From d1b1eb61ee0797c47516c143c37e76b3dc676a1d Mon Sep 17 00:00:00 2001
From: sebres <sebres@users.sourceforge.net>
Date: Tue, 29 May 2018 17:20:36 +0000
Subject: try to re-implement validation rules for `clock scan` (option `-valid
 1|0`), see http://core.tcl.tk/tcl/tktview?name=3475995

---
 generic/tclClock.c | 51 +++++++++++++++++++++++++++++++++++++++++++++------
 generic/tclDate.h  |  4 ++++
 tests/clock.test   |  2 +-
 3 files changed, 50 insertions(+), 7 deletions(-)

diff --git a/generic/tclClock.c b/generic/tclClock.c
index 2e74735..0074de1 100644
--- a/generic/tclClock.c
+++ b/generic/tclClock.c
@@ -261,6 +261,8 @@ TclClockInit(
     data->utc2local.tzName = NULL;
     data->local2utc.timezoneObj = NULL;
 
+    data->defFlags = 0;
+
     /*
      * Install the commands.
      */
@@ -974,12 +976,14 @@ ClockConfigureObjCmd(
 	"-system-tz",	  "-setup-tz",	  "-default-locale",	"-current-locale",
 	"-clear",
 	"-year-century",  "-century-switch",
+	"-validate",
 	NULL
     };
     enum optionInd {
 	CLOCK_SYSTEM_TZ,  CLOCK_SETUP_TZ, CLOCK_DEFAULT_LOCALE, CLOCK_CURRENT_LOCALE,
 	CLOCK_CLEAR_CACHE,
-	CLOCK_YEAR_CENTURY, CLOCK_CENTURY_SWITCH
+	CLOCK_YEAR_CENTURY, CLOCK_CENTURY_SWITCH,
+	CLOCK_VALIDATE
     };
     int optionIndex;		/* Index of an option. */
     int i;
@@ -1078,6 +1082,23 @@ ClockConfigureObjCmd(
 		    Tcl_NewIntObj(dataPtr->yearOfCenturySwitch));
 	    }
 	break;
+	case CLOCK_VALIDATE:
+	    if (i < objc) {
+		int val;
+		if (Tcl_GetBooleanFromObj(interp, objv[i], &val) != TCL_OK) {
+		    return TCL_ERROR;
+		}
+		if (val) {
+		    dataPtr->defFlags |= CLF_VALIDATE;
+		} else {
+		    dataPtr->defFlags &= ~CLF_VALIDATE;
+		}
+	    }
+	    if (i+1 >= objc) {
+		Tcl_SetObjResult(interp,
+		    Tcl_NewIntObj(dataPtr->defFlags & CLF_VALIDATE ? 1 : 0));
+	    }
+	break;
 	case CLOCK_CLEAR_CACHE:
 	    ClockConfigureClear(dataPtr);
 	break;
@@ -3208,19 +3229,22 @@ ClockParseFmtScnArgs(
     ClockClientData *dataPtr = opts->clientData;
     int gmtFlag = 0;
     static const char *const options[] = {
-	"-base", "-format", "-gmt", "-locale", "-timezone", NULL
+	"-base", "-format", "-gmt", "-locale", "-timezone", "-validate", NULL
     };
     enum optionInd {
 	CLC_ARGS_BASE, CLC_ARGS_FORMAT, CLC_ARGS_GMT, CLC_ARGS_LOCALE,
-	CLC_ARGS_TIMEZONE,
+	CLC_ARGS_TIMEZONE, CLC_ARGS_VALIDATE
     };
     int optionIndex;		/* Index of an option. */
     int saw = 0;		/* Flag == 1 if option was seen already. */
     int i;
     Tcl_WideInt baseVal;	/* Base time, expressed in seconds from the Epoch */
 
-    /* clock value (as current base) */
-    if ( !(flags & (CLC_SCN_ARGS)) ) {
+    if ( flags & (CLC_SCN_ARGS) ) {
+    	/* default flags (from configure) */
+    	opts->flags |= dataPtr->defFlags & (CLF_VALIDATE);
+    } else {
+    	/* clock value (as current base) */
 	opts->baseObj = objv[1];
 	saw |= (1 << CLC_ARGS_BASE);
     }
@@ -3275,6 +3299,21 @@ ClockParseFmtScnArgs(
 	case CLC_ARGS_BASE:
 	    opts->baseObj = objv[i+1];
 	    break;
+	case CLC_ARGS_VALIDATE:
+	    if ( !(flags & CLC_SCN_ARGS) ) {
+		goto badOptionMsg;
+	    } else {
+		int val;
+		if (Tcl_GetBooleanFromObj(interp, objv[i+1], &val) != TCL_OK) {
+		    return TCL_ERROR;
+		}
+		if (val) {
+		    opts->flags |= CLF_VALIDATE;
+		} else {
+		    opts->flags &= ~CLF_VALIDATE;
+		}
+	    }
+	    break;
 	}
 	saw |= (1 << optionIndex);
     }
@@ -3510,7 +3549,7 @@ ClockScanObjCmd(
 	    "?-base seconds? "
 	    "?-format string? "
 	    "?-gmt boolean? "
-	    "?-locale LOCALE? ?-timezone ZONE?";
+	    "?-locale LOCALE? ?-timezone ZONE? ?-validate boolean?";
     int ret;
     ClockFmtScnCmdArgs opts;	/* Format, locale, timezone and base */
     DateInfo	    yy;		/* Common structure used for parsing */
diff --git a/generic/tclDate.h b/generic/tclDate.h
index c52dd0a..a88639d 100644
--- a/generic/tclDate.h
+++ b/generic/tclDate.h
@@ -253,6 +253,7 @@ ClockInitDateInfo(DateInfo *info) {
  * Structure containing the command arguments supplied to [clock format] and [clock scan]
  */
 
+#define CLF_VALIDATE	(1 << 2)
 #define CLF_EXTENDED	(1 << 4)
 #define CLF_STRICT	(1 << 8)
 #define CLF_LOCALE_USED (1 << 15)
@@ -338,6 +339,9 @@ typedef struct ClockClientData {
 	/* values */
 	int	    tzOffset;
     } local2utc;
+
+    int defFlags;		    /* Default flags (from configure), ATM
+				     * only CLF_VALIDATE supported */
 } ClockClientData;
 
 #define ClockDefaultYearCentury 2000
diff --git a/tests/clock.test b/tests/clock.test
index 2d39c1e..5cced17 100644
--- a/tests/clock.test
+++ b/tests/clock.test
@@ -35827,7 +35827,7 @@ test clock-33.11a {clock test, millis align with micros} {
 } {1}
 
 # clock scan
-set syntax "clock scan string ?-base seconds? ?-format string? ?-gmt boolean? ?-locale LOCALE? ?-timezone ZONE?"
+set syntax "clock scan string ?-base seconds? ?-format string? ?-gmt boolean? ?-locale LOCALE? ?-timezone ZONE? ?-validate boolean?"
 test clock-34.1 {clock scan tests} {
     list [catch {clock scan} msg] $msg
 } [subst {1 {wrong # args: should be "$syntax"}}]
-- 
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