[PATCH 1/3] Use standard C string APIs in FDT helper

[Atish Patra]

On Thu, Jul 23, 2020 at 10:38 PM Chang, Abner (HPS SW/FW Technologist)
<abner.chang at hpe.com> wrote:
>
>
>
> > -----Original Message-----
> > From: Anup Patel [mailto:Anup.Patel at wdc.com]
> > Sent: Friday, July 24, 2020 12:37 PM
> > To: Chang, Abner (HPS SW/FW Technologist) <abner.chang at hpe.com>;
> > opensbi at lists.infradead.org
> > Cc: Atish Patra <Atish.Patra at wdc.com>; Schaefer, Daniel (DualStudy)
> > <daniel.schaefer at hpe.com>
> > Subject: RE: [PATCH 1/3] Use standard C string APIs in FDT helper
> >
> >
> >
> > > -----Original Message-----
> > > From: Abner Chang <abner.chang at hpe.com>
> > > Sent: 23 July 2020 07:24
> > > To: opensbi at lists.infradead.org
> > > Cc: abner.chang at hpe.com; Atish Patra <Atish.Patra at wdc.com>; Anup
> > Patel
> > > <Anup.Patel at wdc.com>; Daniel Schaefer <daniel.schaefer at hpe.com>
> > > Subject: [PATCH 1/3] Use standard C string APIs in FDT helper
> > >
> > > Use strncmp instead of using sbi_strcmp directly in fdthelp.c.
> > > - This commit add implementation of sbi_strncmp.
> > >
> > > Signed-off-by: Abner Chang <abner.chang at hpe.com>
> > >
> > > Cc: Atish Patra <atish.patra at wdc.com>
> > > Cc: Anup Patel <anup.patel at wdc.com>
> > > Cc: Daniel Schaefer <daniel.schaefer at hpe.com>
> > > ---
> > >  include/sbi/sbi_string.h | 2 +-
> > >  lib/sbi/sbi_string.c     | 4 ++--
> > >  2 files changed, 3 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/include/sbi/sbi_string.h b/include/sbi/sbi_string.h index
> > > 338075f..5e7304f 100644
> > > --- a/include/sbi/sbi_string.h
> > > +++ b/include/sbi/sbi_string.h
> > > @@ -12,7 +12,7 @@
> > >
> > >  #include <sbi/sbi_types.h>
> > >
> > > -int sbi_strcmp(const char *a, const char *b);
> > > +int sbi_strncmp(const char *a, const char *b, size_t count);
> > >
> > >  size_t sbi_strlen(const char *str);
> > >
> > > diff --git a/lib/sbi/sbi_string.c b/lib/sbi/sbi_string.c index
> > > 38b700b..c29120a
> > > 100644
> > > --- a/lib/sbi/sbi_string.c
> > > +++ b/lib/sbi/sbi_string.c
> > > @@ -14,10 +14,10 @@
> > >
> > >  #include <sbi/sbi_string.h>
> > >
> > > -int sbi_strcmp(const char *a, const char *b)
> > > +int sbi_strncmp(const char *a, const char *b, size_t count)
> > >  {
> > >     /* search first diff or end of string */
> > > -   for (; *a == *b && *a != '\0'; a++, b++)
> > > +   for (; count > 0 && *a == *b && *a != '\0'; a++, b++, count--)
> > >             ;
> > >
> > >     return *a - *b;
> > > --
> > > 2.25.0
> >
> > I think we should keep both sbi_strcmp() and sbi_strncmp().
> Hi Anup, do you think we should prevent people to use sbi_strcmp()?
>
The only reason we may want to keep the sbi_strcmp() just for completeness sake.
In case, some of the libfdt functions use it in some revision.

If we decide to keep it, we should put a big comment on top sbi_strcmp
clearly mentioning that
it is not recommended to use sbi_strcmp at all.

> Thanks
> Abner
> >
> > Otherwise looks good to me.
> >
> > Reviewed-by: Anup Patel <anup.patel at wdc.com>
> >
> > Regards,
> > Anup
>
>
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-- 
Regards,
Atish