Corrected an error that allows a variable to be used uninitialized

in parallel_sort, resulting in a (potentially intermittant)
segfault condition.

base/netcmp.c

@@ -3860,6 +3860,7 @@ void parallel_sort(struct objlist *ob1, struct nlist *tp1, int idx1, int run)
    cval = 0.0;
    for (i = 0; i < run; i++) {
       merge_type = MERGE_NONE;
+      ml = NULL;
       for (p = 0;; p++) {
 	 vl = &(obp->instance.props[p]);
 	 if (vl->type == PROP_ENDLIST) break;
@@ -3888,11 +3889,11 @@ void parallel_sort(struct objlist *ob1, struct nlist *tp1, int idx1, int run)
       }
       if (merge_type == MERGE_P_ADD) {
 	 proplist[i].value = cval * (double)mval;
-	 ml->value.ival = 1;
+	 if (ml) ml->value.ival = 1;
       }
       else if (merge_type == MERGE_P_PAR) {
 	 proplist[i].value = cval / (double)mval;
-	 ml->value.ival = 1;
+	 if (ml) ml->value.ival = 1;
       }
       proplist[i].idx = i;
       proplist[i].ob = obp;
@@ -3904,6 +3905,7 @@ void parallel_sort(struct objlist *ob1, struct nlist *tp1, int idx1, int run)
       /* and recalculate all the proplist values.				*/
       mval = 1;
       obp = obn;
+      ml = NULL;
       merge_type = MERGE_NONE;
       for (i = 0; i < run; i++) {
          for (p = 0;; p++) {
@@ -3935,11 +3937,11 @@ void parallel_sort(struct objlist *ob1, struct nlist *tp1, int idx1, int run)
          }
          if (merge_type == MERGE_P_ADD) {
 	    proplist[i].value = cval * (double)mval;
-            ml->value.ival = 1;
+            if (ml) ml->value.ival = 1;
 	 }
 	 else if (merge_type == MERGE_P_PAR) {
 	    proplist[i].value = cval / (double)mval;
-            ml->value.ival = 1;
+            if (ml) ml->value.ival = 1;
 	 }
          obp = obp->next;
       }

base/netfile.c

@@ -210,6 +210,7 @@ struct hashdict *definitions = (struct hashdict *)NULL;
 /*----------------------------------------------------------------------*/
 /* TrimQuoted() ---							*/
 /* Remove spaces from inside single- or double-quoted strings.		*/
+/* Ignore verilog constant bits (e.g., "1'b0") when parsing.		*/
 /*----------------------------------------------------------------------*/
 
 void TrimQuoted(char *line)
@@ -225,6 +226,13 @@ void TrimQuoted(char *line)
     {
 	changed = FALSE;
 	qstart = strchr(lptr, '\'');
+	if (qstart && (qstart > lptr)) {
+	    if (isdigit(*(qstart - 1))) {
+		lptr = qstart + 1;
+		changed = TRUE;
+		continue;
+	    }
+	}
 	if (qstart)
 	{
 	    qend = strchr(qstart + 1, '\'');

base/verilog.c

@@ -634,7 +634,7 @@ void ReadVerilogFile(char *fname, int filenum, struct cellstack **CellStackPtr,
 	char *paramval = NULL;
 
 	// Pick up key = value pairs and store in current cell.  Look only
-	// at the keyword before "=".  Then set the defition as everything
+	// at the keyword before "=".  Then set the definition as everything
 	// remaining in the line, excluding comments, until the end-of-statement
 
 	while (nexttok != NULL)