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glibc/string/memset.c
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/* Copyright (C) 1991-2016 Free Software Foundation, Inc. | |
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 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, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <string.h> | |
#include <memcopy.h> | |
#undef memset | |
void * | |
inhibit_loop_to_libcall | |
memset (void *dstpp, int c, size_t len) | |
{ | |
long int dstp = (long int) dstpp; | |
if (len >= 8) | |
{ | |
size_t xlen; | |
op_t cccc; | |
cccc = (unsigned char) c; | |
cccc |= cccc << 8; | |
cccc |= cccc << 16; | |
if (OPSIZ > 4) | |
/* Do the shift in two steps to avoid warning if long has 32 bits. */ | |
cccc |= (cccc << 16) << 16; | |
/* There are at least some bytes to set. | |
No need to test for LEN == 0 in this alignment loop. */ | |
while (dstp % OPSIZ != 0) | |
{ | |
((byte *) dstp)[0] = c; | |
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] = cccc; | |
((op_t *) dstp)[1] = cccc; | |
((op_t *) dstp)[2] = cccc; | |
((op_t *) dstp)[3] = cccc; | |
((op_t *) dstp)[4] = cccc; | |
((op_t *) dstp)[5] = cccc; | |
((op_t *) dstp)[6] = cccc; | |
((op_t *) dstp)[7] = cccc; | |
dstp += 8 * OPSIZ; | |
xlen -= 1; | |
} | |
len %= OPSIZ * 8; | |
/* Write 1 `op_t' per iteration until less than OPSIZ bytes remain. */ | |
xlen = len / OPSIZ; | |
while (xlen > 0) | |
{ | |
((op_t *) dstp)[0] = cccc; | |
dstp += OPSIZ; | |
xlen -= 1; | |
} | |
len %= OPSIZ; | |
} | |
/* Write the last few bytes. */ | |
while (len > 0) | |
{ | |
((byte *) dstp)[0] = c; | |
dstp += 1; | |
len -= 1; | |
} | |
return dstpp; | |
} | |
libc_hidden_builtin_def (memset) |