test-copy: never call alloca() in a loop

That's a total no-no, hence rework this to use malloc()-based memory instead of
alloca()-based memory.

Also see CODING_STYLE about this.

1 files changed, 14 insertions, 8 deletions

diff --git a/src/test/test-copy.c b/src/test/test-copy.c
index d1bf376385..68154fc4e8 100644
--- a/src/test/test-copy.c
+++ b/src/test/test-copy.c
@@ -104,15 +104,19 @@ static void test_copy_tree(void) {
         (void) rm_rf(original_dir, REMOVE_ROOT|REMOVE_PHYSICAL);
 
         STRV_FOREACH(p, files) {
-                char *f = strjoina(original_dir, *p);
+                _cleanup_free_ char *f;
+
+                assert_se(f = strappend(original_dir, *p));
 
                 assert_se(mkdir_parents(f, 0755) >= 0);
                 assert_se(write_string_file(f, "file", WRITE_STRING_FILE_CREATE) == 0);
         }
 
         STRV_FOREACH_PAIR(link, p, links) {
-                char *f = strjoina(original_dir, *p);
-                char *l = strjoina(original_dir, *link);
+                _cleanup_free_ char *f, *l;
+
+                assert_se(f = strappend(original_dir, *p));
+                assert_se(l = strappend(original_dir, *link));
 
                 assert_se(mkdir_parents(l, 0755) >= 0);
                 assert_se(symlink(f, l) == 0);
@@ -124,9 +128,10 @@ static void test_copy_tree(void) {
         assert_se(copy_tree(original_dir, copy_dir, true) == 0);
 
         STRV_FOREACH(p, files) {
-                _cleanup_free_ char *buf = NULL;
+                _cleanup_free_ char *buf = NULL, *f;
                 size_t sz = 0;
-                char *f = strjoina(copy_dir, *p);
+
+                assert_se(f = strappend(copy_dir, *p));
 
                 assert_se(access(f, F_OK) == 0);
                 assert_se(read_full_file(f, &buf, &sz) == 0);
@@ -134,9 +139,10 @@ static void test_copy_tree(void) {
         }
 
         STRV_FOREACH_PAIR(link, p, links) {
-                _cleanup_free_ char *target = NULL;
-                char *f = strjoina(original_dir, *p);
-                char *l = strjoina(copy_dir, *link);
+                _cleanup_free_ char *target = NULL, *f, *l;
+
+                assert_se(f = strjoin(original_dir, *p, NULL));
+                assert_se(l = strjoin(copy_dir, *link, NULL));
 
                 assert_se(readlink_and_canonicalize(l, &target) == 0);
                 assert_se(path_equal(f, target));