LibLine: Change get_line to return a Result<String, Error>

This fixes a bunch of FIXME's in LibLine.
Also handles the case where read() would read zero bytes in vt_dsr() and
effectively block forever by erroring out.

Fixes #2370

1 files changed, 6 insertions, 1 deletions

diff --git a/Userland/test-crypto.cpp b/Userland/test-crypto.cpp
index 4f22de89c1..a209f473cd 100644
--- a/Userland/test-crypto.cpp
+++ b/Userland/test-crypto.cpp
@@ -113,7 +113,12 @@ int run(Function<void(const char*, size_t)> fn)
         Line::Editor editor;
         editor.initialize();
         for (;;) {
-            auto line = editor.get_line("> ");
+            auto line_result = editor.get_line("> ");
+
+            if (line_result.is_error())
+                break;
+            auto& line = line_result.value();
+
             if (line == ".wait") {
                 loop.exec();
             } else {