kern/141682: [libc] [patch] Faster version of strncpy(3)

[Maxim Zakharov]

The following reply was made to PR kern/141682; it has been noted by GNATS.

From: Maxim Zakharov <maxime at maxime.net.ru>
To: bug-followup at FreeBSD.org, maxime at maxime.net.ru
Cc:  
Subject: Re: kern/141682: [libc] [patch] Faster version of strncpy(3)
Date: Thu, 17 Dec 2009 23:46:03 +0300

 Sorry, it seems one line was redundant:
 
 void * dps_strncpy(char *dst0, char *src0, size_t length) {
   if (length) {
     register size_t n = (length + 7) / 8;
     register size_t r = (length % 8);
     register char *dst = dst0, *src = src0;
     if (r == 0) r = 8;
     if (!(dst[0] = src[0])) return dst0;
     if (r > 1) if (!(dst[1] = src[1])) return dst0;
     if (r > 2) if (!(dst[2] = src[2])) return dst0;
     if (r > 3) if (!(dst[3] = src[3])) return dst0;
     if (r > 4) if (!(dst[4] = src[4])) return dst0;
     if (r > 5) if (!(dst[5] = src[5])) return dst0;
     if (r > 6) if (!(dst[6] = src[6])) return dst0;
     if (r > 7) if (!(dst[7] = src[7])) return dst0;
     src += r; dst += r;
     while (--n > 0) {
       if (!(dst[0] = src[0])) break;
       if (!(dst[1] = src[1])) break;
       if (!(dst[2] = src[2])) break;
       if (!(dst[3] = src[3])) break;
       if (!(dst[4] = src[4])) break;
       if (!(dst[5] = src[5])) break;
       if (!(dst[6] = src[6])) break;
       if (!(dst[7] = src[7])) break;
       src += 8; dst += 8;
     }
   }
   return dst0;
 }
 
 
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