/* * 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 1.20.2.3 2007/04/21 22:42:49 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 == '\0') { 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 != '\0'; p++) { if (*p == '%') { bufSize += 40; } 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; }