[apple/libc.git] / stdtime / FreeBSD / strftime.c

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley. The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if 0
static const char	elsieid[] = "@(#)strftime.3	8.3";
/*
** Based on the UCB version with the ID appearing below.
** This is ANSIish only when "multibyte character == plain character".
*/
#endif

#include "xlocale_private.h"

#include "namespace.h"
#include "private.h"

#if defined(LIBC_SCCS) && !defined(lint)
static const char	sccsid[] = "@(#)strftime.c	5.4 (Berkeley) 3/14/89";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/stdtime/strftime.c,v 1.44 2009/06/09 09:02:58 delphij Exp $");

#include "tzfile.h"
#include <time.h>
#include <fcntl.h>
#include <sys/stat.h>
#include "un-namespace.h"
#include "timelocal.h"

#if !BUILDING_VARIANT
static char *	_add(const char *, char *, const char *);
static char *	_conv(int, const char *, char *, const char *, locale_t);
static char *	_yconv(int, int, int, int, char *, const char *, locale_t);
#endif
#define	_fmt	_st_fmt
__private_extern__ char *	_fmt(const char *, const struct tm *, char *, const char *,
			int *, struct lc_time_T *, locale_t);

extern char *	tzname[];
extern long __darwin_altzone;		/* DST timezone offset */
#define altzone __darwin_altzone
__private_extern__ long _st_get_timezone(void);

#ifndef YEAR_2000_NAME
#define YEAR_2000_NAME	"CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS"
#endif /* !defined YEAR_2000_NAME */

#define IN_NONE	0
#define IN_SOME	1
#define IN_THIS	2
#define IN_ALL	3

#define PAD_DEFAULT	0
#define PAD_LESS	1
#define PAD_SPACE	2
#define PAD_ZERO	3

#ifndef BUILDING_VARIANT
static const char * const fmt_padding[][4] = {
	/* DEFAULT,	LESS,	SPACE,	ZERO */
#define PAD_FMT_MONTHDAY	0
#define PAD_FMT_HMS		0
#define PAD_FMT_CENTURY		0
#define PAD_FMT_SHORTYEAR	0
#define PAD_FMT_MONTH		0
#define PAD_FMT_WEEKOFYEAR	0
#define PAD_FMT_DAYOFMONTH	0
	{ "%02d",	"%d",	"%2d",	"%02d" },
#define PAD_FMT_SDAYOFMONTH	1
#define PAD_FMT_SHMS		1
	{ "%2d",	"%d",	"%2d",	"%02d" },
#define	PAD_FMT_DAYOFYEAR	2
	{ "%03d",	"%d",	"%3d",	"%03d" },
#define PAD_FMT_YEAR		3
	{ "%04d",	"%d",	"%4d",	"%04d" }
};
#endif

#define USG_COMPAT
#define ALTZONE

size_t
strftime_l(char * __restrict s, size_t maxsize, const char * __restrict format,
    const struct tm * __restrict t, locale_t loc)
{
	char *	p;
	int	warn;

	NORMALIZE_LOCALE(loc);
	tzset();
	warn = IN_NONE;
	p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn, __get_current_time_locale(loc), loc);
#ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
	if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) {
		(void) fputs("\n", stderr);
		if (format == NULL)
			(void) fputs("NULL strftime format ", stderr);
		else	(void) fprintf_l(stderr, loc, "strftime format \"%s\" ",
				format);
		(void) fputs("yields only two digits of years in ", stderr);
		if (warn == IN_SOME)
			(void) fputs("some locales", stderr);
		else if (warn == IN_THIS)
			(void) fputs("the current locale", stderr);
		else	(void) fputs("all locales", stderr);
		(void) fputs("\n", stderr);
	}
#endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */
	if (p == s + maxsize)
		return 0;
	*p = '\0';
	return p - s;
}

size_t
strftime(char * __restrict s, size_t maxsize, const char * __restrict format,
    const struct tm * __restrict t)
{
	return strftime_l(s, maxsize, format, t, __current_locale());
}

#ifndef BUILDING_VARIANT
__private_extern__ char *
_fmt(format, t, pt, ptlim, warnp, tptr, loc)
const char *		format;
const struct tm * const	t;
char *			pt;
const char * const	ptlim;
int *			warnp;
struct lc_time_T *	tptr;
locale_t		loc;
{
	int Ealternative, Oalternative, PadIndex;

	for ( ; *format; ++format) {
		if (*format == '%') {
			Ealternative = 0;
			Oalternative = 0;
			PadIndex	 = PAD_DEFAULT;
label:
			switch (*++format) {
			case '\0':
				--format;
				break;
			case 'A':
				pt = _add((t->tm_wday < 0 ||
					t->tm_wday >= DAYSPERWEEK) ?
					"?" : tptr->weekday[t->tm_wday],
					pt, ptlim);
				continue;
			case 'a':
				pt = _add((t->tm_wday < 0 ||
					t->tm_wday >= DAYSPERWEEK) ?
					"?" : tptr->wday[t->tm_wday],
					pt, ptlim);
				continue;
			case 'B':
				pt = _add((t->tm_mon < 0 ||
					t->tm_mon >= MONSPERYEAR) ?
					"?" : (Oalternative ? tptr->alt_month :
					tptr->month)[t->tm_mon],
					pt, ptlim);
				continue;
			case 'b':
			case 'h':
				pt = _add((t->tm_mon < 0 ||
					t->tm_mon >= MONSPERYEAR) ?
					"?" : tptr->mon[t->tm_mon],
					pt, ptlim);
				continue;
			case 'C':
				/*
				** %C used to do a...
				**	_fmt("%a %b %e %X %Y", t, tptr, loc);
				** ...whereas now POSIX 1003.2 calls for
				** something completely different.
				** (ado, 1993-05-24)
				*/
				pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0,
					pt, ptlim, loc);
				continue;
			case 'c':
				{
				int warn2 = IN_SOME;

				pt = _fmt(tptr->c_fmt, t, pt, ptlim, &warn2, tptr, loc);
				if (warn2 == IN_ALL)
					warn2 = IN_THIS;
				if (warn2 > *warnp)
					*warnp = warn2;
				}
				continue;
			case 'D':
				pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp, tptr, loc);
				continue;
			case 'd':
				pt = _conv(t->tm_mday, fmt_padding[PAD_FMT_DAYOFMONTH][PadIndex],
					pt, ptlim, loc);
				continue;
			case 'E':
				if (Ealternative || Oalternative)
					break;
				Ealternative++;
				goto label;
			case 'O':
				/*
				** C99 locale modifiers.
				** The sequences
				**	%Ec %EC %Ex %EX %Ey %EY
				**	%Od %oe %OH %OI %Om %OM
				**	%OS %Ou %OU %OV %Ow %OW %Oy
				** are supposed to provide alternate
				** representations.
				**
				** FreeBSD extension
				**      %OB
				*/
				if (Ealternative || Oalternative)
					break;
				Oalternative++;
				goto label;
			case 'e':
				pt = _conv(t->tm_mday,
					fmt_padding[PAD_FMT_SDAYOFMONTH][PadIndex], pt, ptlim, loc);
				continue;
			case 'F':
				pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp, tptr, loc);
				continue;
			case 'H':
				pt = _conv(t->tm_hour, fmt_padding[PAD_FMT_HMS][PadIndex],
					pt, ptlim, loc);
				continue;
			case 'I':
				pt = _conv((t->tm_hour % 12) ?
					(t->tm_hour % 12) : 12,
					fmt_padding[PAD_FMT_HMS][PadIndex], pt, ptlim, loc);
				continue;
			case 'j':
				pt = _conv(t->tm_yday + 1,
					fmt_padding[PAD_FMT_DAYOFYEAR][PadIndex], pt, ptlim, loc);
				continue;
			case 'k':
				/*
				** This used to be...
				**	_conv(t->tm_hour % 12 ?
				**		t->tm_hour % 12 : 12, 2, ' ', loc);
				** ...and has been changed to the below to
				** match SunOS 4.1.1 and Arnold Robbins'
				** strftime version 3.0. That is, "%k" and
				** "%l" have been swapped.
				** (ado, 1993-05-24)
				*/
				pt = _conv(t->tm_hour, fmt_padding[PAD_FMT_SHMS][PadIndex],
					pt, ptlim, loc);
				continue;
#ifdef KITCHEN_SINK
			case 'K':
				/*
				** After all this time, still unclaimed!
				*/
				pt = _add("kitchen sink", pt, ptlim);
				continue;
#endif /* defined KITCHEN_SINK */
			case 'l':
				/*
				** This used to be...
				**	_conv(t->tm_hour, 2, ' ');
				** ...and has been changed to the below to
				** match SunOS 4.1.1 and Arnold Robbin's
				** strftime version 3.0. That is, "%k" and
				** "%l" have been swapped.
				** (ado, 1993-05-24)
				*/
				pt = _conv((t->tm_hour % 12) ?
					(t->tm_hour % 12) : 12,
					fmt_padding[PAD_FMT_SHMS][PadIndex], pt, ptlim, loc);
				continue;
			case 'M':
				pt = _conv(t->tm_min, fmt_padding[PAD_FMT_HMS][PadIndex],
					pt, ptlim, loc);
				continue;
			case 'm':
				pt = _conv(t->tm_mon + 1,
					fmt_padding[PAD_FMT_MONTH][PadIndex], pt, ptlim, loc);
				continue;
			case 'n':
				pt = _add("\n", pt, ptlim);
				continue;
			case 'p':
				pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ?
					tptr->pm :
					tptr->am,
					pt, ptlim);
				continue;
			case 'R':
				pt = _fmt("%H:%M", t, pt, ptlim, warnp, tptr, loc);
				continue;
			case 'r':
				pt = _fmt(tptr->ampm_fmt, t, pt, ptlim,
					warnp, tptr, loc);
				continue;
			case 'S':
				pt = _conv(t->tm_sec, fmt_padding[PAD_FMT_HMS][PadIndex],
					pt, ptlim, loc);
				continue;
			case 's':
				{
					struct tm	tm;
					char		buf[INT_STRLEN_MAXIMUM(
								time_t) + 1];
					time_t		mkt;

					tm = *t;
					mkt = mktime(&tm);
					if (TYPE_SIGNED(time_t))
						(void) sprintf_l(buf, loc, "%ld",
							(long) mkt);
					else	(void) sprintf_l(buf, loc, "%lu",
							(unsigned long) mkt);
					pt = _add(buf, pt, ptlim);
				}
				continue;
			case 'T':
				pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp, tptr, loc);
				continue;
			case 't':
				pt = _add("\t", pt, ptlim);
				continue;
			case 'U':
				pt = _conv((t->tm_yday + DAYSPERWEEK -
					t->tm_wday) / DAYSPERWEEK,
					fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex], pt, ptlim, loc);
				continue;
			case 'u':
				/*
				** From Arnold Robbins' strftime version 3.0:
				** "ISO 8601: Weekday as a decimal number
				** [1 (Monday) - 7]"
				** (ado, 1993-05-24)
				*/
				pt = _conv((t->tm_wday == 0) ?
					DAYSPERWEEK : t->tm_wday,
					"%d", pt, ptlim, loc);
				continue;
			case 'V':	/* ISO 8601 week number */
			case 'G':	/* ISO 8601 year (four digits) */
			case 'g':	/* ISO 8601 year (two digits) */
/*
** From Arnold Robbins' strftime version 3.0: "the week number of the
** year (the first Monday as the first day of week 1) as a decimal number
** (01-53)."
** (ado, 1993-05-24)
**
** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn:
** "Week 01 of a year is per definition the first week which has the
** Thursday in this year, which is equivalent to the week which contains
** the fourth day of January. In other words, the first week of a new year
** is the week which has the majority of its days in the new year. Week 01
** might also contain days from the previous year and the week before week
** 01 of a year is the last week (52 or 53) of the previous year even if
** it contains days from the new year. A week starts with Monday (day 1)
** and ends with Sunday (day 7). For example, the first week of the year
** 1997 lasts from 1996-12-30 to 1997-01-05..."
** (ado, 1996-01-02)
*/
				{
					int	year;
					int	base;
					int	yday;
					int	wday;
					int	w;

					year = t->tm_year;
					base = TM_YEAR_BASE;
					yday = t->tm_yday;
					wday = t->tm_wday;
					for ( ; ; ) {
						int	len;
						int	bot;
						int	top;

						len = isleap_sum(year, base) ?
							DAYSPERLYEAR :
							DAYSPERNYEAR;
						/*
						** What yday (-3 ... 3) does
						** the ISO year begin on?
						*/
						bot = ((yday + 11 - wday) %
							DAYSPERWEEK) - 3;
						/*
						** What yday does the NEXT
						** ISO year begin on?
						*/
						top = bot -
							(len % DAYSPERWEEK);
						if (top < -3)
							top += DAYSPERWEEK;
						top += len;
						if (yday >= top) {
							++base;
							w = 1;
							break;
						}
						if (yday >= bot) {
							w = 1 + ((yday - bot) /
								DAYSPERWEEK);
							break;
						}
						--base;
						yday += isleap_sum(year, base) ?
							DAYSPERLYEAR :
							DAYSPERNYEAR;
					}
#ifdef XPG4_1994_04_09
					if ((w == 52 &&
						t->tm_mon == TM_JANUARY) ||
						(w == 1 &&
						t->tm_mon == TM_DECEMBER))
							w = 53;
#endif /* defined XPG4_1994_04_09 */
					if (*format == 'V')
						pt = _conv(w, fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex],
							pt, ptlim, loc);
					else if (*format == 'g') {
						*warnp = IN_ALL;
						pt = _yconv(year, base, 0, 1,
							pt, ptlim, loc);
					} else	pt = _yconv(year, base, 1, 1,
							pt, ptlim, loc);
				}
				continue;
			case 'v':
				/*
				** From Arnold Robbins' strftime version 3.0:
				** "date as dd-bbb-YYYY"
				** (ado, 1993-05-24)
				*/
				pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp, tptr, loc);
				continue;
			case 'W':
				pt = _conv((t->tm_yday + DAYSPERWEEK -
					(t->tm_wday ?
					(t->tm_wday - 1) :
					(DAYSPERWEEK - 1))) / DAYSPERWEEK,
					fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex], pt, ptlim, loc);
				continue;
			case 'w':
				pt = _conv(t->tm_wday, "%d", pt, ptlim, loc);
				continue;
			case 'X':
				pt = _fmt(tptr->X_fmt, t, pt, ptlim, warnp, tptr, loc);
				continue;
			case 'x':
				{
				int	warn2 = IN_SOME;

				pt = _fmt(tptr->x_fmt, t, pt, ptlim, &warn2, tptr, loc);
				if (warn2 == IN_ALL)
					warn2 = IN_THIS;
				if (warn2 > *warnp)
					*warnp = warn2;
				}
				continue;
			case 'y':
				*warnp = IN_ALL;
				pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1,
					pt, ptlim, loc);
				continue;
			case 'Y':
				pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1,
					pt, ptlim, loc);
				continue;
			case 'Z':
#ifdef TM_ZONE
				if (t->TM_ZONE != NULL)
					pt = _add(t->TM_ZONE, pt, ptlim);
				else
#endif /* defined TM_ZONE */
				if (t->tm_isdst >= 0)
					pt = _add(tzname[t->tm_isdst != 0],
						pt, ptlim);
				/*
				** C99 says that %Z must be replaced by the
				** empty string if the time zone is not
				** determinable.
				*/
				continue;
			case 'z':
				{
				int		diff;
				char const *	sign;

				if (t->tm_isdst < 0)
					continue;
#if defined(TM_GMTOFF) && !__DARWIN_UNIX03
				diff = t->TM_GMTOFF;
#else /* !defined TM_GMTOFF || __DARWIN_UNIX03 */
				/*
				** C99 says that the UTC offset must
				** be computed by looking only at
				** tm_isdst. This requirement is
				** incorrect, since it means the code
				** must rely on magic (in this case
				** altzone and timezone), and the
				** magic might not have the correct
				** offset. Doing things correctly is
				** tricky and requires disobeying C99;
				** see GNU C strftime for details.
				** For now, punt and conform to the
				** standard, even though it's incorrect.
				**
				** C99 says that %z must be replaced by the
				** empty string if the time zone is not
				** determinable, so output nothing if the
				** appropriate variables are not available.
				*/
				if (t->tm_isdst == 0)
#ifdef USG_COMPAT
					diff = -_st_get_timezone();
#else /* !defined USG_COMPAT */
					continue;
#endif /* !defined USG_COMPAT */
				else
#ifdef ALTZONE
					diff = -altzone;
#else /* !defined ALTZONE */
					continue;
#endif /* !defined ALTZONE */
#endif /* !defined TM_GMTOFF || __DARWIN_UNIX03 */
				if (diff < 0) {
					sign = "-";
					diff = -diff;
				} else	sign = "+";
				pt = _add(sign, pt, ptlim);
				diff /= SECSPERMIN;
				diff = (diff / MINSPERHOUR) * 100 +
					(diff % MINSPERHOUR);
				pt = _conv(diff,
					fmt_padding[PAD_FMT_YEAR][PadIndex], pt, ptlim, loc);
				}
				continue;
			case '+':
				pt = _fmt(tptr->date_fmt, t, pt, ptlim,
					warnp, tptr, loc);
				continue;
			case '-':
				if (PadIndex != PAD_DEFAULT)
					break;
				PadIndex = PAD_LESS;
				goto label;
			case '_':
				if (PadIndex != PAD_DEFAULT)
					break;
				PadIndex = PAD_SPACE;
				goto label;
			case '0':
				if (PadIndex != PAD_DEFAULT)
					break;
				PadIndex = PAD_ZERO;
				goto label;
			case '%':
			/*
			** X311J/88-090 (4.12.3.5): if conversion char is
			** undefined, behavior is undefined. Print out the
			** character itself as printf(3) also does.
			*/
			default:
				break;
			}
		}
		if (pt == ptlim)
			break;
		*pt++ = *format;
	}
	return pt;
}

static char *
_conv(n, format, pt, ptlim, loc)
const int		n;
const char * const	format;
char * const		pt;
const char * const	ptlim;
locale_t		loc;
{
	char	buf[INT_STRLEN_MAXIMUM(int) + 1];

	(void) sprintf_l(buf, loc, format, n);
	return _add(buf, pt, ptlim);
}

static char *
_add(str, pt, ptlim)
const char *		str;
char *			pt;
const char * const	ptlim;
{
	while (pt < ptlim && (*pt = *str++) != '\0')
		++pt;
	return pt;
}

/*
** POSIX and the C Standard are unclear or inconsistent about
** what %C and %y do if the year is negative or exceeds 9999.
** Use the convention that %C concatenated with %y yields the
** same output as %Y, and that %Y contains at least 4 bytes,
** with more only if necessary.
*/

static char *
_yconv(a, b, convert_top, convert_yy, pt, ptlim, loc)
const int		a;
const int		b;
const int		convert_top;
const int		convert_yy;
char *			pt;
const char * const	ptlim;
locale_t		loc;
{
	register int	lead;
	register int	trail;

#define DIVISOR	100
	trail = a % DIVISOR + b % DIVISOR;
	lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR;
	trail %= DIVISOR;
	if (trail < 0 && lead > 0) {
		trail += DIVISOR;
		--lead;
	} else if (lead < 0 && trail > 0) {
		trail -= DIVISOR;
		++lead;
	}
	if (convert_top) {
		if (lead == 0 && trail < 0)
			pt = _add("-0", pt, ptlim);
		else	pt = _conv(lead, "%02d", pt, ptlim, loc);
	}
	if (convert_yy)
		pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim, loc);
	return pt;
}
#endif /* !BUILDING_VARIANT */
Commit	Line	Data
5b2abdfb A	1	/*
	2	* Copyright (c) 1989 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms are permitted
	6	* provided that the above copyright notice and this paragraph are
	7	* duplicated in all such forms and that any documentation,
	8	* advertising materials, and other materials related to such
	9	* distribution and use acknowledge that the software was developed
1f2f436a	10	* by the University of California, Berkeley. The name of the
5b2abdfb A	11	* University may not be used to endorse or promote products derived
	12	* from this software without specific prior written permission.
	13	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	15	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
	16	*/
	17
b061a43b	18	#if 0
1f2f436a	19	static const char elsieid[] = "@(#)strftime.3 8.3";
5b2abdfb A	20	/*
	21	** Based on the UCB version with the ID appearing below.
	22	** This is ANSIish only when "multibyte character == plain character".
	23	*/
b061a43b	24	#endif
5b2abdfb	25
ad3c9f2a A	26	#include "xlocale_private.h"
ad3c9f2a A	27
9385eb3d	28	#include "namespace.h"
5b2abdfb A	29	#include "private.h"
5b2abdfb A	30
9385eb3d	31	#if defined(LIBC_SCCS) && !defined(lint)
5b2abdfb	32	static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89";
9385eb3d A	33	#endif /* LIBC_SCCS and not lint */
9385eb3d A	34	#include <sys/cdefs.h>
1f2f436a	35	__FBSDID("$FreeBSD: src/lib/libc/stdtime/strftime.c,v 1.44 2009/06/09 09:02:58 delphij Exp $");
5b2abdfb A	36
5b2abdfb A	37	#include "tzfile.h"
ad3c9f2a	38	#include <time.h>
5b2abdfb A	39	#include <fcntl.h>
5b2abdfb A	40	#include <sys/stat.h>
9385eb3d	41	#include "un-namespace.h"
5b2abdfb A	42	#include "timelocal.h"
5b2abdfb A	43
ad3c9f2a	44	#if !BUILDING_VARIANT
9385eb3d	45	static char * _add(const char , char , const char *);
ad3c9f2a A	46	static char * _conv(int, const char , char , const char *, locale_t);
	47	static char * _yconv(int, int, int, int, char , const char , locale_t);
	48	#endif
	49	#define _fmt _st_fmt
	50	__private_extern__ char * _fmt(const char , const struct tm , char , const char ,
	51	int , struct lc_time_T , locale_t);
5b2abdfb A	52
5b2abdfb A	53	extern char * tzname[];
b061a43b	54	extern long __darwin_altzone; /* DST timezone offset */
ad3c9f2a A	55	#define altzone __darwin_altzone
ad3c9f2a A	56	__private_extern__ long _st_get_timezone(void);
5b2abdfb	57
3d9156a7 A	58	#ifndef YEAR_2000_NAME
	59	#define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS"
	60	#endif /* !defined YEAR_2000_NAME */
	61
3d9156a7 A	62	#define IN_NONE 0
	63	#define IN_SOME 1
	64	#define IN_THIS 2
	65	#define IN_ALL 3
	66
1f2f436a A	67	#define PAD_DEFAULT 0
	68	#define PAD_LESS 1
	69	#define PAD_SPACE 2
	70	#define PAD_ZERO 3
	71
ad3c9f2a	72	#ifndef BUILDING_VARIANT
6465356a	73	static const char * const fmt_padding[][4] = {
1f2f436a A	74	/* DEFAULT, LESS, SPACE, ZERO */
	75	#define PAD_FMT_MONTHDAY 0
	76	#define PAD_FMT_HMS 0
	77	#define PAD_FMT_CENTURY 0
	78	#define PAD_FMT_SHORTYEAR 0
	79	#define PAD_FMT_MONTH 0
	80	#define PAD_FMT_WEEKOFYEAR 0
	81	#define PAD_FMT_DAYOFMONTH 0
	82	{ "%02d", "%d", "%2d", "%02d" },
	83	#define PAD_FMT_SDAYOFMONTH 1
	84	#define PAD_FMT_SHMS 1
	85	{ "%2d", "%d", "%2d", "%02d" },
	86	#define PAD_FMT_DAYOFYEAR 2
	87	{ "%03d", "%d", "%3d", "%03d" },
	88	#define PAD_FMT_YEAR 3
	89	{ "%04d", "%d", "%4d", "%04d" }
	90	};
ad3c9f2a A	91	#endif
	92
	93	#define USG_COMPAT
	94	#define ALTZONE
1f2f436a	95
5b2abdfb	96	size_t
ad3c9f2a A	97	strftime_l(char * __restrict s, size_t maxsize, const char * __restrict format,
ad3c9f2a A	98	const struct tm * __restrict t, locale_t loc)
5b2abdfb	99	{
3d9156a7 A	100	char * p;
3d9156a7 A	101	int warn;
5b2abdfb	102
ad3c9f2a	103	NORMALIZE_LOCALE(loc);
5b2abdfb	104	tzset();
3d9156a7	105	warn = IN_NONE;
ad3c9f2a	106	p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn, __get_current_time_locale(loc), loc);
3d9156a7 A	107	#ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
3d9156a7 A	108	if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) {
ad3c9f2a	109	(void) fputs("\n", stderr);
3d9156a7	110	if (format == NULL)
ad3c9f2a A	111	(void) fputs("NULL strftime format ", stderr);
ad3c9f2a A	112	else (void) fprintf_l(stderr, loc, "strftime format \"%s\" ",
3d9156a7	113	format);
ad3c9f2a	114	(void) fputs("yields only two digits of years in ", stderr);
3d9156a7	115	if (warn == IN_SOME)
ad3c9f2a	116	(void) fputs("some locales", stderr);
3d9156a7	117	else if (warn == IN_THIS)
ad3c9f2a A	118	(void) fputs("the current locale", stderr);
	119	else (void) fputs("all locales", stderr);
	120	(void) fputs("\n", stderr);
3d9156a7 A	121	}
3d9156a7 A	122	#endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */
5b2abdfb A	123	if (p == s + maxsize)
	124	return 0;
	125	*p = '\0';
	126	return p - s;
	127	}
	128
ad3c9f2a A	129	size_t
	130	strftime(char * __restrict s, size_t maxsize, const char * __restrict format,
	131	const struct tm * __restrict t)
	132	{
	133	return strftime_l(s, maxsize, format, t, __current_locale());
	134	}
	135
	136	#ifndef BUILDING_VARIANT
	137	__private_extern__ char *
	138	_fmt(format, t, pt, ptlim, warnp, tptr, loc)
3d9156a7 A	139	const char * format;
	140	const struct tm * const t;
	141	char * pt;
	142	const char * const ptlim;
	143	int * warnp;
ad3c9f2a A	144	struct lc_time_T * tptr;
ad3c9f2a A	145	locale_t loc;
5b2abdfb	146	{
1f2f436a	147	int Ealternative, Oalternative, PadIndex;
5b2abdfb A	148
	149	for ( ; *format; ++format) {
	150	if (*format == '%') {
	151	Ealternative = 0;
	152	Oalternative = 0;
1f2f436a	153	PadIndex = PAD_DEFAULT;
5b2abdfb A	154	label:
	155	switch (*++format) {
	156	case '\0':
	157	--format;
	158	break;
	159	case 'A':
3d9156a7 A	160	pt = _add((t->tm_wday < 0 \|\|
3d9156a7 A	161	t->tm_wday >= DAYSPERWEEK) ?
9385eb3d	162	"?" : tptr->weekday[t->tm_wday],
5b2abdfb A	163	pt, ptlim);
	164	continue;
	165	case 'a':
3d9156a7 A	166	pt = _add((t->tm_wday < 0 \|\|
3d9156a7 A	167	t->tm_wday >= DAYSPERWEEK) ?
9385eb3d	168	"?" : tptr->wday[t->tm_wday],
5b2abdfb A	169	pt, ptlim);
	170	continue;
	171	case 'B':
3d9156a7 A	172	pt = _add((t->tm_mon < 0 \|\|
3d9156a7 A	173	t->tm_mon >= MONSPERYEAR) ?
9385eb3d A	174	"?" : (Oalternative ? tptr->alt_month :
9385eb3d A	175	tptr->month)[t->tm_mon],
5b2abdfb A	176	pt, ptlim);
	177	continue;
	178	case 'b':
	179	case 'h':
3d9156a7 A	180	pt = _add((t->tm_mon < 0 \|\|
3d9156a7 A	181	t->tm_mon >= MONSPERYEAR) ?
9385eb3d	182	"?" : tptr->mon[t->tm_mon],
5b2abdfb A	183	pt, ptlim);
	184	continue;
	185	case 'C':
	186	/*
	187	** %C used to do a...
ad3c9f2a	188	** _fmt("%a %b %e %X %Y", t, tptr, loc);
5b2abdfb A	189	** ...whereas now POSIX 1003.2 calls for
5b2abdfb A	190	** something completely different.
3d9156a7	191	** (ado, 1993-05-24)
5b2abdfb	192	*/
1f2f436a	193	pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0,
ad3c9f2a	194	pt, ptlim, loc);
5b2abdfb A	195	continue;
5b2abdfb A	196	case 'c':
3d9156a7 A	197	{
	198	int warn2 = IN_SOME;
	199
ad3c9f2a	200	pt = _fmt(tptr->c_fmt, t, pt, ptlim, &warn2, tptr, loc);
3d9156a7 A	201	if (warn2 == IN_ALL)
	202	warn2 = IN_THIS;
	203	if (warn2 > *warnp)
	204	*warnp = warn2;
	205	}
5b2abdfb A	206	continue;
5b2abdfb A	207	case 'D':
ad3c9f2a	208	pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp, tptr, loc);
5b2abdfb A	209	continue;
5b2abdfb A	210	case 'd':
1f2f436a	211	pt = _conv(t->tm_mday, fmt_padding[PAD_FMT_DAYOFMONTH][PadIndex],
ad3c9f2a	212	pt, ptlim, loc);
5b2abdfb A	213	continue;
	214	case 'E':
	215	if (Ealternative \|\| Oalternative)
	216	break;
	217	Ealternative++;
	218	goto label;
	219	case 'O':
	220	/*
3d9156a7	221	** C99 locale modifiers.
5b2abdfb	222	** The sequences
3d9156a7	223	** %Ec %EC %Ex %EX %Ey %EY
5b2abdfb A	224	** %Od %oe %OH %OI %Om %OM
	225	** %OS %Ou %OU %OV %Ow %OW %Oy
	226	** are supposed to provide alternate
	227	** representations.
5b2abdfb	228	**
3d9156a7 A	229	** FreeBSD extension
3d9156a7 A	230	** %OB
5b2abdfb A	231	*/
	232	if (Ealternative \|\| Oalternative)
	233	break;
	234	Oalternative++;
	235	goto label;
	236	case 'e':
1f2f436a	237	pt = _conv(t->tm_mday,
ad3c9f2a	238	fmt_padding[PAD_FMT_SDAYOFMONTH][PadIndex], pt, ptlim, loc);
5b2abdfb	239	continue;
5b2abdfb	240	case 'F':
ad3c9f2a	241	pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp, tptr, loc);
5b2abdfb A	242	continue;
5b2abdfb A	243	case 'H':
1f2f436a	244	pt = _conv(t->tm_hour, fmt_padding[PAD_FMT_HMS][PadIndex],
ad3c9f2a	245	pt, ptlim, loc);
5b2abdfb A	246	continue;
	247	case 'I':
	248	pt = _conv((t->tm_hour % 12) ?
	249	(t->tm_hour % 12) : 12,
ad3c9f2a	250	fmt_padding[PAD_FMT_HMS][PadIndex], pt, ptlim, loc);
5b2abdfb A	251	continue;
5b2abdfb A	252	case 'j':
1f2f436a	253	pt = _conv(t->tm_yday + 1,
ad3c9f2a	254	fmt_padding[PAD_FMT_DAYOFYEAR][PadIndex], pt, ptlim, loc);
5b2abdfb A	255	continue;
	256	case 'k':
	257	/*
	258	** This used to be...
	259	** _conv(t->tm_hour % 12 ?
ad3c9f2a	260	** t->tm_hour % 12 : 12, 2, ' ', loc);
5b2abdfb A	261	** ...and has been changed to the below to
5b2abdfb A	262	** match SunOS 4.1.1 and Arnold Robbins'
1f2f436a	263	** strftime version 3.0. That is, "%k" and
5b2abdfb	264	** "%l" have been swapped.
3d9156a7	265	** (ado, 1993-05-24)
5b2abdfb	266	*/
1f2f436a	267	pt = _conv(t->tm_hour, fmt_padding[PAD_FMT_SHMS][PadIndex],
ad3c9f2a	268	pt, ptlim, loc);
5b2abdfb A	269	continue;
	270	#ifdef KITCHEN_SINK
	271	case 'K':
	272	/*
	273	** After all this time, still unclaimed!
	274	*/
	275	pt = _add("kitchen sink", pt, ptlim);
	276	continue;
	277	#endif /* defined KITCHEN_SINK */
	278	case 'l':
	279	/*
	280	** This used to be...
	281	** _conv(t->tm_hour, 2, ' ');
	282	** ...and has been changed to the below to
	283	** match SunOS 4.1.1 and Arnold Robbin's
1f2f436a	284	** strftime version 3.0. That is, "%k" and
5b2abdfb	285	** "%l" have been swapped.
3d9156a7	286	** (ado, 1993-05-24)
5b2abdfb A	287	*/
	288	pt = _conv((t->tm_hour % 12) ?
	289	(t->tm_hour % 12) : 12,
ad3c9f2a	290	fmt_padding[PAD_FMT_SHMS][PadIndex], pt, ptlim, loc);
5b2abdfb A	291	continue;
5b2abdfb A	292	case 'M':
1f2f436a	293	pt = _conv(t->tm_min, fmt_padding[PAD_FMT_HMS][PadIndex],
ad3c9f2a	294	pt, ptlim, loc);
5b2abdfb A	295	continue;
5b2abdfb A	296	case 'm':
1f2f436a	297	pt = _conv(t->tm_mon + 1,
ad3c9f2a	298	fmt_padding[PAD_FMT_MONTH][PadIndex], pt, ptlim, loc);
5b2abdfb A	299	continue;
	300	case 'n':
	301	pt = _add("\n", pt, ptlim);
	302	continue;
	303	case 'p':
3d9156a7	304	pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ?
9385eb3d A	305	tptr->pm :
9385eb3d A	306	tptr->am,
5b2abdfb A	307	pt, ptlim);
	308	continue;
	309	case 'R':
ad3c9f2a	310	pt = _fmt("%H:%M", t, pt, ptlim, warnp, tptr, loc);
5b2abdfb A	311	continue;
5b2abdfb A	312	case 'r':
3d9156a7	313	pt = _fmt(tptr->ampm_fmt, t, pt, ptlim,
ad3c9f2a	314	warnp, tptr, loc);
5b2abdfb A	315	continue;
5b2abdfb A	316	case 'S':
1f2f436a	317	pt = _conv(t->tm_sec, fmt_padding[PAD_FMT_HMS][PadIndex],
ad3c9f2a	318	pt, ptlim, loc);
5b2abdfb A	319	continue;
	320	case 's':
	321	{
	322	struct tm tm;
	323	char buf[INT_STRLEN_MAXIMUM(
	324	time_t) + 1];
	325	time_t mkt;
	326
	327	tm = *t;
	328	mkt = mktime(&tm);
	329	if (TYPE_SIGNED(time_t))
ad3c9f2a	330	(void) sprintf_l(buf, loc, "%ld",
5b2abdfb	331	(long) mkt);
ad3c9f2a	332	else (void) sprintf_l(buf, loc, "%lu",
5b2abdfb A	333	(unsigned long) mkt);
	334	pt = _add(buf, pt, ptlim);
	335	}
	336	continue;
	337	case 'T':
ad3c9f2a	338	pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp, tptr, loc);
5b2abdfb A	339	continue;
	340	case 't':
	341	pt = _add("\t", pt, ptlim);
	342	continue;
	343	case 'U':
3d9156a7 A	344	pt = _conv((t->tm_yday + DAYSPERWEEK -
3d9156a7 A	345	t->tm_wday) / DAYSPERWEEK,
ad3c9f2a	346	fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex], pt, ptlim, loc);
5b2abdfb A	347	continue;
	348	case 'u':
	349	/*
	350	** From Arnold Robbins' strftime version 3.0:
	351	** "ISO 8601: Weekday as a decimal number
	352	** [1 (Monday) - 7]"
3d9156a7	353	** (ado, 1993-05-24)
5b2abdfb	354	*/
3d9156a7 A	355	pt = _conv((t->tm_wday == 0) ?
3d9156a7 A	356	DAYSPERWEEK : t->tm_wday,
ad3c9f2a	357	"%d", pt, ptlim, loc);
5b2abdfb A	358	continue;
	359	case 'V': /* ISO 8601 week number */
	360	case 'G': /* ISO 8601 year (four digits) */
	361	case 'g': /* ISO 8601 year (two digits) */
	362	/*
1f2f436a	363	** From Arnold Robbins' strftime version 3.0: "the week number of the
5b2abdfb A	364	** year (the first Monday as the first day of week 1) as a decimal number
	365	** (01-53)."
	366	** (ado, 1993-05-24)
	367	**
	368	** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn:
	369	** "Week 01 of a year is per definition the first week which has the
	370	** Thursday in this year, which is equivalent to the week which contains
	371	** the fourth day of January. In other words, the first week of a new year
	372	** is the week which has the majority of its days in the new year. Week 01
	373	** might also contain days from the previous year and the week before week
	374	** 01 of a year is the last week (52 or 53) of the previous year even if
	375	** it contains days from the new year. A week starts with Monday (day 1)
1f2f436a	376	** and ends with Sunday (day 7). For example, the first week of the year
5b2abdfb A	377	** 1997 lasts from 1996-12-30 to 1997-01-05..."
	378	** (ado, 1996-01-02)
	379	*/
	380	{
	381	int year;
1f2f436a	382	int base;
5b2abdfb A	383	int yday;
	384	int wday;
	385	int w;
	386
1f2f436a A	387	year = t->tm_year;
1f2f436a A	388	base = TM_YEAR_BASE;
5b2abdfb A	389	yday = t->tm_yday;
	390	wday = t->tm_wday;
	391	for ( ; ; ) {
	392	int len;
	393	int bot;
	394	int top;
	395
1f2f436a	396	len = isleap_sum(year, base) ?
5b2abdfb A	397	DAYSPERLYEAR :
	398	DAYSPERNYEAR;
	399	/*
	400	** What yday (-3 ... 3) does
	401	** the ISO year begin on?
	402	*/
	403	bot = ((yday + 11 - wday) %
	404	DAYSPERWEEK) - 3;
	405	/*
	406	** What yday does the NEXT
	407	** ISO year begin on?
	408	*/
	409	top = bot -
	410	(len % DAYSPERWEEK);
	411	if (top < -3)
	412	top += DAYSPERWEEK;
	413	top += len;
	414	if (yday >= top) {
1f2f436a	415	++base;
5b2abdfb A	416	w = 1;
	417	break;
	418	}
	419	if (yday >= bot) {
	420	w = 1 + ((yday - bot) /
	421	DAYSPERWEEK);
	422	break;
	423	}
1f2f436a A	424	--base;
1f2f436a A	425	yday += isleap_sum(year, base) ?
5b2abdfb A	426	DAYSPERLYEAR :
	427	DAYSPERNYEAR;
	428	}
	429	#ifdef XPG4_1994_04_09
1f2f436a A	430	if ((w == 52 &&
	431	t->tm_mon == TM_JANUARY) \|\|
	432	(w == 1 &&
	433	t->tm_mon == TM_DECEMBER))
	434	w = 53;
5b2abdfb A	435	#endif /* defined XPG4_1994_04_09 */
5b2abdfb A	436	if (*format == 'V')
1f2f436a	437	pt = _conv(w, fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex],
ad3c9f2a	438	pt, ptlim, loc);
5b2abdfb	439	else if (*format == 'g') {
3d9156a7	440	*warnp = IN_ALL;
1f2f436a	441	pt = _yconv(year, base, 0, 1,
ad3c9f2a	442	pt, ptlim, loc);
1f2f436a	443	} else pt = _yconv(year, base, 1, 1,
ad3c9f2a	444	pt, ptlim, loc);
5b2abdfb A	445	}
	446	continue;
	447	case 'v':
	448	/*
	449	** From Arnold Robbins' strftime version 3.0:
	450	** "date as dd-bbb-YYYY"
3d9156a7	451	** (ado, 1993-05-24)
5b2abdfb	452	*/
ad3c9f2a	453	pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp, tptr, loc);
5b2abdfb A	454	continue;
5b2abdfb A	455	case 'W':
3d9156a7	456	pt = _conv((t->tm_yday + DAYSPERWEEK -
5b2abdfb	457	(t->tm_wday ?
3d9156a7 A	458	(t->tm_wday - 1) :
3d9156a7 A	459	(DAYSPERWEEK - 1))) / DAYSPERWEEK,
ad3c9f2a	460	fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex], pt, ptlim, loc);
5b2abdfb A	461	continue;
5b2abdfb A	462	case 'w':
ad3c9f2a	463	pt = _conv(t->tm_wday, "%d", pt, ptlim, loc);
5b2abdfb A	464	continue;
5b2abdfb A	465	case 'X':
ad3c9f2a	466	pt = _fmt(tptr->X_fmt, t, pt, ptlim, warnp, tptr, loc);
5b2abdfb A	467	continue;
5b2abdfb A	468	case 'x':
3d9156a7 A	469	{
	470	int warn2 = IN_SOME;
	471
ad3c9f2a	472	pt = _fmt(tptr->x_fmt, t, pt, ptlim, &warn2, tptr, loc);
3d9156a7 A	473	if (warn2 == IN_ALL)
	474	warn2 = IN_THIS;
	475	if (warn2 > *warnp)
	476	*warnp = warn2;
	477	}
5b2abdfb A	478	continue;
5b2abdfb A	479	case 'y':
3d9156a7	480	*warnp = IN_ALL;
1f2f436a	481	pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1,
ad3c9f2a	482	pt, ptlim, loc);
5b2abdfb A	483	continue;
5b2abdfb A	484	case 'Y':
1f2f436a	485	pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1,
ad3c9f2a	486	pt, ptlim, loc);
5b2abdfb A	487	continue;
5b2abdfb A	488	case 'Z':
3d9156a7 A	489	#ifdef TM_ZONE
	490	if (t->TM_ZONE != NULL)
	491	pt = _add(t->TM_ZONE, pt, ptlim);
5b2abdfb	492	else
3d9156a7 A	493	#endif /* defined TM_ZONE */
	494	if (t->tm_isdst >= 0)
	495	pt = _add(tzname[t->tm_isdst != 0],
5b2abdfb	496	pt, ptlim);
3d9156a7 A	497	/*
	498	** C99 says that %Z must be replaced by the
	499	** empty string if the time zone is not
	500	** determinable.
	501	*/
5b2abdfb A	502	continue;
	503	case 'z':
	504	{
3d9156a7 A	505	int diff;
	506	char const * sign;
	507
	508	if (t->tm_isdst < 0)
	509	continue;
ad3c9f2a	510	#if defined(TM_GMTOFF) && !__DARWIN_UNIX03
3d9156a7	511	diff = t->TM_GMTOFF;
ad3c9f2a	512	#else /* !defined TM_GMTOFF \|\| __DARWIN_UNIX03 */
3d9156a7 A	513	/*
	514	** C99 says that the UTC offset must
	515	** be computed by looking only at
1f2f436a	516	** tm_isdst. This requirement is
3d9156a7 A	517	** incorrect, since it means the code
	518	** must rely on magic (in this case
	519	** altzone and timezone), and the
	520	** magic might not have the correct
1f2f436a	521	** offset. Doing things correctly is
3d9156a7 A	522	** tricky and requires disobeying C99;
	523	** see GNU C strftime for details.
	524	** For now, punt and conform to the
	525	** standard, even though it's incorrect.
	526	**
	527	** C99 says that %z must be replaced by the
	528	** empty string if the time zone is not
	529	** determinable, so output nothing if the
	530	** appropriate variables are not available.
	531	*/
	532	if (t->tm_isdst == 0)
	533	#ifdef USG_COMPAT
ad3c9f2a	534	diff = -_st_get_timezone();
3d9156a7 A	535	#else /* !defined USG_COMPAT */
	536	continue;
	537	#endif /* !defined USG_COMPAT */
	538	else
	539	#ifdef ALTZONE
	540	diff = -altzone;
	541	#else /* !defined ALTZONE */
	542	continue;
	543	#endif /* !defined ALTZONE */
ad3c9f2a	544	#endif /* !defined TM_GMTOFF \|\| __DARWIN_UNIX03 */
3d9156a7 A	545	if (diff < 0) {
	546	sign = "-";
	547	diff = -diff;
	548	} else sign = "+";
	549	pt = _add(sign, pt, ptlim);
1f2f436a A	550	diff /= SECSPERMIN;
	551	diff = (diff / MINSPERHOUR) * 100 +
	552	(diff % MINSPERHOUR);
	553	pt = _conv(diff,
ad3c9f2a	554	fmt_padding[PAD_FMT_YEAR][PadIndex], pt, ptlim, loc);
3d9156a7	555	}
5b2abdfb A	556	continue;
5b2abdfb A	557	case '+':
3d9156a7	558	pt = _fmt(tptr->date_fmt, t, pt, ptlim,
ad3c9f2a	559	warnp, tptr, loc);
5b2abdfb	560	continue;
1f2f436a A	561	case '-':
	562	if (PadIndex != PAD_DEFAULT)
	563	break;
	564	PadIndex = PAD_LESS;
	565	goto label;
	566	case '_':
	567	if (PadIndex != PAD_DEFAULT)
	568	break;
	569	PadIndex = PAD_SPACE;
	570	goto label;
	571	case '0':
	572	if (PadIndex != PAD_DEFAULT)
	573	break;
	574	PadIndex = PAD_ZERO;
	575	goto label;
5b2abdfb A	576	case '%':
5b2abdfb A	577	/*
3d9156a7	578	** X311J/88-090 (4.12.3.5): if conversion char is
1f2f436a	579	** undefined, behavior is undefined. Print out the
3d9156a7 A	580	** character itself as printf(3) also does.
3d9156a7 A	581	*/
5b2abdfb A	582	default:
	583	break;
	584	}
	585	}
	586	if (pt == ptlim)
	587	break;
	588	pt++ = format;
	589	}
	590	return pt;
	591	}
	592
	593	static char *
ad3c9f2a	594	_conv(n, format, pt, ptlim, loc)
3d9156a7 A	595	const int n;
	596	const char * const format;
	597	char * const pt;
	598	const char * const ptlim;
ad3c9f2a	599	locale_t loc;
5b2abdfb A	600	{
	601	char buf[INT_STRLEN_MAXIMUM(int) + 1];
	602
ad3c9f2a	603	(void) sprintf_l(buf, loc, format, n);
5b2abdfb A	604	return _add(buf, pt, ptlim);
	605	}
	606
	607	static char *
	608	_add(str, pt, ptlim)
3d9156a7 A	609	const char * str;
	610	char * pt;
	611	const char * const ptlim;
5b2abdfb A	612	{
	613	while (pt < ptlim && (pt = str++) != '\0')
	614	++pt;
	615	return pt;
	616	}
1f2f436a A	617
	618	/*
	619	** POSIX and the C Standard are unclear or inconsistent about
	620	** what %C and %y do if the year is negative or exceeds 9999.
	621	** Use the convention that %C concatenated with %y yields the
	622	** same output as %Y, and that %Y contains at least 4 bytes,
	623	** with more only if necessary.
	624	*/
	625
	626	static char *
ad3c9f2a	627	_yconv(a, b, convert_top, convert_yy, pt, ptlim, loc)
1f2f436a A	628	const int a;
	629	const int b;
	630	const int convert_top;
	631	const int convert_yy;
	632	char * pt;
	633	const char * const ptlim;
ad3c9f2a	634	locale_t loc;
1f2f436a A	635	{
	636	register int lead;
	637	register int trail;
	638
	639	#define DIVISOR 100
	640	trail = a % DIVISOR + b % DIVISOR;
	641	lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR;
	642	trail %= DIVISOR;
	643	if (trail < 0 && lead > 0) {
	644	trail += DIVISOR;
	645	--lead;
	646	} else if (lead < 0 && trail > 0) {
	647	trail -= DIVISOR;
	648	++lead;
	649	}
	650	if (convert_top) {
	651	if (lead == 0 && trail < 0)
	652	pt = _add("-0", pt, ptlim);
ad3c9f2a	653	else pt = _conv(lead, "%02d", pt, ptlim, loc);
1f2f436a A	654	}
1f2f436a A	655	if (convert_yy)
ad3c9f2a	656	pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim, loc);
1f2f436a A	657	return pt;
1f2f436a A	658	}
ad3c9f2a	659	#endif /* !BUILDING_VARIANT */