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authorrjohnson <rjohnson>1998-03-26 14:45:59 (GMT)
committerrjohnson <rjohnson>1998-03-26 14:45:59 (GMT)
commit2b5738da524e944cda39e24c0a87b745a43bd8c3 (patch)
tree6e8c9473978f6dab66c601e911721a7bd9d70b1b /generic/tclClock.c
parentc6a259aeeca4814a97cf6694814c63e74e4e18fa (diff)
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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.
+ *
+ * SCCS: @(#) tclClock.c 1.37 97/07/29 10:29:58
+ */
+
+#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((time_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;
+}
+