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ext-foreign-toplevel-list-v1: improve/fix update_state()

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This extracts common string updating logic into a function and fixes a
possible NULL dereference.
This commit is contained in:
Kirill Primak 2024-02-13 19:19:41 +03:00
parent 6ad9e89a34
commit 4c69bc47f4
1 changed files with 29 additions and 38 deletions
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67
types/wlr_ext_foreign_toplevel_list_v1.c
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@ -24,47 +24,38 @@ static const struct ext_foreign_toplevel_list_v1_interface toplevel_handle_impl
.destroy = foreign_toplevel_handle_destroy, .destroy = foreign_toplevel_handle_destroy,
}; };
// Returns true if clients need to be notified about the update
static bool update_string(struct wlr_ext_foreign_toplevel_handle_v1 *toplevel,
char **dst, const char *src) {
if (src == NULL) {
if (*dst == NULL) {
return false;
}
} else if (*dst != NULL && strcmp(*dst, src) == 0) {
return false;
}
free(*dst);
if (src != NULL) {
*dst = strdup(src);
if (*dst == NULL) {
struct wl_resource *resource;
wl_resource_for_each(resource, &toplevel->resources) {
wl_resource_post_no_memory(resource);
}
return false;
}
} else {
*dst = NULL;
}
return true;
}
void wlr_ext_foreign_toplevel_handle_v1_update_state( void wlr_ext_foreign_toplevel_handle_v1_update_state(
struct wlr_ext_foreign_toplevel_handle_v1 *toplevel, struct wlr_ext_foreign_toplevel_handle_v1 *toplevel,
const struct wlr_ext_foreign_toplevel_handle_v1_state *state) { const struct wlr_ext_foreign_toplevel_handle_v1_state *state) {
bool changed_app_id = false; bool changed_app_id = update_string(toplevel, &toplevel->app_id, state->app_id);
bool changed_title = false; bool changed_title = update_string(toplevel, &toplevel->title, state->title);
if (state->app_id) {
if (strcmp(toplevel->app_id, state->app_id) != 0) {
free(toplevel->app_id);
toplevel->app_id = strdup(state->app_id);
if (toplevel->app_id == NULL) {
wlr_log(WLR_ERROR, "failed to allocate memory for toplevel app_id");
return;
}
changed_app_id = true;
}
} else {
if (toplevel->app_id) {
free(toplevel->app_id);
toplevel->app_id = NULL;
changed_app_id = true;
}
}
if (state->title) {
if (strcmp(toplevel->title, state->title) != 0) {
free(toplevel->title);
toplevel->title = strdup(state->title);
if (toplevel->title == NULL) {
wlr_log(WLR_ERROR, "failed to allocate memory for toplevel title");
return;
}
changed_title = true;
}
} else {
if (toplevel->title) {
free(toplevel->title);
toplevel->title = NULL;
changed_title = true;
}
}
if (!changed_app_id && !changed_title) { if (!changed_app_id && !changed_title) {
return; return;