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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/generic/bzero.c
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initial import
Diffstat (limited to 'sysdeps/generic/bzero.c')
-rw-r--r--sysdeps/generic/bzero.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/sysdeps/generic/bzero.c b/sysdeps/generic/bzero.c
new file mode 100644
index 0000000..7ebdcfe
--- /dev/null
+++ b/sysdeps/generic/bzero.c
@@ -0,0 +1,81 @@
+/* Copyright (C) 1991 Free Software Foundation, Inc.
+ Contributed by Torbjorn Granlund (tege@sics.se).
+
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <string.h>
+#include <memcopy.h>
+
+/* Set N bytes of S to 0. */
+void
+DEFUN(bzero, (s, n), PTR s AND 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;
+ }
+}
+