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Diffstat (limited to 'generic/tclClock.c')
| -rw-r--r-- | generic/tclClock.c | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/generic/tclClock.c b/generic/tclClock.c new file mode 100644 index 0000000..bf45583 --- /dev/null +++ b/generic/tclClock.c @@ -0,0 +1,307 @@ +/* + * 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; +} + |