[PATCH v2] vi: Ensure that the edit buffer ends in a newline

[Petja Patjas]

On Mon, Apr 17, 2023 at 04:28:53PM +0300, Petja Patjas wrote:
> Currently vi assumes that the edit buffer ends in a newline. This may
> not be the case. For example:
> 
>   $ printf test > test
>   $ vi test
>   <press 'o'>
> 
> We fix this by inserting a newline to the end during initialization.
> 
> Signed-off-by: Petja Patjas <pp01415943 at gmail.com>
> ---
> 
> The first patch didn't apply, sorry about that. I also took this chance
> to simplify the logic a bit.
> 
>  editors/vi.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/editors/vi.c b/editors/vi.c
> index 2645afe87..2947c5c1b 100644
> --- a/editors/vi.c
> +++ b/editors/vi.c
> @@ -2315,9 +2315,10 @@ static int init_text_buffer(char *fn)
>  
>  	update_filename(fn);
>  	rc = file_insert(fn, text, 1);
> -	if (rc < 0) {
> -		// file doesnt exist. Start empty buf with dummy line
> -		char_insert(text, '\n', NO_UNDO);
> +	if (rc <= 0 || *(end - 1) != '\n') {
> +		// file doesn't exist or doesn't end in a newline.
> +		// insert a newline to the end
> +		char_insert(end, '\n', NO_UNDO);
>  	}
>  
>  	flush_undo_data();
> -- 
> 2.40.0
> 

Any comments on this patch?