From 4c0e0d0f7efc6df99e44fa395c0ac39e2c1ad2b4 Mon Sep 17 00:00:00 2001
From: Stas Sergeev <stsp@users.sourceforge.net>
Date: Sun, 7 Jul 2024 11:43:55 +0300
Subject: [PATCH] check ret value of getcwd()

This fixes prompt on invalid drive.
See https://github.com/dosemu2/dosemu2/issues/2225
---
 src/command.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/command.c b/src/command.c
index 645ccbe..0e3897e 100644
--- a/src/command.c
+++ b/src/command.c
@@ -395,6 +395,7 @@ static void output_prompt(void)
   {
   char cur_drive_and_path[MAXPATH];
   const char *promptvar = getenv("PROMPT");
+  char *cwd;
 
   if (need_to_crlf_at_next_prompt)
     {
@@ -405,7 +406,9 @@ static void output_prompt(void)
 
   if (promptvar == NULL)
     promptvar = "$p$g";
-  getcwd(cur_drive_and_path, MAXPATH);
+  cwd = getcwd(cur_drive_and_path, MAXPATH);
+  if (!cwd)
+    strcpy(cur_drive_and_path, "invalid");
   /* The disk letter is changed to upper-case */
   cur_drive_and_path[0] = toupper(cur_drive_and_path[0]);
   conv_unix_path_to_ms_dos(cur_drive_and_path);