misc: Add a function to encode newlines

Given a string, the added function encodes existing newline characters
('\n') as the string "\\n" and puts into a given output buffer.

The output buffer must have at least 2 times the length of the input
string plus 1 for the terminating '\0'. In the worst case, each
character can be replaced by 2 characters.

Fixes T189

Signed-off-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Jakub Jelen <jjelen@redhat.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/unittests/torture_misc.c b/tests/unittests/torture_misc.c
index eff93532..ef06d65f 100644
--- a/tests/unittests/torture_misc.c
+++ b/tests/unittests/torture_misc.c
@@ -637,6 +637,24 @@ static void torture_ssh_quote_file_name(UNUSED_PARAM(void **state))
     assert_int_equal(rc, SSH_ERROR);
 }
 
+static void torture_ssh_newline_vis(UNUSED_PARAM(void **state))
+{
+    int rc;
+    char buffer[1024];
+
+    rc = ssh_newline_vis("\n", buffer, 1024);
+    assert_int_equal(rc, 2);
+    assert_string_equal(buffer, "\\n");
+
+    rc = ssh_newline_vis("\n\n\n\n", buffer, 1024);
+    assert_int_equal(rc, 8);
+    assert_string_equal(buffer, "\\n\\n\\n\\n");
+
+    rc = ssh_newline_vis("a\nb\n", buffer, 1024);
+    assert_int_equal(rc, 6);
+    assert_string_equal(buffer, "a\\nb\\n");
+}
+
 int torture_run_tests(void) {
     int rc;
     struct CMUnitTest tests[] = {
@@ -656,6 +674,7 @@ int torture_run_tests(void) {
         cmocka_unit_test(torture_timeout_update),
         cmocka_unit_test(torture_ssh_analyze_banner),
         cmocka_unit_test(torture_ssh_dir_writeable),
+        cmocka_unit_test(torture_ssh_newline_vis),
         cmocka_unit_test(torture_ssh_mkdirs),
         cmocka_unit_test(torture_ssh_quote_file_name),
     };