linux-kernel - Re: [PATCHv2] seq_buf: add seq_buf_do

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Date:   Sat, 15 Apr 2023 16:04:06 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yosry Ahmed <yosryahmed@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] seq_buf: add seq_buf_do_printk() helper

On (23/04/14 11:00), Petr Mladek wrote:
> > +void seq_buf_do_printk(struct seq_buf *s, const char *lvl)
> > +{
> > +	const char *start, *lf;
> > +	int len;
> > +
> > +	if (s->size == 0 || s->len == 0)
> > +		return;
> > +
> > +	seq_buf_terminate(s);
> > +
> > +	start = s->buffer;
> > +	while ((lf = strchr(start, '\n'))) {
> > +		len = lf - start + 1;
> > +		printk("%s%.*s", lvl, len, start);
> > +		start = ++lf;
> > +	}
> > +
> > +	/* No trailing LF */
> > +	if (start < s->buffer + s->len) {
> > +		len = s->buffer + s->len - start;
> > +		printk("%s%.*s\n", lvl, len, start);
> 
> We know that the string is '\0' terminated, so the last print
> might be easier:
> 
> 	if (start < s->buffer + s->len)
> 		printk("%s%s\n", lvl, start);

Indeed. Steven, let me know if you'd prefer a v3.

> Anyway, it looks good. With or without this change:
> 
> Reviewed-by: Petr Mladek <pmladek@...e.com>

Thanks Petr!