308 lines
7.5 KiB
C
308 lines
7.5 KiB
C
/*
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* tclClock.c --
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*
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* Contains the time and date related commands. This code
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* is derived from the time and date facilities of TclX,
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* by Mark Diekhans and Karl Lehenbauer.
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*
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* Copyright 1991-1995 Karl Lehenbauer and Mark Diekhans.
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* Copyright (c) 1995 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tclClock.c 1.36 97/06/02 10:14:17
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*/
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#include "tcl.h"
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#include "tclInt.h"
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#include "tclPort.h"
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/*
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* Function prototypes for local procedures in this file:
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*/
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static int FormatClock _ANSI_ARGS_((Tcl_Interp *interp,
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unsigned long clockVal, int useGMT,
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char *format));
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/*
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*-------------------------------------------------------------------------
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*
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* Tcl_ClockObjCmd --
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*
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* This procedure is invoked to process the "clock" Tcl command.
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* See the user documentation for details on what it does.
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*
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* Results:
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* A standard Tcl result.
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*
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* Side effects:
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* See the user documentation.
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*
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*-------------------------------------------------------------------------
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*/
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int
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Tcl_ClockObjCmd (client, interp, objc, objv)
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ClientData client; /* Not used. */
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Tcl_Interp *interp; /* Current interpreter. */
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int objc; /* Number of arguments. */
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Tcl_Obj *CONST objv[]; /* Argument values. */
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{
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Tcl_Obj *resultPtr;
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int index;
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Tcl_Obj *CONST *objPtr;
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int useGMT = 0;
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char *format = "%a %b %d %X %Z %Y";
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int dummy;
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unsigned long baseClock, clockVal;
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long zone;
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Tcl_Obj *baseObjPtr = NULL;
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char *scanStr;
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static char *switches[] =
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{"clicks", "format", "scan", "seconds", (char *) NULL};
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static char *formatSwitches[] = {"-format", "-gmt", (char *) NULL};
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static char *scanSwitches[] = {"-base", "-gmt", (char *) NULL};
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resultPtr = Tcl_GetObjResult(interp);
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if (objc < 2) {
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Tcl_WrongNumArgs(interp, 1, objv, "option ?arg ...?");
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return TCL_ERROR;
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}
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if (Tcl_GetIndexFromObj(interp, objv[1], switches, "option", 0, &index)
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!= TCL_OK) {
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return TCL_ERROR;
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}
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switch (index) {
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case 0: /* clicks */
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if (objc != 2) {
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Tcl_WrongNumArgs(interp, 1, objv, "clicks");
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return TCL_ERROR;
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}
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Tcl_SetLongObj(resultPtr, (long) TclpGetClicks());
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return TCL_OK;
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case 1: /* format */
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if ((objc < 3) || (objc > 7)) {
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wrongFmtArgs:
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Tcl_WrongNumArgs(interp, 1, objv,
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"format clockval ?-format string? ?-gmt boolean?");
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return TCL_ERROR;
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}
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if (Tcl_GetLongFromObj(interp, objv[2], (long*) &clockVal)
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!= TCL_OK) {
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return TCL_ERROR;
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}
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objPtr = objv+3;
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objc -= 3;
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while (objc > 1) {
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if (Tcl_GetIndexFromObj(interp, objPtr[0], formatSwitches,
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"switch", 0, &index) != TCL_OK) {
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return TCL_ERROR;
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}
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switch (index) {
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case 0: /* -format */
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format = Tcl_GetStringFromObj(objPtr[1], &dummy);
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break;
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case 1: /* -gmt */
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if (Tcl_GetBooleanFromObj(interp, objPtr[1],
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&useGMT) != TCL_OK) {
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return TCL_ERROR;
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}
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break;
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}
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objPtr += 2;
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objc -= 2;
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}
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if (objc != 0) {
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goto wrongFmtArgs;
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}
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return FormatClock(interp, (unsigned long) clockVal, useGMT,
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format);
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case 2: /* scan */
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if ((objc < 3) || (objc > 7)) {
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wrongScanArgs:
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Tcl_WrongNumArgs(interp, 1, objv,
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"scan dateString ?-base clockValue? ?-gmt boolean?");
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return TCL_ERROR;
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}
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objPtr = objv+3;
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objc -= 3;
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while (objc > 1) {
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if (Tcl_GetIndexFromObj(interp, objPtr[0], scanSwitches,
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"switch", 0, &index) != TCL_OK) {
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return TCL_ERROR;
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}
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switch (index) {
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case 0: /* -base */
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baseObjPtr = objPtr[1];
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break;
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case 1: /* -gmt */
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if (Tcl_GetBooleanFromObj(interp, objPtr[1],
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&useGMT) != TCL_OK) {
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return TCL_ERROR;
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}
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break;
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}
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objPtr += 2;
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objc -= 2;
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}
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if (objc != 0) {
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goto wrongScanArgs;
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}
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if (baseObjPtr != NULL) {
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if (Tcl_GetLongFromObj(interp, baseObjPtr,
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(long*) &baseClock) != TCL_OK) {
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return TCL_ERROR;
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}
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} else {
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baseClock = TclpGetSeconds();
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}
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if (useGMT) {
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zone = -50000; /* Force GMT */
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} else {
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zone = TclpGetTimeZone((unsigned long) baseClock);
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}
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scanStr = Tcl_GetStringFromObj(objv[2], &dummy);
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if (TclGetDate(scanStr, (unsigned long) baseClock, zone,
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(unsigned long *) &clockVal) < 0) {
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Tcl_AppendStringsToObj(resultPtr,
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"unable to convert date-time string \"",
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scanStr, "\"", (char *) NULL);
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return TCL_ERROR;
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}
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Tcl_SetLongObj(resultPtr, (long) clockVal);
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return TCL_OK;
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case 3: /* seconds */
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if (objc != 2) {
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Tcl_WrongNumArgs(interp, 1, objv, "seconds");
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return TCL_ERROR;
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}
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Tcl_SetLongObj(resultPtr, (long) TclpGetSeconds());
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return TCL_OK;
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default:
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return TCL_ERROR; /* Should never be reached. */
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}
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}
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/*
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*-----------------------------------------------------------------------------
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*
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* FormatClock --
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*
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* Formats a time value based on seconds into a human readable
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* string.
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*
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* Results:
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* Standard Tcl result.
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*
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* Side effects:
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* None.
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*
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*-----------------------------------------------------------------------------
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*/
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static int
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FormatClock(interp, clockVal, useGMT, format)
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Tcl_Interp *interp; /* Current interpreter. */
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unsigned long clockVal; /* Time in seconds. */
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int useGMT; /* Boolean */
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char *format; /* Format string */
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{
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struct tm *timeDataPtr;
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Tcl_DString buffer;
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int bufSize;
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char *p;
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#ifdef TCL_USE_TIMEZONE_VAR
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int savedTimeZone;
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char *savedTZEnv;
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#endif
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Tcl_Obj *resultPtr;
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resultPtr = Tcl_GetObjResult(interp);
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#ifdef HAVE_TZSET
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/*
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* Some systems forgot to call tzset in localtime, make sure its done.
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*/
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static int calledTzset = 0;
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if (!calledTzset) {
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tzset();
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calledTzset = 1;
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}
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#endif
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#ifdef TCL_USE_TIMEZONE_VAR
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/*
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* This is a horrible kludge for systems not having the timezone in
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* struct tm. No matter what was specified, they use the global time
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* zone. (Thanks Solaris).
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*/
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if (useGMT) {
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char *varValue;
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varValue = Tcl_GetVar2(interp, "env", "TZ", TCL_GLOBAL_ONLY);
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if (varValue != NULL) {
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savedTZEnv = strcpy(ckalloc(strlen(varValue) + 1), varValue);
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} else {
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savedTZEnv = NULL;
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}
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Tcl_SetVar2(interp, "env", "TZ", "GMT", TCL_GLOBAL_ONLY);
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savedTimeZone = timezone;
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timezone = 0;
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tzset();
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}
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#endif
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timeDataPtr = TclpGetDate((time_t *) &clockVal, useGMT);
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/*
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* Make a guess at the upper limit on the substituted string size
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* based on the number of percents in the string.
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*/
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for (bufSize = 1, p = format; *p != '\0'; p++) {
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if (*p == '%') {
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bufSize += 40;
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} else {
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bufSize++;
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}
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}
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Tcl_DStringInit(&buffer);
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Tcl_DStringSetLength(&buffer, bufSize);
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if ((TclStrftime(buffer.string, (unsigned int) bufSize, format,
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timeDataPtr) == 0) && (*format != '\0')) {
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Tcl_AppendStringsToObj(resultPtr, "bad format string \"",
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format, "\"", (char *) NULL);
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return TCL_ERROR;
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}
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#ifdef TCL_USE_TIMEZONE_VAR
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if (useGMT) {
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if (savedTZEnv != NULL) {
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Tcl_SetVar2(interp, "env", "TZ", savedTZEnv, TCL_GLOBAL_ONLY);
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ckfree(savedTZEnv);
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} else {
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Tcl_UnsetVar2(interp, "env", "TZ", TCL_GLOBAL_ONLY);
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}
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timezone = savedTimeZone;
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tzset();
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}
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#endif
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Tcl_SetStringObj(resultPtr, buffer.string, -1);
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Tcl_DStringFree(&buffer);
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return TCL_OK;
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}
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