tools: constify the optarg handling of seats

This shuts up scan-build complaining about memory leaks in libinput
debug-events (needs the right combination of --device option and eventually
triggering usage()) and saves us a bunch of unnecessary allocations.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

tools/libinput-debug-events.c

@@ -967,7 +967,7 @@ main(int argc, char **argv)
 {
 	struct libinput *li;
 	enum tools_backend backend = BACKEND_NONE;
-	char *seat_or_devices[60] = {NULL};
+	const char *seat_or_devices[60] = {NULL};
 	size_t ndevices = 0;
 	bool grab = false;
 	bool verbose = false;
@@ -1024,7 +1024,7 @@ main(int argc, char **argv)
 
 			}
 			backend = BACKEND_DEVICE;
-			seat_or_devices[ndevices++] = safe_strdup(optarg);
+			seat_or_devices[ndevices++] = optarg;
 			break;
 		case OPT_UDEV:
 			if (backend == BACKEND_DEVICE ||
@@ -1034,7 +1034,7 @@ main(int argc, char **argv)
 
 			}
 			backend = BACKEND_UDEV;
-			seat_or_devices[0] = safe_strdup(optarg);
+			seat_or_devices[0] = optarg;
 			ndevices = 1;
 			break;
 		case OPT_GRAB:
@@ -1064,12 +1064,11 @@ main(int argc, char **argv)
 				usage();
 				return EXIT_INVALID_USAGE;
 			}
-			seat_or_devices[ndevices++] = safe_strdup(argv[optind]);
+			seat_or_devices[ndevices++] = argv[optind];
 		} while(++optind < argc);
 	} else if (backend == BACKEND_NONE) {
 		backend = BACKEND_UDEV;
-		seat_or_devices[0] = safe_strdup("seat0");
-		ndevices = 1;
+		seat_or_devices[0] = "seat0";
 	}
 
 	memset(&act, 0, sizeof(act));
@@ -1089,9 +1088,6 @@ main(int argc, char **argv)
 	if (!li)
 		return EXIT_FAILURE;
 
-	while (ndevices-- > 0)
-		free(seat_or_devices[ndevices]);
-
 	mainloop(li);
 
 	libinput_unref(li);

tools/libinput-debug-gui.c

@@ -1521,7 +1521,7 @@ main(int argc, char **argv)
 	struct tools_options options;
 	struct libinput *li;
 	enum tools_backend backend = BACKEND_NONE;
-	char *seat_or_device[2] = {"seat0", NULL};
+	const char *seat_or_device[2] = {"seat0", NULL};
 	bool verbose = false;
 
 	if (!gtk_init_check(&argc, &argv))

tools/libinput-debug-tablet.c

@@ -511,7 +511,7 @@ main(int argc, char **argv)
 	struct context ctx;
 	struct libinput *li;
 	enum tools_backend backend = BACKEND_NONE;
-	char *seat_or_device[2] = {"seat0", NULL};
+	const char *seat_or_device[2] = {"seat0", NULL};
 	struct sigaction act;
 	bool grab = false;
 

tools/libinput-list-devices.c

@@ -376,7 +376,7 @@ main(int argc, char **argv)
 	struct libinput *li;
 	struct libinput_event *ev;
 	bool grab = false;
-	char *seat[2] = {"seat0", NULL};
+	const char *seat[2] = {"seat0", NULL};
 
 	/* This is kept for backwards-compatibility with the old
 	   libinput-list-devices */

tools/shared.c

@@ -305,11 +305,11 @@ out:
 }
 
 static struct libinput *
-tools_open_device(char **paths, bool verbose, bool *grab)
+tools_open_device(const char **paths, bool verbose, bool *grab)
 {
 	struct libinput_device *device;
 	struct libinput *li;
-	char **p = paths;
+	const char **p = paths;
 
 	li = libinput_path_create_context(&interface, grab);
 	if (!li) {
@@ -348,7 +348,7 @@ tools_setenv_quirks_dir(void)
 
 struct libinput *
 tools_open_backend(enum tools_backend which,
-		   char **seat_or_device,
+		   const char **seat_or_device,
 		   bool verbose,
 		   bool *grab)
 {

tools/shared.h

@@ -116,7 +116,7 @@ int tools_parse_option(int option,
 		       const char *optarg,
 		       struct tools_options *options);
 struct libinput* tools_open_backend(enum tools_backend which,
-				    char **seat_or_devices,
+				    const char **seat_or_devices,
 				    bool verbose,
 				    bool *grab);
 void tools_device_apply_config(struct libinput_device *device,