lib/glibc
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2004-10-18  Jakub Jelinek  <jakub@redhat.com>

	* sysdeps/generic/strcpy_chk.c (__strcpy_chk): Speed up by checking
	destlen only every 4 bytes.
This commit is contained in:
Ulrich Drepper
2004-10-19 21:21:42 +00:00
parent 653aeda549
commit 708c687a6f
2 changed files with 31 additions and 4 deletions
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5
ChangeLog
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@@ -1,3 +1,8 @@
2004-10-18 Jakub Jelinek <jakub@redhat.com>
* sysdeps/generic/strcpy_chk.c (__strcpy_chk): Speed up by checking
destlen only every 4 bytes.
2004-10-19 Ulrich Drepper <drepper@redhat.com> 2004-10-19 Ulrich Drepper <drepper@redhat.com>
* nss/getent.c (hosts_keys): Let inet_pton decide whether the * nss/getent.c (hosts_keys): Let inet_pton decide whether the

28
sysdeps/generic/strcpy_chk.c
View File

@@ -31,14 +31,36 @@ __strcpy_chk (dest, src, destlen)
{ {
reg_char c; reg_char c;
char *s = (char *) src; char *s = (char *) src;
const ptrdiff_t off = dest - s - 1; const ptrdiff_t off = dest - s;
while (__builtin_expect (destlen >= 4, 0))
{
c = s[0];
s[off] = c;
if (c == '\0')
return dest;
c = s[1];
s[off + 1] = c;
if (c == '\0')
return dest;
c = s[2];
s[off + 2] = c;
if (c == '\0')
return dest;
c = s[3];
s[off + 3] = c;
if (c == '\0')
return dest;
destlen -= 4;
s += 4;
}
do do
{ {
if (__builtin_expect (destlen-- == 0, 0)) if (__builtin_expect (destlen-- == 0, 0))
__chk_fail (); __chk_fail ();
c = *s++; c = *s;
s[off] = c; *(s++ + off) = c;
} }
while (c != '\0'); while (c != '\0');