tclClock.c
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上传日期:2015-12-11
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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 1991-1995 Karl Lehenbauer and Mark Diekhans.
- * Copyright (c) 1995 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: tclClock.c,v 1.20.2.4 2007/08/25 17:12:20 kennykb Exp $
- */
- #include "tcl.h"
- #include "tclInt.h"
- #include "tclPort.h"
- /*
- * The date parsing stuff uses lexx and has tons o statics.
- */
- TCL_DECLARE_MUTEX(clockMutex)
- /*
- * Function prototypes for local procedures in this file:
- */
- static int FormatClock _ANSI_ARGS_((Tcl_Interp *interp,
- Tcl_WideInt clockVal, int useGMT,
- char *format));
- /*
- *-------------------------------------------------------------------------
- *
- * Tcl_ClockObjCmd --
- *
- * This procedure is invoked to process the "clock" Tcl command.
- * See the user documentation for details on what it does.
- *
- * Results:
- * A standard Tcl result.
- *
- * Side effects:
- * See the user documentation.
- *
- *-------------------------------------------------------------------------
- */
- int
- Tcl_ClockObjCmd (client, interp, objc, objv)
- ClientData client; /* Not used. */
- Tcl_Interp *interp; /* Current interpreter. */
- int objc; /* Number of arguments. */
- Tcl_Obj *CONST objv[]; /* Argument values. */
- {
- Tcl_Obj *resultPtr;
- int index;
- Tcl_Obj *CONST *objPtr;
- int useGMT = 0;
- char *format = "%a %b %d %X %Z %Y";
- int dummy;
- Tcl_WideInt baseClock, clockVal;
- long zone;
- Tcl_Obj *baseObjPtr = NULL;
- char *scanStr;
- int n;
-
- static CONST char *switches[] =
- {"clicks", "format", "scan", "seconds", (char *) NULL};
- enum command { COMMAND_CLICKS, COMMAND_FORMAT, COMMAND_SCAN,
- COMMAND_SECONDS
- };
- static CONST char *formatSwitches[] = {"-format", "-gmt", (char *) NULL};
- static CONST char *scanSwitches[] = {"-base", "-gmt", (char *) NULL};
- resultPtr = Tcl_GetObjResult(interp);
- if (objc < 2) {
- Tcl_WrongNumArgs(interp, 1, objv, "option ?arg ...?");
- return TCL_ERROR;
- }
- if (Tcl_GetIndexFromObj(interp, objv[1], switches, "option", 0, &index)
- != TCL_OK) {
- return TCL_ERROR;
- }
- switch ((enum command) index) {
- case COMMAND_CLICKS: { /* clicks */
- int forceMilli = 0;
- if (objc == 3) {
- format = Tcl_GetStringFromObj(objv[2], &n);
- if ( ( n >= 2 )
- && ( strncmp( format, "-milliseconds",
- (unsigned int) n) == 0 ) ) {
- forceMilli = 1;
- } else {
- Tcl_AppendStringsToObj(resultPtr,
- "bad switch "", format,
- "": must be -milliseconds", (char *) NULL);
- return TCL_ERROR;
- }
- } else if (objc != 2) {
- Tcl_WrongNumArgs(interp, 2, objv, "?-milliseconds?");
- return TCL_ERROR;
- }
- if (forceMilli) {
- /*
- * We can enforce at least millisecond granularity
- */
- Tcl_Time time;
- Tcl_GetTime(&time);
- Tcl_SetLongObj(resultPtr,
- (long) (time.sec*1000 + time.usec/1000));
- } else {
- Tcl_SetLongObj(resultPtr, (long) TclpGetClicks());
- }
- return TCL_OK;
- }
- case COMMAND_FORMAT: /* format */
- if ((objc < 3) || (objc > 7)) {
- wrongFmtArgs:
- Tcl_WrongNumArgs(interp, 2, objv,
- "clockval ?-format string? ?-gmt boolean?");
- return TCL_ERROR;
- }
- if (Tcl_GetWideIntFromObj(interp, objv[2], &clockVal)
- != TCL_OK) {
- return TCL_ERROR;
- }
-
- objPtr = objv+3;
- objc -= 3;
- while (objc > 1) {
- if (Tcl_GetIndexFromObj(interp, objPtr[0], formatSwitches,
- "switch", 0, &index) != TCL_OK) {
- return TCL_ERROR;
- }
- switch (index) {
- case 0: /* -format */
- format = Tcl_GetStringFromObj(objPtr[1], &dummy);
- break;
- case 1: /* -gmt */
- if (Tcl_GetBooleanFromObj(interp, objPtr[1],
- &useGMT) != TCL_OK) {
- return TCL_ERROR;
- }
- break;
- }
- objPtr += 2;
- objc -= 2;
- }
- if (objc != 0) {
- goto wrongFmtArgs;
- }
- return FormatClock(interp, clockVal, useGMT,
- format);
- case COMMAND_SCAN: /* scan */
- if ((objc < 3) || (objc > 7)) {
- wrongScanArgs:
- Tcl_WrongNumArgs(interp, 2, objv,
- "dateString ?-base clockValue? ?-gmt boolean?");
- return TCL_ERROR;
- }
- objPtr = objv+3;
- objc -= 3;
- while (objc > 1) {
- if (Tcl_GetIndexFromObj(interp, objPtr[0], scanSwitches,
- "switch", 0, &index) != TCL_OK) {
- return TCL_ERROR;
- }
- switch (index) {
- case 0: /* -base */
- baseObjPtr = objPtr[1];
- break;
- case 1: /* -gmt */
- if (Tcl_GetBooleanFromObj(interp, objPtr[1],
- &useGMT) != TCL_OK) {
- return TCL_ERROR;
- }
- break;
- }
- objPtr += 2;
- objc -= 2;
- }
- if (objc != 0) {
- goto wrongScanArgs;
- }
- if (baseObjPtr != NULL) {
- if (Tcl_GetWideIntFromObj(interp, baseObjPtr,
- &baseClock) != TCL_OK) {
- return TCL_ERROR;
- }
- } else {
- baseClock = TclpGetSeconds();
- }
- if (useGMT) {
- zone = -50000; /* Force GMT */
- } else {
- zone = TclpGetTimeZone(baseClock);
- }
- scanStr = Tcl_GetStringFromObj(objv[2], &dummy);
- Tcl_MutexLock(&clockMutex);
- if (TclGetDate(scanStr, baseClock, zone,
- &clockVal) < 0) {
- Tcl_MutexUnlock(&clockMutex);
- Tcl_AppendStringsToObj(resultPtr,
- "unable to convert date-time string "",
- scanStr, """, (char *) NULL);
- return TCL_ERROR;
- }
- Tcl_MutexUnlock(&clockMutex);
- Tcl_SetWideIntObj(resultPtr, clockVal);
- return TCL_OK;
- case COMMAND_SECONDS: /* seconds */
- if (objc != 2) {
- Tcl_WrongNumArgs(interp, 2, objv, NULL);
- return TCL_ERROR;
- }
- Tcl_SetLongObj(resultPtr, (long) TclpGetSeconds());
- return TCL_OK;
- default:
- return TCL_ERROR; /* Should never be reached. */
- }
- }
- /*
- *-----------------------------------------------------------------------------
- *
- * FormatClock --
- *
- * Formats a time value based on seconds into a human readable
- * string.
- *
- * Results:
- * Standard Tcl result.
- *
- * Side effects:
- * None.
- *
- *-----------------------------------------------------------------------------
- */
- static int
- FormatClock(interp, clockVal, useGMT, format)
- Tcl_Interp *interp; /* Current interpreter. */
- Tcl_WideInt clockVal; /* Time in seconds. */
- int useGMT; /* Boolean */
- char *format; /* Format string */
- {
- struct tm *timeDataPtr;
- Tcl_DString buffer, uniBuffer;
- int bufSize;
- char *p;
- int result;
- time_t tclockVal;
- #if !defined(HAVE_TM_ZONE) && !defined(WIN32)
- TIMEZONE_t savedTimeZone = 0; /* lint. */
- char *savedTZEnv = NULL; /* lint. */
- #endif
- #ifdef HAVE_TZSET
- /*
- * Some systems forgot to call tzset in localtime, make sure its done.
- */
- static int calledTzset = 0;
- Tcl_MutexLock(&clockMutex);
- if (!calledTzset) {
- tzset();
- calledTzset = 1;
- }
- Tcl_MutexUnlock(&clockMutex);
- #endif
- /*
- * If the user gave us -format "", just return now
- */
- if (*format == ' ') {
- return TCL_OK;
- }
- #if !defined(HAVE_TM_ZONE) && !defined(WIN32)
- /*
- * This is a kludge for systems not having the timezone string in
- * struct tm. No matter what was specified, they use the local
- * timezone string. Since this kludge requires fiddling with the
- * TZ environment variable, it will mess up if done on multiple
- * threads at once. Protect it with a the clock mutex.
- */
- Tcl_MutexLock( &clockMutex );
- if (useGMT) {
- CONST char *varValue;
- varValue = Tcl_GetVar2(interp, "env", "TZ", TCL_GLOBAL_ONLY);
- if (varValue != NULL) {
- savedTZEnv = strcpy(ckalloc(strlen(varValue) + 1), varValue);
- } else {
- savedTZEnv = NULL;
- }
- Tcl_SetVar2(interp, "env", "TZ", "GMT0", TCL_GLOBAL_ONLY);
- savedTimeZone = timezone;
- timezone = 0;
- tzset();
- }
- #endif
- tclockVal = (time_t) clockVal;
- timeDataPtr = TclpGetDate((TclpTime_t) &tclockVal, useGMT);
-
- /*
- * Make a guess at the upper limit on the substituted string size
- * based on the number of percents in the string.
- */
- for (bufSize = 1, p = format; *p != ' '; p++) {
- if (*p == '%') {
- bufSize += 40;
- if (p[1] == 'c') {
- bufSize += 226;
- }
- } else {
- bufSize++;
- }
- }
- Tcl_DStringInit(&uniBuffer);
- Tcl_UtfToExternalDString(NULL, format, -1, &uniBuffer);
- Tcl_DStringInit(&buffer);
- Tcl_DStringSetLength(&buffer, bufSize);
- /* If we haven't locked the clock mutex up above, lock it now. */
- #if defined(HAVE_TM_ZONE) || defined(WIN32)
- Tcl_MutexLock(&clockMutex);
- #endif
- result = TclpStrftime(buffer.string, (unsigned int) bufSize,
- Tcl_DStringValue(&uniBuffer), timeDataPtr, useGMT);
- #if defined(HAVE_TM_ZONE) || defined(WIN32)
- Tcl_MutexUnlock(&clockMutex);
- #endif
- Tcl_DStringFree(&uniBuffer);
- #if !defined(HAVE_TM_ZONE) && !defined(WIN32)
- if (useGMT) {
- if (savedTZEnv != NULL) {
- Tcl_SetVar2(interp, "env", "TZ", savedTZEnv, TCL_GLOBAL_ONLY);
- ckfree(savedTZEnv);
- } else {
- Tcl_UnsetVar2(interp, "env", "TZ", TCL_GLOBAL_ONLY);
- }
- timezone = savedTimeZone;
- tzset();
- }
- Tcl_MutexUnlock( &clockMutex );
- #endif
- if (result == 0) {
- /*
- * A zero return is the error case (can also mean the strftime
- * didn't get enough space to write into). We know it doesn't
- * mean that we wrote zero chars because the check for an empty
- * format string is above.
- */
- Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
- "bad format string "", format, """, (char *) NULL);
- return TCL_ERROR;
- }
- /*
- * Convert the time to UTF from external encoding [Bug: 3345]
- */
- Tcl_DStringInit(&uniBuffer);
- Tcl_ExternalToUtfDString(NULL, buffer.string, -1, &uniBuffer);
- Tcl_SetStringObj(Tcl_GetObjResult(interp), uniBuffer.string, -1);
- Tcl_DStringFree(&uniBuffer);
- Tcl_DStringFree(&buffer);
- return TCL_OK;
- }