diff options
Diffstat (limited to 'sysdeps/generic/bzero.c')
| -rw-r--r-- | sysdeps/generic/bzero.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/sysdeps/generic/bzero.c b/sysdeps/generic/bzero.c new file mode 100644 index 0000000000..7ebdcfe7e3 --- /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; + } +} + |