PER_WEEK][3] = {
		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
	};
	static char	mon_name[MONS_PER_YEAR][3] = {
		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
	};
	static char	result[26];

	(void) sprintf(result, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
		wday_name[timeptr->tm_wday],
		mon_name[timeptr->tm_mon],
		timeptr->tm_mday, timeptr->tm_hour,
		timeptr->tm_min, timeptr->tm_sec,
		TM_YEAR_BASE + timeptr->tm_year);
	return result;
}

#ifndef TRUE
#define TRUE		1
#define FALSE		0
#endif /* !TRUE */

extern char *		getenv();
extern char *		strcpy();
extern char *		strcat();
struct tm *		offtime();

struct ttinfo {				/* time type information */
	long		tt_gmtoff;	/* GMT offset in seconds */
	int		tt_isdst;	/* used to set tm_isdst */
	int		tt_abbrind;	/* abbreviation list index */
};

struct state {
	int		timecnt;
	int		typecnt;
	int		charcnt;
	time_t		ats[TZ_MAX_TIMES];
	unsigned char	types[TZ_MAX_TIMES];
	struct ttinfo	ttis[TZ_MAX_TYPES];
	char		chars[TZ_MAX_CHARS + 1];
};

static struct state	s;

static int		tz_is_set;

char *			tzname[2] = {
	"GMT",
	"GMT"
};

#ifdef USG_COMPAT
time_t			timezone = 0;
int			daylight = 0;
#endif /* USG_COMPAT */

static long
detzcode(codep)
char *	codep;
{
	register long	result;
	register int	i;

	result = 0;
	for (i = 0; i < 4; ++i)
		result = (result << 8) | (codep[i] & 0xff);
	return result;
}

static
tzload(name)
register char *	name;
{
	register int	i;
	register int	fid;

	if (name == 0 && (name = TZDEFAULT) == 0)
		return -1;
	{
		register char *	p;
		register int	doaccess;
		char		fullname[MAXPATHLEN];

		doaccess = name[0] == '/';
		if (!doaccess) {
			if ((p = TZDIR) == 0)
				return -1;
			if ((strlen(p) + strlen(name) + 1) >= sizeof fullname)
				return -1;
			(void) strcpy(fullname, p);
			(void) strcat(fullname, "/");
			(void) strcat(fullname, name);
			/*
			** Set doaccess if '.' (as in "../") shows up in name.
			*/
			while (*name != '\0')
				if (*name++ == '.')
					doaccess = TRUE;
			name = fullname;
		}
		if (doaccess && access(name, 4) != 0)
			return -1;
		if ((fid = open(name, 0)) == -1)
			return -1;
	}
	{
		register char *			p;
		register struct tzhead *	tzhp;
		char				buf[sizeof s];

		i = read(fid, buf, sizeof buf);
		if (close(fid) != 0 || i < sizeof *tzhp)
			return -1;
		tzhp = (struct tzhead *) buf;
		s.timecnt = (int) detzcode(tzhp->tzh_timecnt);
		s.typecnt = (int) detzcode(tzhp->tzh_typecnt);
		s.charcnt = (int) detzcode(tzhp->tzh_charcnt);
		if (s.timecnt > TZ_MAX_TIMES ||
			s.typecnt == 0 ||
			s.typecnt > TZ_MAX_TYPES ||
			s.charcnt > TZ_MAX_CHARS)
				return -1;
		if (i < sizeof *tzhp +
			s.timecnt * (4 + sizeof (char)) +
			s.typecnt * (4 + 2 * sizeof (char)) +
			s.charcnt * sizeof (char))
				return -1;
		p = buf + sizeof *tzhp;
		for (i = 0; i < s.timecnt; ++i) {
			s.ats[i] = detzcode(p);
			p += 4;
		}
		for (i = 0; i < s.timecnt; ++i)
			s.types[i] = (unsigned char) *p++;
		for (i = 0; i < s.typecnt; ++i) {
			register struct ttinfo *	ttisp;

			ttisp = &s.ttis[i];
			ttisp->tt_gmtoff = detzcode(p);
			p += 4;
			ttisp->tt_isdst = (unsigned char) *p++;
			ttisp->tt_abbrind = (unsigned char) *p++;
		}
		for (i = 0; i < s.charcnt; ++i)
			s.chars[i] = *p++;
		s.chars[i] = '\0';	/* ensure '\0' at end */
	}
	/*
	** Check that all the local time type indices are valid.
	*/
	for (i = 0; i < s.timecnt; ++i)
		if (s.types[i] >= s.typecnt)
			return -1;
	/*
	** Check that all abbreviation indices are valid.
	*/
	for (i = 0; i < s.typecnt; ++i)
		if (s.ttis[i].tt_abbrind >= s.charcnt)
			return -1;
	/*
	** Set tzname elements to initial values.
	*/
	tzname[0] = tzname[1] = &s.chars[0];
#ifdef USG_COMPAT
	timezone = -s.ttis[0].tt_gmtoff;
	daylight = 0;
#endif /* USG_COMPAT */
	for (i = 1; i < s.typecnt; ++i) {
		register struct ttinfo *	ttisp;

		ttisp = &s.ttis[i];
		if (ttisp->tt_isdst) {
			tzname[1] = &s.chars[ttisp->tt_abbrind];
#ifdef USG_COMPAT
			daylight = 1;
#endif /* USG_COMPAT */ 
		} else {
			tzname[0] = &s.chars[ttisp->tt_abbrind];
#ifdef USG_COMPAT
			timezone = -ttisp->tt_gmtoff;
#endif /* USG_COMPAT */ 
		}
	}
	return 0;
}

static
tzsetkernel()
{
	struct timeval	tv;
	struct timezone	tz;
	char	*_tztab();

	if (gettimeofday(&tv, &tz))
		return -1;
	s.timecnt = 0;		/* UNIX counts *west* of Greenwich */
	s.ttis[0].tt_gmtoff = tz.tz_minuteswest * -SECS_PER_MIN;
	s.ttis[0].tt_abbrind = 0;
	(void)strcpy(s.chars, _tztab(tz.tz_minuteswest, 0));
	tzname[0] = tzname[1] = s.chars;
#ifdef USG_COMPAT
	timezone = tz.tz_minuteswest * 60;
	daylight = tz.tz_dsttime;
#endif /* USG_COMPAT */
	return 0;
}

static
tzsetgmt()
{
	s.timecnt = 0;
	s.ttis[0].tt_gmtoff = 0;
	s.ttis[0].tt_abbrind = 0;
	(void) strcpy(s.chars, "GMT");
	tzname[0] = tzname[1] = s.chars;
#ifdef USG_COMPAT
	timezone = 0;
	daylight = 0;
#endif /* USG_COMPAT */
}

void
tzset()
{
	register char *	name;

	tz_is_set = TRUE;
	name = getenv("TZ");
	if (!name || *name) {			/* did not request GMT */
		if (name && !tzload(name))	/* requested name worked */
			return;
		if (!tzload((char *)0))		/* default name worked */
			return;
		if (!tzsetkernel())		/* kernel guess worked */
			return;
	}
	tzsetgmt();				/* GMT is default */
}

struct tm *
localtime(timep)
time_t *	timep;
{
	register struct ttinfo *	ttisp;
	register struct tm *		tmp;
	register int			i;
	time_t				t;

	if (!tz_is_set)
		(void) tzset();
	t = *timep;
	if (s.timecnt == 0 || t < s.ats[0]) {
		i = 0;
		while (s.ttis[i].tt_isdst)
			if (++i >= s.timecnt) {
				i = 0;
				break;
			}
	} else {
		for (i = 1; i < s.timecnt; ++i)
			if (t < s.ats[i])
				break;
		i = s.types[i - 1];
	}
	ttisp = &s.ttis[i];
	/*
	** To get (wrong) behavior that's compatible with System V Release 2.0
	** you'd replace the statement below with
	**	tmp = offtime((time_t) (t + ttisp->tt_gmtoff), 0L);
	*/
	tmp = offtime(&t, ttisp->tt_gmtoff);
	tmp->tm_isdst = ttisp->tt_isdst;
	tzname[tmp->tm_isdst] = &s.chars[ttisp->tt_abbrind];
	tmp->tm_zone = &s.chars[ttisp->tt_abbrind];
	return tmp;
}

struct tm *
gmtime(clock)
time_t *	clock;
{
	register struct tm *	tmp;

	tmp = offtime(clock, 0L);
	tzname[0] = "GMT";
	tmp->tm_zone = "GMT";		/* UCT ? */
	return tmp;
}

static int	mon_lengths[2][MONS_PER_YEAR] = {
	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31,
	31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};

static int	year_lengths[2] = {
	DAYS_PER_NYEAR, DAYS_PER_LYEAR
};

struct tm *
offtime(clock, offset)
time_t *	clock;
long		offset;
{
	register struct tm *	tmp;
	register long		days;
	register long		rem;
	register int		y;
	register int		yleap;
	register int *		ip;
	static struct tm	tm;

	tmp = &tm;
	days = *clock / SECS_PER_DAY;
	rem = *clock % SECS_PER_DAY;
	rem += offset;
	while (rem < 0) {
		rem += SECS_PER_DAY;
		--days;
	}
	while (rem >= SECS_PER_DAY) {
		rem -= SECS_PER_DAY;
		++days;
	}
	tmp->tm_hour = (int) (rem / SECS_PER_HOUR);
	rem = rem % SECS_PER_HOUR;
	tmp->tm_min = (int) (rem / SECS_PER_MIN);
	tmp->tm_sec = (int) (rem % SECS_PER_MIN);
	tmp->tm_wday = (int) ((EPOCH_WDAY + days) % DAYS_PER_WEEK);
	if (tmp->tm_wday < 0)
		tmp->tm_wday += DAYS_PER_WEEK;
	y = EPOCH_YEAR;
	if (days >= 0)
		for ( ; ; ) {
			yleap = isleap(y);
			if (days < (long) year_lengths[yleap])
				break;
			++y;
			days = days - (long) year_lengths[yleap];
		}
	else do {
		--y;
		yleap = isleap(y);
		days = days + (long) year_lengths[yleap];
	} while (days < 0);
	tmp->tm_year = y - TM_YEAR_BASE;
	tmp->tm_yday = (int) days;
	ip = mon_lengths[yleap];
	for (tmp->tm_mon = 0; days >= (long) ip[tmp->tm_mon]; ++(tmp->tm_mon))
		days = days - (long) ip[tmp->tm_mon];
	tmp->tm_mday = (int) (days + 1);
	tmp->tm_isdst = 0;
	tmp->tm_zone = "";
	tmp->tm_gmtoff = offset;
	return tmp;
}
Commit	Line	Data
b8f253e8	1	/*
5d10bbb4	2	* Copyright (c) 1987 Regents of the University of California.
b8f253e8 KM	3	* All rights reserved. The Berkeley software License Agreement
	4	* specifies the terms and conditions for redistribution.
	5	*/
	6
f60731f0	7	#if defined(LIBC_SCCS) && !defined(lint)
689df48b	8	static char sccsid[] = "@(#)ctime.c 5.11 (Berkeley) %G%";
f60731f0	9	#endif LIBC_SCCS and not lint
b8f253e8	10
e747b257	11	#include "sys/param.h"
5d10bbb4	12	#include "sys/time.h"
e747b257	13	#include "tzfile.h"
674afc9d	14
e747b257 KB	15	char *
	16	ctime(t)
	17	time_t *t;
674afc9d	18	{
e747b257 KB	19	struct tm *localtime();
	20	char *asctime();
	21
	22	return(asctime(localtime(t)));
	23	}
674afc9d BJ	24
674afc9d BJ	25	/*
e747b257 KB	26	** A la X3J11
e747b257 KB	27	*/
bdea7503	28
e747b257 KB	29	char *
	30	asctime(timeptr)
	31	register struct tm * timeptr;
	32	{
	33	static char wday_name[DAYS_PER_WEEK][3] = {
	34	"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
	35	};
	36	static char mon_name[MONS_PER_YEAR][3] = {
	37	"Jan", "Feb", "Mar", "Apr", "May", "Jun",
	38	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
	39	};
	40	static char result[26];
bdea7503	41
36ce8be7	42	(void) sprintf(result, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
e747b257 KB	43	wday_name[timeptr->tm_wday],
	44	mon_name[timeptr->tm_mon],
	45	timeptr->tm_mday, timeptr->tm_hour,
	46	timeptr->tm_min, timeptr->tm_sec,
	47	TM_YEAR_BASE + timeptr->tm_year);
	48	return result;
	49	}
7f253f66	50
e747b257 KB	51	#ifndef TRUE
	52	#define TRUE 1
	53	#define FALSE 0
	54	#endif /* !TRUE */
	55
	56	extern char * getenv();
	57	extern char * strcpy();
	58	extern char * strcat();
	59	struct tm * offtime();
	60
	61	struct ttinfo { /* time type information */
	62	long tt_gmtoff; /* GMT offset in seconds */
	63	int tt_isdst; /* used to set tm_isdst */
	64	int tt_abbrind; /* abbreviation list index */
4e884c92 RE	65	};
4e884c92 RE	66
e747b257 KB	67	struct state {
	68	int timecnt;
	69	int typecnt;
	70	int charcnt;
	71	time_t ats[TZ_MAX_TIMES];
	72	unsigned char types[TZ_MAX_TIMES];
	73	struct ttinfo ttis[TZ_MAX_TYPES];
	74	char chars[TZ_MAX_CHARS + 1];
7f253f66 SL	75	};
7f253f66 SL	76
e747b257 KB	77	static struct state s;
	78
	79	static int tz_is_set;
	80
	81	char * tzname[2] = {
	82	"GMT",
	83	"GMT"
674afc9d BJ	84	};
674afc9d BJ	85
e747b257 KB	86	#ifdef USG_COMPAT
	87	time_t timezone = 0;
	88	int daylight = 0;
	89	#endif /* USG_COMPAT */
674afc9d	90
e747b257 KB	91	static long
	92	detzcode(codep)
	93	char * codep;
674afc9d	94	{
e747b257 KB	95	register long result;
e747b257 KB	96	register int i;
674afc9d	97
e747b257 KB	98	result = 0;
	99	for (i = 0; i < 4; ++i)
	100	result = (result << 8) \| (codep[i] & 0xff);
	101	return result;
674afc9d BJ	102	}
674afc9d BJ	103
674afc9d	104	static
e747b257 KB	105	tzload(name)
e747b257 KB	106	register char * name;
674afc9d	107	{
e747b257 KB	108	register int i;
e747b257 KB	109	register int fid;
674afc9d	110
e747b257 KB	111	if (name == 0 && (name = TZDEFAULT) == 0)
	112	return -1;
	113	{
	114	register char * p;
	115	register int doaccess;
	116	char fullname[MAXPATHLEN];
674afc9d	117
e747b257 KB	118	doaccess = name[0] == '/';
	119	if (!doaccess) {
	120	if ((p = TZDIR) == 0)
	121	return -1;
	122	if ((strlen(p) + strlen(name) + 1) >= sizeof fullname)
	123	return -1;
	124	(void) strcpy(fullname, p);
	125	(void) strcat(fullname, "/");
	126	(void) strcat(fullname, name);
	127	/*
	128	** Set doaccess if '.' (as in "../") shows up in name.
	129	*/
	130	while (*name != '\0')
	131	if (*name++ == '.')
	132	doaccess = TRUE;
	133	name = fullname;
	134	}
	135	if (doaccess && access(name, 4) != 0)
	136	return -1;
	137	if ((fid = open(name, 0)) == -1)
	138	return -1;
674afc9d	139	}
e747b257 KB	140	{
	141	register char * p;
	142	register struct tzhead * tzhp;
	143	char buf[sizeof s];
674afc9d	144
e747b257 KB	145	i = read(fid, buf, sizeof buf);
	146	if (close(fid) != 0 \|\| i < sizeof *tzhp)
	147	return -1;
	148	tzhp = (struct tzhead *) buf;
	149	s.timecnt = (int) detzcode(tzhp->tzh_timecnt);
	150	s.typecnt = (int) detzcode(tzhp->tzh_typecnt);
	151	s.charcnt = (int) detzcode(tzhp->tzh_charcnt);
	152	if (s.timecnt > TZ_MAX_TIMES \|\|
	153	s.typecnt == 0 \|\|
	154	s.typecnt > TZ_MAX_TYPES \|\|
	155	s.charcnt > TZ_MAX_CHARS)
	156	return -1;
	157	if (i < sizeof *tzhp +
	158	s.timecnt * (4 + sizeof (char)) +
	159	s.typecnt * (4 + 2 * sizeof (char)) +
	160	s.charcnt * sizeof (char))
	161	return -1;
	162	p = buf + sizeof *tzhp;
	163	for (i = 0; i < s.timecnt; ++i) {
	164	s.ats[i] = detzcode(p);
	165	p += 4;
	166	}
	167	for (i = 0; i < s.timecnt; ++i)
	168	s.types[i] = (unsigned char) *p++;
	169	for (i = 0; i < s.typecnt; ++i) {
	170	register struct ttinfo * ttisp;
674afc9d	171
e747b257 KB	172	ttisp = &s.ttis[i];
	173	ttisp->tt_gmtoff = detzcode(p);
	174	p += 4;
	175	ttisp->tt_isdst = (unsigned char) *p++;
	176	ttisp->tt_abbrind = (unsigned char) *p++;
	177	}
	178	for (i = 0; i < s.charcnt; ++i)
	179	s.chars[i] = *p++;
	180	s.chars[i] = '\0'; /* ensure '\0' at end */
	181	}
	182	/*
	183	** Check that all the local time type indices are valid.
	184	*/
	185	for (i = 0; i < s.timecnt; ++i)
	186	if (s.types[i] >= s.typecnt)
	187	return -1;
674afc9d	188	/*
e747b257 KB	189	** Check that all abbreviation indices are valid.
	190	*/
	191	for (i = 0; i < s.typecnt; ++i)
	192	if (s.ttis[i].tt_abbrind >= s.charcnt)
	193	return -1;
	194	/*
	195	** Set tzname elements to initial values.
	196	*/
	197	tzname[0] = tzname[1] = &s.chars[0];
	198	#ifdef USG_COMPAT
689df48b	199	timezone = -s.ttis[0].tt_gmtoff;
e747b257 KB	200	daylight = 0;
	201	#endif /* USG_COMPAT */
	202	for (i = 1; i < s.typecnt; ++i) {
	203	register struct ttinfo * ttisp;
674afc9d	204
e747b257 KB	205	ttisp = &s.ttis[i];
	206	if (ttisp->tt_isdst) {
	207	tzname[1] = &s.chars[ttisp->tt_abbrind];
	208	#ifdef USG_COMPAT
	209	daylight = 1;
	210	#endif /* USG_COMPAT */
	211	} else {
	212	tzname[0] = &s.chars[ttisp->tt_abbrind];
	213	#ifdef USG_COMPAT
689df48b	214	timezone = -ttisp->tt_gmtoff;
e747b257 KB	215	#endif /* USG_COMPAT */
	216	}
	217	}
	218	return 0;
	219	}
674afc9d	220
5d10bbb4 KB	221	static
	222	tzsetkernel()
	223	{
	224	struct timeval tv;
	225	struct timezone tz;
2555d7f3	226	char *_tztab();
5d10bbb4 KB	227
	228	if (gettimeofday(&tv, &tz))
	229	return -1;
	230	s.timecnt = 0; /* UNIX counts west of Greenwich */
	231	s.ttis[0].tt_gmtoff = tz.tz_minuteswest * -SECS_PER_MIN;
	232	s.ttis[0].tt_abbrind = 0;
2555d7f3	233	(void)strcpy(s.chars, _tztab(tz.tz_minuteswest, 0));
5d10bbb4 KB	234	tzname[0] = tzname[1] = s.chars;
	235	#ifdef USG_COMPAT
	236	timezone = tz.tz_minuteswest * 60;
	237	daylight = tz.tz_dsttime;
	238	#endif /* USG_COMPAT */
	239	return 0;
	240	}
	241
e747b257 KB	242	static
	243	tzsetgmt()
	244	{
	245	s.timecnt = 0;
	246	s.ttis[0].tt_gmtoff = 0;
	247	s.ttis[0].tt_abbrind = 0;
	248	(void) strcpy(s.chars, "GMT");
	249	tzname[0] = tzname[1] = s.chars;
	250	#ifdef USG_COMPAT
	251	timezone = 0;
	252	daylight = 0;
	253	#endif /* USG_COMPAT */
	254	}
674afc9d	255
e747b257 KB	256	void
	257	tzset()
	258	{
	259	register char * name;
	260
	261	tz_is_set = TRUE;
	262	name = getenv("TZ");
5d10bbb4 KB	263	if (!name \|\| name) { / did not request GMT */
	264	if (name && !tzload(name)) /* requested name worked */
	265	return;
	266	if (!tzload((char )0)) / default name worked */
	267	return;
	268	if (!tzsetkernel()) /* kernel guess worked */
	269	return;
	270	}
	271	tzsetgmt(); /* GMT is default */
674afc9d BJ	272	}
674afc9d BJ	273
e747b257 KB	274	struct tm *
	275	localtime(timep)
	276	time_t * timep;
674afc9d	277	{
e747b257 KB	278	register struct ttinfo * ttisp;
	279	register struct tm * tmp;
	280	register int i;
	281	time_t t;
	282
	283	if (!tz_is_set)
	284	(void) tzset();
	285	t = *timep;
	286	if (s.timecnt == 0 \|\| t < s.ats[0]) {
	287	i = 0;
	288	while (s.ttis[i].tt_isdst)
	289	if (++i >= s.timecnt) {
	290	i = 0;
	291	break;
	292	}
	293	} else {
	294	for (i = 1; i < s.timecnt; ++i)
	295	if (t < s.ats[i])
	296	break;
	297	i = s.types[i - 1];
674afc9d	298	}
e747b257 KB	299	ttisp = &s.ttis[i];
	300	/*
	301	** To get (wrong) behavior that's compatible with System V Release 2.0
	302	** you'd replace the statement below with
	303	** tmp = offtime((time_t) (t + ttisp->tt_gmtoff), 0L);
	304	*/
	305	tmp = offtime(&t, ttisp->tt_gmtoff);
	306	tmp->tm_isdst = ttisp->tt_isdst;
	307	tzname[tmp->tm_isdst] = &s.chars[ttisp->tt_abbrind];
	308	tmp->tm_zone = &s.chars[ttisp->tt_abbrind];
	309	return tmp;
674afc9d BJ	310	}
674afc9d BJ	311
e747b257 KB	312	struct tm *
	313	gmtime(clock)
	314	time_t * clock;
674afc9d	315	{
e747b257 KB	316	register struct tm * tmp;
	317
	318	tmp = offtime(clock, 0L);
	319	tzname[0] = "GMT";
	320	tmp->tm_zone = "GMT"; /* UCT ? */
	321	return tmp;
674afc9d BJ	322	}
674afc9d BJ	323
e747b257 KB	324	static int mon_lengths[2][MONS_PER_YEAR] = {
	325	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31,
	326	31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
	327	};
	328
	329	static int year_lengths[2] = {
	330	DAYS_PER_NYEAR, DAYS_PER_LYEAR
	331	};
	332
	333	struct tm *
	334	offtime(clock, offset)
	335	time_t * clock;
	336	long offset;
674afc9d	337	{
e747b257 KB	338	register struct tm * tmp;
	339	register long days;
	340	register long rem;
	341	register int y;
	342	register int yleap;
	343	register int * ip;
	344	static struct tm tm;
	345
	346	tmp = &tm;
	347	days = *clock / SECS_PER_DAY;
	348	rem = *clock % SECS_PER_DAY;
	349	rem += offset;
	350	while (rem < 0) {
	351	rem += SECS_PER_DAY;
	352	--days;
	353	}
	354	while (rem >= SECS_PER_DAY) {
	355	rem -= SECS_PER_DAY;
	356	++days;
	357	}
	358	tmp->tm_hour = (int) (rem / SECS_PER_HOUR);
	359	rem = rem % SECS_PER_HOUR;
	360	tmp->tm_min = (int) (rem / SECS_PER_MIN);
	361	tmp->tm_sec = (int) (rem % SECS_PER_MIN);
	362	tmp->tm_wday = (int) ((EPOCH_WDAY + days) % DAYS_PER_WEEK);
	363	if (tmp->tm_wday < 0)
	364	tmp->tm_wday += DAYS_PER_WEEK;
	365	y = EPOCH_YEAR;
	366	if (days >= 0)
	367	for ( ; ; ) {
	368	yleap = isleap(y);
	369	if (days < (long) year_lengths[yleap])
	370	break;
	371	++y;
	372	days = days - (long) year_lengths[yleap];
	373	}
	374	else do {
	375	--y;
	376	yleap = isleap(y);
	377	days = days + (long) year_lengths[yleap];
	378	} while (days < 0);
	379	tmp->tm_year = y - TM_YEAR_BASE;
	380	tmp->tm_yday = (int) days;
	381	ip = mon_lengths[yleap];
	382	for (tmp->tm_mon = 0; days >= (long) ip[tmp->tm_mon]; ++(tmp->tm_mon))
	383	days = days - (long) ip[tmp->tm_mon];
	384	tmp->tm_mday = (int) (days + 1);
	385	tmp->tm_isdst = 0;
	386	tmp->tm_zone = "";
	387	tmp->tm_gmtoff = offset;
	388	return tmp;
674afc9d	389	}