Increase the allowable node name length from 24 to 256.

Enable safe copying, no user induced buffer overflow.

src/include/ngspice/swec.h

@@ -184,7 +184,7 @@ typedef struct linked_lists_of_Bpoint{
 } BPOINT, *BPOINTPTR;
 
 typedef struct linked_lists_of_nodeName{
-   char      id[24]; 
+   char      id[256];
    struct    linked_lists_of_nodeName  *left, *right;
    NODE      *nd;
 }  NDname, *NDnamePt;

src/spicelib/devices/cpl/cplsetup.c

@@ -1934,7 +1934,8 @@ insert_ND(char* name, NDnamePt* ndn)
 		memsaved(p);
 		p->nd = NULL;
 		p->right = p->left = NULL;
-		strcpy(p->id, name);
+		strncpy(p->id, name, 255);
+		p->id[255] = '\0';
 		return(p);
 	}
 	cmp = strcmp((*ndn)->id, name);

src/spicelib/devices/txl/txlsetup.c

@@ -1035,7 +1035,8 @@ insert_ND(char *name, NDnamePt *ndn)
       p = *ndn = TMALLOC(NDname, 1);
       p->nd = NULL;
       p->right = p->left = NULL;
-      strcpy(p->id, name);
+      strncpy(p->id, name, 255);
+      p->id[255] = '\0';
       return(p);
    }
    cmp = strcmp((*ndn)->id, name);