Improve ssh_options_get(ssh_session, enum ssh_options_e, char**).

* Use SSH_ERROR and SSH_OK instead of `-1` and `0`.
 * Re-factor for code duplication
 * No longer call `ssh_set_error_invalid(ssh_session)` when the
   ssh_session is NULL.

src/options.c

@@ -838,57 +838,42 @@ int ssh_options_get_port(ssh_session session, unsigned int* port_target) {
  *               your responsibility to free the memory using
  *               ssh_free().
  *
- * @return       0 on success, < 0 on error.
+ * @return       SSH_OK on success, SSH_ERROR on error.
  */
 int ssh_options_get(ssh_session session, enum ssh_options_e type, char** value)
 {
+    char* src = NULL;
     if (session == NULL) {
-        return -1;
+        return SSH_ERROR;
     }
     switch(type)
     {
         case SSH_OPTIONS_HOST: {
-            if (session->host == NULL) {
-                ssh_set_error_invalid(session);
-                return -1;
-            }
-            *value = strdup(session->host);
-            if (*value == NULL) {
-                ssh_set_error_oom(session);
-                return -1;
-            }
+            src = session->host;
             break;
         }
         case SSH_OPTIONS_USER: {
-            if (session->username == NULL) {
-                ssh_set_error_invalid(session);
-                return -1;
-            }
-            *value = strdup(session->username);
-            if (*value == NULL) {
-                ssh_set_error_oom(session);
-                return -1;
-            }
+            src = session->username;
             break;
         }
         case SSH_OPTIONS_IDENTITY: {
-            if (session->identity == NULL) {
-                ssh_set_error_invalid(session);
-                return -1;
-            }
-            *value = strdup(session->identity->root->data);
-            if(*value == NULL){
-                ssh_set_error_oom(session);
-                return -1;
-            }
+            src = ssh_iterator_value(char *, ssh_list_get_iterator(session->identity));
             break;
         }
         default:
             ssh_set_error(session, SSH_REQUEST_DENIED, "Unknown ssh option %d", type);
-            return -1;
+            return SSH_ERROR;
         break;
     }
-    return 0;
+    if (src == NULL) {
+        return SSH_ERROR;
+    }
+    *value = strdup(src);
+    if (*value == NULL) {
+        ssh_set_error_oom(session);
+        return SSH_ERROR;
+    }
+    return SSH_OK;
 }
 
 /**

tests/unittests/torture_options.c

@@ -83,7 +83,7 @@ static void torture_options_get_user(void **state) {
   char* user = NULL;
   int rc;
   rc = ssh_options_set(session, SSH_OPTIONS_USER, "magicaltrevor");
-  assert_true(rc == 0);
+  assert_true(rc == SSH_OK);
   rc = ssh_options_get(session, SSH_OPTIONS_USER, &user);
   assert_string_equal(user, "magicaltrevor");
 }
@@ -98,7 +98,7 @@ static void torture_options_set_fd(void **state) {
     assert_true(session->fd == fd);
 
     rc = ssh_options_set(session, SSH_OPTIONS_FD, NULL);
-    assert_true(rc == -1);
+    assert_true(rc == SSH_ERROR);
     assert_true(session->fd == SSH_INVALID_SOCKET);
 }
 
@@ -161,14 +161,14 @@ static void torture_options_get_identity(void **state) {
     rc = ssh_options_set(session, SSH_OPTIONS_ADD_IDENTITY, "identity1");
     assert_true(rc == 0);
     rc = ssh_options_get(session, SSH_OPTIONS_IDENTITY, &identity);
-    assert_true(rc == 0);
+    assert_true(rc == SSH_OK);
     assert_string_equal(identity, "identity1");
 
     rc = ssh_options_set(session, SSH_OPTIONS_IDENTITY, "identity2");
     assert_true(rc == 0);
     assert_string_equal(session->identity->root->data, "identity2");
     rc = ssh_options_get(session, SSH_OPTIONS_IDENTITY, &identity);
-    assert_true(rc == 0);
+    assert_true(rc == SSH_OK);
     assert_string_equal(identity, "identity2");
 }