Sanitize pane titles and window and session names more consistently and

strictly, prevents C0 characters and other nonvisible characters causing
problems. Reported (with a different fix) by Chris Monardo in GitHub
issue 4999.

cmd-new-session.c

@@ -102,7 +102,7 @@ cmd_new_session_exec(struct cmd *self, struct cmdq_item *item)
 	tmp = args_get(args, 's');
 	if (tmp != NULL) {
 		name = format_single(item, tmp, c, NULL, NULL, NULL);
-		newname = session_check_name(name);
+		newname = clean_name(name, "#:.");
 		if (newname == NULL) {
 			cmdq_error(item, "invalid session: %s", name);
 			free(name);
@@ -142,7 +142,7 @@ cmd_new_session_exec(struct cmd *self, struct cmdq_item *item)
 		else if (groupwith != NULL)
 			prefix = xstrdup(groupwith->name);
 		else {
-			prefix = session_check_name(group);
+			prefix = clean_name(group, "#:.");
 			if (prefix == NULL) {
 				cmdq_error(item, "invalid session group: %s",
 				    group);

cmd-rename-session.c

@@ -52,7 +52,7 @@ cmd_rename_session_exec(struct cmd *self, struct cmdq_item *item)
 	char			*newname, *tmp;
 
 	tmp = format_single_from_target(item, args_string(args, 0));
-	newname = session_check_name(tmp);
+	newname = clean_name(tmp, "#:.");
 	if (newname == NULL) {
 		cmdq_error(item, "invalid session: %s", tmp);
 		free(tmp);

input.c

@@ -2626,13 +2626,10 @@ input_exit_osc(struct input_ctx *ictx)
 		input_osc_4(ictx, p);
 		break;
 	case 7:
-		if (utf8_isvalid(p)) {
+		if (screen_set_path(sctx->s, p) && wp != NULL) {
-			screen_set_path(sctx->s, p);
-			if (wp != NULL) {
 			server_redraw_window_borders(wp->window);
 			server_status_window(wp->window);
 		}
-		}
 		break;
 	case 8:
 		input_osc_8(ictx, p);

names.c

@@ -166,7 +166,9 @@ parse_window_name(const char *in)
 
 	if (*name == '/')
 		name = basename(name);
-	name = xstrdup(name);
+	name = clean_name(name, "#");
 	free(copy);
+	if (name == NULL)
+		return (xstrdup(""));
 	return (name);
 }

screen.c

@@ -232,19 +232,28 @@ screen_set_cursor_colour(struct screen *s, int colour)
 int
 screen_set_title(struct screen *s, const char *title)
 {
-	if (!utf8_isvalid(title))
+	char	*new_title;
+
+	new_title = clean_name(title, "#");
+	if (new_title == NULL)
 		return (0);
 	free(s->title);
-	s->title = xstrdup(title);
+	s->title = new_title;
 	return (1);
 }
 
 /* Set screen path. */
-void
+int
 screen_set_path(struct screen *s, const char *path)
 {
+	char	*new_path;
+
+	new_path = clean_name(path, "#");
+	if (new_path == NULL)
+		return (0);
 	free(s->path);
-	utf8_stravis(&s->path, path, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
+	s->path = new_path;
+	return (1);
 }
 
 /* Push the current title onto the stack. */

session.c

@@ -231,24 +231,6 @@ session_destroy(struct session *s, int notify, const char *from)
 	session_remove_ref(s, __func__);
 }
 
-/* Sanitize session name. */
-char *
-session_check_name(const char *name)
-{
-	char	*copy, *cp, *new_name;
-
-	if (*name == '\0')
-		return (NULL);
-	copy = xstrdup(name);
-	for (cp = copy; *cp != '\0'; cp++) {
-		if (*cp == ':' || *cp == '.')
-			*cp = '_';
-	}
-	utf8_stravis(&new_name, copy, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
-	free(copy);
-	return (new_name);
-}
-
 /* Lock session if it has timed out. */
 static void
 session_lock_timer(__unused int fd, __unused short events, void *arg)

spawn.c

@@ -84,6 +84,7 @@ spawn_window(struct spawn_context *sc, char **cause)
 	struct winlink		*wl;
 	int			 idx = sc->idx;
 	u_int			 sx, sy, xpixel, ypixel;
+	char			*name;
 
 	spawn_log(__func__, sc);
 
@@ -182,8 +183,11 @@ spawn_window(struct spawn_context *sc, char **cause)
 	if (~sc->flags & SPAWN_RESPAWN) {
 		free(w->name);
 		if (sc->name != NULL) {
-			w->name = format_single(item, sc->name, c, s, NULL,
+			name = format_single(item, sc->name, c, s, NULL, NULL);
-			    NULL);
+			w->name = clean_name(name, "#");
+			free(name);
+			if (w->name == NULL)
+				w->name = xstrdup("");
 			options_set_number(w->options, "automatic-rename", 0);
 		} else
 			w->name = default_window_name(w);

tmux.c

@@ -34,6 +34,7 @@
 #include <time.h>
 #include <unistd.h>
 #include <util.h>
+#include <vis.h>
 
 #include "tmux.h"
 
@@ -285,6 +286,23 @@ get_timer(void)
 	return ((ts.tv_sec * 1000ULL) + (ts.tv_nsec / 1000000ULL));
 }
 
+char *
+clean_name(const char *name, const char* forbid)
+{
+	char	*copy, *cp, *new_name;
+
+	if (*name == '\0' || !utf8_isvalid(name))
+		return (NULL);
+	copy = xstrdup(name);
+	for (cp = copy; *cp != '\0'; cp++) {
+		if (strchr(forbid, *cp) != NULL)
+			*cp = '_';
+	}
+	utf8_stravis(&new_name, copy, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
+	free(copy);
+	return (new_name);
+}
+
 const char *
 sig2name(int signo)
 {

tmux.h

@@ -2326,6 +2326,7 @@ int		 checkshell(const char *);
 void		 setblocking(int, int);
 char 		*shell_argv0(const char *, int);
 uint64_t	 get_timer(void);
+char		*clean_name(const char *, const char *);
 const char	*sig2name(int);
 const char	*find_cwd(void);
 const char	*find_home(void);
@@ -3281,7 +3282,7 @@ void	 screen_set_default_cursor(struct screen *, struct options *);
 void	 screen_set_cursor_style(u_int, enum screen_cursor_style *, int *);
 void	 screen_set_cursor_colour(struct screen *, int);
 int	 screen_set_title(struct screen *, const char *);
-void	 screen_set_path(struct screen *, const char *);
+int	 screen_set_path(struct screen *, const char *);
 void	 screen_push_title(struct screen *);
 void	 screen_pop_title(struct screen *);
 void	 screen_set_progress_bar(struct screen *, enum progress_bar_state, int);
@@ -3587,7 +3588,6 @@ struct session	*session_create(const char *, const char *, const char *,
 void		 session_destroy(struct session *, int,	 const char *);
 void		 session_add_ref(struct session *, const char *);
 void		 session_remove_ref(struct session *, const char *);
-char		*session_check_name(const char *);
 void		 session_update_activity(struct session *, struct timeval *);
 struct session	*session_next_session(struct session *, struct sort_criteria *);
 struct session	*session_previous_session(struct session *,

window.c

@@ -408,10 +408,15 @@ window_remove_ref(struct window *w, const char *from)
 void
 window_set_name(struct window *w, const char *new_name)
 {
+	char	*name;
+
+	name = clean_name(new_name, "#");
+	if (name != NULL) {
 		free(w->name);
 		utf8_stravis(&w->name, new_name, VIS_OCTAL|VIS_CSTYLE|VIS_TAB|VIS_NL);
 		notify_window("window-renamed", w);
 	}
+}
 
 void
 window_resize(struct window *w, u_int sx, u_int sy, int xpixel, int ypixel)