mirror of
https://github.com/reactos/reactos.git
synced 2024-08-30 15:18:33 +00:00
100 lines
1.9 KiB
C
100 lines
1.9 KiB
C
/* @(#)fillbytes.c 1.18 10/08/21 Copyright 1987, 1995-2010 J. Schilling */
|
|
/*
|
|
* fill memory with data
|
|
*
|
|
* Copyright (c) 1987, 1995-2010 J. Schilling
|
|
*/
|
|
/*
|
|
* The contents of this file are subject to the terms of the
|
|
* Common Development and Distribution License, Version 1.0 only
|
|
* (the "License"). You may not use this file except in compliance
|
|
* with the License.
|
|
*
|
|
* See the file CDDL.Schily.txt in this distribution for details.
|
|
*
|
|
* When distributing Covered Code, include this CDDL HEADER in each
|
|
* file and include the License file CDDL.Schily.txt from this distribution.
|
|
*/
|
|
|
|
#include <schily/standard.h>
|
|
#include <schily/align.h>
|
|
#include <schily/types.h>
|
|
#include <schily/schily.h>
|
|
|
|
#define DO8(a) a; a; a; a; a; a; a; a;
|
|
|
|
#define cval ((char)lval)
|
|
|
|
/*
|
|
* fillbytes(to, cnt, val) is the same as memset(to, val, cnt)
|
|
*/
|
|
#ifdef PROTOTYPES
|
|
EXPORT char *
|
|
fillbytes(void *tov, ssize_t cnt, char val)
|
|
#else
|
|
EXPORT char *
|
|
fillbytes(tov, cnt, val)
|
|
void *tov;
|
|
ssize_t cnt;
|
|
char val;
|
|
#endif
|
|
{
|
|
register char *to = (char *)tov;
|
|
register ssize_t n;
|
|
register long lval;
|
|
|
|
/*
|
|
* If we change cnt to be unsigned, check for == instead of <=
|
|
*/
|
|
if ((n = cnt) <= 0)
|
|
return (to);
|
|
|
|
lval = val & 0xFF;
|
|
|
|
/*
|
|
* Assign byte-wise until properly aligned for a long pointer.
|
|
*/
|
|
while (--n >= 0 && !laligned(to)) {
|
|
*to++ = cval;
|
|
}
|
|
n++;
|
|
|
|
if (n >= (ssize_t)(8 * sizeof (long))) {
|
|
register ssize_t rem = n % (8 * sizeof (long));
|
|
|
|
lval |= (lval<<8);
|
|
lval |= (lval<<16);
|
|
#if SIZE_LONG > SIZE_INT
|
|
lval |= (lval<<32);
|
|
#endif
|
|
|
|
n /= (8 * sizeof (long));
|
|
{
|
|
register long *tol = (long *)to;
|
|
|
|
do {
|
|
DO8 (*tol++ = lval);
|
|
} while (--n > 0);
|
|
|
|
to = (char *)tol;
|
|
}
|
|
n = rem;
|
|
|
|
if (n >= 8) {
|
|
n -= 8;
|
|
do {
|
|
DO8 (*to++ = cval);
|
|
} while ((n -= 8) >= 0);
|
|
n += 8;
|
|
}
|
|
if (n > 0) do {
|
|
*to++ = cval;
|
|
} while (--n > 0);
|
|
return (to);
|
|
}
|
|
if (n > 0) do {
|
|
*to++ = cval;
|
|
} while (--n > 0);
|
|
return (to);
|
|
}
|