diff options
Diffstat (limited to 'string/bzero.c')
| -rw-r--r-- | string/bzero.c | 83 |
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) |