tree-wide: introduce strerror_safe()

src/libsystemd/sd-bus/bus-error.c

@@ -577,7 +577,7 @@ const char *bus_error_message(const sd_bus_error *e, int error) {
         if (error < 0)
                 error = -error;
 
-        return strerror(error);
+        return strerror_safe(error);
 }
 
 static bool map_ok(const sd_bus_error_map *map) {

src/libsystemd/sd-bus/test-bus-chat.c

@@ -12,6 +12,7 @@
 #include "bus-internal.h"
 #include "bus-match.h"
 #include "bus-util.h"
+#include "errno-util.h"
 #include "fd-util.h"
 #include "format-util.h"
 #include "log.h"
@@ -308,7 +309,7 @@ static void* client1(void *p) {
 
         errno = 0;
         if (read(pp[0], &x, 1) <= 0) {
-                log_error("Failed to read from pipe: %s", errno ? strerror(errno) : "early read");
+                log_error("Failed to read from pipe: %s", errno != 0 ? strerror_safe(errno) : "early read");
                 goto finish;
         }
 

src/libsystemd/sd-bus/test-bus-error.c

@@ -6,6 +6,7 @@
 #include "bus-error.h"
 #include "bus-util.h"
 #include "errno-list.h"
+#include "errno-util.h"
 
 static void test_error(void) {
         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL, second = SD_BUS_ERROR_NULL;
@@ -88,7 +89,7 @@ static void test_error(void) {
         assert_se(!sd_bus_error_is_set(&error));
         assert_se(sd_bus_error_set_errno(&error, EBUSY) == -EBUSY);
         assert_se(streq(error.name, "System.Error.EBUSY"));
-        assert_se(streq(error.message, strerror(EBUSY)));
+        assert_se(streq(error.message, strerror_safe(EBUSY)));
         assert_se(sd_bus_error_has_name(&error, "System.Error.EBUSY"));
         assert_se(sd_bus_error_get_errno(&error) == EBUSY);
         assert_se(sd_bus_error_is_set(&error));