lkml.org 
[lkml]   [1998]   [Apr]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: faster strcpy()
On Fri, Apr 24, 1998 at 02:20:13AM -0500, umforema@cc.UManitoba.CA wrote:
> I'm not sure if this is a libc thing or a kernel thing, but I noticed
> that strcpy is in the kernel include files, so here goes...
> I changed the definition of strcpy in /usr/include/string.h to
>
> #define strcpy(a,b) (char *)memcpy(a,b,strlen(b))
>
> It slightly more than doubles the speed of strcpy on my pentium machine.

Its a userland thing. The kernel has its own string functions.


As to why the above is faster in userland, that seems really odd. I would
assume the libc string copy to be something like:

char *strcpy(char *a,char*b)
{
char c = b;
while(*a++ = *b++);
return c;
}

Which I can't see how it could be slower than what you are using...




-Chris

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu

\
 
 \ /
  Last update: 2005-03-22 13:42    [W:0.082 / U:0.068 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site