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arch/parisc/lib/memset.c
2.38 KB
1da177e4c Linux-2.6.12-rc2 |
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/* Copyright (C) 1991, 1997 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ /* Slight modifications for pa-risc linux - Paul Bame <bame@debian.org> */ #include <linux/types.h> #include <asm/string.h> #define OPSIZ (BITS_PER_LONG/8) typedef unsigned long op_t; void * memset (void *dstpp, int sc, size_t len) { unsigned int c = sc; 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) { ((unsigned char *) 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) { ((unsigned char *) dstp)[0] = c; dstp += 1; len -= 1; } return dstpp; } |