[PATCH v5 2/8] lib: sbi: Add sbi_nputs() function

[Jessica Clarke <jrtc27@jrtc27.com>]

On 9 Feb 2023, at 16:59, Anup Patel <anup@brainfault.org> wrote:
> 
> On Tue, Jan 31, 2023 at 11:02 PM Andrew Jones <ajones@ventanamicro.com> wrote:
>> 
>> On Fri, Jan 13, 2023 at 05:11:04PM +0530, Anup Patel wrote:
>>> We add new sbi_nputs() which help us print a fixed number of characters
>>> from a physical memory location.
>>> 
>>> Signed-off-by: Anup Patel <apatel@ventanamicro.com>
>>> Reviewed-by: Atish Patra <atishp@rivosinc.com>
>>> Reviewed-by: Bin Meng <bmeng@tinylab.org>
>>> Reviewed-by: Xiang W <wxjstz@126.com>
>>> ---
>>> include/sbi/sbi_console.h |  2 ++
>>> lib/sbi/sbi_console.c     | 10 ++++++++++
>>> 2 files changed, 12 insertions(+)
>>> 
>>> diff --git a/include/sbi/sbi_console.h b/include/sbi/sbi_console.h
>>> index e15b55d..1bdeeb9 100644
>>> --- a/include/sbi/sbi_console.h
>>> +++ b/include/sbi/sbi_console.h
>>> @@ -33,6 +33,8 @@ void sbi_putc(char ch);
>>> 
>>> void sbi_puts(const char *str);
>>> 
>>> +void sbi_nputs(const char *str, unsigned long len);
>>> +
>>> void sbi_gets(char *s, int maxwidth, char endchar);
>>> 
>>> int __printf(2, 3) sbi_sprintf(char *out, const char *format, ...);
>>> diff --git a/lib/sbi/sbi_console.c b/lib/sbi/sbi_console.c
>>> index bb6e1ef..946c61d 100644
>>> --- a/lib/sbi/sbi_console.c
>>> +++ b/lib/sbi/sbi_console.c
>>> @@ -51,6 +51,16 @@ void sbi_puts(const char *str)
>>>      spin_unlock(&console_out_lock);
>>> }
>>> 
>>> +void sbi_nputs(const char *str, unsigned long len)
>>> +{
>>> +     unsigned long i;
>>> +
>>> +     spin_lock(&console_out_lock);
>>> +     for (i = 0; i < len; i++)
>>> +             sbi_putc(str[i]);
>> 
>> sbi_putc() adds '\r' after '\n'. So, sbi_nputs("\n\n\n\n", 4)
>> actually outputs 8 chars, but I imagine the new debug extension
>> will still report it only wrote 4. Is that a problem?
> 
> I don't see this as a problem because the additional '\r' is only
> for correctly rederring the effect of `\n` on console.
> 
> In other words, the nputs() function is still printing all the
> characters it got as parameters and additionally it is printing
> few more characters.

Which is the same as the Unix tty layer when onlcr is set.

Jess