commit a0faec76c1ca1d5e829f04d65b45b8c9d032383a
from: Stefan Sperling <stsp@stsp.name>
date: Tue Aug 01 14:01:09 2023 UTC

important regression fix: do not truncate config files in /etc

Tom Smyth found during testing that when editing config files via the
"edit" ctl commands we would always truncate existing files in /etc.
And thus always see an empty file to load an example for.

Fix this by passing the correct mode to fopen(): a+ instead of w+

Committing right now to prevent data loss. People running nsh built
from the previous commit 574d5c2d6a16ae5600d65fedc157d03e7fcfdd43
should update.

commit - 574d5c2d6a16ae5600d65fedc157d03e7fcfdd43
commit + a0faec76c1ca1d5e829f04d65b45b8c9d032383a
blob - 1fc6dd7d7f57306bb861c4d7e29798c158b0f32b
blob + 4011e0f3cb3a14e6359f82f82497db29b47dcd89
--- ctl.c
+++ ctl.c
@@ -832,7 +832,7 @@ provide_example_config(char *filename)
 
 	memset(tmpprompt, 0, sizeof(tmpprompt));
 
-	f = fopen(filename, "w+");
+	f = fopen(filename, "a+");
 	if (f == NULL)
 		return;