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yap-6.3/os/pl-tai.c

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/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@cs.vu.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2012, University of Amsterdam
VU University Amsterdam
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define __MINGW_USE_VC2005_COMPAT /* Get Windows time_t as 64-bit */
#include "pl-incl.h"
#include <math.h>
#include "libtai/taia.h"
#include "libtai/caltime.h"
#include <stdio.h>
#include <ctype.h>
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#if defined(__WINDOWS__) || defined (__CYGWIN__)
#define timezone _timezone
#ifndef HAVE_VAR_TIMEZONE
#define HAVE_VAR_TIMEZONE
#endif
#else
extern char *tzname[2];
#ifdef HAVE_VAR_TIMEZONE
extern long timezone;
#endif
#endif
#define TAI_UTC_OFFSET LL(4611686018427387914)
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct ftm is a `floating' version of the system struct tm.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#define HAS_STAMP 0x0001
#define HAS_WYDAY 0x0002
#define NO_UTC_OFFSET 0x7fffffff
typedef struct ftm
{ struct tm tm; /* System time structure */
double sec; /* float version of tm.tm_sec */
int utcoff; /* offset to UTC (seconds) */
atom_t tzname; /* Name of timezone */
int isdst; /* Daylight saving time */
double stamp; /* Time stamp (sec since 1970-1-1) */
int flags; /* Filled fields */
} ftm;
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
tz_offset() returns the offset from UTC in seconds.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static void
do_tzset(void)
{ static int done = FALSE;
if ( !done )
{ tzset();
done = TRUE;
}
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
POSIX provides the variable timezone, providing the offset of the
current timezone WEST of GMT in seconds. Some systems (FreeBSD) do not
provide that. Instead thet provide tm_gmtoff in struct tm, but this
value is EAST and includes the DST offset.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static int
tz_offset(void)
{
#ifdef HAVE_VAR_TIMEZONE
do_tzset();
return timezone;
#else
#ifdef HAVE_STRUCT_TIME_TM_GMTOFF
static int offset = -1;
if ( offset == -1 )
{ time_t t = time(NULL);
struct tm tm;
PL_localtime_r(&t, &tm);
offset = -tm.tm_gmtoff;
if ( tm.tm_isdst > 0 )
offset += 3600;
/*Use to verify on systems where we know both. In Western Europe the
offset must be -3600, both in winter and summer.*/
/*Sdprintf("timezone offset = %d (must be %d)\n", offset, timezone);*/
}
return offset;
#else
#error "Do not know how to get timezone info"
#endif
#endif
}
static char *
tz_name(int dst)
{ dst = (dst != 0);
do_tzset();
return tzname[dst];
}
static atom_t
tz_name_as_atom(int dst)
{ static atom_t a[2];
dst = (dst > 0); /* 0 or 1 */
if ( !a[dst] )
{ wchar_t wbuf[256];
const char *str = tz_name(dst);
size_t n;
if ( (n = mbstowcs(wbuf, str, sizeof(wbuf)/sizeof(wbuf[0])-1)) != (size_t)-1 )
{ a[dst] = PL_new_atom_wchars(n, wbuf);
} else
{ a[dst] = PL_new_atom(str);
}
}
return a[dst];
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
unify_taia(): Unify a TAIA date as a Prolog double using the POSIX 1970
origin;
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
/*
static int
unify_taia(term_t t, struct taia *taia)
{ double d = (double)((int64_t)taia->sec.x - TAI_UTC_OFFSET);
d += taia->nano / 1e9;
return PL_unify_float(t, d);
}
*/
static int
get_taia(term_t t, struct taia *taia, double *seconds)
{ double d;
if ( PL_get_float(t, &d) )
{ double fp, ip;
if ( seconds )
*seconds = d;
fp = modf(d, &ip);
if ( fp < 0 )
{ fp += 1.0;
ip -= 1.0;
}
taia->sec.x = (int64_t)ip + TAI_UTC_OFFSET;
taia->nano = (long)(fp*1e9);
taia->atto = 0L;
return TRUE;
}
return FALSE;
}
static int
get_tz_arg(int i, term_t t, term_t a, atom_t *tz)
{ GET_LD
atom_t name;
_PL_get_arg(i, t, a);
if ( !PL_is_variable(a) )
{ if ( !PL_get_atom_ex(a, &name) )
fail;
if ( name != ATOM_minus )
*tz = name;
}
succeed;
}
static int
get_int_arg(int i, term_t t, term_t a, int *val)
{ GET_LD
_PL_get_arg(i, t, a);
return PL_get_integer_ex(a, val);
}
static int
get_voff_arg(int i, term_t t, term_t a, int *val)
{ GET_LD
_PL_get_arg(i, t, a);
if ( PL_is_variable(a) )
{ *val = NO_UTC_OFFSET;
return TRUE;
} else
{ return PL_get_integer_ex(a, val);
}
}
static int
get_float_arg(int i, term_t t, term_t a, double *val)
{ GET_LD
_PL_get_arg(i, t, a);
return PL_get_float_ex(a, val);
}
static int
get_dst_arg(int i, term_t t, term_t a, int *val)
{ GET_LD
atom_t name;
_PL_get_arg(i, t, a);
if ( PL_get_atom(a, &name) )
{ if ( name == ATOM_true )
{ *val = TRUE;
return TRUE;
} else if ( name == ATOM_false )
{ *val = FALSE;
return TRUE;
} else if ( name == ATOM_minus )
{ *val = -1;
return TRUE;
}
} else if ( PL_is_variable(a) )
{ *val = -2;
return TRUE;
}
return PL_get_bool_ex(a, val); /* generate an error */
}
static int
get_ftm(term_t t, ftm *ftm)
{ GET_LD
term_t tmp = PL_new_term_ref();
int date9;
memset(ftm, 0, sizeof(*ftm));
if ( (date9=PL_is_functor(t, FUNCTOR_date9)) )
{ if ( get_int_arg (1, t, tmp, &ftm->tm.tm_year) &&
get_int_arg (2, t, tmp, &ftm->tm.tm_mon) &&
get_int_arg (3, t, tmp, &ftm->tm.tm_mday) &&
get_int_arg (4, t, tmp, &ftm->tm.tm_hour) &&
get_int_arg (5, t, tmp, &ftm->tm.tm_min) &&
get_float_arg(6, t, tmp, &ftm->sec) &&
get_voff_arg (7, t, tmp, &ftm->utcoff) &&
get_tz_arg (8, t, tmp, &ftm->tzname) &&
get_dst_arg (9, t, tmp, &ftm->isdst) )
{ double fp, ip;
ftm->tm.tm_isdst = (ftm->isdst == -2 ? -1 : ftm->isdst);
fixup:
fp = modf(ftm->sec, &ip);
if ( fp < 0.0 )
{ fp += 1.0;
ip -= 1.0;
}
ftm->tm.tm_sec = (int)ip;
ftm->tm.tm_year -= 1900; /* 1900 based */
ftm->tm.tm_mon--; /* 0-based */
if ( ftm->utcoff == NO_UTC_OFFSET )
{ if ( ftm->tm.tm_isdst < 0 ) /* unknown DST */
{ int offset;
if ( mktime(&ftm->tm) == (time_t)-1 )
return PL_representation_error("dst");
ftm->flags |= HAS_WYDAY;
offset = tz_offset();
if ( ftm->tm.tm_isdst > 0 )
offset -= 3600;
ftm->utcoff = offset;
if ( date9 ) /* variable */
{ _PL_get_arg(7, t, tmp);
if ( !PL_unify_integer(tmp, ftm->utcoff) )
return FALSE;
} else
{ ftm->utcoff = offset;
}
}
if ( ftm->isdst == -2 )
{ ftm->isdst = ftm->tm.tm_isdst;
_PL_get_arg(9, t, tmp);
if ( ftm->isdst < 0 )
{ if ( !PL_unify_atom(tmp, ATOM_minus) )
return FALSE;
} else
{ if ( !PL_unify_bool(tmp, ftm->isdst) )
return FALSE;
}
}
if ( !ftm->tzname )
{ ftm->tzname = tz_name_as_atom(ftm->isdst);
_PL_get_arg(8, t, tmp);
if ( PL_is_variable(tmp) &&
!PL_unify_atom(tmp, ftm->tzname) )
return FALSE;
}
}
succeed;
}
} else if ( PL_is_functor(t, FUNCTOR_date3) )
{ if ( get_int_arg (1, t, tmp, &ftm->tm.tm_year) &&
get_int_arg (2, t, tmp, &ftm->tm.tm_mon) &&
get_int_arg (3, t, tmp, &ftm->tm.tm_mday) )
{ ftm->tm.tm_isdst = -1;
ftm->utcoff = NO_UTC_OFFSET;
goto fixup;
}
}
return PL_error(NULL, 0, NULL, ERR_TYPE, ATOM_time, t);
}
/** void cal_ftm(ftm *ftm, int required)
compute missing fields from fmt
*/
static void
cal_ftm(ftm *ftm, int required)
{ int missing = ftm->flags^required;
if ( missing ) /* we need something, so we always */
{ struct caltime ct; /* need the stamp */
struct tai tai;
ct.date.year = ftm->tm.tm_year+1900;
ct.date.month = ftm->tm.tm_mon+1;
ct.date.day = ftm->tm.tm_mday;
ct.hour = ftm->tm.tm_hour;
ct.minute = ftm->tm.tm_min;
ct.second = ftm->tm.tm_sec;
ct.offset = -ftm->utcoff / 60; /* TBD: make libtai speak seconds */
caltime_tai(&ct, &tai);
ftm->stamp = (double)((int64_t)tai.x - TAI_UTC_OFFSET);
ftm->stamp -= (double)ct.second;
ftm->stamp += ftm->sec;
ftm->flags |= HAS_STAMP;
if ( missing & HAS_WYDAY )
{ caltime_utc(&ct, &tai, &ftm->tm.tm_wday, &ftm->tm.tm_yday);
ftm->flags |= HAS_WYDAY;
}
}
}
static
PRED_IMPL("stamp_date_time", 3, stamp_date_time, 0)
{ PRED_LD
struct taia taia;
term_t compound = A2;
double argsec;
if ( get_taia(A1, &taia, &argsec) )
{ struct caltime ct;
int weekday, yearday;
double sec;
int utcoffset;
int done = FALSE;
atom_t alocal;
atom_t tzatom = ATOM_minus;
atom_t dstatom = ATOM_minus;
if ( PL_get_atom(A3, &alocal) )
{ if ( alocal == ATOM_local )
{ time_t unixt;
int64_t ut64;
struct tm tm;
utcoffset = tz_offset();
ut64 = taia.sec.x - TAI_UTC_OFFSET;
unixt = (time_t) ut64;
if ( (int64_t)unixt == ut64 )
{ double ip;
PL_localtime_r(&unixt, &tm);
sec = (double)tm.tm_sec + modf(argsec, &ip);
ct.date.year = tm.tm_year+1900;
ct.date.month = tm.tm_mon+1;
ct.date.day = tm.tm_mday;
ct.hour = tm.tm_hour;
ct.minute = tm.tm_min;
tzatom = tz_name_as_atom(tm.tm_isdst);
if ( tm.tm_isdst > 0 )
{ utcoffset -= 3600;
dstatom = ATOM_true;
} else
{ dstatom = ATOM_false;
}
done = TRUE;
}
} else if ( alocal == ATOM_utc )
{ utcoffset = 0;
tzatom = alocal;
} else
{ return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_timezone, A3);
}
} else if ( !PL_get_integer_ex(A3, &utcoffset) )
{ fail;
}
if ( !done )
{ taia.sec.x -= utcoffset;
caltime_utc(&ct, &taia.sec, &weekday, &yearday);
sec = (double)ct.second+(double)taia.nano/1e9;
}
return PL_unify_term(compound,
PL_FUNCTOR, FUNCTOR_date9,
PL_LONG, ct.date.year,
PL_INT, ct.date.month,
PL_INT, ct.date.day,
PL_INT, ct.hour,
PL_INT, ct.minute,
PL_FLOAT, sec,
PL_INT, utcoffset,
PL_ATOM, tzatom,
PL_ATOM, dstatom);
}
/* time_stamp */
return PL_error(NULL, 0, NULL, ERR_TYPE, ATOM_float, A1);
}
static
PRED_IMPL("date_time_stamp", 2, date_time_stamp, 0)
{ ftm ftm;
if ( !get_ftm(A1, &ftm) )
fail;
cal_ftm(&ftm, HAS_STAMP);
return PL_unify_float(A2, ftm.stamp);
}
/*******************************
* GLIBC FUNCTIONS *
*******************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
These functions support strftime() %g, %G and %V. Code is copied from
glibc 2.3.5. As Glibc is LGPL, there are no license issues.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifndef __isleap
/* Nonzero if YEAR is a leap year (every 4 years,
except every 100th isn't, and every 400th is). */
# define __isleap(year) \
((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
#endif
/* The number of days from the first day of the first ISO week of this
year to the year day YDAY with week day WDAY. ISO weeks start on
Monday; the first ISO week has the year's first Thursday. YDAY may
be as small as YDAY_MINIMUM. */
#define ISO_WEEK_START_WDAY 1 /* Monday */
#define ISO_WEEK1_WDAY 4 /* Thursday */
#define YDAY_MINIMUM (-366)
#ifdef __GNUC__
__inline__
#endif
static int
iso_week_days(int yday, int wday)
{ /* Add enough to the first operand of % to make it nonnegative. */
int big_enough_multiple_of_7 = (-YDAY_MINIMUM / 7 + 2) * 7;
return (yday
- (yday - wday + ISO_WEEK1_WDAY + big_enough_multiple_of_7) % 7
+ ISO_WEEK1_WDAY - ISO_WEEK_START_WDAY);
}
/*******************************
* ERRORS *
*******************************/
static int
fmt_domain_error(const char *key, int value)
{ GET_LD
term_t t = PL_new_term_ref();
PL_put_integer(t, value);
return PL_error(NULL, 0, NULL, ERR_DOMAIN, PL_new_atom(key), t);
}
static int
fmt_not_implemented(int c)
{ GET_LD
term_t t = PL_new_term_ref();
char key[3];
key[0] = '%';
key[1] = c;
key[2] = 0;
PL_put_atom_chars(t, key);
return PL_error(NULL, 0, NULL, ERR_EXISTENCE, PL_new_atom("format"), t);
}
/*******************************
* FORMATTING *
*******************************/
#define OUT1DIGIT(fd, val) \
{ Sputcode('0'+(val)%10, fd); \
}
#define OUT2DIGITS(fd, val) \
{ Sputcode('0'+((val)/10)%10, fd); \
Sputcode('0'+(val)%10, fd); \
}
#define OUT3DIGITS(fd, val) \
{ Sputcode('0'+((val)/100)%10, fd); \
Sputcode('0'+((val)/10)%10, fd); \
Sputcode('0'+(val)%10, fd); \
}
#define OUT2DIGITS_SPC(fd, val) \
{ Sputcode(((val)/10 == 0 ? ' ' : '0'+((val)/10)%10), fd); \
Sputcode('0'+(val)%10, fd); \
}
#define OUTNUMBER(fd, fmt, val) \
{ Sfprintf(fd, fmt, val); \
}
#define SUBFORMAT(f) \
{ format_time(fd, f, ftm, posix); \
}
#define OUTCHR(fd, c) \
{ Sputcode(c, fd); \
}
#define OUTSTR(str) \
{ Sfputs(str, fd); \
}
#define OUTSTRA(str) \
{ foutstra(str, fd); \
}
#define OUTATOM(a) \
{ writeAtomToStream(fd, a); \
}
static void
foutstra(const char *str, IOSTREAM *fd)
{ wchar_t wbuf[256];
size_t n;
if ( (n = mbstowcs(wbuf, str, sizeof(wbuf)/sizeof(wbuf[0])-1)) != (size_t)-1 )
{ wchar_t *p;
for(p=wbuf; n-- > 0; p++)
Sputcode(*p, fd);
}
}
static const char *abbred_weekday[] =
{ "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
static const char *weekday[] =
{ "Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday" };
static const char *abbred_month[] =
{ "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
static const char *month[] =
{ "January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December"
};
#define NOARG (-1)
static int
format_time(IOSTREAM *fd, const wchar_t *format, ftm *ftm, int posix)
{ wint_t c;
while((c = *format++))
{ int arg = NOARG;
int altO = FALSE;
switch(c)
{ case '%':
arg = NOARG;
fmt_next:
switch((c = *format++))
{ case 'a': /* %a: abbreviated weekday */
case 'A': /* %A: weekday */
case 'b': /* %b: abbreviated month */
case 'B': /* %B: month */
if ( posix )
{ const char *s;
cal_ftm(ftm, HAS_STAMP|HAS_WYDAY);
switch( c )
{ case 'a':
s = abbred_weekday[ftm->tm.tm_wday];
break;
case 'A':
s = weekday[ftm->tm.tm_wday];
break;
case 'b':
s = abbred_month[ftm->tm.tm_mon];
break;
case 'B':
s = month[ftm->tm.tm_mon];
break;
default:
s = NULL;
assert(0);
}
OUTSTR(s);
break;
}
/*FALLTHROUGH*/
case 'c': /* %c: default representation */
case 'p': /* %p: AM/PM (locale) */
case 'P': /* %P: am/pm (locale) */
case 'x': /* %x: date in locale */
case 'X': /* %X: time in locale */
case_b:
{ char fmt[3];
char buf[256];
fmt[0] = '%';
fmt[1] = (char)c;
fmt[2] = EOS;
cal_ftm(ftm, HAS_STAMP|HAS_WYDAY);
/* conversion is not thread-safe under locale switch */
strftime(buf, sizeof(buf), fmt, &ftm->tm);
OUTSTRA(buf);
break;
}
case 'C': /* (year/100) as a 2-digit int */
{ int year = ftm->tm.tm_year+1900;
if ( year >= 0 && year < 10000 )
{ int century = year/100;
OUT2DIGITS(fd, century);
} else
{ return fmt_domain_error("%C", year);
}
break;
}
case 'd': /* day of the month */
OUT2DIGITS(fd, ftm->tm.tm_mday);
break;
case 'D': /* %m/%d/%y */
SUBFORMAT(L"%m/%d/%y");
break;
case 'e': /* day of the month */
OUT2DIGITS_SPC(fd, ftm->tm.tm_mday);
break;
case 'E': /* alternative format */
return fmt_not_implemented(c);
case 'F': /* ISO 8601 date format */
SUBFORMAT(L"%Y-%m-%d");
break;
case 'G':
case 'g':
case 'V':
{ int year, days;
cal_ftm(ftm, HAS_STAMP|HAS_WYDAY);
year = ftm->tm.tm_year+1900;
days = iso_week_days(ftm->tm.tm_yday, ftm->tm.tm_wday);
if ( days < 0 )
{ year--;
days = iso_week_days(ftm->tm.tm_yday + (365 + __isleap (year)),
ftm->tm.tm_wday);
} else
{ int d = iso_week_days(ftm->tm.tm_yday - (365 + __isleap (year)),
ftm->tm.tm_wday);
if (0 <= d)
{ /* This ISO week belongs to the next year. */
year++;
days = d;
}
}
switch(c)
{ case 'g':
OUT2DIGITS(fd, (year % 100 + 100) % 100);
break;
case 'G':
OUTNUMBER(fd, "%d", year);
break;
case 'V':
OUT2DIGITS(fd, days/7+1);
break;
}
break;
}
case 'h': /* Equivalent to %b. (SU) */
c = 'b';
goto case_b;
case 'H': /* 0..23 hours */
OUT2DIGITS(fd, ftm->tm.tm_hour);
break;
case 'I': /* 01..12 hours */
OUT2DIGITS(fd, (ftm->tm.tm_hour)%12);
break;
case 'j': /* yday (001..366) */
cal_ftm(ftm, HAS_WYDAY);
OUT3DIGITS(fd, ftm->tm.tm_yday+1);
break;
case 'k': /* 0..23 hours (leading space) */
OUT2DIGITS_SPC(fd, ftm->tm.tm_hour);
break;
case 'l': /* 1..12 hours (leading space) */
OUT2DIGITS_SPC(fd, (ftm->tm.tm_hour)%12);
break;
case 'm': /* 01..12 month */
OUT2DIGITS(fd, ftm->tm.tm_mon+1);
break;
case 'M': /* 00..59 minute */
OUT2DIGITS(fd, ftm->tm.tm_min);
break;
case 'n': /* newline */
OUTCHR(fd, '\n');
break;
case 'O':
case ':':
if ( format[0] == 'z' )
{ altO = TRUE;
goto fmt_next;
}
return fmt_not_implemented(c);
case 'r': /* The time in a.m./p.m. notation */
SUBFORMAT(L"%I:%M:%S %p"); /* TBD: :-separator locale handling */
break;
case 'R':
SUBFORMAT(L"%H:%M");
break;
case 'f': /* Microseconds */
{ int digits = (arg == NOARG ? 6 : arg);
if ( digits > 0 )
{ double ip;
char fmt[64];
cal_ftm(ftm, HAS_STAMP);
Ssprintf(fmt, "%%0%dlld", digits);
OUTNUMBER(fd, fmt, (long)(modf(ftm->stamp, &ip) *
pow(10, digits)));
}
break;
}
case 's': /* Seconds since 1970 */
cal_ftm(ftm, HAS_STAMP);
OUTNUMBER(fd, "%.0f", ftm->stamp);
break;
case 'S': /* Seconds */
OUT2DIGITS(fd, ftm->tm.tm_sec);
break;
case 't': /* tab */
OUTCHR(fd, '\t');
break;
case 'T':
SUBFORMAT(L"%H:%M:%S");
break;
case 'u': /* 1..7 weekday, mon=1 */
{ int wday;
cal_ftm(ftm, HAS_WYDAY);
wday = (ftm->tm.tm_wday - 1 + 7) % 7 + 1;
OUT1DIGIT(fd, wday);
break;
}
case 'U': /* 00..53 weeknumber */
{ int wk;
cal_ftm(ftm, HAS_WYDAY);
wk = (ftm->tm.tm_yday - (ftm->tm.tm_yday - ftm->tm.tm_wday + 7) % 7 + 7) / 7;
OUT2DIGITS(fd, wk);
break;
}
case 'w': /* 0..6 weekday */
cal_ftm(ftm, HAS_WYDAY);
OUT1DIGIT(fd, ftm->tm.tm_wday);
break;
case 'W': /* 00..53 monday-based week number */
{ int wk;
cal_ftm(ftm, HAS_WYDAY);
wk = (ftm->tm.tm_yday - (ftm->tm.tm_yday - ftm->tm.tm_wday + 8) % 7 + 7) / 7;
OUT2DIGITS(fd, wk);
break;
}
case 'y': /* 00..99 (year) */
OUT2DIGITS(fd, (ftm->tm.tm_year+1900) % 100);
break;
case 'Y': /* Year (decimal) */
OUTNUMBER(fd, "%d", ftm->tm.tm_year+1900);
break;
case 'z': /* Time-zone as offset */
{ int min = -ftm->utcoff/60;
if ( min >= 0 )
{ OUTCHR(fd, '+');
} else
{ min = -min;
OUTCHR(fd, '-');
}
OUT2DIGITS(fd, min/60);
if ( altO )
OUTCHR(fd, ':');
OUT2DIGITS(fd, min%60);
break;
}
case 'Z': /* Time-zone as name */
if ( ftm->tzname )
{ OUTATOM(ftm->tzname);
} else
{ OUTSTRA(tz_name(ftm->tm.tm_isdst));
}
break;
case '+':
{ char buf[26];
cal_ftm(ftm, HAS_WYDAY);
PL_asctime_r(&ftm->tm, buf);
buf[24] = EOS;
OUTSTRA(buf);
}
break;
case '%':
OUTCHR(fd, '%');
break;
default:
if ( isdigit(c) )
{ if ( arg == NOARG )
arg = c - '0';
else
arg = arg*10+(c-'0');
goto fmt_next;
} else
{ return fmt_not_implemented(c);
}
}
break;
default:
OUTCHR(fd, c);
}
}
return TRUE;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
format_time(+Spec, +Format, +Stamp)
Issues:
* Localtime/DST
* Year is an int (not so bad)
* Portability
* Sub-second times
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static foreign_t
pl_format_time(term_t out, term_t format, term_t time, int posix)
{ struct taia taia;
struct caltime ct;
struct ftm tb;
int weekday, yearday;
wchar_t *fmt;
time_t unixt;
int64_t ut64;
size_t fmtlen;
redir_context ctx;
if ( !PL_get_wchars(format, &fmtlen, &fmt,
CVT_ATOM|CVT_STRING|CVT_LIST|CVT_EXCEPTION) )
fail;
memset(&tb, 0, sizeof(tb));
if ( get_taia(time, &taia, &tb.stamp) )
{ double ip;
ut64 = taia.sec.x - TAI_UTC_OFFSET;
unixt = (time_t) ut64;
if ( (int64_t)unixt == ut64 )
{ tb.utcoff = tz_offset();
PL_localtime_r(&unixt, &tb.tm);
tb.sec = (double)tb.tm.tm_sec + modf(tb.stamp, &ip);
if ( tb.tm.tm_isdst > 0 )
{ tb.utcoff -= 3600;
tb.isdst = TRUE;
}
tb.tzname = tz_name_as_atom(tb.tm.tm_isdst);
tb.flags = HAS_STAMP|HAS_WYDAY;
} else
{ caltime_utc(&ct, &taia.sec, &weekday, &yearday);
tb.tm.tm_sec = ct.second;
tb.tm.tm_min = ct.minute;
tb.tm.tm_hour = ct.hour;
tb.tm.tm_mday = ct.date.day;
tb.tm.tm_mon = ct.date.month - 1;
tb.tm.tm_year = ct.date.year - 1900;
tb.tm.tm_wday = weekday;
tb.tm.tm_yday = yearday;
tb.tzname = ATOM_utc;
tb.utcoff = 0;
}
} else if ( !get_ftm(time, &tb) )
{ return FALSE;
}
if ( !setupOutputRedirect(out, &ctx, FALSE) )
fail;
if ( format_time(ctx.stream, fmt, &tb, posix) )
return closeOutputRedirect(&ctx); /* takes care of I/O errors */
discardOutputRedirect(&ctx);
fail;
}
static
PRED_IMPL("format_time", 3, format_time3, 0)
{ return pl_format_time(A1, A2, A3, FALSE);
}
static
PRED_IMPL("format_time", 4, format_time4, 0)
{ PRED_LD
int posix = FALSE;
atom_t locale;
if ( !PL_get_atom_ex(A4, &locale) )
return FALSE;
if ( locale == ATOM_posix )
posix = TRUE;
else
return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_locale, A4);
return pl_format_time(A1, A2, A3, posix);
}
/*******************************
* PUBLISH PREDICATES *
*******************************/
BeginPredDefs(tai)
PRED_DEF("stamp_date_time", 3, stamp_date_time, 0)
PRED_DEF("date_time_stamp", 2, date_time_stamp, 0)
PRED_DEF("format_time", 3, format_time3, 0)
PRED_DEF("format_time", 4, format_time4, 0)
EndPredDefs
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