/[dtapublic]/projs/trunk/shared_source/c_tcl_base_7_5_w_mods/tclclock.c
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Revision 71 - (show annotations) (download)
Sat Nov 5 11:07:06 2016 UTC (7 years, 3 months ago) by dashley
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1 /* $Header$ */
2 /*
3 * tclClock.c --
4 *
5 * Contains the time and date related commands. This code
6 * is derived from the time and date facilities of TclX,
7 * by Mark Diekhans and Karl Lehenbauer.
8 *
9 * Copyright 1991-1995 Karl Lehenbauer and Mark Diekhans.
10 * Copyright (c) 1995 Sun Microsystems, Inc.
11 *
12 * See the file "license.terms" for information on usage and redistribution
13 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
14 *
15 * RCS: @(#) $Id: tclclock.c,v 1.1.1.1 2001/06/13 04:34:06 dtashley Exp $
16 */
17
18 #include "tcl.h"
19 #include "tclInt.h"
20 #include "tclPort.h"
21
22 /*
23 * The date parsing stuff uses lexx and has tons o statics.
24 */
25
26 TCL_DECLARE_MUTEX(clockMutex)
27
28 /*
29 * Function prototypes for local procedures in this file:
30 */
31
32 static int FormatClock _ANSI_ARGS_((Tcl_Interp *interp,
33 unsigned long clockVal, int useGMT,
34 char *format));
35
36 /*
37 *-------------------------------------------------------------------------
38 *
39 * Tcl_ClockObjCmd --
40 *
41 * This procedure is invoked to process the "clock" Tcl command.
42 * See the user documentation for details on what it does.
43 *
44 * Results:
45 * A standard Tcl result.
46 *
47 * Side effects:
48 * See the user documentation.
49 *
50 *-------------------------------------------------------------------------
51 */
52
53 int
54 Tcl_ClockObjCmd (client, interp, objc, objv)
55 ClientData client; /* Not used. */
56 Tcl_Interp *interp; /* Current interpreter. */
57 int objc; /* Number of arguments. */
58 Tcl_Obj *CONST objv[]; /* Argument values. */
59 {
60 Tcl_Obj *resultPtr;
61 int index;
62 Tcl_Obj *CONST *objPtr;
63 int useGMT = 0;
64 char *format = "%a %b %d %X %Z %Y";
65 int dummy;
66 unsigned long baseClock, clockVal;
67 long zone;
68 Tcl_Obj *baseObjPtr = NULL;
69 char *scanStr;
70
71 static char *switches[] =
72 {"clicks", "format", "scan", "seconds", (char *) NULL};
73 enum command { COMMAND_CLICKS, COMMAND_FORMAT, COMMAND_SCAN,
74 COMMAND_SECONDS
75 };
76 static char *formatSwitches[] = {"-format", "-gmt", (char *) NULL};
77 static char *scanSwitches[] = {"-base", "-gmt", (char *) NULL};
78
79 resultPtr = Tcl_GetObjResult(interp);
80 if (objc < 2) {
81 Tcl_WrongNumArgs(interp, 1, objv, "option ?arg ...?");
82 return TCL_ERROR;
83 }
84
85 if (Tcl_GetIndexFromObj(interp, objv[1], switches, "option", 0, &index)
86 != TCL_OK) {
87 return TCL_ERROR;
88 }
89 switch ((enum command) index) {
90 case COMMAND_CLICKS: { /* clicks */
91 int forceMilli = 0;
92
93 if (objc == 3) {
94 format = Tcl_GetStringFromObj(objv[2], &index);
95 if (strncmp(format, "-milliseconds",
96 (unsigned int) index) == 0) {
97 forceMilli = 1;
98 } else {
99 Tcl_AppendStringsToObj(resultPtr,
100 "bad switch \"", format,
101 "\": must be -milliseconds", (char *) NULL);
102 return TCL_ERROR;
103 }
104 } else if (objc != 2) {
105 Tcl_WrongNumArgs(interp, 2, objv, "?-milliseconds?");
106 return TCL_ERROR;
107 }
108 if (forceMilli) {
109 /*
110 * We can enforce at least millisecond granularity
111 */
112 Tcl_Time time;
113 TclpGetTime(&time);
114 Tcl_SetLongObj(resultPtr,
115 (long) (time.sec*1000 + time.usec/1000));
116 } else {
117 Tcl_SetLongObj(resultPtr, (long) TclpGetClicks());
118 }
119 return TCL_OK;
120 }
121
122 case COMMAND_FORMAT: /* format */
123 if ((objc < 3) || (objc > 7)) {
124 wrongFmtArgs:
125 Tcl_WrongNumArgs(interp, 2, objv,
126 "clockval ?-format string? ?-gmt boolean?");
127 return TCL_ERROR;
128 }
129
130 if (Tcl_GetLongFromObj(interp, objv[2], (long*) &clockVal)
131 != TCL_OK) {
132 return TCL_ERROR;
133 }
134
135 objPtr = objv+3;
136 objc -= 3;
137 while (objc > 1) {
138 if (Tcl_GetIndexFromObj(interp, objPtr[0], formatSwitches,
139 "switch", 0, &index) != TCL_OK) {
140 return TCL_ERROR;
141 }
142 switch (index) {
143 case 0: /* -format */
144 format = Tcl_GetStringFromObj(objPtr[1], &dummy);
145 break;
146 case 1: /* -gmt */
147 if (Tcl_GetBooleanFromObj(interp, objPtr[1],
148 &useGMT) != TCL_OK) {
149 return TCL_ERROR;
150 }
151 break;
152 }
153 objPtr += 2;
154 objc -= 2;
155 }
156 if (objc != 0) {
157 goto wrongFmtArgs;
158 }
159 return FormatClock(interp, (unsigned long) clockVal, useGMT,
160 format);
161
162 case COMMAND_SCAN: /* scan */
163 if ((objc < 3) || (objc > 7)) {
164 wrongScanArgs:
165 Tcl_WrongNumArgs(interp, 2, objv,
166 "dateString ?-base clockValue? ?-gmt boolean?");
167 return TCL_ERROR;
168 }
169
170 objPtr = objv+3;
171 objc -= 3;
172 while (objc > 1) {
173 if (Tcl_GetIndexFromObj(interp, objPtr[0], scanSwitches,
174 "switch", 0, &index) != TCL_OK) {
175 return TCL_ERROR;
176 }
177 switch (index) {
178 case 0: /* -base */
179 baseObjPtr = objPtr[1];
180 break;
181 case 1: /* -gmt */
182 if (Tcl_GetBooleanFromObj(interp, objPtr[1],
183 &useGMT) != TCL_OK) {
184 return TCL_ERROR;
185 }
186 break;
187 }
188 objPtr += 2;
189 objc -= 2;
190 }
191 if (objc != 0) {
192 goto wrongScanArgs;
193 }
194
195 if (baseObjPtr != NULL) {
196 if (Tcl_GetLongFromObj(interp, baseObjPtr,
197 (long*) &baseClock) != TCL_OK) {
198 return TCL_ERROR;
199 }
200 } else {
201 baseClock = TclpGetSeconds();
202 }
203
204 if (useGMT) {
205 zone = -50000; /* Force GMT */
206 } else {
207 zone = TclpGetTimeZone((unsigned long) baseClock);
208 }
209
210 scanStr = Tcl_GetStringFromObj(objv[2], &dummy);
211 Tcl_MutexLock(&clockMutex);
212 if (TclGetDate(scanStr, (unsigned long) baseClock, zone,
213 (unsigned long *) &clockVal) < 0) {
214 Tcl_MutexUnlock(&clockMutex);
215 Tcl_AppendStringsToObj(resultPtr,
216 "unable to convert date-time string \"",
217 scanStr, "\"", (char *) NULL);
218 return TCL_ERROR;
219 }
220 Tcl_MutexUnlock(&clockMutex);
221
222 Tcl_SetLongObj(resultPtr, (long) clockVal);
223 return TCL_OK;
224
225 case COMMAND_SECONDS: /* seconds */
226 if (objc != 2) {
227 Tcl_WrongNumArgs(interp, 2, objv, NULL);
228 return TCL_ERROR;
229 }
230 Tcl_SetLongObj(resultPtr, (long) TclpGetSeconds());
231 return TCL_OK;
232 default:
233 return TCL_ERROR; /* Should never be reached. */
234 }
235 }
236
237 /*
238 *-----------------------------------------------------------------------------
239 *
240 * FormatClock --
241 *
242 * Formats a time value based on seconds into a human readable
243 * string.
244 *
245 * Results:
246 * Standard Tcl result.
247 *
248 * Side effects:
249 * None.
250 *
251 *-----------------------------------------------------------------------------
252 */
253
254 static int
255 FormatClock(interp, clockVal, useGMT, format)
256 Tcl_Interp *interp; /* Current interpreter. */
257 unsigned long clockVal; /* Time in seconds. */
258 int useGMT; /* Boolean */
259 char *format; /* Format string */
260 {
261 struct tm *timeDataPtr;
262 Tcl_DString buffer;
263 int bufSize;
264 char *p;
265 int result;
266 time_t tclockVal;
267 #ifndef HAVE_TM_ZONE
268 int savedTimeZone = 0; /* lint. */
269 char *savedTZEnv = NULL; /* lint. */
270 #endif
271
272 #ifdef HAVE_TZSET
273 /*
274 * Some systems forgot to call tzset in localtime, make sure its done.
275 */
276 static int calledTzset = 0;
277
278 Tcl_MutexLock(&clockMutex);
279 if (!calledTzset) {
280 tzset();
281 calledTzset = 1;
282 }
283 Tcl_MutexUnlock(&clockMutex);
284 #endif
285
286 /*
287 * If the user gave us -format "", just return now
288 */
289 if (*format == '\0') {
290 return TCL_OK;
291 }
292
293 #ifndef HAVE_TM_ZONE
294 /*
295 * This is a kludge for systems not having the timezone string in
296 * struct tm. No matter what was specified, they use the local
297 * timezone string.
298 */
299
300 if (useGMT) {
301 char *varValue;
302
303 varValue = Tcl_GetVar2(interp, "env", "TZ", TCL_GLOBAL_ONLY);
304 if (varValue != NULL) {
305 savedTZEnv = strcpy(ckalloc(strlen(varValue) + 1), varValue);
306 } else {
307 savedTZEnv = NULL;
308 }
309 Tcl_SetVar2(interp, "env", "TZ", "GMT", TCL_GLOBAL_ONLY);
310 savedTimeZone = timezone;
311 timezone = 0;
312 tzset();
313 }
314 #endif
315
316 tclockVal = clockVal;
317 timeDataPtr = TclpGetDate((TclpTime_t) &tclockVal, useGMT);
318
319 /*
320 * Make a guess at the upper limit on the substituted string size
321 * based on the number of percents in the string.
322 */
323
324 for (bufSize = 1, p = format; *p != '\0'; p++) {
325 if (*p == '%') {
326 bufSize += 40;
327 } else {
328 bufSize++;
329 }
330 }
331 Tcl_DStringInit(&buffer);
332 Tcl_DStringSetLength(&buffer, bufSize);
333
334 Tcl_MutexLock(&clockMutex);
335 result = TclpStrftime(buffer.string, (unsigned int) bufSize, format,
336 timeDataPtr);
337 Tcl_MutexUnlock(&clockMutex);
338
339 #ifndef HAVE_TM_ZONE
340 if (useGMT) {
341 if (savedTZEnv != NULL) {
342 Tcl_SetVar2(interp, "env", "TZ", savedTZEnv, TCL_GLOBAL_ONLY);
343 ckfree(savedTZEnv);
344 } else {
345 Tcl_UnsetVar2(interp, "env", "TZ", TCL_GLOBAL_ONLY);
346 }
347 timezone = savedTimeZone;
348 tzset();
349 }
350 #endif
351
352 if (result == 0) {
353 /*
354 * A zero return is the error case (can also mean the strftime
355 * didn't get enough space to write into). We know it doesn't
356 * mean that we wrote zero chars because the check for an empty
357 * format string is above.
358 */
359 Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
360 "bad format string \"", format, "\"", (char *) NULL);
361 return TCL_ERROR;
362 }
363
364 Tcl_SetStringObj(Tcl_GetObjResult(interp), buffer.string, -1);
365 Tcl_DStringFree(&buffer);
366 return TCL_OK;
367 }
368
369 /* End of tclclock.c */

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