ReactOS  0.4.13-dev-1148-g9b75b67
fillbytes.c
Go to the documentation of this file.
1 /* @(#)fillbytes.c 1.18 10/08/21 Copyright 1987, 1995-2010 J. Schilling */
2 /*
3  * fill memory with data
4  *
5  * Copyright (c) 1987, 1995-2010 J. Schilling
6  */
7 /*
8  * The contents of this file are subject to the terms of the
9  * Common Development and Distribution License, Version 1.0 only
10  * (the "License"). You may not use this file except in compliance
11  * with the License.
12  *
13  * See the file CDDL.Schily.txt in this distribution for details.
14  *
15  * When distributing Covered Code, include this CDDL HEADER in each
16  * file and include the License file CDDL.Schily.txt from this distribution.
17  */
18 
19 #include <schily/standard.h>
20 #include <schily/align.h>
21 #include <schily/types.h>
22 #include <schily/schily.h>
23 
24 #define DO8(a) a; a; a; a; a; a; a; a;
25 
26 #define cval ((char)lval)
27 
28 /*
29  * fillbytes(to, cnt, val) is the same as memset(to, val, cnt)
30  */
31 #ifdef PROTOTYPES
32 EXPORT char *
33 fillbytes(void *tov, ssize_t cnt, char val)
34 #else
35 EXPORT char *
36 fillbytes(tov, cnt, val)
37  void *tov;
38  ssize_t cnt;
39  char val;
40 #endif
41 {
42  register char *to = (char *)tov;
43  register ssize_t n;
44  register long lval;
45 
46  /*
47  * If we change cnt to be unsigned, check for == instead of <=
48  */
49  if ((n = cnt) <= 0)
50  return (to);
51 
52  lval = val & 0xFF;
53 
54  /*
55  * Assign byte-wise until properly aligned for a long pointer.
56  */
57  while (--n >= 0 && !laligned(to)) {
58  *to++ = cval;
59  }
60  n++;
61 
62  if (n >= (ssize_t)(8 * sizeof (long))) {
63  register ssize_t rem = n % (8 * sizeof (long));
64 
65  lval |= (lval<<8);
66  lval |= (lval<<16);
67 #if SIZE_LONG > SIZE_INT
68  lval |= (lval<<32);
69 #endif
70 
71  n /= (8 * sizeof (long));
72  {
73  register long *tol = (long *)to;
74 
75  do {
76  DO8 (*tol++ = lval);
77  } while (--n > 0);
78 
79  to = (char *)tol;
80  }
81  n = rem;
82 
83  if (n >= 8) {
84  n -= 8;
85  do {
86  DO8 (*to++ = cval);
87  } while ((n -= 8) >= 0);
88  n += 8;
89  }
90  if (n > 0) do {
91  *to++ = cval;
92  } while (--n > 0);
93  return (to);
94  }
95  if (n > 0) do {
96  *to++ = cval;
97  } while (--n > 0);
98  return (to);
99 }
#define laligned(a)
Definition: align.h:19
#define cval
Definition: fillbytes.c:26
EXPORT char * fillbytes(void *tov, ssize_t cnt, char val)
Definition: fillbytes.c:36
GLdouble n
Definition: glext.h:7729
GLuint GLfloat * val
Definition: glext.h:7180
int ssize_t
Definition: rosdhcp.h:48
#define long
Definition: qsort.c:33
#define DO8(a)
Definition: fillbytes.c:24