Extended the method of the previous commit to include the command

option "drc find <text>", to find the next error of a specific
type based on the contents of the DRC error message (e.g.,
"drc find li.1").

commands/CmdCD.c

@@ -3935,8 +3935,10 @@ CmdDrc(w, cmd)
     bool	incremental;
     bool	doforall = FALSE;
     bool	dolist = FALSE;
+    bool	findonly;
     int		drc_start;
     int		count_total;
+    LinkedIndex *DRCSaveRules = NULL;
     DRCCountList *dcl;
     int argc = cmd->tx_argc;
     char **argv = cmd->tx_argv;
@@ -4165,7 +4167,8 @@ CmdDrc(w, cmd)
 	    rootDef = rootUse->cu_def;
 
 	    incremental = FALSE;
-	    if (argc == 3 && StrIsInt(argv[2]))
+	    findonly = FALSE;
+	    if ((argc == 3) && StrIsInt(argv[2]))
 	    {
 		drc_nth = atoi(argv[2]);
 		if (drc_nth <= 0) drc_nth = 1;
@@ -4174,6 +4177,30 @@ CmdDrc(w, cmd)
 	    {
 	        incremental = TRUE;
 		drc_nth++;
+
+		/* If 3rd argument is a string, then look only for
+		 * rules containing the string text.
+		 */
+		if (argc == 3)
+		{
+		    int i;
+
+		    findonly = TRUE;
+		    DRCSaveRules = DRCIgnoreRules;
+		    DRCIgnoreRules = NULL;
+		    for (i = 1; i < DRCCurStyle->DRCWhySize; i++)
+		    {
+	 		if (strstr(DRCCurStyle->DRCWhyList[i], argv[2]) != NULL)
+			{
+			    LinkedIndex *newli;
+
+			    newli = (LinkedIndex *)mallocMagic(sizeof(LinkedIndex));
+			    newli->li_index = i;
+			    newli->li_next = DRCIgnoreRules;
+			    DRCIgnoreRules = newli;
+			}
+		    }
+		}
 	    }
 
 	    drc_start = -1;
@@ -4207,7 +4234,7 @@ CmdDrc(w, cmd)
 		    if (!dolist)
 #endif
 		    TxPrintf("Error area #%d:\n", result);
-		    if (DRCWhy(dolist, rootUse, &area)) break;
+		    if (DRCWhy(dolist, rootUse, &area, findonly)) break;
 		    drc_nth++;
 		}
 		else if (result < 0)
@@ -4232,6 +4259,17 @@ CmdDrc(w, cmd)
 		if (drc_start < 0)
 		    drc_start = result;
 	    }
+	    if (findonly)
+	    {
+		/* Delete temporary rules */
+		while (DRCIgnoreRules != NULL)
+		{
+		    freeMagic(DRCIgnoreRules);
+		    DRCIgnoreRules = DRCIgnoreRules->li_next;
+		}
+		/* Replace temporary set of rules */
+		DRCIgnoreRules = DRCSaveRules;
+	    }
 	    break;
 
 	case DRC_HALO:
@@ -4309,14 +4347,11 @@ CmdDrc(w, cmd)
 	    if (argc != 3) goto badusage;
 	    if (!strcasecmp(argv[2], "none"))
 	    {
-		LinkedIndex *li;
+		while (DRCIgnoreRules != NULL)
-		li = DRCIgnoreRules;
-		while (li != NULL)
 		{
-		    freeMagic(li);
+		    freeMagic(DRCIgnoreRules);
-		    li = li->li_next;
+		    DRCIgnoreRules = DRCIgnoreRules->li_next;
 		}
-		DRCIgnoreRules = (LinkedIndex *)NULL;
 	    }
 	    else
 	    {
@@ -4422,7 +4457,7 @@ CmdDrc(w, cmd)
 	       DRCWhyAll(rootUse, &rootArea, NULL);
 	    else
 #endif
-	    if (!DRCWhy(dolist, rootUse, &rootArea))
+	    if (!DRCWhy(dolist, rootUse, &rootArea, FALSE))
 		TxPrintf("No errors found.\n");
 	    break;
     }

doc/html/drc.html

@@ -37,8 +37,10 @@ Background design rule checker control and status.
 	   <DD> Count and report error tiles in the edit cell.
 	   <DT> <B>euclidean on</B>|<B>off</B>
 	   <DD> Enable/disable Euclidean geometry checking
-	   <DT> <B>find</B> [<I>nth</I>]
+	   <DT> <B>find</B> [<I>nth</I>|<I>text</I>]
-	   <DD> Locate next (or <I>nth</I>) error in current cell
+	   <DD> Locate next (or <I>nth</I>) error in current cell;  if string
+		<I>text</I> is given instead of an integer, then search for the
+		next error of a type containing the text.
 	   <DT> <B>help</B>
 	   <DD> Print help information
 	   <DT> <B>ignore</B> [<I>text</I>|<B>none</B>]

drc/DRCmain.c

@@ -470,7 +470,7 @@ DRCPrintStats()
  */
 
 bool
-DRCWhy(dolist, use, area)
+DRCWhy(dolist, use, area, findonly)
     bool dolist;			/*
 					 * Generate Tcl list for value
 					 */
@@ -480,6 +480,11 @@ DRCWhy(dolist, use, area)
     Rect *area;				/* Area, in def's coordinates, that
 					 * is to be checked.
 					 */
+    bool findonly;			/* If TRUE, contents of DRCIgnoreRules
+					 * are inverted; that is, flag only
+					 * the marked rules instead of ignoring
+					 * them.
+					 */
 {
     SearchContext scx;
     Rect box;
@@ -490,13 +495,26 @@ DRCWhy(dolist, use, area)
     /* Create a hash table to eliminate duplicate messages. */
 
     DRCErrorList = (int *)mallocMagic((DRCCurStyle->DRCWhySize + 1) * sizeof(int));
-    for (i = 0; i <= DRCCurStyle->DRCWhySize; i++)
-	DRCErrorList[i] = 0;
 
-    /* Ignore rules as specified by setting the DRCErrorList entry to	*/
+    if (!findonly)
-    /* -1, indicating that the error type should be ignored.		*/
+    {
-    for (li = DRCIgnoreRules; li; li = li->li_next)
+	for (i = 0; i <= DRCCurStyle->DRCWhySize; i++)
-	DRCErrorList[li->li_index] = -1;
+	    DRCErrorList[i] = 0;
+
+	/* Ignore rules as specified by setting the DRCErrorList entry to	*/
+	/* -1, indicating that the error type should be ignored.		*/
+	for (li = DRCIgnoreRules; li; li = li->li_next)
+	    DRCErrorList[li->li_index] = -1;
+    }
+    else
+    {
+	/* Inverted behavior: Only look at rules in the DRCIgnoreRules list */
+	for (i = 0; i <= DRCCurStyle->DRCWhySize; i++)
+	    DRCErrorList[i] = -1;
+
+	for (li = DRCIgnoreRules; li; li = li->li_next)
+	    DRCErrorList[li->li_index] = 0;
+    }
 
     DRCErrorCount = 0;
     box = DRCdef->cd_bbox;