Re: [BK PATCH] One strdup() to rule them all

[Dan Aloni <da-x@gmx.net>]

On Mon, Aug 25, 2003 at 12:25:32PM -0400, Jakub Jelinek wrote:
> On Mon, Aug 25, 2003 at 07:14:35PM +0300, Dan Aloni wrote:
> > diff -Nru a/lib/string.c b/lib/string.c
> > --- a/lib/string.c	Mon Aug 25 19:03:26 2003
> > +++ b/lib/string.c	Mon Aug 25 19:03:26 2003
> > @@ -582,3 +582,19 @@
> >  }
> >  
> >  #endif
> > +
> > +/**
> > + * strdup - Allocate a copy of a string.
> > + * @s: The string to copy. Must not be NULL.
> > + *
> > + * returns the address of the allocation, or NULL on
> > + * error. 
> > + */
> > +char *strdup(const char *s)
> > +{
> > +	char *rv = kmalloc(strlen(s)+1, GFP_KERNEL);
> > +	if (rv)
> > +		strcpy(rv, s);
> > +	return rv;
> > +}
> > +EXPORT_SYMBOL(strdup);
> 
> Better save strlen(s)+1 in a local size_t variable and use memcpy instead
> of strcpy.

Maybe, but no optimizations like this are needed for a function 
such as strdup() which is called relatively rare.

-- 
Dan Aloni
da-x@gmx.net