360 lines
9.0 KiB
C
360 lines
9.0 KiB
C
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/*
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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 1.20 96/07/23 16:14:45
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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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static int ParseTime _ANSI_ARGS_((Tcl_Interp *interp,
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char *string, unsigned long *timePtr));
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/*
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*-----------------------------------------------------------------------------
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*
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* Tcl_ClockCmd --
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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_ClockCmd (dummy, interp, argc, argv)
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ClientData dummy; /* Not used. */
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Tcl_Interp *interp; /* Current interpreter. */
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int argc; /* Number of arguments. */
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char **argv; /* Argument strings. */
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{
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int c;
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size_t length;
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char **argPtr;
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int useGMT = 0;
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unsigned long clockVal;
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if (argc < 2) {
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Tcl_AppendResult(interp, "wrong # args: should be \"",
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argv[0], " option ?arg ...?\"", (char *) NULL);
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return TCL_ERROR;
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}
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c = argv[1][0];
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length = strlen(argv[1]);
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if ((c == 'c') && (strncmp(argv[1], "clicks", length) == 0)) {
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if (argc != 2) {
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Tcl_AppendResult(interp, "wrong # arguments: must be \"",
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argv[0], " clicks\"", (char *) NULL);
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return TCL_ERROR;
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}
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sprintf(interp->result, "%lu", TclpGetClicks());
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return TCL_OK;
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} else if ((c == 'f') && (strncmp(argv[1], "format", length) == 0)) {
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char *format = "%a %b %d %X %Z %Y";
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if ((argc < 3) || (argc > 7)) {
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wrongFmtArgs:
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Tcl_AppendResult(interp, "wrong # args: ", argv [0],
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" format clockval ?-format string? ?-gmt boolean?",
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(char *) NULL);
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return TCL_ERROR;
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}
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if (ParseTime(interp, argv[2], &clockVal) != TCL_OK) {
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return TCL_ERROR;
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}
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argPtr = argv+3;
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argc -= 3;
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while ((argc > 1) && (argPtr[0][0] == '-')) {
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if (strcmp(argPtr[0], "-format") == 0) {
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format = argPtr[1];
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} else if (strcmp(argPtr[0], "-gmt") == 0) {
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if (Tcl_GetBoolean(interp, argPtr[1], &useGMT) != TCL_OK) {
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return TCL_ERROR;
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}
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} else {
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Tcl_AppendResult(interp, "bad option \"", argPtr[0],
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"\": must be -format or -gmt", (char *) NULL);
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return TCL_ERROR;
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}
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argPtr += 2;
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argc -= 2;
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}
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if (argc != 0) {
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goto wrongFmtArgs;
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}
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return FormatClock(interp, clockVal, useGMT, format);
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} else if ((c == 's') && (strncmp(argv[1], "scan", length) == 0)) {
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unsigned long baseClock;
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long zone;
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char * baseStr = NULL;
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if ((argc < 3) || (argc > 7)) {
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wrongScanArgs:
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Tcl_AppendResult (interp, "wrong # args: ", argv [0],
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" scan dateString ?-base clockValue? ?-gmt boolean?",
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(char *) NULL);
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return TCL_ERROR;
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}
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argPtr = argv+3;
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argc -= 3;
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while ((argc > 1) && (argPtr[0][0] == '-')) {
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if (strcmp(argPtr[0], "-base") == 0) {
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baseStr = argPtr[1];
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} else if (strcmp(argPtr[0], "-gmt") == 0) {
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if (Tcl_GetBoolean(interp, argPtr[1], &useGMT) != TCL_OK) {
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return TCL_ERROR;
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}
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} else {
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Tcl_AppendResult(interp, "bad option \"", argPtr[0],
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"\": must be -base or -gmt", (char *) NULL);
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return TCL_ERROR;
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}
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argPtr += 2;
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argc -= 2;
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}
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if (argc != 0) {
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goto wrongScanArgs;
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}
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if (baseStr != NULL) {
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if (ParseTime(interp, baseStr, &baseClock) != TCL_OK)
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return TCL_ERROR;
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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(baseClock);
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}
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if (TclGetDate(argv[2], baseClock, zone, &clockVal) < 0) {
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Tcl_AppendResult(interp, "unable to convert date-time string \"",
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argv[2], "\"", (char *) NULL);
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return TCL_ERROR;
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}
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sprintf(interp->result, "%lu", (long) clockVal);
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return TCL_OK;
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} else if ((c == 's') && (strncmp(argv[1], "seconds", length) == 0)) {
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if (argc != 2) {
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Tcl_AppendResult(interp, "wrong # arguments: must be \"",
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argv[0], " seconds\"", (char *) NULL);
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return TCL_ERROR;
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}
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sprintf(interp->result, "%lu", TclpGetSeconds());
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return TCL_OK;
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} else {
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Tcl_AppendResult(interp, "unknown option \"", argv[1],
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"\": must be clicks, format, scan, or seconds",
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(char *) NULL);
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return TCL_ERROR;
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}
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}
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/*
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*-----------------------------------------------------------------------------
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*
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* ParseTime --
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*
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* Given a string, produce the corresponding time_t value.
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*
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* Results:
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* The return value is normally TCL_OK; in this case *timePtr
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* will be set to the integer value equivalent to string. If
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* string is improperly formed then TCL_ERROR is returned and
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* an error message will be left in interp->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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ParseTime(interp, string, timePtr)
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Tcl_Interp *interp;
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char *string;
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unsigned long *timePtr;
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{
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char *end, *p;
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unsigned long i;
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/*
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* Since some strtoul functions don't detect negative numbers, check
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* in advance.
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*/
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errno = 0;
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for (p = (char *) string; isspace(UCHAR(*p)); p++) {
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/* Empty loop body. */
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}
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if (*p == '+') {
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p++;
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}
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i = strtoul(p, &end, 0);
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if (end == p) {
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goto badTime;
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}
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if (errno == ERANGE) {
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interp->result = "integer value too large to represent";
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Tcl_SetErrorCode(interp, "ARITH", "IOVERFLOW",
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interp->result, (char *) NULL);
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return TCL_ERROR;
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}
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while ((*end != '\0') && isspace(UCHAR(*end))) {
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end++;
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}
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if (*end != '\0') {
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goto badTime;
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}
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*timePtr = (time_t) i;
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if (*timePtr != i) {
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goto badTime;
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}
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return TCL_OK;
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badTime:
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Tcl_AppendResult (interp, "expected unsigned time but got \"",
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string, "\"", (char *) NULL);
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return TCL_ERROR;
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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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#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 = 0, 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) {
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Tcl_DStringFree(&buffer);
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Tcl_AppendResult(interp, "bad format string", (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_DStringResult(interp, &buffer);
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return TCL_OK;
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}
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