diff options
Diffstat (limited to 'win/tclWinTime.c')
| -rw-r--r-- | win/tclWinTime.c | 122 |
1 files changed, 93 insertions, 29 deletions
diff --git a/win/tclWinTime.c b/win/tclWinTime.c index 0630caf..de0e3dd 100644 --- a/win/tclWinTime.c +++ b/win/tclWinTime.c @@ -4,16 +4,15 @@ * Contains Windows specific versions of Tcl functions that * obtain time values from the operating system. * - * Copyright 1995 by Sun Microsystems, Inc. + * Copyright 1995-1998 by Sun Microsystems, Inc. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclWinTime.c,v 1.3 1999/03/10 05:52:54 stanton Exp $ + * RCS: @(#) $Id: tclWinTime.c,v 1.4 1999/04/16 00:48:10 stanton Exp $ */ -#include "tclInt.h" -#include "tclPort.h" +#include "tclWinInt.h" #define SECSPERDAY (60L * 60L * 24L) #define SECSPERYEAR (SECSPERDAY * 365L) @@ -32,6 +31,12 @@ static int leapDays[] = { -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }; +typedef struct ThreadSpecificData { + char tzName[64]; /* Time zone name */ + struct tm tm; /* time information */ +} ThreadSpecificData; +static Tcl_ThreadDataKey dataKey; + /* * Declarations for functions defined later in this file. */ @@ -162,14 +167,70 @@ TclpGetTime(timePtr) */ char * -TclpGetTZName() +TclpGetTZName(int dst) { - tzset(); - if (_daylight && _tzname[1] != NULL) { - return _tzname[1]; - } else { - return _tzname[0]; + int len; + char *zone, *p; + TIME_ZONE_INFORMATION tz; + Tcl_Encoding encoding; + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + char *name = tsdPtr->tzName; + + /* + * tzset() under Borland doesn't seem to set up tzname[] at all. + * tzset() under MSVC has the following weird observed behavior: + * First time we call "clock format [clock seconds] -format %Z -gmt 1" + * we get "GMT", but on all subsequent calls we get the current time + * zone string, even though env(TZ) is GMT and the variable _timezone + * is 0. + */ + + name[0] = '\0'; + + zone = getenv("TZ"); + if (zone != NULL) { + /* + * TZ is of form "NST-4:30NDT", where "NST" would be the + * name of the standard time zone for this area, "-4:30" is + * the offset from GMT in hours, and "NDT is the name of + * the daylight savings time zone in this area. The offset + * and DST strings are optional. + */ + + len = strlen(zone); + if (len > 3) { + len = 3; + } + if (dst != 0) { + /* + * Skip the offset string and get the DST string. + */ + + p = zone + len; + p += strspn(p, "+-:0123456789"); + if (*p != '\0') { + zone = p; + len = strlen(zone); + if (len > 3) { + len = 3; + } + } + } + Tcl_ExternalToUtf(NULL, NULL, zone, len, 0, NULL, name, + sizeof(tsdPtr->tzName), NULL, NULL, NULL); + } + if ((name[0] == '\0') + && (GetTimeZoneInformation(&tz) != TIME_ZONE_ID_UNKNOWN)) { + encoding = Tcl_GetEncoding(NULL, "unicode"); + Tcl_ExternalToUtf(NULL, encoding, + (char *) ((dst) ? tz.DaylightName : tz.StandardName), -1, + 0, NULL, name, sizeof(tsdPtr->tzName), NULL, NULL, NULL); + Tcl_FreeEncoding(encoding); + } + if (name[0] == '\0') { + return "%Z"; } + return name; } /* @@ -196,7 +257,6 @@ TclpGetDate(t, useGMT) int useGMT; { const time_t *tp = (const time_t *) t; - struct tm *tmPtr; long time; @@ -209,10 +269,11 @@ TclpGetDate(t, useGMT) * algorithm ignores daylight savings time before the epoch. */ - time = *tp - _timezone; - if (time >= 0) { + if (*tp >= 0) { return localtime(tp); } + + time = *tp - _timezone; /* * If we aren't near to overflowing the long, just add the bias and @@ -274,7 +335,7 @@ TclpGetDate(t, useGMT) * the epoch (midnight Jan 1 1970). * * Results: - * Returns a statically allocated struct tm. + * Returns a (per thread) statically allocated struct tm. * * Side effects: * Updates the values of the static struct tm. @@ -286,10 +347,13 @@ static struct tm * ComputeGMT(tp) const time_t *tp; { - static struct tm tm; /* This should be allocated per thread.*/ + struct tm *tmPtr; long tmp, rem; int isLeap; int *days; + ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey); + + tmPtr = &tsdPtr->tm; /* * Compute the 4 year span containing the specified time. @@ -329,47 +393,47 @@ ComputeGMT(tp) } } } - tm.tm_year = tmp; + tmPtr->tm_year = tmp; /* * Compute the day of year and leave the seconds in the current day in * the remainder. */ - tm.tm_yday = rem / SECSPERDAY; + tmPtr->tm_yday = rem / SECSPERDAY; rem %= SECSPERDAY; /* * Compute the time of day. */ - tm.tm_hour = rem / 3600; + tmPtr->tm_hour = rem / 3600; rem %= 3600; - tm.tm_min = rem / 60; - tm.tm_sec = rem % 60; + tmPtr->tm_min = rem / 60; + tmPtr->tm_sec = rem % 60; /* * Compute the month and day of month. */ days = (isLeap) ? leapDays : normalDays; - for (tmp = 1; days[tmp] < tm.tm_yday; tmp++) { + for (tmp = 1; days[tmp] < tmPtr->tm_yday; tmp++) { } - tm.tm_mon = --tmp; - tm.tm_mday = tm.tm_yday - days[tmp]; + tmPtr->tm_mon = --tmp; + tmPtr->tm_mday = tmPtr->tm_yday - days[tmp]; /* * Compute day of week. Epoch started on a Thursday. */ - tm.tm_wday = (*tp / SECSPERDAY) + 4; + tmPtr->tm_wday = (*tp / SECSPERDAY) + 4; if ((*tp % SECSPERDAY) < 0) { - tm.tm_wday--; + tmPtr->tm_wday--; } - tm.tm_wday %= 7; - if (tm.tm_wday < 0) { - tm.tm_wday += 7; + tmPtr->tm_wday %= 7; + if (tmPtr->tm_wday < 0) { + tmPtr->tm_wday += 7; } - return &tm; + return tmPtr; } |