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/*
* tclClock.c --
*
* Contains the time and date related commands. This code is derived from
* the time and date facilities of TclX, by Mark Diekhans and Karl
* Lehenbauer.
*
* Copyright (c) 1991-1995 Karl Lehenbauer & Mark Diekhans.
* Copyright (c) 1995 Sun Microsystems, Inc.
* Copyright (c) 2004 by Kevin B. Kenny. All rights reserved.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tclInt.h"
/*
* Windows has mktime. The configurators do not check.
*/
#ifdef _WIN32
#define HAVE_MKTIME 1
#endif
/*
* Constants
*/
#define JULIAN_DAY_POSIX_EPOCH 2440588
#define SECONDS_PER_DAY 86400
#define JULIAN_SEC_POSIX_EPOCH (((Tcl_WideInt) JULIAN_DAY_POSIX_EPOCH) \
* SECONDS_PER_DAY)
#define FOUR_CENTURIES 146097 /* days */
#define JDAY_1_JAN_1_CE_JULIAN 1721424
#define JDAY_1_JAN_1_CE_GREGORIAN 1721426
#define ONE_CENTURY_GREGORIAN 36524 /* days */
#define FOUR_YEARS 1461 /* days */
#define ONE_YEAR 365 /* days */
/*
* Table of the days in each month, leap and common years
*/
static const int hath[2][12] = {
{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
};
static const int daysInPriorMonths[2][13] = {
{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
{0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366}
};
/*
* Enumeration of the string literals used in [clock]
*/
typedef enum ClockLiteral {
LIT__NIL,
LIT__DEFAULT_FORMAT,
LIT_BCE, LIT_C,
LIT_CANNOT_USE_GMT_AND_TIMEZONE,
LIT_CE,
LIT_DAYOFMONTH, LIT_DAYOFWEEK, LIT_DAYOFYEAR,
LIT_ERA, LIT_GMT, LIT_GREGORIAN,
LIT_INTEGER_VALUE_TOO_LARGE,
LIT_ISO8601WEEK, LIT_ISO8601YEAR,
LIT_JULIANDAY, LIT_LOCALSECONDS,
LIT_MONTH,
LIT_SECONDS, LIT_TZNAME, LIT_TZOFFSET,
LIT_YEAR,
LIT__END
} ClockLiteral;
static const char *const literals[] = {
"",
"%a %b %d %H:%M:%S %Z %Y",
"BCE", "C",
"cannot use -gmt and -timezone in same call",
"CE",
"dayOfMonth", "dayOfWeek", "dayOfYear",
"era", ":GMT", "gregorian",
"integer value too large to represent",
"iso8601Week", "iso8601Year",
"julianDay", "localSeconds",
"month",
"seconds", "tzName", "tzOffset",
"year"
};
/*
* Structure containing the client data for [clock]
*/
typedef struct {
size_t refCount; /* Number of live references. */
Tcl_Obj **literals; /* Pool of object literals. */
} ClockClientData;
/*
* Structure containing the fields used in [clock format] and [clock scan]
*/
typedef struct TclDateFields {
Tcl_WideInt seconds; /* Time expressed in seconds from the Posix
* epoch */
Tcl_WideInt localSeconds; /* Local time expressed in nominal seconds
* from the Posix epoch */
int tzOffset; /* Time zone offset in seconds east of
* Greenwich */
Tcl_Obj *tzName; /* Time zone name */
int julianDay; /* Julian Day Number in local time zone */
enum {BCE=1, CE=0} era; /* Era */
int gregorian; /* Flag == 1 if the date is Gregorian */
int year; /* Year of the era */
int dayOfYear; /* Day of the year (1 January == 1) */
int month; /* Month number */
int dayOfMonth; /* Day of the month */
int iso8601Year; /* ISO8601 week-based year */
int iso8601Week; /* ISO8601 week number */
int dayOfWeek; /* Day of the week */
} TclDateFields;
static const char *const eras[] = { "CE", "BCE", NULL };
/*
* Thread specific data block holding a 'struct tm' for the 'gmtime' and
* 'localtime' library calls.
*/
static Tcl_ThreadDataKey tmKey;
/*
* Mutex protecting 'gmtime', 'localtime' and 'mktime' calls and the statics
* in the date parsing code.
*/
TCL_DECLARE_MUTEX(clockMutex)
/*
* Function prototypes for local procedures in this file:
*/
static int ConvertUTCToLocal(Tcl_Interp *,
TclDateFields *, Tcl_Obj *, int);
static int ConvertUTCToLocalUsingTable(Tcl_Interp *,
TclDateFields *, int, Tcl_Obj *const[]);
static int ConvertUTCToLocalUsingC(Tcl_Interp *,
TclDateFields *, int);
static int ConvertLocalToUTC(Tcl_Interp *,
TclDateFields *, Tcl_Obj *, int);
static int ConvertLocalToUTCUsingTable(Tcl_Interp *,
TclDateFields *, int, Tcl_Obj *const[]);
static int ConvertLocalToUTCUsingC(Tcl_Interp *,
TclDateFields *, int);
static Tcl_Obj * LookupLastTransition(Tcl_Interp *, Tcl_WideInt,
int, Tcl_Obj *const *);
static void GetYearWeekDay(TclDateFields *, int);
static void GetGregorianEraYearDay(TclDateFields *, int);
static void GetMonthDay(TclDateFields *);
static void GetJulianDayFromEraYearWeekDay(TclDateFields *, int);
static void GetJulianDayFromEraYearMonthDay(TclDateFields *, int);
static int IsGregorianLeapYear(TclDateFields *);
static int WeekdayOnOrBefore(int, int);
static int ClockClicksObjCmd(
ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int ClockConvertlocaltoutcObjCmd(
ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int ClockGetdatefieldsObjCmd(
ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int ClockGetjuliandayfromerayearmonthdayObjCmd(
ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int ClockGetjuliandayfromerayearweekdayObjCmd(
ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int ClockGetenvObjCmd(
ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int ClockMicrosecondsObjCmd(
ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int ClockMillisecondsObjCmd(
ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int ClockParseformatargsObjCmd(
ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static int ClockSecondsObjCmd(
ClientData clientData, Tcl_Interp *interp,
int objc, Tcl_Obj *const objv[]);
static struct tm * ThreadSafeLocalTime(const time_t *);
static void TzsetIfNecessary(void);
static void ClockDeleteCmdProc(ClientData);
/*
* Structure containing description of "native" clock commands to create.
*/
struct ClockCommand {
const char *name; /* The tail of the command name. The full name
* is "::tcl::clock::<name>". When NULL marks
* the end of the table. */
Tcl_ObjCmdProc *objCmdProc; /* Function that implements the command. This
* will always have the ClockClientData sent
* to it, but may well ignore this data. */
};
static const struct ClockCommand clockCommands[] = {
{ "getenv", ClockGetenvObjCmd },
{ "Oldscan", TclClockOldscanObjCmd },
{ "ConvertLocalToUTC", ClockConvertlocaltoutcObjCmd },
{ "GetDateFields", ClockGetdatefieldsObjCmd },
{ "GetJulianDayFromEraYearMonthDay",
ClockGetjuliandayfromerayearmonthdayObjCmd },
{ "GetJulianDayFromEraYearWeekDay",
ClockGetjuliandayfromerayearweekdayObjCmd },
{ "ParseFormatArgs", ClockParseformatargsObjCmd },
{ NULL, NULL }
};
/*
*----------------------------------------------------------------------
*
* TclClockInit --
*
* Registers the 'clock' subcommands with the Tcl interpreter and
* initializes its client data (which consists mostly of constant
* Tcl_Obj's that it is too much trouble to keep recreating).
*
* Results:
* None.
*
* Side effects:
* Installs the commands and creates the client data
*
*----------------------------------------------------------------------
*/
void
TclClockInit(
Tcl_Interp *interp) /* Tcl interpreter */
{
const struct ClockCommand *clockCmdPtr;
char cmdName[50]; /* Buffer large enough to hold the string
*::tcl::clock::GetJulianDayFromEraYearMonthDay
* plus a terminating NUL. */
ClockClientData *data;
int i;
/* Structure of the 'clock' ensemble */
static const EnsembleImplMap clockImplMap[] = {
{"add", NULL, TclCompileBasicMin1ArgCmd, NULL, NULL, 0},
{"clicks", ClockClicksObjCmd, TclCompileClockClicksCmd, NULL, NULL, 0},
{"format", NULL, TclCompileBasicMin1ArgCmd, NULL, NULL, 0},
{"microseconds", ClockMicrosecondsObjCmd, TclCompileClockReadingCmd, NULL, INT2PTR(1), 0},
{"milliseconds", ClockMillisecondsObjCmd, TclCompileClockReadingCmd, NULL, INT2PTR(2), 0},
{"scan", NULL, TclCompileBasicMin1ArgCmd, NULL, NULL , 0},
{"seconds", ClockSecondsObjCmd, TclCompileClockReadingCmd, NULL, INT2PTR(3), 0},
{NULL, NULL, NULL, NULL, NULL, 0}
};
/*
* Safe interps get [::clock] as alias to a parent, so do not need their
* own copies of the support routines.
*/
if (Tcl_IsSafe(interp)) {
return;
}
/*
* Create the client data, which is a refcounted literal pool.
*/
data = (ClockClientData *)ckalloc(sizeof(ClockClientData));
data->refCount = 0;
data->literals = (Tcl_Obj **)ckalloc(LIT__END * sizeof(Tcl_Obj*));
for (i = 0; i < LIT__END; ++i) {
data->literals[i] = Tcl_NewStringObj(literals[i], -1);
Tcl_IncrRefCount(data->literals[i]);
}
/*
* Install the commands.
* TODO - Let Tcl_MakeEnsemble do this?
*/
#define TCL_CLOCK_PREFIX_LEN 14 /* == strlen("::tcl::clock::") */
memcpy(cmdName, "::tcl::clock::", TCL_CLOCK_PREFIX_LEN);
for (clockCmdPtr=clockCommands ; clockCmdPtr->name!=NULL ; clockCmdPtr++) {
strcpy(cmdName + TCL_CLOCK_PREFIX_LEN, clockCmdPtr->name);
data->refCount++;
Tcl_CreateObjCommand(interp, cmdName, clockCmdPtr->objCmdProc, data,
ClockDeleteCmdProc);
}
/* Make the clock ensemble */
TclMakeEnsemble(interp, "clock", clockImplMap);
}
/*
*----------------------------------------------------------------------
*
* ClockConvertlocaltoutcObjCmd --
*
* Tcl command that converts a UTC time to a local time by whatever means
* is available.
*
* Usage:
* ::tcl::clock::ConvertUTCToLocal dictionary tzdata changeover
*
* Parameters:
* dict - Dictionary containing a 'localSeconds' entry.
* tzdata - Time zone data
* changeover - Julian Day of the adoption of the Gregorian calendar.
*
* Results:
* Returns a standard Tcl result.
*
* Side effects:
* On success, sets the interpreter result to the given dictionary
* augmented with a 'seconds' field giving the UTC time. On failure,
* leaves an error message in the interpreter result.
*
*----------------------------------------------------------------------
*/
static int
ClockConvertlocaltoutcObjCmd(
ClientData clientData, /* Client data */
Tcl_Interp *interp, /* Tcl interpreter */
int objc, /* Parameter count */
Tcl_Obj *const *objv) /* Parameter vector */
{
ClockClientData *data = (ClockClientData *)clientData;
Tcl_Obj *const *lit = data->literals;
Tcl_Obj *secondsObj;
Tcl_Obj *dict;
int changeover;
TclDateFields fields;
int created = 0;
int status;
/*
* Check params and convert time.
*/
if (objc != 4) {
Tcl_WrongNumArgs(interp, 1, objv, "dict tzdata changeover");
return TCL_ERROR;
}
dict = objv[1];
if (Tcl_DictObjGet(interp, dict, lit[LIT_LOCALSECONDS],
&secondsObj)!= TCL_OK) {
return TCL_ERROR;
}
if (secondsObj == NULL) {
Tcl_SetObjResult(interp, Tcl_NewStringObj("key \"localseconds\" not "
"found in dictionary", -1));
return TCL_ERROR;
}
if ((TclGetWideIntFromObj(interp, secondsObj,
&fields.localSeconds) != TCL_OK)
|| (TclGetIntFromObj(interp, objv[3], &changeover) != TCL_OK)
|| ConvertLocalToUTC(interp, &fields, objv[2], changeover)) {
return TCL_ERROR;
}
/*
* Copy-on-write; set the 'seconds' field in the dictionary and place the
* modified dictionary in the interpreter result.
*/
if (Tcl_IsShared(dict)) {
dict = Tcl_DuplicateObj(dict);
created = 1;
Tcl_IncrRefCount(dict);
}
status = Tcl_DictObjPut(interp, dict, lit[LIT_SECONDS],
Tcl_NewWideIntObj(fields.seconds));
if (status == TCL_OK) {
Tcl_SetObjResult(interp, dict);
}
if (created) {
Tcl_DecrRefCount(dict);
}
return status;
}
/*
*----------------------------------------------------------------------
*
* ClockGetdatefieldsObjCmd --
*
* Tcl command that determines the values that [clock format] will use in
* formatting a date, and populates a dictionary with them.
*
* Usage:
* ::tcl::clock::GetDateFields seconds tzdata changeover
*
* Parameters:
* seconds - Time expressed in seconds from the Posix epoch.
* tzdata - Time zone data of the time zone in which time is to be
* expressed.
* changeover - Julian Day Number at which the current locale adopted
* the Gregorian calendar
*
* Results:
* Returns a dictonary populated with the fields:
* seconds - Seconds from the Posix epoch
* localSeconds - Nominal seconds from the Posix epoch in the
* local time zone.
* tzOffset - Time zone offset in seconds east of Greenwich
* tzName - Time zone name
* julianDay - Julian Day Number in the local time zone
*
*----------------------------------------------------------------------
*/
int
ClockGetdatefieldsObjCmd(
ClientData clientData, /* Opaque pointer to literal pool, etc. */
Tcl_Interp *interp, /* Tcl interpreter */
int objc, /* Parameter count */
Tcl_Obj *const *objv) /* Parameter vector */
{
TclDateFields fields;
Tcl_Obj *dict;
ClockClientData *data = (ClockClientData *)clientData;
Tcl_Obj *const *lit = data->literals;
int changeover;
/*
* Check params.
*/
if (objc != 4) {
Tcl_WrongNumArgs(interp, 1, objv, "seconds tzdata changeover");
return TCL_ERROR;
}
if (TclGetWideIntFromObj(interp, objv[1], &fields.seconds) != TCL_OK
|| TclGetIntFromObj(interp, objv[3], &changeover) != TCL_OK) {
return TCL_ERROR;
}
/*
* fields.seconds could be an unsigned number that overflowed. Make sure
* that it isn't.
*/
if (objv[1]->typePtr == &tclBignumType) {
Tcl_SetObjResult(interp, lit[LIT_INTEGER_VALUE_TOO_LARGE]);
return TCL_ERROR;
}
/*
* Convert UTC time to local.
*/
if (ConvertUTCToLocal(interp, &fields, objv[2], changeover) != TCL_OK) {
return TCL_ERROR;
}
/*
* Extract Julian day.
*/
fields.julianDay = (int) ((fields.localSeconds + JULIAN_SEC_POSIX_EPOCH)
/ SECONDS_PER_DAY);
/*
* Convert to Julian or Gregorian calendar.
*/
GetGregorianEraYearDay(&fields, changeover);
GetMonthDay(&fields);
GetYearWeekDay(&fields, changeover);
dict = Tcl_NewDictObj();
Tcl_DictObjPut(NULL, dict, lit[LIT_LOCALSECONDS],
Tcl_NewWideIntObj(fields.localSeconds));
Tcl_DictObjPut(NULL, dict, lit[LIT_SECONDS],
Tcl_NewWideIntObj(fields.seconds));
Tcl_DictObjPut(NULL, dict, lit[LIT_TZNAME], fields.tzName);
Tcl_DecrRefCount(fields.tzName);
Tcl_DictObjPut(NULL, dict, lit[LIT_TZOFFSET],
Tcl_NewIntObj(fields.tzOffset));
Tcl_DictObjPut(NULL, dict, lit[LIT_JULIANDAY],
Tcl_NewIntObj(fields.julianDay));
Tcl_DictObjPut(NULL, dict, lit[LIT_GREGORIAN],
Tcl_NewIntObj(fields.gregorian));
Tcl_DictObjPut(NULL, dict, lit[LIT_ERA],
lit[fields.era ? LIT_BCE : LIT_CE]);
Tcl_DictObjPut(NULL, dict, lit[LIT_YEAR],
Tcl_NewIntObj(fields.year));
Tcl_DictObjPut(NULL, dict, lit[LIT_DAYOFYEAR],
Tcl_NewIntObj(fields.dayOfYear));
Tcl_DictObjPut(NULL, dict, lit[LIT_MONTH],
Tcl_NewIntObj(fields.month));
Tcl_DictObjPut(NULL, dict, lit[LIT_DAYOFMONTH],
Tcl_NewIntObj(fields.dayOfMonth));
Tcl_DictObjPut(NULL, dict, lit[LIT_ISO8601YEAR],
Tcl_NewIntObj(fields.iso8601Year));
Tcl_DictObjPut(NULL, dict, lit[LIT_ISO8601WEEK],
Tcl_NewIntObj(fields.iso8601Week));
Tcl_DictObjPut(NULL, dict, lit[LIT_DAYOFWEEK],
Tcl_NewIntObj(fields.dayOfWeek));
Tcl_SetObjResult(interp, dict);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ClockGetjuliandayfromerayearmonthdayObjCmd --
*
* Tcl command that converts a time from era-year-month-day to a Julian
* Day Number.
*
* Parameters:
* dict - Dictionary that contains 'era', 'year', 'month' and
* 'dayOfMonth' keys.
* changeover - Julian Day of changeover to the Gregorian calendar
*
* Results:
* Result is either TCL_OK, with the interpreter result being the
* dictionary augmented with a 'julianDay' key, or TCL_ERROR,
* with the result being an error message.
*
*----------------------------------------------------------------------
*/
static int
FetchEraField(
Tcl_Interp *interp,
Tcl_Obj *dict,
Tcl_Obj *key,
int *storePtr)
{
Tcl_Obj *value = NULL;
if (Tcl_DictObjGet(interp, dict, key, &value) != TCL_OK) {
return TCL_ERROR;
}
if (value == NULL) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"expected key(s) not found in dictionary", -1));
return TCL_ERROR;
}
return Tcl_GetIndexFromObj(interp, value, eras, "era", TCL_EXACT, storePtr);
}
static int
FetchIntField(
Tcl_Interp *interp,
Tcl_Obj *dict,
Tcl_Obj *key,
int *storePtr)
{
Tcl_Obj *value = NULL;
if (Tcl_DictObjGet(interp, dict, key, &value) != TCL_OK) {
return TCL_ERROR;
}
if (value == NULL) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"expected key(s) not found in dictionary", -1));
return TCL_ERROR;
}
return TclGetIntFromObj(interp, value, storePtr);
}
static int
ClockGetjuliandayfromerayearmonthdayObjCmd(
ClientData clientData, /* Opaque pointer to literal pool, etc. */
Tcl_Interp *interp, /* Tcl interpreter */
int objc, /* Parameter count */
Tcl_Obj *const *objv) /* Parameter vector */
{
TclDateFields fields;
Tcl_Obj *dict;
ClockClientData *data = (ClockClientData *)clientData;
Tcl_Obj *const *lit = data->literals;
int changeover;
int copied = 0;
int status;
int era = 0;
/*
* Check params.
*/
if (objc != 3) {
Tcl_WrongNumArgs(interp, 1, objv, "dict changeover");
return TCL_ERROR;
}
dict = objv[1];
if (FetchEraField(interp, dict, lit[LIT_ERA], &era) != TCL_OK
|| FetchIntField(interp, dict, lit[LIT_YEAR], &fields.year)
!= TCL_OK
|| FetchIntField(interp, dict, lit[LIT_MONTH], &fields.month)
!= TCL_OK
|| FetchIntField(interp, dict, lit[LIT_DAYOFMONTH],
&fields.dayOfMonth) != TCL_OK
|| TclGetIntFromObj(interp, objv[2], &changeover) != TCL_OK) {
return TCL_ERROR;
}
fields.era = era;
/*
* Get Julian day.
*/
GetJulianDayFromEraYearMonthDay(&fields, changeover);
/*
* Store Julian day in the dictionary - copy on write.
*/
if (Tcl_IsShared(dict)) {
dict = Tcl_DuplicateObj(dict);
Tcl_IncrRefCount(dict);
copied = 1;
}
status = Tcl_DictObjPut(interp, dict, lit[LIT_JULIANDAY],
Tcl_NewIntObj(fields.julianDay));
if (status == TCL_OK) {
Tcl_SetObjResult(interp, dict);
}
if (copied) {
Tcl_DecrRefCount(dict);
}
return status;
}
/*
*----------------------------------------------------------------------
*
* ClockGetjuliandayfromerayearweekdayObjCmd --
*
* Tcl command that converts a time from the ISO calendar to a Julian Day
* Number.
*
* Parameters:
* dict - Dictionary that contains 'era', 'iso8601Year', 'iso8601Week'
* and 'dayOfWeek' keys.
* changeover - Julian Day of changeover to the Gregorian calendar
*
* Results:
* Result is either TCL_OK, with the interpreter result being the
* dictionary augmented with a 'julianDay' key, or TCL_ERROR, with the
* result being an error message.
*
*----------------------------------------------------------------------
*/
static int
ClockGetjuliandayfromerayearweekdayObjCmd(
ClientData clientData, /* Opaque pointer to literal pool, etc. */
Tcl_Interp *interp, /* Tcl interpreter */
int objc, /* Parameter count */
Tcl_Obj *const *objv) /* Parameter vector */
{
TclDateFields fields;
Tcl_Obj *dict;
ClockClientData *data = (ClockClientData *)clientData;
Tcl_Obj *const *lit = data->literals;
int changeover;
int copied = 0;
int status;
int era = 0;
/*
* Check params.
*/
if (objc != 3) {
Tcl_WrongNumArgs(interp, 1, objv, "dict changeover");
return TCL_ERROR;
}
dict = objv[1];
if (FetchEraField(interp, dict, lit[LIT_ERA], &era) != TCL_OK
|| FetchIntField(interp, dict, lit[LIT_ISO8601YEAR],
&fields.iso8601Year) != TCL_OK
|| FetchIntField(interp, dict, lit[LIT_ISO8601WEEK],
&fields.iso8601Week) != TCL_OK
|| FetchIntField(interp, dict, lit[LIT_DAYOFWEEK],
&fields.dayOfWeek) != TCL_OK
|| TclGetIntFromObj(interp, objv[2], &changeover) != TCL_OK) {
return TCL_ERROR;
}
fields.era = era;
/*
* Get Julian day.
*/
GetJulianDayFromEraYearWeekDay(&fields, changeover);
/*
* Store Julian day in the dictionary - copy on write.
*/
if (Tcl_IsShared(dict)) {
dict = Tcl_DuplicateObj(dict);
Tcl_IncrRefCount(dict);
copied = 1;
}
status = Tcl_DictObjPut(interp, dict, lit[LIT_JULIANDAY],
Tcl_NewIntObj(fields.julianDay));
if (status == TCL_OK) {
Tcl_SetObjResult(interp, dict);
}
if (copied) {
Tcl_DecrRefCount(dict);
}
return status;
}
/*
*----------------------------------------------------------------------
*
* ConvertLocalToUTC --
*
* Converts a time (in a TclDateFields structure) from the local wall
* clock to UTC.
*
* Results:
* Returns a standard Tcl result.
*
* Side effects:
* Populates the 'seconds' field if successful; stores an error message
* in the interpreter result on failure.
*
*----------------------------------------------------------------------
*/
static int
ConvertLocalToUTC(
Tcl_Interp *interp, /* Tcl interpreter */
TclDateFields *fields, /* Fields of the time */
Tcl_Obj *tzdata, /* Time zone data */
int changeover) /* Julian Day of the Gregorian transition */
{
int rowc; /* Number of rows in tzdata */
Tcl_Obj **rowv; /* Pointers to the rows */
/*
* Unpack the tz data.
*/
if (TclListObjGetElements(interp, tzdata, &rowc, &rowv) != TCL_OK) {
return TCL_ERROR;
}
/*
* Special case: If the time zone is :localtime, the tzdata will be empty.
* Use 'mktime' to convert the time to local
*/
if (rowc == 0) {
return ConvertLocalToUTCUsingC(interp, fields, changeover);
} else {
return ConvertLocalToUTCUsingTable(interp, fields, rowc, rowv);
}
}
/*
*----------------------------------------------------------------------
*
* ConvertLocalToUTCUsingTable --
*
* Converts a time (in a TclDateFields structure) from local time in a
* given time zone to UTC.
*
* Results:
* Returns a standard Tcl result.
*
* Side effects:
* Stores an error message in the interpreter if an error occurs; if
* successful, stores the 'seconds' field in 'fields.
*
*----------------------------------------------------------------------
*/
static int
ConvertLocalToUTCUsingTable(
Tcl_Interp *interp, /* Tcl interpreter */
TclDateFields *fields, /* Time to convert, with 'seconds' filled in */
int rowc, /* Number of points at which time changes */
Tcl_Obj *const rowv[]) /* Points at which time changes */
{
Tcl_Obj *row;
int cellc;
Tcl_Obj **cellv;
int have[8];
int nHave = 0;
int i;
int found;
/*
* Perform an initial lookup assuming that local == UTC, and locate the
* last time conversion prior to that time. Get the offset from that row,
* and look up again. Continue until we find an offset that we found
* before. This definition, rather than "the same offset" ensures that we
* don't enter an endless loop, as would otherwise happen when trying to
* convert a non-existent time such as 02:30 during the US Spring Daylight
* Saving Time transition.
*/
found = 0;
fields->tzOffset = 0;
fields->seconds = fields->localSeconds;
while (!found) {
row = LookupLastTransition(interp, fields->seconds, rowc, rowv);
if ((row == NULL)
|| TclListObjGetElements(interp, row, &cellc,
&cellv) != TCL_OK
|| TclGetIntFromObj(interp, cellv[1],
&fields->tzOffset) != TCL_OK) {
return TCL_ERROR;
}
found = 0;
for (i = 0; !found && i < nHave; ++i) {
if (have[i] == fields->tzOffset) {
found = 1;
break;
}
}
if (!found) {
if (nHave == 8) {
Tcl_Panic("loop in ConvertLocalToUTCUsingTable");
}
have[nHave++] = fields->tzOffset;
}
fields->seconds = fields->localSeconds - fields->tzOffset;
}
fields->tzOffset = have[i];
fields->seconds = fields->localSeconds - fields->tzOffset;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ConvertLocalToUTCUsingC --
*
* Converts a time from local wall clock to UTC when the local time zone
* cannot be determined. Uses 'mktime' to do the job.
*
* Results:
* Returns a standard Tcl result.
*
* Side effects:
* Stores an error message in the interpreter if an error occurs; if
* successful, stores the 'seconds' field in 'fields.
*
*----------------------------------------------------------------------
*/
static int
ConvertLocalToUTCUsingC(
Tcl_Interp *interp, /* Tcl interpreter */
TclDateFields *fields, /* Time to convert, with 'seconds' filled in */
int changeover) /* Julian Day of the Gregorian transition */
{
struct tm timeVal;
int localErrno;
int secondOfDay;
Tcl_WideInt jsec;
/*
* Convert the given time to a date.
*/
jsec = fields->localSeconds + JULIAN_SEC_POSIX_EPOCH;
fields->julianDay = (int) (jsec / SECONDS_PER_DAY);
secondOfDay = (int)(jsec % SECONDS_PER_DAY);
if (secondOfDay < 0) {
secondOfDay += SECONDS_PER_DAY;
fields->julianDay--;
}
GetGregorianEraYearDay(fields, changeover);
GetMonthDay(fields);
/*
* Convert the date/time to a 'struct tm'.
*/
timeVal.tm_year = fields->year - 1900;
timeVal.tm_mon = fields->month - 1;
timeVal.tm_mday = fields->dayOfMonth;
timeVal.tm_hour = (secondOfDay / 3600) % 24;
timeVal.tm_min = (secondOfDay / 60) % 60;
timeVal.tm_sec = secondOfDay % 60;
timeVal.tm_isdst = -1;
timeVal.tm_wday = -1;
timeVal.tm_yday = -1;
/*
* Get local time. It is rumored that mktime is not thread safe on some
* platforms, so seize a mutex before attempting this.
*/
TzsetIfNecessary();
Tcl_MutexLock(&clockMutex);
errno = 0;
fields->seconds = (Tcl_WideInt) mktime(&timeVal);
localErrno = errno;
Tcl_MutexUnlock(&clockMutex);
/*
* If conversion fails, report an error.
*/
if (localErrno != 0
|| (fields->seconds == -1 && timeVal.tm_yday == -1)) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"time value too large/small to represent", -1));
return TCL_ERROR;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ConvertUTCToLocal --
*
* Converts a time (in a TclDateFields structure) from UTC to local time.
*
* Results:
* Returns a standard Tcl result.
*
* Side effects:
* Populates the 'tzName' and 'tzOffset' fields.
*
*----------------------------------------------------------------------
*/
static int
ConvertUTCToLocal(
Tcl_Interp *interp, /* Tcl interpreter */
TclDateFields *fields, /* Fields of the time */
Tcl_Obj *tzdata, /* Time zone data */
int changeover) /* Julian Day of the Gregorian transition */
{
int rowc; /* Number of rows in tzdata */
Tcl_Obj **rowv; /* Pointers to the rows */
/*
* Unpack the tz data.
*/
if (TclListObjGetElements(interp, tzdata, &rowc, &rowv) != TCL_OK) {
return TCL_ERROR;
}
/*
* Special case: If the time zone is :localtime, the tzdata will be empty.
* Use 'localtime' to convert the time to local
*/
if (rowc == 0) {
return ConvertUTCToLocalUsingC(interp, fields, changeover);
} else {
return ConvertUTCToLocalUsingTable(interp, fields, rowc, rowv);
}
}
/*
*----------------------------------------------------------------------
*
* ConvertUTCToLocalUsingTable --
*
* Converts UTC to local time, given a table of transition points
*
* Results:
* Returns a standard Tcl result
*
* Side effects:
* On success, fills fields->tzName, fields->tzOffset and
* fields->localSeconds. On failure, places an error message in the
* interpreter result.
*
*----------------------------------------------------------------------
*/
static int
ConvertUTCToLocalUsingTable(
Tcl_Interp *interp, /* Tcl interpreter */
TclDateFields *fields, /* Fields of the date */
int rowc, /* Number of rows in the conversion table
* (>= 1) */
Tcl_Obj *const rowv[]) /* Rows of the conversion table */
{
Tcl_Obj *row; /* Row containing the current information */
int cellc; /* Count of cells in the row (must be 4) */
Tcl_Obj **cellv; /* Pointers to the cells */
/*
* Look up the nearest transition time.
*/
row = LookupLastTransition(interp, fields->seconds, rowc, rowv);
if (row == NULL ||
TclListObjGetElements(interp, row, &cellc, &cellv) != TCL_OK ||
TclGetIntFromObj(interp, cellv[1], &fields->tzOffset) != TCL_OK) {
return TCL_ERROR;
}
/*
* Convert the time.
*/
fields->tzName = cellv[3];
Tcl_IncrRefCount(fields->tzName);
fields->localSeconds = fields->seconds + fields->tzOffset;
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ConvertUTCToLocalUsingC --
*
* Converts UTC to localtime in cases where the local time zone is not
* determinable, using the C 'localtime' function to do it.
*
* Results:
* Returns a standard Tcl result.
*
* Side effects:
* On success, fills fields->tzName, fields->tzOffset and
* fields->localSeconds. On failure, places an error message in the
* interpreter result.
*
*----------------------------------------------------------------------
*/
static int
ConvertUTCToLocalUsingC(
Tcl_Interp *interp, /* Tcl interpreter */
TclDateFields *fields, /* Time to convert, with 'seconds' filled in */
int changeover) /* Julian Day of the Gregorian transition */
{
time_t tock;
struct tm *timeVal; /* Time after conversion */
int diff; /* Time zone diff local-Greenwich */
char buffer[16]; /* Buffer for time zone name */
/*
* Use 'localtime' to determine local year, month, day, time of day.
*/
tock = (time_t) fields->seconds;
if ((Tcl_WideInt) tock != fields->seconds) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"number too large to represent as a Posix time", -1));
Tcl_SetErrorCode(interp, "CLOCK", "argTooLarge", NULL);
return TCL_ERROR;
}
TzsetIfNecessary();
timeVal = ThreadSafeLocalTime(&tock);
if (timeVal == NULL) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(
"localtime failed (clock value may be too "
"large/small to represent)", -1));
Tcl_SetErrorCode(interp, "CLOCK", "localtimeFailed", NULL);
return TCL_ERROR;
}
/*
* Fill in the date in 'fields' and use it to derive Julian Day.
*/
fields->era = CE;
fields->year = timeVal->tm_year + 1900;
fields->month = timeVal->tm_mon + 1;
fields->dayOfMonth = timeVal->tm_mday;
GetJulianDayFromEraYearMonthDay(fields, changeover);
/*
* Convert that value to seconds.
*/
fields->localSeconds = (((fields->julianDay * (Tcl_WideInt) 24
+ timeVal->tm_hour) * 60 + timeVal->tm_min) * 60
+ timeVal->tm_sec) - JULIAN_SEC_POSIX_EPOCH;
/*
* Determine a time zone offset and name; just use +hhmm for the name.
*/
diff = (int) (fields->localSeconds - fields->seconds);
fields->tzOffset = diff;
if (diff < 0) {
*buffer = '-';
diff = -diff;
} else {
*buffer = '+';
}
sprintf(buffer+1, "%02d", diff / 3600);
diff %= 3600;
sprintf(buffer+3, "%02d", diff / 60);
diff %= 60;
if (diff > 0) {
sprintf(buffer+5, "%02d", diff);
}
fields->tzName = Tcl_NewStringObj(buffer, -1);
Tcl_IncrRefCount(fields->tzName);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* LookupLastTransition --
*
* Given a UTC time and a tzdata array, looks up the last transition on
* or before the given time.
*
* Results:
* Returns a pointer to the row, or NULL if an error occurs.
*
*----------------------------------------------------------------------
*/
static Tcl_Obj *
LookupLastTransition(
Tcl_Interp *interp, /* Interpreter for error messages */
Tcl_WideInt tick, /* Time from the epoch */
int rowc, /* Number of rows of tzdata */
Tcl_Obj *const *rowv) /* Rows in tzdata */
{
int l;
int u;
Tcl_Obj *compObj;
Tcl_WideInt compVal;
/*
* Examine the first row to make sure we're in bounds.
*/
if (Tcl_ListObjIndex(interp, rowv[0], 0, &compObj) != TCL_OK
|| TclGetWideIntFromObj(interp, compObj, &compVal) != TCL_OK) {
return NULL;
}
/*
* Bizarre case - first row doesn't begin at MIN_WIDE_INT. Return it
* anyway.
*/
if (tick < compVal) {
return rowv[0];
}
/*
* Binary-search to find the transition.
*/
l = 0;
u = rowc-1;
while (l < u) {
int m = (l + u + 1) / 2;
if (Tcl_ListObjIndex(interp, rowv[m], 0, &compObj) != TCL_OK ||
TclGetWideIntFromObj(interp, compObj, &compVal) != TCL_OK) {
return NULL;
}
if (tick >= compVal) {
l = m;
} else {
u = m-1;
}
}
return rowv[l];
}
/*
*----------------------------------------------------------------------
*
* GetYearWeekDay --
*
* Given a date with Julian Calendar Day, compute the year, week, and day
* in the ISO8601 calendar.
*
* Results:
* None.
*
* Side effects:
* Stores 'iso8601Year', 'iso8601Week' and 'dayOfWeek' in the date
* fields.
*
*----------------------------------------------------------------------
*/
static void
GetYearWeekDay(
TclDateFields *fields, /* Date to convert, must have 'julianDay' */
int changeover) /* Julian Day Number of the Gregorian
* transition */
{
TclDateFields temp;
int dayOfFiscalYear;
/*
* Find the given date, minus three days, plus one year. That date's
* iso8601 year is an upper bound on the ISO8601 year of the given date.
*/
temp.julianDay = fields->julianDay - 3;
GetGregorianEraYearDay(&temp, changeover);
if (temp.era == BCE) {
temp.iso8601Year = temp.year - 1;
} else {
temp.iso8601Year = temp.year + 1;
}
temp.iso8601Week = 1;
temp.dayOfWeek = 1;
GetJulianDayFromEraYearWeekDay(&temp, changeover);
/*
* temp.julianDay is now the start of an ISO8601 year, either the one
* corresponding to the given date, or the one after. If we guessed high,
* move one year earlier
*/
if (fields->julianDay < temp.julianDay) {
if (temp.era == BCE) {
temp.iso8601Year += 1;
} else {
temp.iso8601Year -= 1;
}
GetJulianDayFromEraYearWeekDay(&temp, changeover);
}
fields->iso8601Year = temp.iso8601Year;
dayOfFiscalYear = fields->julianDay - temp.julianDay;
fields->iso8601Week = (dayOfFiscalYear / 7) + 1;
fields->dayOfWeek = (dayOfFiscalYear + 1) % 7;
if (fields->dayOfWeek < 1) {
fields->dayOfWeek += 7;
}
}
/*
*----------------------------------------------------------------------
*
* GetGregorianEraYearDay --
*
* Given a Julian Day Number, extracts the year and day of the year and
* puts them into TclDateFields, along with the era (BCE or CE) and a
* flag indicating whether the date is Gregorian or Julian.
*
* Results:
* None.
*
* Side effects:
* Stores 'era', 'gregorian', 'year', and 'dayOfYear'.
*
*----------------------------------------------------------------------
*/
static void
GetGregorianEraYearDay(
TclDateFields *fields, /* Date fields containing 'julianDay' */
int changeover) /* Gregorian transition date */
{
int jday = fields->julianDay;
int day;
int year;
int n;
if (jday >= changeover) {
/*
* Gregorian calendar.
*/
fields->gregorian = 1;
year = 1;
/*
* n = Number of 400-year cycles since 1 January, 1 CE in the
* proleptic Gregorian calendar. day = remaining days.
*/
day = jday - JDAY_1_JAN_1_CE_GREGORIAN;
n = day / FOUR_CENTURIES;
day %= FOUR_CENTURIES;
if (day < 0) {
day += FOUR_CENTURIES;
n--;
}
year += 400 * n;
/*
* n = number of centuries since the start of (year);
* day = remaining days
*/
n = day / ONE_CENTURY_GREGORIAN;
day %= ONE_CENTURY_GREGORIAN;
if (n > 3) {
/*
* 31 December in the last year of a 400-year cycle.
*/
n = 3;
day += ONE_CENTURY_GREGORIAN;
}
year += 100 * n;
} else {
/*
* Julian calendar.
*/
fields->gregorian = 0;
year = 1;
day = jday - JDAY_1_JAN_1_CE_JULIAN;
}
/*
* n = number of 4-year cycles; days = remaining days.
*/
n = day / FOUR_YEARS;
day %= FOUR_YEARS;
if (day < 0) {
day += FOUR_YEARS;
n--;
}
year += 4 * n;
/*
* n = number of years; days = remaining days.
*/
n = day / ONE_YEAR;
day %= ONE_YEAR;
if (n > 3) {
/*
* 31 December of a leap year.
*/
n = 3;
day += 365;
}
year += n;
/*
* store era/year/day back into fields.
*/
if (year <= 0) {
fields->era = BCE;
fields->year = 1 - year;
} else {
fields->era = CE;
fields->year = year;
}
fields->dayOfYear = day + 1;
}
/*
*----------------------------------------------------------------------
*
* GetMonthDay --
*
* Given a date as year and day-of-year, find month and day.
*
* Results:
* None.
*
* Side effects:
* Stores 'month' and 'dayOfMonth' in the 'fields' structure.
*
*----------------------------------------------------------------------
*/
static void
GetMonthDay(
TclDateFields *fields) /* Date to convert */
{
int day = fields->dayOfYear;
int month;
const int *h = hath[IsGregorianLeapYear(fields)];
for (month = 0; month < 12 && day > h[month]; ++month) {
day -= h[month];
}
fields->month = month+1;
fields->dayOfMonth = day;
}
/*
*----------------------------------------------------------------------
*
* GetJulianDayFromEraYearWeekDay --
*
* Given a TclDateFields structure containing era, ISO8601 year, ISO8601
* week, and day of week, computes the Julian Day Number.
*
* Results:
* None.
*
* Side effects:
* Stores 'julianDay' in the fields.
*
*----------------------------------------------------------------------
*/
static void
GetJulianDayFromEraYearWeekDay(
TclDateFields *fields, /* Date to convert */
int changeover) /* Julian Day Number of the Gregorian
* transition */
{
int firstMonday; /* Julian day number of week 1, day 1 in the
* given year */
TclDateFields firstWeek;
/*
* Find January 4 in the ISO8601 year, which will always be in week 1.
*/
firstWeek.era = fields->era;
firstWeek.year = fields->iso8601Year;
firstWeek.month = 1;
firstWeek.dayOfMonth = 4;
GetJulianDayFromEraYearMonthDay(&firstWeek, changeover);
/*
* Find Monday of week 1.
*/
firstMonday = WeekdayOnOrBefore(1, firstWeek.julianDay);
/*
* Advance to the given week and day.
*/
fields->julianDay = firstMonday + 7 * (fields->iso8601Week - 1)
+ fields->dayOfWeek - 1;
}
/*
*----------------------------------------------------------------------
*
* GetJulianDayFromEraYearMonthDay --
*
* Given era, year, month, and dayOfMonth (in TclDateFields), and the
* Gregorian transition date, computes the Julian Day Number.
*
* Results:
* None.
*
* Side effects:
* Stores day number in 'julianDay'
*
*----------------------------------------------------------------------
*/
static void
GetJulianDayFromEraYearMonthDay(
TclDateFields *fields, /* Date to convert */
int changeover) /* Gregorian transition date as a Julian Day */
{
int year, ym1, month, mm1, q, r, ym1o4, ym1o100, ym1o400;
if (fields->era == BCE) {
year = 1 - fields->year;
} else {
year = fields->year;
}
/*
* Reduce month modulo 12.
*/
month = fields->month;
mm1 = month - 1;
q = mm1 / 12;
r = (mm1 % 12);
if (r < 0) {
r += 12;
q -= 1;
}
year += q;
month = r + 1;
ym1 = year - 1;
/*
* Adjust the year after reducing the month.
*/
fields->gregorian = 1;
if (year < 1) {
fields->era = BCE;
fields->year = 1-year;
} else {
fields->era = CE;
fields->year = year;
}
/*
* Try an initial conversion in the Gregorian calendar.
*/
#if 0 /* BUG https://core.tcl-lang.org/tcl/tktview?name=da340d4f32 */
ym1o4 = ym1 / 4;
#else
/*
* Have to make sure quotient is truncated towards 0 when negative.
* See above bug for details. The casts are necessary.
*/
if (ym1 >= 0)
ym1o4 = ym1 / 4;
else {
ym1o4 = - (int) (((unsigned int) -ym1) / 4);
}
#endif
if (ym1 % 4 < 0) {
ym1o4--;
}
ym1o100 = ym1 / 100;
if (ym1 % 100 < 0) {
ym1o100--;
}
ym1o400 = ym1 / 400;
if (ym1 % 400 < 0) {
ym1o400--;
}
fields->julianDay = JDAY_1_JAN_1_CE_GREGORIAN - 1
+ fields->dayOfMonth
+ daysInPriorMonths[IsGregorianLeapYear(fields)][month - 1]
+ (ONE_YEAR * ym1)
+ ym1o4
- ym1o100
+ ym1o400;
/*
* If the resulting date is before the Gregorian changeover, convert in
* the Julian calendar instead.
*/
if (fields->julianDay < changeover) {
fields->gregorian = 0;
fields->julianDay = JDAY_1_JAN_1_CE_JULIAN - 1
+ fields->dayOfMonth
+ daysInPriorMonths[year%4 == 0][month - 1]
+ (365 * ym1)
+ ym1o4;
}
}
/*
*----------------------------------------------------------------------
*
* IsGregorianLeapYear --
*
* Tests whether a given year is a leap year, in either Julian or
* Gregorian calendar.
*
* Results:
* Returns 1 for a leap year, 0 otherwise.
*
*----------------------------------------------------------------------
*/
static int
IsGregorianLeapYear(
TclDateFields *fields) /* Date to test */
{
int year = fields->year;
if (fields->era == BCE) {
year = 1 - year;
}
if (year%4 != 0) {
return 0;
} else if (!(fields->gregorian)) {
return 1;
} else if (year%400 == 0) {
return 1;
} else if (year%100 == 0) {
return 0;
} else {
return 1;
}
}
/*
*----------------------------------------------------------------------
*
* WeekdayOnOrBefore --
*
* Finds the Julian Day Number of a given day of the week that falls on
* or before a given date, expressed as Julian Day Number.
*
* Results:
* Returns the Julian Day Number
*
*----------------------------------------------------------------------
*/
static int
WeekdayOnOrBefore(
int dayOfWeek, /* Day of week; Sunday == 0 or 7 */
int julianDay) /* Reference date */
{
int k = (dayOfWeek + 6) % 7;
if (k < 0) {
k += 7;
}
return julianDay - ((julianDay - k) % 7);
}
/*
*----------------------------------------------------------------------
*
* ClockGetenvObjCmd --
*
* Tcl command that reads an environment variable from the system
*
* Usage:
* ::tcl::clock::getEnv NAME
*
* Parameters:
* NAME - Name of the environment variable desired
*
* Results:
* Returns a standard Tcl result. Returns an error if the variable does
* not exist, with a message left in the interpreter. Returns TCL_OK and
* the value of the variable if the variable does exist,
*
*----------------------------------------------------------------------
*/
int
ClockGetenvObjCmd(
ClientData clientData,
Tcl_Interp *interp,
int objc,
Tcl_Obj *const objv[])
{
#ifdef _WIN32
const WCHAR *varName;
const WCHAR *varValue;
Tcl_DString ds;
#else
const char *varName;
const char *varValue;
#endif
(void)clientData;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "name");
return TCL_ERROR;
}
#ifdef _WIN32
varName = (const WCHAR *)Tcl_WinUtfToTChar(TclGetString(objv[1]), -1, &ds);
varValue = _wgetenv(varName);
Tcl_DStringFree(&ds);
if (varValue == NULL) {
varValue = L"";
}
Tcl_WinTCharToUtf((TCHAR *)varValue, -1, &ds);
Tcl_DStringResult(interp, &ds);
#else
varName = TclGetString(objv[1]);
varValue = getenv(varName);
if (varValue == NULL) {
varValue = "";
}
Tcl_SetObjResult(interp, Tcl_NewStringObj(varValue, -1));
#endif
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ThreadSafeLocalTime --
*
* Wrapper around the 'localtime' library function to make it thread
* safe.
*
* Results:
* Returns a pointer to a 'struct tm' in thread-specific data.
*
* Side effects:
* Invokes localtime or localtime_r as appropriate.
*
*----------------------------------------------------------------------
*/
static struct tm *
ThreadSafeLocalTime(
const time_t *timePtr) /* Pointer to the number of seconds since the
* local system's epoch */
{
/*
* Get a thread-local buffer to hold the returned time.
*/
struct tm *tmPtr = (struct tm *)Tcl_GetThreadData(&tmKey, sizeof(struct tm));
#ifdef HAVE_LOCALTIME_R
localtime_r(timePtr, tmPtr);
#else
struct tm *sysTmPtr;
Tcl_MutexLock(&clockMutex);
sysTmPtr = localtime(timePtr);
if (sysTmPtr == NULL) {
Tcl_MutexUnlock(&clockMutex);
return NULL;
}
memcpy(tmPtr, localtime(timePtr), sizeof(struct tm));
Tcl_MutexUnlock(&clockMutex);
#endif
return tmPtr;
}
/*----------------------------------------------------------------------
*
* ClockClicksObjCmd --
*
* Returns a high-resolution counter.
*
* Results:
* Returns a standard Tcl result.
*
* Side effects:
* None.
*
* This function implements the 'clock clicks' Tcl command. Refer to the user
* documentation for details on what it does.
*
*----------------------------------------------------------------------
*/
int
ClockClicksObjCmd(
ClientData clientData, /* Client data is unused */
Tcl_Interp *interp, /* Tcl interpreter */
int objc, /* Parameter count */
Tcl_Obj *const *objv) /* Parameter values */
{
static const char *const clicksSwitches[] = {
"-milliseconds", "-microseconds", NULL
};
enum ClicksSwitch {
CLICKS_MILLIS, CLICKS_MICROS, CLICKS_NATIVE
};
int index = CLICKS_NATIVE;
Tcl_Time now;
Tcl_WideInt clicks = 0;
(void)clientData;
switch (objc) {
case 1:
break;
case 2:
if (Tcl_GetIndexFromObj(interp, objv[1], clicksSwitches, "option", 0,
&index) != TCL_OK) {
return TCL_ERROR;
}
break;
default:
Tcl_WrongNumArgs(interp, 1, objv, "?-switch?");
return TCL_ERROR;
}
switch (index) {
case CLICKS_MILLIS:
Tcl_GetTime(&now);
clicks = (Tcl_WideInt) now.sec * 1000 + now.usec / 1000;
break;
case CLICKS_NATIVE:
#ifdef TCL_WIDE_CLICKS
clicks = TclpGetWideClicks();
#else
clicks = (Tcl_WideInt) TclpGetClicks();
#endif
break;
case CLICKS_MICROS:
clicks = TclpGetMicroseconds();
break;
}
Tcl_SetObjResult(interp, Tcl_NewWideIntObj(clicks));
return TCL_OK;
}
/*----------------------------------------------------------------------
*
* ClockMillisecondsObjCmd -
*
* Returns a count of milliseconds since the epoch.
*
* Results:
* Returns a standard Tcl result.
*
* Side effects:
* None.
*
* This function implements the 'clock milliseconds' Tcl command. Refer to the
* user documentation for details on what it does.
*
*----------------------------------------------------------------------
*/
int
ClockMillisecondsObjCmd(
ClientData clientData, /* Client data is unused */
Tcl_Interp *interp, /* Tcl interpreter */
int objc, /* Parameter count */
Tcl_Obj *const *objv) /* Parameter values */
{
Tcl_Time now;
(void)clientData;
if (objc != 1) {
Tcl_WrongNumArgs(interp, 1, objv, NULL);
return TCL_ERROR;
}
Tcl_GetTime(&now);
Tcl_SetObjResult(interp, Tcl_NewWideIntObj((Tcl_WideInt)
now.sec * 1000 + now.usec / 1000));
return TCL_OK;
}
/*----------------------------------------------------------------------
*
* ClockMicrosecondsObjCmd -
*
* Returns a count of microseconds since the epoch.
*
* Results:
* Returns a standard Tcl result.
*
* Side effects:
* None.
*
* This function implements the 'clock microseconds' Tcl command. Refer to the
* user documentation for details on what it does.
*
*----------------------------------------------------------------------
*/
int
ClockMicrosecondsObjCmd(
ClientData clientData, /* Client data is unused */
Tcl_Interp *interp, /* Tcl interpreter */
int objc, /* Parameter count */
Tcl_Obj *const *objv) /* Parameter values */
{
(void)clientData;
if (objc != 1) {
Tcl_WrongNumArgs(interp, 1, objv, NULL);
return TCL_ERROR;
}
Tcl_SetObjResult(interp, Tcl_NewWideIntObj(TclpGetMicroseconds()));
return TCL_OK;
}
/*
*-----------------------------------------------------------------------------
*
* ClockParseformatargsObjCmd --
*
* Parses the arguments for [clock format].
*
* Results:
* Returns a standard Tcl result, whose value is a four-element list
* comprising the time format, the locale, and the timezone.
*
* This function exists because the loop that parses the [clock format]
* options is a known performance "hot spot", and is implemented in an effort
* to speed that particular code up.
*
*-----------------------------------------------------------------------------
*/
static int
ClockParseformatargsObjCmd(
ClientData clientData, /* Client data containing literal pool */
Tcl_Interp *interp, /* Tcl interpreter */
int objc, /* Parameter count */
Tcl_Obj *const objv[]) /* Parameter vector */
{
ClockClientData *dataPtr = (ClockClientData *)clientData;
Tcl_Obj **litPtr = dataPtr->literals;
Tcl_Obj *results[3]; /* Format, locale and timezone */
#define formatObj results[0]
#define localeObj results[1]
#define timezoneObj results[2]
int gmtFlag = 0;
static const char *const options[] = { /* Command line options expected */
"-format", "-gmt", "-locale",
"-timezone", NULL };
enum optionInd {
CLOCK_FORMAT_FORMAT, CLOCK_FORMAT_GMT, CLOCK_FORMAT_LOCALE,
CLOCK_FORMAT_TIMEZONE
};
int optionIndex; /* Index of an option. */
int saw = 0; /* Flag == 1 if option was seen already. */
Tcl_WideInt clockVal; /* Clock value - just used to parse. */
int i;
/*
* Args consist of a time followed by keyword-value pairs.
*/
if (objc < 2 || (objc % 2) != 0) {
Tcl_WrongNumArgs(interp, 0, objv,
"clock format clockval ?-format string? "
"?-gmt boolean? ?-locale LOCALE? ?-timezone ZONE?");
Tcl_SetErrorCode(interp, "CLOCK", "wrongNumArgs", NULL);
return TCL_ERROR;
}
/*
* Extract values for the keywords.
*/
formatObj = litPtr[LIT__DEFAULT_FORMAT];
localeObj = litPtr[LIT_C];
timezoneObj = litPtr[LIT__NIL];
for (i = 2; i < objc; i+=2) {
if (Tcl_GetIndexFromObj(interp, objv[i], options, "option", 0,
&optionIndex) != TCL_OK) {
Tcl_SetErrorCode(interp, "CLOCK", "badOption",
Tcl_GetString(objv[i]), NULL);
return TCL_ERROR;
}
switch (optionIndex) {
case CLOCK_FORMAT_FORMAT:
formatObj = objv[i+1];
break;
case CLOCK_FORMAT_GMT:
if (Tcl_GetBooleanFromObj(interp, objv[i+1], &gmtFlag) != TCL_OK){
return TCL_ERROR;
}
break;
case CLOCK_FORMAT_LOCALE:
localeObj = objv[i+1];
break;
case CLOCK_FORMAT_TIMEZONE:
timezoneObj = objv[i+1];
break;
}
saw |= 1 << optionIndex;
}
/*
* Check options.
*/
if (TclGetWideIntFromObj(interp, objv[1], &clockVal) != TCL_OK) {
return TCL_ERROR;
}
if ((saw & (1 << CLOCK_FORMAT_GMT))
&& (saw & (1 << CLOCK_FORMAT_TIMEZONE))) {
Tcl_SetObjResult(interp, litPtr[LIT_CANNOT_USE_GMT_AND_TIMEZONE]);
Tcl_SetErrorCode(interp, "CLOCK", "gmtWithTimezone", NULL);
return TCL_ERROR;
}
if (gmtFlag) {
timezoneObj = litPtr[LIT_GMT];
}
/*
* Return options as a list.
*/
Tcl_SetObjResult(interp, Tcl_NewListObj(3, results));
return TCL_OK;
#undef timezoneObj
#undef localeObj
#undef formatObj
}
/*----------------------------------------------------------------------
*
* ClockSecondsObjCmd -
*
* Returns a count of microseconds since the epoch.
*
* Results:
* Returns a standard Tcl result.
*
* Side effects:
* None.
*
* This function implements the 'clock seconds' Tcl command. Refer to the user
* documentation for details on what it does.
*
*----------------------------------------------------------------------
*/
int
ClockSecondsObjCmd(
ClientData clientData, /* Client data is unused */
Tcl_Interp *interp, /* Tcl interpreter */
int objc, /* Parameter count */
Tcl_Obj *const *objv) /* Parameter values */
{
Tcl_Time now;
(void)clientData;
if (objc != 1) {
Tcl_WrongNumArgs(interp, 1, objv, NULL);
return TCL_ERROR;
}
Tcl_GetTime(&now);
Tcl_SetObjResult(interp, Tcl_NewWideIntObj((Tcl_WideInt) now.sec));
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* TzsetIfNecessary --
*
* Calls the tzset() library function if the contents of the TZ
* environment variable has changed.
*
* Results:
* None.
*
* Side effects:
* Calls tzset.
*
*----------------------------------------------------------------------
*/
#ifdef _WIN32
#define getenv(x) _wgetenv(L##x)
#else
#define WCHAR char
#define wcslen strlen
#define wcscmp strcmp
#define wcscpy strcpy
#endif
static void
TzsetIfNecessary(void)
{
static WCHAR* tzWas = (WCHAR *)INT2PTR(-1); /* Previous value of TZ, protected by
* clockMutex. */
static long tzLastRefresh = 0; /* Used for latency before next refresh */
static size_t tzEnvEpoch = 0; /* Last env epoch, for faster signaling,
that TZ changed via TCL */
const WCHAR *tzIsNow; /* Current value of TZ */
/*
* Prevent performance regression on some platforms by resolving of system time zone:
* small latency for check whether environment was changed (once per second)
* no latency if environment was changed with tcl-env (compare both epoch values)
*/
Tcl_Time now;
Tcl_GetTime(&now);
if (now.sec == tzLastRefresh && tzEnvEpoch == TclEnvEpoch) {
return;
}
tzEnvEpoch = TclEnvEpoch;
tzLastRefresh = now.sec;
Tcl_MutexLock(&clockMutex);
tzIsNow = getenv("TZ");
if (tzIsNow != NULL && (tzWas == NULL || tzWas == (WCHAR *)INT2PTR(-1)
|| wcscmp(tzIsNow, tzWas) != 0)) {
tzset();
if (tzWas != NULL && tzWas != (WCHAR *)INT2PTR(-1)) {
ckfree(tzWas);
}
tzWas = (WCHAR *)ckalloc(sizeof(WCHAR) * (wcslen(tzIsNow) + 1));
wcscpy(tzWas, tzIsNow);
} else if (tzIsNow == NULL && tzWas != NULL) {
tzset();
if (tzWas != (WCHAR *)INT2PTR(-1)) ckfree(tzWas);
tzWas = NULL;
}
Tcl_MutexUnlock(&clockMutex);
}
/*
*----------------------------------------------------------------------
*
* ClockDeleteCmdProc --
*
* Remove a reference to the clock client data, and clean up memory
* when it's all gone.
*
* Results:
* None.
*
*----------------------------------------------------------------------
*/
static void
ClockDeleteCmdProc(
ClientData clientData) /* Opaque pointer to the client data */
{
ClockClientData *data = (ClockClientData *)clientData;
int i;
if (data->refCount-- <= 1) {
for (i = 0; i < LIT__END; ++i) {
Tcl_DecrRefCount(data->literals[i]);
}
ckfree(data->literals);
ckfree(data);
}
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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