uclibc-ng/libc/misc/time/time.c

/*  Copyright (C) 2002     Manuel Novoa III
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/*  ATTENTION!   ATTENTION!   ATTENTION!   ATTENTION!   ATTENTION!
 *
 *  Besides uClibc, I'm using this code in my libc for elks, which is
 *  a 16-bit environment with a fairly limited compiler.  It would make
 *  things much easier for me if this file isn't modified unnecessarily.
 *  In particular, please put any new or replacement functions somewhere
 *  else, and modify the makefile to use your version instead.
 *  Thanks.  Manuel
 *
 *  ATTENTION!   ATTENTION!   ATTENTION!   ATTENTION!   ATTENTION! */

/* June 15, 2002     Initial Notes:
 *
 * Note: It is assumed throught that time_t is either long or unsigned long.
 *       Similarly, clock_t is assumed to be long int.
 *
 * Warning: Assumptions are made about the layout of struct tm!  It is
 *    assumed that the initial fields of struct tm are (in order):
 *    tm_sec, tm_min, tm_hour, tm_mday, tm_mon, tm_year, tm_wday, tm_yday
 *
 * Reached the inital goal of supporting the ANSI/ISO C99 time functions
 * as well as SUSv3's strptime.  All timezone info is obtained from the
 * TZ env variable.
 *
 * Differences from glibc worth noting:
 *
 * Leap seconds are not considered here.
 *
 * glibc stores additional timezone info the struct tm, whereas we don't.
 *
 * Alternate digits and era handling are not currently implemented.
 * The modifiers are accepted, and tested for validity with the following
 * specifier, but are ignored otherwise.
 *
 * strftime does not implement glibc extension modifiers or widths for
 *     conversion specifiers.  However it does implement the glibc
 *     extension specifiers %l, %k, and %s.  It also recognizes %P, but
 *     treats it as a synonym for %p; i.e. doesn't convert to lower case.
 *
 * strptime implements the glibc extension specifiers.  However, it follows
 *     SUSv3 in requiring at least one non-alphanumeric char between
 *     conversion specifiers.  Also, strptime only sets struct tm fields
 *     for which format specifiers appear and does not try to infer other
 *     fields (such as wday) as glibc's version does.
 *
 * TODO - Since glibc's %l and %k can space-pad their output in strftime,
 *     it might be reasonable to eat whitespace first for those specifiers.
 *     This could be done by pushing " %I" and " %H" respectively so that
 *     leading whitespace is consumed.  This is really only an issue if %l
 *     or %k occurs at the start of the format string.
 *
 * TODO - Implement getdate? tzfile? struct tm extensions?
 *
 * TODO - Rework _time_mktime to remove the dependency on long long.
 *
 * TODO - Make tzset and _time_tzinfo refs threadsafe.
 */

#define _GNU_SOURCE
#define _STDIO_UTILITY
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <time.h>
#include <limits.h>
#include <assert.h>
#include <errno.h>
#include <ctype.h>
#include <langinfo.h>
#include <locale.h>

#ifndef __isleap
#define __isleap(y) ( !((y) % 4) && ( ((y) % 100) || !((y) % 400) ) )
#endif

#ifndef TZNAME_MAX
#define TZNAME_MAX _POSIX_TZNAME_MAX
#endif

/* TODO - This stuff belongs in some include/bits/ file. */
#ifndef __BCC__
#undef CLK_TCK
#if (TARGET_ARCH == alpha) || (TARGET_ARCH == ia64)
#define CLK_TCK     1024
#else
#define CLK_TCK     100
#endif
#endif

/* The era code is currently unfinished. */
/*  #define ENABLE_ERA_CODE */

extern struct tm __time_tm;

typedef struct {
	long gmt_offset;
	long dst_offset;
	short day;					/* for J or normal */
	short week;
	short month;
	short rule_type;			/* J, M, \0 */
	char tzname[TZNAME_MAX+1];
} rule_struct;

extern rule_struct _time_tzinfo[2];

extern struct tm *_time_t2tm(const time_t *__restrict timer,
							 int offset, struct tm *__restrict result);

extern time_t _time_mktime(struct tm *timeptr, int store_on_success);

/**********************************************************************/
#ifdef L_asctime

static char __time_str[26];

char *asctime(const struct tm *__restrict ptm)
{
	return asctime_r(ptm, __time_str);
}

#endif
/**********************************************************************/
#ifdef L_asctime_r

/* Strictly speaking, this implementation isn't correct.  ANSI/ISO specifies
 * that the implementation of asctime() be equivalent to
 *
 *   char *asctime(const struct tm *timeptr)
 *   {
 *       static char wday_name[7][3] = {
 *           "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
 *       };
 *       static char mon_name[12][3] = {
 *           "Jan", "Feb", "Mar", "Apr", "May", "Jun",
 *           "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 
 *       };
 *       static char result[26];
 *   
 *       sprintf(result, "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n",
 *           wday_name[timeptr->tm_wday],                   
 *           mon_name[timeptr->tm_mon],
 *           timeptr->tm_mday, timeptr->tm_hour,
 *           timeptr->tm_min, timeptr->tm_sec,  
 *           1900 + timeptr->tm_year);        
 *       return result;
 *   }
 *
 * but the above is either inherently unsafe, or carries with it the implicit
 * assumption that all fields of timeptr fall within their usual ranges, and
 * that the tm_year value falls in the range [-2899,8099] to avoid overflowing
 * the static buffer.
 *
 * If we take the implicit assumption as given, then the implementation below
 * is still incorrect for tm_year values < -900, as there will be either
 * 0-padding and/or a missing negative sign for the year conversion .  But given
 * the ususal use of asctime(), I think it isn't unreasonable to restrict correct
 * operation to the domain of years between 1000 and 9999.
 */

/* This is generally a good thing, but if you're _sure_ any data passed will be
 * in range, you can #undef this. */
#define SAFE_ASCTIME_R		1

static const unsigned char at_data[] = {
	'S', 'u', 'n', 'M', 'o', 'n', 'T', 'u', 'e', 'W', 'e', 'd',
	'T', 'h', 'u', 'F', 'r', 'i', 'S', 'a', 't',

	'J', 'a', 'n', 'F', 'e', 'b', 'M', 'a', 'r', 'A', 'p', 'r',
	'M', 'a', 'y', 'J', 'u', 'n', 'J', 'u', 'l', 'A', 'u', 'g',
	'S', 'e', 'p', 'O', 'c', 't', 'N', 'o', 'v', 'D', 'e', 'c', 

#ifdef SAFE_ASCTIME_R
	'?', '?', '?', 
#endif
	' ', '?', '?', '?',
	' ', '0',
	offsetof(struct tm, tm_mday),
	' ', '0',
	offsetof(struct tm, tm_hour),
	':', '0',
	offsetof(struct tm, tm_min),
	':', '0',
	offsetof(struct tm, tm_sec),
	' ', '?', '?', '?', '?', '\n', 0
};

char *asctime_r(register const struct tm *__restrict ptm,
				register char *__restrict buffer)
{
	int tmp;

	assert(ptm);
	assert(buffer);

#ifdef SAFE_ASCTIME_R
	memcpy(buffer, at_data + 3*(7 + 12), sizeof(at_data) - 3*(7 + 12));

	if (((unsigned int)(ptm->tm_wday)) <= 6) {
		memcpy(buffer, at_data + 3 * ptm->tm_wday, 3);
	}

	if (((unsigned int)(ptm->tm_mon)) <= 11) {
		memcpy(buffer + 4, at_data + 3*7 + 3 * ptm->tm_mon, 3);
	}
#else
	assert(((unsigned int)(ptm->tm_wday)) <= 6);
	assert(((unsigned int)(ptm->tm_mon)) <= 11);

	memcpy(buffer, at_data + 3*(7 + 12) - 3, sizeof(at_data) + 3 - 3*(7 + 12));

	memcpy(buffer, at_data + 3 * ptm->tm_wday, 3);
	memcpy(buffer + 4, at_data + 3*7 + 3 * ptm->tm_mon, 3);
#endif

#ifdef SAFE_ASCTIME_R
	buffer += 19;
	tmp = ptm->tm_year + 1900;
	if (((unsigned int) tmp) < 10000) {
		buffer += 4;
		do {
			*buffer = '0' + (tmp % 10);
			tmp /= 10;
		} while (*--buffer == '?');
	}
#else  /* SAFE_ASCTIME_R */
	buffer += 23;
	tmp = ptm->tm_year + 1900;
	assert( ((unsigned int) tmp) < 10000 );
	do {
		*buffer = '0' + (tmp % 10);
		tmp /= 10;
	} while (*--buffer == '?');
#endif /* SAFE_ASCTIME_R */

	do {
		--buffer;
		tmp = *((int *)(((const char *) ptm) + (int) *buffer));
#ifdef SAFE_ASCTIME_R
		if (((unsigned int) tmp) >= 100) { /* Just check 2 digit non-neg. */
			buffer[-1] = *buffer = '?';
		} else
#else  /* SAFE_ASCTIME_R */
		assert(((unsigned int) tmp) < 100); /* Just check 2 digit non-neg. */
#endif /* SAFE_ASCTIME_R */
		{
			*buffer = '0' + (tmp % 10);
#ifdef __BCC__
			buffer[-1] = '0' + (tmp/10);
#else  /* __BCC__ */
			buffer[-1] += (tmp/10);
#endif /* __BCC__ */
		}
	} while ((buffer -= 2)[-2] == '0');

	if (*++buffer == '0') {		/* Space-pad day of month. */
		*buffer = ' ';
	}

	return buffer - 8;
}

#endif
/**********************************************************************/
#ifdef L_clock

#include <sys/times.h>

/* Note: According to glibc...
 *    CAE XSH, Issue 4, Version 2: <time.h>
 *    The value of CLOCKS_PER_SEC is required to be 1 million on all
 *    XSI-conformant systems.
 */

#ifndef __BCC__
#if CLOCKS_PER_SEC != 1000000L
#error unexpected value for CLOCKS_PER_SEC!
#endif
#endif

clock_t clock(void)
{
	struct tms xtms;
	unsigned long t;

	times(&xtms);
	t = ((unsigned long) xtms.tms_utime) + xtms.tms_stime;
#if (CLK_TCK == CLOCKS_PER_SEC)
	return (t <= LONG_MAX) ? t : -1;
#elif (CLK_TCK == 1) || (CLK_TCK == 10) || (CLK_TCK == 100) || (CLK_TCK == 1000)
	return (t <= (LONG_MAX / (CLOCKS_PER_SEC/CLK_TCK)))
		? t * (CLOCKS_PER_SEC/CLK_TCK)
		: -1;
#elif (CLK_TCK == 1024)
	return (t <= ((LONG_MAX / CLOCKS_PER_SEC) * CLK_TCK
				  + ((LONG_MAX % CLOCKS_PER_SEC) * CLK_TCK) / CLOCKS_PER_SEC))
		? ((t >> 10) * CLOCKS_PER_SEC) + (((t & 1023) * CLOCKS_PER_SEC) >> 10)
		: -1;
#else
#error fix for CLK_TCK
#endif
}

#endif
/**********************************************************************/
#ifdef L_ctime

char *ctime(const time_t *clock)
{
	/* ANSI/ISO/SUSv3 say that ctime is equivalent to the following. */
	return asctime(localtime(clock));
}

#endif
/**********************************************************************/
#ifdef L_ctime_r

char *ctime_r(const time_t *clock, char *buf)
{
	struct tm xtms;

	return asctime_r(localtime_r(clock, &xtms), buf);
}

#endif
/**********************************************************************/
#ifdef L_difftime

#include <float.h>

#if FLT_RADIX != 2
#error difftime implementation assumptions violated for you arch!
#endif

double difftime(time_t time1, time_t time0)
{
#if (LONG_MAX >> DBL_MANT_DIG) == 0

	/* time_t fits in the mantissa of a double. */
	return ((double) time1) - time0;

#elif ((LONG_MAX >> DBL_MANT_DIG) >> DBL_MANT_DIG) == 0

	/* time_t can overflow the mantissa of a double. */
	time_t t1, t0, d;

	d = ((time_t) 1) << DBL_MANT_DIG;
	t1 = time1 / d;
	time1 -= (t1 * d);
	t0 = time0 / d;
	time0 -= (t0*d);

	/* Since FLT_RADIX==2 and d is a power of 2, the only possible
	 * rounding error in the expression below would occur from the
	 * addition. */
	return (((double) t1) - t0) * d + (((double) time1) - time0);

#else
#error difftime needs special implementation on your arch.
#endif
}

#endif
/**********************************************************************/
#ifdef L_gmtime

struct tm *gmtime(const time_t *timer)
{
	register struct tm *ptm = &__time_tm;

	_time_t2tm(timer, 0, ptm); /* Can return NULL... */

	return ptm;
}

#endif
/**********************************************************************/
#ifdef L_gmtime_r

struct tm *gmtime_r(const time_t *__restrict timer,
					struct tm *__restrict result)
{
	return _time_t2tm(timer, 0, result);
}

#endif
/**********************************************************************/
#ifdef L_localtime

struct tm *localtime(const time_t *timer)
{
	register struct tm *ptm = &__time_tm;

	tzset();

	localtime_r(timer, ptm);	/* Can return NULL... */

	return ptm;
}

#endif
/**********************************************************************/
#ifdef L_localtime_r

static const unsigned char day_cor[] = { /* non-leap */
	31, 31, 34, 34, 35, 35, 36, 36, 36, 37, 37, 38, 38
/* 	 0,  0,  3,  3,  4,  4,  5,  5,  5,  6,  6,  7,  7 */
/*	    31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 */
};

static int tm_isdst(register const struct tm *__restrict ptm)
{
	register rule_struct *r = _time_tzinfo;
	long sec;
	int i, isdst, isleap, day, day0, monlen, mday, oday;

	isdst = 0;
	if (r[1].tzname[0] != 0) {
		/* First, get the current seconds offset from the start of the year.
		 * Fields of ptm are assumed to be in their normal ranges. */
		sec = ptm->tm_sec
			+ 60 * (ptm->tm_min
					+ 60 * (long)(ptm->tm_hour
								  + 24 * ptm->tm_yday));
		/* Do some prep work. */
		i = (ptm->tm_year % 400) + 1900; /* Make sure we don't overflow. */
		isleap = __isleap(i);
		--i;
		day0 = (1
				+ i				/* Normal years increment 1 wday. */
				+ (i/4)
				- (i/100)
				+ (i/400) ) % 7;
		i = 0;
		do {
			day = r->day;		/* Common for 'J' and # case. */
			if (r->rule_type == 'J') {
				if (!isleap || (day < (31+29))) {
					--day;
				}
			} else if (r->rule_type == 'M') {
				/* Find 0-based day number for 1st of the month. */
				day = 31*r->month - day_cor[r->month -1];
				if (isleap && (day >= 59)) {
					++day;
				}
				monlen = 31 + day_cor[r->month -1] - day_cor[r->month];
				if (isleap && (r->month > 1)) {
					++monlen;
				}
				/* Wweekday (0 is Sunday) of 1st of the month
				 * is (day0 + day) % 7. */
				if ((mday = r->day - ((day0 + day) % 7)) >= 0) {
					mday -= 7;	/* Back up into prev month since r->week>0. */
				}
				if ((mday += 7 * r->week) >= monlen) {
					mday -= 7;
				}
				/* So, 0-based day number is... */
				day += mday;
			}

			if (i != 0) {
				/* Adjust sec since dst->std change time is in dst. */
				sec += (r[-1].gmt_offset - r->gmt_offset);
				if (oday > day) {
					++isdst;	/* Year starts in dst. */
				}
			}
			oday = day;

			/* Now convert day to seconds and add offset and compare. */
			if (sec >= (day * 86400L) + r->dst_offset) {
				++isdst;
			}
			++r;
		} while (++i < 2);
	}
	return (isdst & 1);
}

struct tm *localtime_r(register const time_t *__restrict timer,
					   register struct tm *__restrict result)
{
	time_t x[1];
	long offset;
	int days, dst;

	dst = 0;
	do {
		days = -7;
		offset = 604800L - _time_tzinfo[dst].gmt_offset;
		if (*timer > (LONG_MAX - 604800L)) {
			days = -days;
			offset = -offset;
		}
		*x = *timer + offset;

		_time_t2tm(x, days, result);
		
		if (dst) {
			result->tm_isdst = dst;
			break;
		}
		++dst;
	} while ((result->tm_isdst = tm_isdst(result)) != 0);

	return result;
}

#endif
/**********************************************************************/
#ifdef L_mktime

time_t mktime(struct tm *timeptr)
{
	return  _time_mktime(timeptr, 1);
}

#endif
/**********************************************************************/
#ifdef L_strftime

#define NO_E_MOD		0x80
#define NO_O_MOD		0x40

#define ILLEGAL_SPEC	0x3f

#define INT_SPEC		0x00	/* must be 0x00!! */
#define STRING_SPEC		0x10	/* must be 0x10!! */
#define CALC_SPEC		0x20
#define STACKED_SPEC	0x30

#define MASK_SPEC		0x30

/* Compatibility:
 *
 * No alternate digit (%O?) handling.  Always uses 0-9.
 * Alternate locale format (%E?) handling is broken for nontrivial ERAs.
 * glibc's %P is currently faked by %p.  This means it doesn't do lower case.
 * glibc's %k, %l, and %s are handled.
 * glibc apparently allows (and ignores) extraneous 'E' and 'O' modifiers,
 *   while they are flagged as illegal conversions here.
 */

/* Warning: Assumes ASCII values! (as do lots of other things in the lib...) */
static const unsigned char spec[] = {
	/* A */		0x03 |  STRING_SPEC | NO_E_MOD | NO_O_MOD,
	/* B */		0x04 |  STRING_SPEC | NO_E_MOD | NO_O_MOD,
	/* C */		0x0a |     INT_SPEC            | NO_O_MOD,
	/* D */		0x02 | STACKED_SPEC | NO_E_MOD | NO_O_MOD,
	/* E */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* F */		0x03 | STACKED_SPEC | NO_E_MOD | NO_O_MOD,
	/* G */		0x03 |    CALC_SPEC | NO_E_MOD | NO_O_MOD,
	/* H */		0x0b |     INT_SPEC | NO_E_MOD,
	/* I */		0x0c |     INT_SPEC | NO_E_MOD,
	/* J */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* K */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* L */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* M */		0x0d |     INT_SPEC | NO_E_MOD,
	/* N */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* O */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* P */		0x05 |  STRING_SPEC | NO_E_MOD | NO_O_MOD, /* glibc ; use %p */
	/* Q */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* R */		0x04 | STACKED_SPEC | NO_E_MOD | NO_O_MOD,
	/* S */		0x0e |     INT_SPEC | NO_E_MOD,
	/* T */		0x05 | STACKED_SPEC | NO_E_MOD | NO_O_MOD,
	/* U */		0x04 |    CALC_SPEC | NO_E_MOD,
	/* V */		0x05 |    CALC_SPEC | NO_E_MOD,
	/* W */		0x06 |    CALC_SPEC | NO_E_MOD,
	/* X */		0x0a | STACKED_SPEC            | NO_O_MOD,
	/* Y */		0x0f |     INT_SPEC            | NO_O_MOD,
	/* Z */		0x01 |    CALC_SPEC | NO_E_MOD | NO_O_MOD,
	'?',						/* 26 */
	'?',						/* 27 */
	'?',						/* 28 */
	'?',						/* 29 */
	0,							/* 30 */
	0,							/* 31 */
	/* a */		0x00 |  STRING_SPEC | NO_E_MOD | NO_O_MOD,
	/* b */		0x01 |  STRING_SPEC | NO_E_MOD | NO_O_MOD,
	/* c */		0x08 | STACKED_SPEC            | NO_O_MOD,
	/* d */		0x00 |     INT_SPEC | NO_E_MOD,
	/* e */		0x01 |     INT_SPEC | NO_E_MOD,
	/* f */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* g */		0x02 |    CALC_SPEC | NO_E_MOD | NO_O_MOD,
	/* h */		0x01 |  STRING_SPEC | NO_E_MOD | NO_O_MOD, /* same as b */
	/* i */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* j */		0x08 |     INT_SPEC | NO_E_MOD | NO_O_MOD,
	/* k */		0x03 |     INT_SPEC | NO_E_MOD | NO_O_MOD, /* glibc */
	/* l */		0x04 |     INT_SPEC | NO_E_MOD | NO_O_MOD, /* glibc */
	/* m */		0x05 |     INT_SPEC | NO_E_MOD,
	/* n */		0x00 | STACKED_SPEC | NO_E_MOD | NO_O_MOD,
	/* o */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* p */		0x02 |  STRING_SPEC | NO_E_MOD | NO_O_MOD,
	/* q */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* r */		0x0b | STACKED_SPEC | NO_E_MOD | NO_O_MOD,
	/* s */		0x07 |    CALC_SPEC | NO_E_MOD | NO_O_MOD, /* glibc */
	/* t */		0x01 | STACKED_SPEC | NO_E_MOD | NO_O_MOD,
	/* u */		0x07 |     INT_SPEC | NO_E_MOD,
	/* v */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* w */		0x02 |     INT_SPEC | NO_E_MOD,
	/* x */		0x09 | STACKED_SPEC            | NO_O_MOD,
	/* y */		0x09 |     INT_SPEC,
	/* z */		0x00 |    CALC_SPEC | NO_E_MOD | NO_O_MOD,


	/* WARNING!!! These are dependent on the layout of struct tm!!! */
#define FIELD_MAX (26+6+26)
	60 /* 61? */, 59, 23, 31, 11, 0 /* 9999 */, 6, 0 /* 365 */,

#define TP_OFFSETS (FIELD_MAX+8)
	3, /* d */
	3, /* e */
	6, /* w */
	2, /* k */
	2, /* l */
	4, /* m */
	0, /* CURRENTLY UNUSED */
	/* NOTE: u,j,y order must be preserved as 6,7,5 seq is used in the code! */
#define CALC_OFFSETS (TP_OFFSETS + 7)
	6, /* u */
	7, /* j */
	5, /* y */
	5, /* C */
	2, /* H */
	2, /* I */
	1, /* M */
	0, /* S */
	5, /* Y */
	6, /* a */
	4, /* b, h */
	2, /* p */
	6, /* A */
	4, /* B */
	2, /* P */

#define TP_CODES (TP_OFFSETS + 16 + 6)
	2 | 16, /* d */
	2, /* e */
	0 | 16, /* w */
	2, /* k */
	2 | 32 | 0, /* l */
	2 | 16 | 1, /* m */
	0, /* CURRENTLY UNUSED */
	0 | 16 | 8 , /* u */
	4 | 16 | 1, /* j */
	2 | 128 | 32 | 16 , /* y */
	2 | 128 | 64 | 32 | 16 , /* C */
	2 | 16, /* H */
	2 | 32 | 16 | 0, /* I */
	2 | 16, /* M */
	2 | 16, /* S */
	6 | 16, /* Y */
	2, /* a */
	2, /* b, h */
	2 | 64, /* p */
	2, /* A */
	2, /* B */
	2 | 64, /* P */

#define STRINGS_NL_ITEM_START (TP_CODES + 16 + 6)
	_NL_ITEM_INDEX(ABDAY_1),	/* a */
	_NL_ITEM_INDEX(ABMON_1),	/* b, h */
	_NL_ITEM_INDEX(AM_STR),		/* p */
	_NL_ITEM_INDEX(DAY_1),		/* A */
	_NL_ITEM_INDEX(MON_1),		/* B */
	_NL_ITEM_INDEX(AM_STR),		/* P -- wrong! need lower case */

#define STACKED_STRINGS_START (STRINGS_NL_ITEM_START+6)
	6, 7, 8, 16, 24, 29,		/* 6 - offsets from offset-count to strings */
	'\n', 0,					/* 2 */
	'\t', 0,					/* 2 */
	'%', 'm', '/', '%', 'd', '/', '%', 'y', 0, /* 9 - %D */
	'%', 'Y', '-', '%', 'm', '-', '%', 'd', 0, /* 9 - %F (glibc extension) */
	'%', 'H', ':', '%', 'M', 0,	/* 6 - %R*/
	'%', 'H', ':', '%', 'M', ':', '%', 'S', 0, /* 9 - %T */

#define STACKED_STRINGS_NL_ITEM_START (STACKED_STRINGS_START + 43)
	_NL_ITEM_INDEX(D_T_FMT),	/* c */
	_NL_ITEM_INDEX(D_FMT),		/* x */
	_NL_ITEM_INDEX(T_FMT),		/* X */
	_NL_ITEM_INDEX(T_FMT_AMPM), /* r */
#ifdef ENABLE_ERA_CODE
	_NL_ITEM_INDEX(ERA_D_T_FMT), /* Ec */
	_NL_ITEM_INDEX(ERA_D_FMT),	/* Ex */
	_NL_ITEM_INDEX(ERA_T_FMT),	/* EX */
#endif
};

static int load_field(int k, const struct tm *__restrict timeptr)
{
	int r;
	int r_max;

	r = ((int *) timeptr)[k];

	r_max = spec[FIELD_MAX + k];

	if (k == 7) {
		r_max = 365;
	} else if (k == 5) {
		r += 1900;
		r_max = 9999;
	}

	if ((((unsigned int) r) > r_max) || ((k == 3) && !r)) {
		r = -1;
	}

	return r;
}

#define MAX_PUSH 4

size_t strftime(char *__restrict s, size_t maxsize,
				const char *__restrict format,
				const struct tm *__restrict timeptr)
{
	long tzo;
	register const char *p;
	register const char *o;
	const rule_struct *rsp;
	const char *stack[MAX_PUSH];
	size_t count;
	size_t o_count;
	int field_val, i, j, lvl;
	int x[3];			/* wday, yday, year */
	int isofm, days;
	char buf[__UIM_BUFLEN_LONG];
	unsigned char mod;
	unsigned char code;

	tzset();					/* We'll, let's get this out of the way. */

	lvl = 0;
	p = format;
	count = maxsize;

 LOOP:
	if (!count) {
		return 0;
	}
	if (!*p) {
		if (lvl == 0) {
			*s = 0;				/* nul-terminate */
			return maxsize - count;
		}
		p = stack[--lvl];
		goto LOOP;
	}

	o_count = 1;
	if ((*(o = p) == '%') && (*++p != '%')) {
		o_count = 2;
		mod = ILLEGAL_SPEC;
		if ((*p == 'O') || (*p == 'E')) { /* modifier */
			mod |= ((*p == 'O') ? NO_O_MOD : NO_E_MOD);
			++o_count;
			++p;
		}
		if ((((unsigned char)(((*p) | 0x20) - 'a')) >= 26)
			|| (((code = spec[(int)(*p - 'A')]) & mod) >= ILLEGAL_SPEC)
			) {
			if (!*p) {
				--p;
				--o_count;
			}
			goto OUTPUT;
		}
		code &= ILLEGAL_SPEC;	/* modifiers are preserved in mod var. */

		if ((code & MASK_SPEC) == STACKED_SPEC) {
			if (lvl == MAX_PUSH) {
				goto OUTPUT;	/* Stack full so treat as illegal spec. */
			}
			stack[lvl++] = ++p;
			if ((code &= 0xf) < 8) {
				p = ((const char *) spec) + STACKED_STRINGS_START + code;
				p += *((unsigned char *)p);
				goto LOOP;
			}
			p = ((const char *) spec) + STACKED_STRINGS_NL_ITEM_START
				+ (code & 7);
#ifdef ENABLE_ERA_CODE
			if ((mod & NO_E_MOD) /* Actually, this means E modifier present. */
				&& (*(o = nl_langinfo(_NL_ITEM(LC_TIME,
											   (int)(((unsigned char *)p)[4]))
									  )))
				) {
				p = o;
				goto LOOP;
			}
#endif
			p = nl_langinfo(_NL_ITEM(LC_TIME,
									 (int)(*((unsigned char *)p))));
			goto LOOP;
		}

		o = spec + 26;		/* set to "????" */
		if ((code & MASK_SPEC) == CALC_SPEC) {

			if (*p == 's') {
				time_t t;

				/* Use a cast to silence the warning since *timeptr won't
				 * be changed. */
				if ((t = _time_mktime((struct tm *) timeptr, 0))
					== ((time_t) -1)
					) {
					o_count = 1;
					goto OUTPUT;
				}
#ifdef TIME_T_IS_UNSIGNED
				o = _uintmaxtostr(buf + sizeof(buf) - 1,
								  (uintmax_t) t,
								  10, __UIM_DECIMAL);
#else
				o = _uintmaxtostr(buf + sizeof(buf) - 1,
								  (uintmax_t) t,
								  -10, __UIM_DECIMAL);
#endif
				o_count = sizeof(buf);
				goto OUTPUT;
			} else if (((*p) | 0x20) == 'z') { /* 'z' or 'Z' */

				if (timeptr->tm_isdst < 0) {
					/* SUSv3 specifies this behavior for 'z', but we'll also
					 * treat it as "no timezone info" for 'Z' too. */
					o_count = 0;
					goto OUTPUT;
				}

				rsp = _time_tzinfo;
				if (timeptr->tm_isdst > 0) {
					++rsp;
				}

				if (*p == 'Z') {
					o = rsp->tzname;
					assert(o != NULL);
#if 0
					if (!o) {	/* PARANOIA */
						o = spec+30; /* empty string */
					}
#endif
					o_count = SIZE_MAX;
					goto OUTPUT;
				} else {		/* z */
					*s = '+';
					if ((tzo = -rsp->gmt_offset) < 0) {
						tzo = -tzo;
						*s = '-';
					}
					++s;
					--count;

					i = tzo / 60;
					field_val = ((i / 60) * 100) + (i % 60);
			
					i = 16 + 6;	/* 0-fill, width = 4 */
				}
			} else {
				/* TODO: don't need year for U, W */
				for (i=0 ; i < 3 ; i++) {
					if ((x[i] = load_field(spec[CALC_OFFSETS+i],timeptr)) < 0) {
						goto OUTPUT;
					}
				}

				i = 16 + 2;		/* 0-fill, width = 2 */

				if ((*p == 'U') || (*p == 'W')) {
					field_val = ((x[1] - x[0]) + 7);
					if (*p == 'W') {
						++field_val;
					}
					field_val /= 7;
					if ((*p == 'W') && !x[0]) {
						--field_val;
					}
				} else {	/* ((*p == 'g') || (*p == 'G') || (*p == 'V')) */
				ISO_LOOP:
					isofm = (((x[1] - x[0]) + 11) % 7) - 3;	/* [-3,3] */

					if (x[1] < isofm) {	/* belongs to previous year */
						--x[2];
						x[1] += 365 + __isleap(x[2]);
						goto ISO_LOOP;
					}

					field_val = ((x[1] - isofm) / 7) + 1; /* week # */
					days = 365 + __isleap(x[2]);
					isofm = ((isofm + 7*53 + 3 - days)) %7 + days - 3; /* next year */
					if (x[1] >= isofm) { /* next year */
						x[1] -= days;
						++x[2];
						goto ISO_LOOP;
					}

					if (*p != 'V') { /* need year */
						field_val = x[2]; /* TODO: what if x[2] now 10000 ?? */
						if (*p == 'g') {
							field_val %= 100;
						} else {
							i = 16 + 6;	/* 0-fill, width = 4 */
						}
					}
				}
			}
		} else {
			i = TP_OFFSETS + (code & 0x1f);
			if ((field_val = load_field(spec[i],timeptr)) < 0) {
				goto OUTPUT;
			}

			i = spec[i+(TP_CODES - TP_OFFSETS)];

			j = (i & 128) ? 100: 12;
			if (i & 64) {
				field_val /= j;;
			}
			if (i & 32) {
				field_val %= j;
				if (((i&128) + field_val) == 0) { /* mod 12? == 0 */
					field_val = j; /* set to 12 */
				}
			}
			field_val += (i & 1);
			if ((i & 8) && !field_val) {
				field_val += 7;
			}
		}
		
		if ((code & MASK_SPEC) == STRING_SPEC) {
			o_count = SIZE_MAX;
			field_val += spec[STRINGS_NL_ITEM_START + (code & 0xf)];
			o = nl_langinfo(_NL_ITEM(LC_TIME, field_val));
		} else {
			o_count = ((i >> 1) & 3) + 1;
			o = buf + o_count;
			do {
				*(char *)(--o) = '0' + (field_val % 10);
				field_val /= 10;
			} while (o > buf);
			if (*buf == '0') {
				*buf = ' ' + (i & 16);
			}
		}
	}

 OUTPUT:
	++p;
	while (o_count && count && *o) {
		*s++ = *o++;
		--o_count;
		--count;
	}
	goto LOOP;
}

#endif
/**********************************************************************/
#ifdef L_strptime

/* TODO:
 * 1) %l and %k are space-padded, so "%l" by itself fails while " %l" succeeds.
 *    Both work for glibc.  So, should we always strip spaces?
 * 2) %Z
 */

/* Notes:
 * There are several differences between this strptime and glibc's strptime.
 * 1) glibc strips leading space before numeric conversions.
 * 2) glibc will read fields without whitespace in between.  SUSv3 states
 *    that you must have whitespace between conversion operators.  Besides,
 *    how do you know how long a number should be if there are leading 0s?
 * 3) glibc attempts to compute some the struct tm fields based on the
 *    data retrieved; tm_wday in particular.  I don't as I consider it
 *     another glibc attempt at mind-reading...
 */

#define NO_E_MOD		0x80
#define NO_O_MOD		0x40

#define ILLEGAL_SPEC	0x3f

#define INT_SPEC		0x00	/* must be 0x00!! */
#define STRING_SPEC		0x10	/* must be 0x10!! */
#define CALC_SPEC		0x20
#define STACKED_SPEC	0x30

#define MASK_SPEC		0x30

/* Warning: Assumes ASCII values! (as do lots of other things in the lib...) */
static const unsigned char spec[] = {
	/* A */		0x02 |  STRING_SPEC | NO_E_MOD | NO_O_MOD,
	/* B */		0x01 |  STRING_SPEC | NO_E_MOD | NO_O_MOD,
	/* C */		0x08 |     INT_SPEC            | NO_O_MOD,
	/* D */		0x01 | STACKED_SPEC | NO_E_MOD | NO_O_MOD,
	/* E */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* F */		0x02 | STACKED_SPEC | NO_E_MOD | NO_O_MOD, /* glibc */
	/* G */		0x0f |     INT_SPEC | NO_E_MOD | NO_O_MOD, /* glibc */
	/* H */		0x06 |     INT_SPEC | NO_E_MOD,
	/* I */		0x07 |     INT_SPEC | NO_E_MOD,
	/* J */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* K */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* L */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* M */		0x04 |     INT_SPEC | NO_E_MOD,
	/* N */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* O */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* P */		0x00 |  STRING_SPEC | NO_E_MOD | NO_O_MOD, /* glibc */
	/* Q */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* R */		0x03 | STACKED_SPEC | NO_E_MOD | NO_O_MOD,
	/* S */		0x05 |     INT_SPEC | NO_E_MOD,
	/* T */		0x04 | STACKED_SPEC | NO_E_MOD | NO_O_MOD,
	/* U */		0x0c |     INT_SPEC | NO_E_MOD,
	/* V */		0x0d |     INT_SPEC | NO_E_MOD | NO_O_MOD, /* glibc */
	/* W */		0x0c |     INT_SPEC | NO_E_MOD,
	/* X */		0x0a | STACKED_SPEC            | NO_O_MOD,
	/* Y */		0x0a |     INT_SPEC            | NO_O_MOD,
	/* Z */		0x02 |    CALC_SPEC | NO_E_MOD | NO_O_MOD, /* glibc */

	/* WARNING! This assumes orderings:
	 *    AM,PM
	 *    ABDAY_1-ABDAY-7,DAY_1-DAY_7
	 *    ABMON_1-ABMON_12,MON_1-MON12
	 * Also, there are exactly 6 bytes between 'Z' and 'a'.
	 */
#define STRINGS_NL_ITEM_START (26)
	_NL_ITEM_INDEX(AM_STR),		/* p (P) */
	_NL_ITEM_INDEX(ABMON_1),	/* B, b */
	_NL_ITEM_INDEX(ABDAY_1),	/* A, a */
	2,
	24,
	14,

	/* a */		0x02 |  STRING_SPEC | NO_E_MOD | NO_O_MOD,
	/* b */		0x01 |  STRING_SPEC | NO_E_MOD | NO_O_MOD,
	/* c */		0x08 | STACKED_SPEC            | NO_O_MOD,
	/* d */		0x00 |     INT_SPEC | NO_E_MOD,
	/* e */		0x00 |     INT_SPEC | NO_E_MOD,
	/* f */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* g */		0x0e |     INT_SPEC | NO_E_MOD | NO_O_MOD, /* glibc */
	/* h */		0x01 |  STRING_SPEC | NO_E_MOD | NO_O_MOD,
	/* i */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* j */		0x01 |     INT_SPEC | NO_E_MOD | NO_O_MOD,
	/* k */		0x06 |     INT_SPEC | NO_E_MOD,            /* glibc */
	/* l */		0x07 |     INT_SPEC | NO_E_MOD,            /* glibc */
	/* m */		0x02 |     INT_SPEC | NO_E_MOD,
	/* n */		0x00 | STACKED_SPEC | NO_E_MOD | NO_O_MOD,
	/* o */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* p */		0x00 |  STRING_SPEC | NO_E_MOD | NO_O_MOD,
	/* q */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* r */		0x0b | STACKED_SPEC | NO_E_MOD | NO_O_MOD,
	/* s */		0x00 |    CALC_SPEC | NO_E_MOD | NO_O_MOD, /* glibc */
	/* t */		0x00 | STACKED_SPEC | NO_E_MOD | NO_O_MOD,
	/* u */		0x0b |     INT_SPEC | NO_E_MOD | NO_O_MOD, /* glibc */
	/* v */		       ILLEGAL_SPEC | NO_E_MOD | NO_O_MOD,
	/* w */		0x03 |     INT_SPEC | NO_E_MOD,
	/* x */		0x09 | STACKED_SPEC            | NO_O_MOD,
	/* y */		0x09 |     INT_SPEC,
	/* z */		0x01 |    CALC_SPEC | NO_E_MOD | NO_O_MOD, /* glibc */

#define INT_FIELD_START (26+6+26)
	/* (field #) << 3  + lower bound (0|1) + correction 0:none, 2:-1, 4:-1900
	 * followed by upper bound prior to correction with 1=>366 and 2=>9999. */
	/* d, e */	(3 << 3) + 1 + 0, 31,
	/* j */		(7 << 3) + 1 + 2, /* 366 */ 1,
	/* m */		(4 << 3) + 1 + 2, 12,
	/* w */		(6 << 3) + 0 + 0, 6,
	/* M */		(1 << 3) + 0 + 0, 59,
	/* S */		0        + 0 + 0, 60,
	/* H (k) */	(2 << 3) + 0 + 0, 23,
	/* I (l) */	(9 << 3) + 1 + 0, 12, /* goes with 8 -- am/pm */
	/* C */		(10<< 3) + 0 + 0, 99,
	/* y */		(11<< 3) + 0 + 0, 99,
	/* Y */		(5 << 3) + 0 + 4, /* 9999 */ 2,
	/* u */		(6 << 3) + 1 + 0, 7,
	/* The following are processed and range-checked, but ignored otherwise. */
	/* U, W */	(12<< 3) + 0 + 0, 53,
	/* V */		(12<< 3) + 1 + 0, 53,
	/* g */		(12<< 3) + 0 + 0, 99,
	/* G */		(12<< 3) + 0 /*+ 4*/, /* 9999 */ 2, /* Note: -1 or 10000? */

#define STACKED_STRINGS_START (INT_FIELD_START+32)
	5, 6, 14, 22, 27,			/* 5 - offsets from offset-count to strings */
	' ', 0,						/* 2 - %n or %t */
	'%', 'm', '/', '%', 'd', '/', '%', 'y', 0, /* 9 - %D */
	'%', 'Y', '-', '%', 'm', '-', '%', 'd', 0, /* 9 - %F (glibc extension) */
	'%', 'H', ':', '%', 'M', 0,	/* 6 - %R*/
	'%', 'H', ':', '%', 'M', ':', '%', 'S', 0, /* 9 - %T */

#define STACKED_STRINGS_NL_ITEM_START (STACKED_STRINGS_START + 40)
	_NL_ITEM_INDEX(D_T_FMT),	/* c */
	_NL_ITEM_INDEX(D_FMT),		/* x */
	_NL_ITEM_INDEX(T_FMT),		/* X */
	_NL_ITEM_INDEX(T_FMT_AMPM), /* r */
#ifdef ENABLE_ERA_CODE
	_NL_ITEM_INDEX(ERA_D_T_FMT), /* Ec */
	_NL_ITEM_INDEX(ERA_D_FMT),	/* Ex */
	_NL_ITEM_INDEX(ERA_T_FMT),	/* EX */
#endif
};

#define MAX_PUSH 4

char *strptime(const char *__restrict buf, const char *__restrict format,
			   struct tm *__restrict tm)
{
	register const char *p;
	char *o;
	const char *stack[MAX_PUSH];
	int i, j, lvl;
	int fields[13];
	unsigned char mod;
	unsigned char code;

	i = 0;
	do {
		fields[i] = INT_MIN;
	} while (++i < 13);

	lvl = 0;
	p = format;

 LOOP:
	if (!*p) {
		if (lvl == 0) {			/* Done. */
			if (fields[6] == 7) { /* Cleanup for %u here since just once. */
				fields[6] = 0;	/* Don't use mod in case unset. */
			}

			i = 0;
			do {				/* Store the values into tm. */
				((int *) tm)[i] = fields[i];
			} while (++i < 8);

			return (char *) buf; /* Success. */
		}
		p = stack[--lvl];
		goto LOOP;
	}

	if ((*p == '%') && (*++p != '%')) {
		mod = ILLEGAL_SPEC;
		if ((*p == 'O') || (*p == 'E')) { /* Modifier? */
			mod |= ((*p == 'O') ? NO_O_MOD : NO_E_MOD);
			++p;
		}

		if (!*p
			|| (((unsigned char)(((*p) | 0x20) - 'a')) >= 26)
			|| (((code = spec[(int)(*p - 'A')]) & mod) >= ILLEGAL_SPEC)
			) {
			return NULL;		/* Illegal spec. */
		}

		if ((code & MASK_SPEC) == STACKED_SPEC) {
			if (lvl == MAX_PUSH) {
				return NULL;	/* Stack full so treat as illegal spec. */
			}
			stack[lvl++] = ++p;
			if ((code &= 0xf) < 8) {
				p = ((const char *) spec) + STACKED_STRINGS_START + code;
				p += *((unsigned char *)p);
				goto LOOP;
			}

			p = ((const char *) spec) + STACKED_STRINGS_NL_ITEM_START
				+ (code & 7);
#ifdef ENABLE_ERA_CODE
			if ((mod & NO_E_MOD) /* Actually, this means E modifier present. */
				&& (*(o = nl_langinfo(_NL_ITEM(LC_TIME,
											   (int)(((unsigned char *)p)[4]))
									  )))
				) {
				p = o;
				goto LOOP;
			}
#endif
			p = nl_langinfo(_NL_ITEM(LC_TIME,
									 (int)(*((unsigned char *)p))));
			goto LOOP;
		}

		++p;

		if ((code & MASK_SPEC) == STRING_SPEC) {
			code &= 0xf;
			j = spec[STRINGS_NL_ITEM_START + 3 + code];
			i = _NL_ITEM(LC_TIME, spec[STRINGS_NL_ITEM_START + code]);
			/* Go backwards to check full names before abreviations. */
			do {
				--j;
				o = nl_langinfo(i+j);
				if (!strncasecmp(buf,o,strlen(o)) && *o) { /* Found a match. */
					do {
						++buf;
					} while (*++o);
					if (!code) { /* am/pm */
						fields[8] = j * 12;
						if (fields[9] >= 0) { /* We have a previous %I or %l. */
							fields[2] = fields[9] + fields[8];
						}
					} else {	/* day (4) or month (6) */
						fields[2 + (code << 1)]
							= j % (spec[STRINGS_NL_ITEM_START + 3 + code] >> 1);
					}
					goto LOOP;
				}
			} while (j);
			return NULL;		/* Failed to match. */
		}

		if ((code & MASK_SPEC) == CALC_SPEC) {
			if ((code &= 0xf) < 1) { /* s or z*/
				time_t t;

				o = (char *) buf;
				i = errno;
				__set_errno(0);
				if (!isspace(*buf)) { /* Signal an error if whitespace. */
#ifdef TIME_T_IS_UNSIGNED
					t = strtoul(buf, &o, 10);
#else
					t = strtol(buf, &o, 10);
#endif
				}
				if ((o == buf) || errno) { /* Not a number or overflow. */
					return NULL;
				}
				__set_errno(i);	/* Restore errno. */
				buf = o;

				if (!code) {	/* s */
					localtime_r(&t, tm); /* TODO: check for failure? */
					i = 0;
					do {		/* Now copy values from tm to fields. */
						 fields[i] = ((int *) tm)[i];
					} while (++i < 8);
				}
			}
			/* TODO: glibc treats %Z as a nop.  For now, do the same. */
			goto LOOP;
		}

		assert((code & MASK_SPEC) == INT_SPEC);
		{
			register const unsigned char *x;
			code &= 0xf;
			x = spec + INT_FIELD_START + (code << 1);
			if ((j = x[1]) < 3) { /* upper bound (inclusive) */
				j = ((j==1) ? 366 : 9999);
			}
			i = -1;
			while (isdigit(*buf)) {
				if (i < 0) {
					i = 0;
				}
				if ((i = 10*i + (*buf - '0')) > j) { /* Overflow. */
					return NULL;
				}
				++buf;
			}
			if (i < (*x & 1)) {	/* This catches no-digit case too. */
				return NULL;
			}
			if (*x & 2) {
				--i;
			}
			if (*x & 4) {
				i -= 1900;
			}

			if (*x == (9 << 3) + 1 + 0) { /* %I or %l */
				if (i == 12) {
					i = 0;
				}
				if (fields[8] >= 0) { /* We have a previous %p or %P. */
					fields[2] = i + fields[8];
				}
			}

			fields[(*x) >> 3] = i;

			if (((unsigned char)(*x - (10<< 3) + 0 + 0)) <= 8) { /* %C or %y */
				if ((j = fields[10]) < 0) {	/* No %C, so i must be %y data. */
					if (i <= 68) { /* Map [0-68] to 2000+i */
						i += 100;
					}
				} else {		/* Have %C data, but what about %y? */
					if ((i = fields[11]) < 0) {	/* No %y data. */
						i = 0;	/* Treat %y val as 0 following glibc's example. */
					}
					i += 100*(j - 19);
				}
				fields[5] = i;
			}
		}
		goto LOOP;
	} else if (isspace(*p)) {
		++p;
		while (isspace(*buf)) {
			++buf;
		}
		goto LOOP;
	} else if (*buf++ == *p++) {
		goto LOOP;
	}
	return NULL;
}

#endif
/**********************************************************************/
#ifdef L_time

#ifndef __BCC__
#error The uClibc version of time is in sysdeps/linux/common.
#endif

time_t time(register time_t *tloc)
{
	struct timeval tv;
	register struct timeval *p = &tv;

	gettimeofday(p, NULL);		/* This should never fail... */

	if (tloc) {
		*tloc = p->tv_sec;
	}

	return p->tv_sec;
}

#endif
/**********************************************************************/
#ifdef L_tzset

static const char vals[] = {
	'T', 'Z', 0,				/* 3 */
	'U', 'T', 'C', 0,			/* 4 */
	25, 60, 60, 1,				/* 4 */
	'.', 1,						/* M */
	5, '.', 1,
	6,  0,  0,					/* Note: overloaded for non-M non-J case... */
	0, 1, 0,					/* J */
	',', 'M',      '4', '.', '1', '.', '0',
	',', 'M', '1', '0', '.', '5', '.', '0', 0
};

#define TZ    vals
#define UTC   (vals + 3)
#define RANGE (vals + 7)
#define RULE  (vals + 11 - 1)
#define DEFAULT_RULES (vals + 22)

/* Initialize to UTC. */
int daylight = 0;
long timezone = 0;
char *tzname[2] = { (char *) UTC, (char *) (UTC-1) };

rule_struct _time_tzinfo[2];

static const char *getoffset(register const char *e, long *pn)
{
	register const char *s = RANGE-1;
	long n;
	int f;

	n = 0;
	f = -1;
	do {
		++s;
		if (isdigit(*e)) {
			f = *e++ - '0';
		}
		if (isdigit(*e)) {
			f = 10 * f + (*e++ - '0');
		}
		if (((unsigned int)f) >= *s) {
			return NULL;
		}
		n = (*s) * n + f;
		f = 0;
		if (*e == ':') {
			++e;
			--f;
		}
	} while (*s > 1);

	*pn = n;
	return e;
}

static const char *getnumber(register const char *e, int *pn)
{
#ifdef __BCC__
	/* bcc can optimize the counter if it thinks it is a pointer... */
	register const char *n = (const char *) 3;
	int f;

	f = 0;
	while (n && isdigit(*e)) {
		f = 10 * f + (*e++ - '0');
		--n;
	}

	*pn = f;
	return (n == (const char *) 3) ? NULL : e;
#else  /* __BCC__ */
	int n, f;

	n = 3;
	f = 0;
	while (n && isdigit(*e)) {
		f = 10 * f + (*e++ - '0');
		--n;
	}

	*pn = f;
	return (n == 3) ? NULL : e;
#endif /* __BCC__ */
}

void tzset(void)
{
	register const char *e;
	register char *s;
	long off;
	short *p;
	rule_struct new_rules[2];
	int n, count, f;
	char c;

	if (!(e = getenv(TZ)) || !*e) { /* Not set or set to empty string. */
	ILLEGAL:					/* TODO: Clean up the following... */
		s = _time_tzinfo[0].tzname;
		*s = 'U';
		*++s = 'T';
		*++s = 'C';
		*++s =
		*_time_tzinfo[1].tzname = 0;
		_time_tzinfo[0].gmt_offset = 0;
		goto DONE;
	}


	if (*e == ':') {			/* Ignore leading ':'. */
		++e;
	}
	
	count = 0;
	new_rules[1].tzname[0] = 0;
 LOOP:
	/* Get std or dst name. */
	c = 0;
	if (*e == '<') {
		++e;
		c = '>';
	}

	s = new_rules[count].tzname;
	n = 0;
	while (*e
		   && (isalpha(*e)
			   || (c && (isdigit(*e) || (*e == '+') || (*e == '-'))))
		   ) {
		*s++ = *e++;
		if (++n > TZNAME_MAX) {
			goto ILLEGAL;
		}
	}
	*s = 0;

	if ((n < 3)					/* Check for minimum length. */
		|| (c && (*e++ != c))	/* Match any quoting '<'. */
		) {
		goto ILLEGAL;
	}

	/* Get offset */
	s = (char *) e;
	if ((*e != '-') && (*e != '+')) {
		if (count && !isdigit(*e)) {
			off -= 3600;		/* Default to 1 hour ahead of std. */
			goto SKIP_OFFSET;
		}
		--e;
	}

	++e;
	if (!(e = getoffset(e, &off))) {
		goto ILLEGAL;
	}

	if (*s == '-') {
		off = -off;				/* Save off in case needed for dst default. */
	}
 SKIP_OFFSET:
	new_rules[count].gmt_offset = off;

	if (!count) {
		if (*e) {
			++count;
			goto LOOP;
		}
	} else {					/* OK, we have dst, so get some rules. */
		count = 0;
		if (!*e) {				/* No rules so default to US rules. */
			e = DEFAULT_RULES;
		}

		do {
			if (*e++ != ',') {
				goto ILLEGAL;
			}

			n = 365;
			s = (char *) RULE;
			if ((c = *e++) == 'M') {
				n = 12;
			} else if (c == 'J') {
				s += 8;
			} else {
				--e;
				c = 0;
				s += 6;
			}

			*(p = &new_rules[count].rule_type) = c;
			if (c != 'M') {
				p -= 2;
			}

			do {
				++s;
				if (!(e = getnumber(e, &f))
					|| (((unsigned int)(f - s[1])) > n)
					|| (*s && (*e++ != *s))
					) {
					goto ILLEGAL;
				}
				*--p = f;
			} while ((n = *(s += 2)) > 0);

			off = 2 * 60 * 60;	/* Default to 2:00:00 */
			if (*e == '/') {
				++e;
				if (!(e = getoffset(e, &off))) {
					goto ILLEGAL;
				}
			}
			new_rules[count].dst_offset = off;
		} while (++count < 2);

		if (*e) {
			goto ILLEGAL;
		}
	}

	memcpy(_time_tzinfo, new_rules, sizeof(new_rules));
 DONE:
	tzname[0] = _time_tzinfo[0].tzname;
	tzname[1] = _time_tzinfo[1].tzname;
	daylight = !!new_rules[1].tzname[0];
	timezone = new_rules[0].gmt_offset;
}

#endif
/**********************************************************************/
/*  #ifdef L_utime */

/* utime is a syscall in both linux and elks. */
/*  int utime(const char *path, const struct utimbuf *times) */

/*  #endif */
/**********************************************************************/
/* Non-SUSv3 */
/**********************************************************************/
#ifdef L_utimes

#ifndef __BCC__
#error The uClibc version of utimes is in sysdeps/linux/common.
#endif

#include <utime.h>
#include <sys/time.h>

int utimes(const char *filename, register const struct timeval *tvp)
{
	register struct utimbuf *p = NULL;
	struct utimbuf utb;

	if (tvp) {
		p = &utb;
		p->actime = tvp[0].tv_sec;
		p->modtime = tvp[1].tv_sec;
	}
	return utime(filename, p);
}

#endif
/**********************************************************************/
#ifdef L__time_t2tm

static const uint16_t vals[] = {
	60, 60, 24, 7 /* special */, 36524, 1461, 365, 0
};

static const unsigned char days[] = {
	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, /* non-leap */
	    29,
};

/* Notes:
 * If time_t is 32 bits, then no overflow is possible.
 * It time_t is > 32 bits, this needs to be adjusted to deal with overflow.
 */

/* Note: offset is the correction in _days_ to *timer! */

struct tm *_time_t2tm(const time_t *__restrict timer,
					  int offset, struct tm *__restrict result)
{
	register int *p;
	time_t t1, t, v;
	int wday;

	{
		register const uint16_t *vp;
		t = *timer;
		p = (int *) result;
		p[7] = 0;
		vp = vals;
		do {
			if ((v = *vp) == 7) {
				/* Overflow checking, assuming time_t is long int... */
#if (LONG_MAX > INT_MAX) && (LONG_MAX > 2147483647L)
#if (INT_MAX == 2147483647L) && (LONG_MAX == 9223372036854775807L)
				/* Valid range for t is [-784223472856L, 784223421720L].
				 * Outside of this range, the tm_year field will overflow. */
				if (((unsigned long)(t + offset- -784223472856L))
					> (784223421720L - -784223472856L)
					) {
					return NULL;
				}
#else
#error overflow conditions unknown
#endif
#endif

				/* We have days since the epoch, so caluclate the weekday. */
#if defined(__BCC__) && TIME_T_IS_UNSIGNED
				wday = (t + 4) % (*vp);	/* t is unsigned */
#else
				wday = ((int)((t % (*vp)) + 11)) % ((int)(*vp)); /* help bcc */
#endif
				/* Set divisor to days in 400 years.  Be kind to bcc... */
				v = ((time_t)(vp[1])) << 2;
				++v;
				/* Change to days since 1/1/1601 so that for 32 bit time_t
				 * values, we'll have t >= 0.  This should be changed for
				 * archs with larger time_t types. 
				 * Also, correct for offset since a multiple of 7. */

				/* TODO: Does this still work on archs with time_t > 32 bits? */
				t += (135140L - 366) + offset; /* 146097 - (365*30 + 7) -366 */
			}
#if defined(__BCC__) && TIME_T_IS_UNSIGNED
			t -= ((t1 = t / v) * v);
#else
			if ((t -= ((t1 = t / v) * v)) < 0) {
				t += v;
				--t1;
			}
#endif

			if ((*vp == 7) && (t == v-1)) {
				--t;			/* Correct for 400th year leap case */
				++p[4];			/* Stash the extra day... */
			}

#if defined(__BCC__) && 0
			*p = t1;
			if (v <= 60) {
				*p = t;
				t = t1;
			}
			++p;
#else
			if (v <= 60) {
				*p++ = t;
				t = t1;
			} else {
				*p++ = t1;
			}
#endif
		} while (*++vp);
	}

	if (p[-1] == 4) {
		--p[-1];
		t = 365;
	}


	*p += ((int) t);			/* result[7] .. tm_yday */

	p -= 2;						/* at result[5] */

#if (LONG_MAX > INT_MAX) && (LONG_MAX > 2147483647L)
	/* Protect against overflow.  TODO: Unecessary if int arith wraps? */
	*p = ((((p[-2]<<2) + p[-1])*25 + p[0])<< 2) + (p[1] - 299); /* tm_year */
#else
	*p = ((((p[-2]<<2) + p[-1])*25 + p[0])<< 2) + p[1] - 299; /* tm_year */
#endif

	p[1] = wday;				/* result[6] .. tm_wday */

	{
		register const unsigned char *d = days;

		wday = 1900 + *p;
		if (__isleap(wday)) {
			d += 11;
		}

		wday = p[2] + 1;		/* result[7] .. tm_yday */
		*--p = 0;				/* at result[4] .. tm_mon */
		while (wday > *d) {
			wday -= *d;
			if (*d == 29) {
				d -= 11;		/* Backup to non-leap Feb. */
			}
			++d;
			++*p;				/* Increment tm_mon. */
		}
		p[-1] = wday;			/* result[3] .. tm_mday */
	}
	/* TODO -- should this be 0? */
	p[4] = 0;					/* result[8] .. tm_isdst */

	return result;
}

#endif
/**********************************************************************/
#ifdef L___time_tm

struct tm __time_tm;	/* Global shared by gmtime() and localtime(). */

#endif
/**********************************************************************/
#ifdef L__time_mktime

static const unsigned char vals[] = {
	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, /* non-leap */
	    29,
};

time_t _time_mktime(struct tm *timeptr, int store_on_success)
{
#ifdef __BCC__
	long days, secs;
#else
	long long secs;
#endif
	time_t t;
	struct tm x;
	/* 0:sec  1:min  2:hour  3:mday  4:mon  5:year  6:wday  7:yday  8:isdst */
	register int *p = (int *) &x;
	register const unsigned char *s;
	int d;

	tzset();

	memcpy(p, timeptr, sizeof(struct tm));

	d = 400;
	p[5] = (p[5] - ((p[6] = p[5]/d) * d)) + (p[7] = p[4]/12);
	if ((p[4] -= 12 * p[7]) < 0) {
		p[4] += 12;
		--p[5];
	}

	s = vals;
	d = (p[5] += 1900);			/* Correct year.  Now between 1900 and 2300. */
	if (__isleap(d)) {
		s += 11;
	}
	
	p[7] = 0;
	d = p[4];
	while (d) {
		p[7] += *s;
		if (*s == 29) {
			s -= 11;			/* Backup to non-leap Feb. */
		}
		++s;
		--d;
	}

#ifdef __BCC__
	/* TODO - check */
	d = p[5] - 1;
	days = -719163L + d*365 + ((d/4) - (d/100) + (d/400) + p[3] + p[7]);
	secs = p[0] + 60*( p[1] + 60*((long)(p[2])) );

	if (secs < 0) {
		secs += 120009600L;
		days -= 1389;
	}
	if ( ((unsigned long)(days + secs/86400L)) > 49710L) {
		return -1;
	}
	secs += (days * 86400L);
#else
	d = p[5] - 1;
	d = -719163L + d*365 + (d/4) - (d/100) + (d/400);
	secs = p[0]
		+ _time_tzinfo[timeptr->tm_isdst > 0].gmt_offset
		+ 60*( p[1]
			   + 60*(p[2]
					 + 24*(((146073L * ((long long)(p[6])) + d)
							+ p[3]) + p[7])));
	if (((unsigned long long)(secs - LONG_MIN))
		> (((unsigned long long)LONG_MAX) - LONG_MIN)
		) {
		return -1;
	}
#endif

	t = secs;

	localtime_r(&t, (struct tm *)p);

	if (store_on_success) {
		memcpy(timeptr, p, sizeof(struct tm));
	}

	return t;
}

#endif
/**********************************************************************/