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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /string/bzero.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
Diffstat (limited to 'string/bzero.c')
-rw-r--r--string/bzero.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/string/bzero.c b/string/bzero.c
new file mode 100644
index 0000000000..c6ede14139
--- /dev/null
+++ b/string/bzero.c
@@ -0,0 +1,83 @@
+/* Copyright (C) 1991, 1997, 1999 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Torbjorn Granlund (tege@sics.se).
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <string.h>
+#include <memcopy.h>
+
+#undef __bzero
+
+/* Set N bytes of S to 0. */
+void
+__bzero (s, len)
+ void *s;
+ size_t len;
+{
+ long int dstp = (long int) s;
+ const op_t zero = 0;
+
+ if (len >= 8)
+ {
+ size_t xlen;
+
+ /* There are at least some bytes to zero. No need to test
+ for LEN == 0 in this alignment loop. */
+ while (dstp % OPSIZ != 0)
+ {
+ ((byte *) dstp)[0] = 0;
+ dstp += 1;
+ len -= 1;
+ }
+
+ /* Write 8 op_t per iteration until less than 8 op_t remain. */
+ xlen = len / (OPSIZ * 8);
+ while (xlen != 0)
+ {
+ ((op_t *) dstp)[0] = zero;
+ ((op_t *) dstp)[1] = zero;
+ ((op_t *) dstp)[2] = zero;
+ ((op_t *) dstp)[3] = zero;
+ ((op_t *) dstp)[4] = zero;
+ ((op_t *) dstp)[5] = zero;
+ ((op_t *) dstp)[6] = zero;
+ ((op_t *) dstp)[7] = zero;
+ dstp += 8 * OPSIZ;
+ xlen -= 1;
+ }
+ len %= OPSIZ * 8;
+
+ /* Write 1 op_t per iteration until less than op_t remain. */
+ xlen = len / OPSIZ;
+ while (xlen != 0)
+ {
+ ((op_t *) dstp)[0] = zero;
+ dstp += OPSIZ;
+ xlen -= 1;
+ }
+ len %= OPSIZ;
+ }
+
+ /* Write the last few bytes. */
+ while (len != 0)
+ {
+ ((byte *) dstp)[0] = 0;
+ dstp += 1;
+ len -= 1;
+ }
+}
+weak_alias (__bzero, bzero)