Comment inline.

On Wed, Dec 13, 2023 at 12:55:27PM +0100, Roberto E. Vargas Caballero wrote:
> This makes possible to use the function to initialize the string from
> an existing char array.
> ---
>  ed.c | 30 +++++++++++++++++++++---------
>  1 file changed, 21 insertions(+), 9 deletions(-)
> 
> diff --git a/ed.c b/ed.c
> index b430e74..13e956a 100644
> --- a/ed.c
> +++ b/ed.c
> @@ -122,12 +122,24 @@ prevln(int line)
>  }
>  
>  static String *
> -string(String *s)
> +string(String *s, char *from)

Nit as it's more a matter of style: I'd prefer to have one function to
create a String and another function to create a String from a char
array. This would make a cleaner interface and avoids passing and
dealing with NULL all the time.

>  {
> +     size_t len;
> +     char *t;
> +
> +     if (!from) {
> +             len = 0;
> +             t = NULL;
> +     } else {
> +             if ((t = strdup(from)) == NULL)
> +                     error("out of memory");
> +             len = strlen(t);
> +     }

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