Use strlcpy(3) instead of strcpy(3) to copy optarg into a fixed-size buffer.

MFC after:	2 weeks

usr.bin/colldef/parse.y

@@ -242,7 +242,7 @@ main(ac, av)
 			break;
 
 		  case 'I':
-			strcpy(map_name, optarg);
+			strlcpy(map_name, optarg, sizeof(map_name));
 			break;
 
 		  default:

usr.bin/telnet/main.c

@@ -251,8 +251,8 @@ main(argc, argv)
 			break;
 		case 't':
 #if defined(TN3270) && defined(unix)
+			(void)strlcpy(tline, optarg, sizeof(tline));
 			transcom = tline;
-			(void)strcpy(transcom, optarg);
 #else
 			fprintf(stderr,
 			   "%s: Warning: -t ignored, no TN3270 support.\n",

usr.sbin/i4b/isdnd/main.c

@@ -168,7 +168,7 @@ main(int argc, char **argv)
 				break;
 
 			case 'L':
-				strcpy(logfile, optarg);
+				strlcpy(logfile, optarg, sizeof(logfile));
 				break;
 
 			case 'P':