Fix: tests: replace truncation-prone logging helper

The printerr() error logging scheme in test_utils_expand_path
is prone to unexpected truncations which results in a lot of
warnings when building using GCC 9.2.

It is replaced by a variable-argument macro that uses fprintf()
directly.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/tests/unit/test_utils_expand_path.c b/tests/unit/test_utils_expand_path.c
index d047c207dac0885afcbc0d9544bfbd1dd4c7b798..d72196404e1115f7c38cbd4b43ab394dbfe86480 100644 (file)
--- a/tests/unit/test_utils_expand_path.c
+++ b/tests/unit/test_utils_expand_path.c
@@ -120,12 +120,8 @@ static char *invalid_tests_inputs[] = {
 static const int num_invalid_tests =
                sizeof(invalid_tests_inputs) / sizeof(invalid_tests_inputs[0]);
 
-#define ERRSIZE 100
-char errmsg[ERRSIZE];
-static void printerr(char *msg)
-{
-       fprintf(stderr, "test_utils_expand_path: error: %s\n", msg);
-}
+#define PRINT_ERR(fmt, args...)                                                \
+       fprintf(stderr, "test_utils_expand_path: error: " fmt "\n", ## args)
 
 int prepare_valid_results(void)
 {
@@ -140,7 +136,7 @@ int prepare_valid_results(void)
        pprev_path = realpath("../..", NULL);
        empty = strdup("");
        if (!cur_path || !prev_path || !pprev_path || !empty) {
-               printerr("strdup out of memory");
+               PRINT_ERR("strdup out of memory");
                ret = -1;
                goto end;
        }
@@ -148,14 +144,14 @@ int prepare_valid_results(void)
        /* allocate memory for the expected results */
        valid_tests_expected_results = zmalloc(sizeof(char *) * num_valid_tests);
        if (!valid_tests_expected_results) {
-               printerr("out of memory");
+               PRINT_ERR("out of memory");
                ret = -1;
                goto end;
        }
        for (i = 0; i < num_valid_tests; i++) {
                valid_tests_expected_results[i] = malloc(PATH_MAX);
                if (valid_tests_expected_results[i] == NULL) {
-                       printerr("malloc expected results");
+                       PRINT_ERR("malloc expected results");
                        ret = -1;
                        goto end;
                }
@@ -199,34 +195,33 @@ int free_valid_results(void)
 int prepare_symlink_tree(void)
 {
        int i;
-       char tmppath[PATH_MAX];
+       char tmppath[PATH_MAX] = {};
 
        /* Create the temporary directory */
        if (mkdtemp(tree_origin) == NULL) {
-               printerr("mkdtemp");
+               PRINT_ERR("failed to mkdtemp");
                goto error;
        }
 
        /* Create the directories of the test tree */
        for (i = 0; i < num_tree_dirs; i++) {
-               snprintf(tmppath, PATH_MAX, "%s/%s", tree_origin, tree_dirs[i]);
+               snprintf(tmppath, sizeof(tmppath), "%s/%s", tree_origin,
+                               tree_dirs[i]);
 
                if (mkdir(tmppath, 0755) != 0) {
-                       snprintf(errmsg, ERRSIZE, "mkdir %s", tmppath);
-                       printerr(errmsg);
+                       PRINT_ERR("mkdir failed with path \"%s\"", tmppath);
                        goto error;
                }
        }
 
        /* Create the symlinks of the test tree */
        for (i = 0; i < num_tree_symlinks; i++) {
-               snprintf(tmppath, PATH_MAX, "%s/%s",
+               snprintf(tmppath, sizeof(tmppath), "%s/%s",
                                tree_origin, tree_symlinks[i].orig);
 
                if (symlink(tree_symlinks[i].dest, tmppath) != 0) {
-                       snprintf(errmsg, ERRSIZE, "symlink %s to %s",
-                                       tmppath, tree_symlinks[i].dest);
-                       printerr(errmsg);
+                       PRINT_ERR("failed to symlink \"%s\" to \"%s\"", tmppath,
+                                       tree_symlinks[i].dest);
                        goto error;
                }
        }
@@ -248,8 +243,7 @@ int free_symlink_tree(void)
                                tree_origin, tree_symlinks[i].orig);
 
                if (unlink(tmppath) != 0) {
-                       snprintf(errmsg, ERRSIZE, "unlink %s", tmppath);
-                       printerr(errmsg);
+                       PRINT_ERR("failed to unlink \"%s\"", tmppath);
                        goto error;
                }
        }
@@ -259,16 +253,14 @@ int free_symlink_tree(void)
                snprintf(tmppath, PATH_MAX, "%s/%s", tree_origin, tree_dirs[i]);
 
                if (rmdir(tmppath) != 0) {
-                       snprintf(errmsg, ERRSIZE, "rmdir %s", tmppath);
-                       printerr(errmsg);
+                       PRINT_ERR("failed to rmdir \"%s\"", tmppath);
                        goto error;
                }
        }
 
        /* Remove the temporary directory */
        if (rmdir(tree_origin) != 0) {
-               snprintf(errmsg, ERRSIZE, "rmdir %s", tree_origin);
-               printerr(errmsg);
+               PRINT_ERR("failed to rmdir \"%s\"", tree_origin);
                goto error;
        }
 
@@ -308,11 +300,21 @@ static void test_utils_expand_path(void)
        /* Test symlink tree cases */
        treelen = strlen(real_tree_origin) + 1;
        for (i = 0; i < num_symlink_tests; i++) {
+               int ret;
+
                sprintf(name, "symlink tree test case: [tmppath/]%s",
                                symlink_tests_inputs[i].input);
 
-               snprintf(tmppath, PATH_MAX, "%s/%s",
-                               real_tree_origin, symlink_tests_inputs[i].input);
+               ret = snprintf(tmppath, PATH_MAX, "%s/%s",
+                               real_tree_origin,
+                               symlink_tests_inputs[i].input);
+               if (ret == -1 || ret >= PATH_MAX) {
+                       PRINT_ERR("truncation occurred while concatenating paths \"%s\" and \"%s\"",
+                                       real_tree_origin,
+                                       symlink_tests_inputs[i].input);
+                       fail(name);
+                       continue;
+               }
                result = utils_expand_path(tmppath);
                ok(result != NULL && strcmp(result + treelen,
                                        symlink_tests_inputs[i].expected_result) == 0, name);