3 files changed, 19 insertions, 3 deletions

diff --git a/sway/commands/move.c b/sway/commands/move.c
index f5eb9124..33d1ee4a 100644
--- a/sway/commands/move.c
+++ b/sway/commands/move.c
@@ -1,4 +1,5 @@
 #define _XOPEN_SOURCE 500
+#include <ctype.h>
 #include <stdbool.h>
 #include <string.h>
 #include <strings.h>
@@ -124,7 +125,11 @@ static struct cmd_results *cmd_move_container(struct sway_container *current,
                                         return cmd_results_new(CMD_INVALID, "move",
                                                         expected_syntax);
                                 }
-                                ws_name = strdup(argv[3]);
+                                if (!isdigit(argv[3][0])) {
+                                        return cmd_results_new(CMD_INVALID, "move",
+                                                        "Invalid workspace number '%s'", argv[3]);
+                                }
+                                ws_name = join_args(argv + 3, argc - 3);
                                 ws = workspace_by_number(ws_name);
                         } else {
                                 ws_name = join_args(argv + 2, argc - 2);
diff --git a/sway/commands/rename.c b/sway/commands/rename.c
index c69bbdac..21d2aa64 100644
--- a/sway/commands/rename.c
+++ b/sway/commands/rename.c
@@ -1,4 +1,5 @@
 #define _XOPEN_SOURCE 500
+#include <ctype.h>
 #include <string.h>
 #include <strings.h>
 #include "log.h"
@@ -34,6 +35,10 @@ struct cmd_results *cmd_rename(int argc, char **argv) {
                 }
         } else if (strcasecmp(argv[1], "number") == 0) {
                 // 'rename workspace number x to new_name'
+                if (!isdigit(argv[2][0])) {
+                        return cmd_results_new(CMD_INVALID, "rename",
+                                        "Invalid workspace number '%s'", argv[2]);
+                }
                 workspace = workspace_by_number(argv[2]);
                 while (argn < argc && strcasecmp(argv[argn], "to") != 0) {
                         ++argn;
@@ -67,7 +72,8 @@ struct cmd_results *cmd_rename(int argc, char **argv) {
                         strcasecmp(new_name, "next_on_output") == 0 ||
                         strcasecmp(new_name, "prev_on_output") == 0 ||
                         strcasecmp(new_name, "back_and_forth") == 0 ||
-                        strcasecmp(new_name, "current") == 0) {
+                        strcasecmp(new_name, "current") == 0 ||
+                        strcasecmp(new_name, "number") == 0) {
                 free(new_name);
                 return cmd_results_new(CMD_INVALID, "rename",
                                 "Cannot use special workspace name '%s'", argv[argn]);
diff --git a/sway/commands/workspace.c b/sway/commands/workspace.c
index f5558bb4..ceb4cd6e 100644
--- a/sway/commands/workspace.c
+++ b/sway/commands/workspace.c
@@ -1,4 +1,5 @@
 #define _XOPEN_SOURCE 500
+#include <ctype.h>
 #include <string.h>
 #include <strings.h>
 #include "sway/commands.h"
@@ -60,9 +61,13 @@ struct cmd_results *cmd_workspace(int argc, char **argv) {
                 struct sway_container *ws = NULL;
                 if (strcasecmp(argv[0], "number") == 0) {
                         if (argc < 2) {
-                                cmd_results_new(CMD_INVALID, "workspace",
+                                return cmd_results_new(CMD_INVALID, "workspace",
                                                 "Expected workspace number");
                         }
+                        if (!isdigit(argv[1][0])) {
+                                return cmd_results_new(CMD_INVALID, "workspace",
+                                                "Invalid workspace number '%s'", argv[1]);
+                        }
                         if (!(ws = workspace_by_number(argv[1]))) {
                                 char *name = join_args(argv + 1, argc - 1);
                                 ws = workspace_create(NULL, name);