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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 1.3 1999/03/10 05:52:47 stanton Exp $
*/
#include "tcl.h"
#include "tclInt.h"
#include "tclPort.h"
/*
* Function prototypes for local procedures in this file:
*/
static int FormatClock _ANSI_ARGS_((Tcl_Interp *interp,
unsigned long 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;
unsigned long baseClock, clockVal;
long zone;
Tcl_Obj *baseObjPtr = NULL;
char *scanStr;
static char *switches[] =
{"clicks", "format", "scan", "seconds", (char *) NULL};
static char *formatSwitches[] = {"-format", "-gmt", (char *) NULL};
static 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 (index) {
case 0: /* clicks */
if (objc != 2) {
Tcl_WrongNumArgs(interp, 2, objv, NULL);
return TCL_ERROR;
}
Tcl_SetLongObj(resultPtr, (long) TclpGetClicks());
return TCL_OK;
case 1: /* format */
if ((objc < 3) || (objc > 7)) {
wrongFmtArgs:
Tcl_WrongNumArgs(interp, 2, objv,
"clockval ?-format string? ?-gmt boolean?");
return TCL_ERROR;
}
if (Tcl_GetLongFromObj(interp, objv[2], (long*) &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, (unsigned long) clockVal, useGMT,
format);
case 2: /* 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_GetLongFromObj(interp, baseObjPtr,
(long*) &baseClock) != TCL_OK) {
return TCL_ERROR;
}
} else {
baseClock = TclpGetSeconds();
}
if (useGMT) {
zone = -50000; /* Force GMT */
} else {
zone = TclpGetTimeZone((unsigned long) baseClock);
}
scanStr = Tcl_GetStringFromObj(objv[2], &dummy);
if (TclGetDate(scanStr, (unsigned long) baseClock, zone,
(unsigned long *) &clockVal) < 0) {
Tcl_AppendStringsToObj(resultPtr,
"unable to convert date-time string \"",
scanStr, "\"", (char *) NULL);
return TCL_ERROR;
}
Tcl_SetLongObj(resultPtr, (long) clockVal);
return TCL_OK;
case 3: /* 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. */
unsigned long clockVal; /* Time in seconds. */
int useGMT; /* Boolean */
char *format; /* Format string */
{
struct tm *timeDataPtr;
Tcl_DString buffer;
int bufSize;
char *p;
#ifdef TCL_USE_TIMEZONE_VAR
int savedTimeZone;
char *savedTZEnv;
#endif
Tcl_Obj *resultPtr;
resultPtr = Tcl_GetObjResult(interp);
#ifdef HAVE_TZSET
/*
* Some systems forgot to call tzset in localtime, make sure its done.
*/
static int calledTzset = 0;
if (!calledTzset) {
tzset();
calledTzset = 1;
}
#endif
#ifdef TCL_USE_TIMEZONE_VAR
/*
* This is a horrible kludge for systems not having the timezone in
* struct tm. No matter what was specified, they use the global time
* zone. (Thanks Solaris).
*/
if (useGMT) {
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", "GMT", TCL_GLOBAL_ONLY);
savedTimeZone = timezone;
timezone = 0;
tzset();
}
#endif
timeDataPtr = TclpGetDate((TclpTime_t) &clockVal, 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(&buffer);
Tcl_DStringSetLength(&buffer, bufSize);
if ((TclStrftime(buffer.string, (unsigned int) bufSize, format,
timeDataPtr) == 0) && (*format != '\0')) {
Tcl_AppendStringsToObj(resultPtr, "bad format string \"",
format, "\"", (char *) NULL);
return TCL_ERROR;
}
#ifdef TCL_USE_TIMEZONE_VAR
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();
}
#endif
Tcl_SetStringObj(resultPtr, buffer.string, -1);
Tcl_DStringFree(&buffer);
return TCL_OK;
}
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