ReactOS  0.4.14-dev-57-g333b8f1
movebytes.c File Reference
#include <schily/standard.h>
#include <schily/align.h>
#include <schily/types.h>
#include <schily/schily.h>
Include dependency graph for movebytes.c:

Go to the source code of this file.

Macros

#define DO8(a)   a; a; a; a; a; a; a; a;
 

Functions

EXPORT charmovebytes (void *fromv, void *tov, ssize_t cnt) const
 

Macro Definition Documentation

◆ DO8

#define DO8 (   a)    a; a; a; a; a; a; a; a;

Definition at line 24 of file movebytes.c.

Function Documentation

◆ movebytes()

EXPORT char* movebytes ( void fromv,
void tov,
ssize_t  cnt 
) const

Definition at line 30 of file movebytes.c.

34 {
35  register const char *from = fromv;
36  register char *to = tov;
37  register ssize_t n;
38 
39  /*
40  * If we change cnt to be unsigned, check for == instead of <=
41  */
42  if ((n = cnt) <= 0)
43  return (to);
44 
45  if (from >= to) {
46  /*
47  * source is on higher addresses than destination:
48  * move bytes forwards
49  */
50  if (n >= (ssize_t)(8 * sizeof (long))) {
51  if (l2aligned(from, to)) {
52  register const long *froml = (const long *)from;
53  register long *tol = (long *)to;
54  register ssize_t rem = n % (8 * sizeof (long));
55 
56  n /= (8 * sizeof (long));
57  do {
58  DO8 (*tol++ = *froml++);
59  } while (--n > 0);
60 
61  from = (const char *)froml;
62  to = (char *)tol;
63  n = rem;
64  }
65 
66  if (n >= 8) {
67  n -= 8;
68  do {
69  DO8 (*to++ = *from++);
70  } while ((n -= 8) >= 0);
71  n += 8;
72  }
73 
74  if (n > 0) do {
75  *to++ = *from++;
76  } while (--n > 0);
77  return (to);
78  }
79  if (n > 0) do {
80  *to++ = *from++;
81  } while (--n > 0);
82  return (to);
83  } else {
84  char *ep;
85 
86  /*
87  * source is on lower addresses than destination:
88  * move bytes backwards
89  */
90  to += n;
91  from += n;
92  ep = to;
93  if (n >= (ssize_t)(8 * sizeof (long))) {
94  if (l2aligned(from, to)) {
95  register const long *froml = (const long *)from;
96  register long *tol = (long *)to;
97  register ssize_t rem = n % (8 * sizeof (long));
98 
99  n /= (8 * sizeof (long));
100  do {
101  DO8 (*--tol = *--froml);
102  } while (--n > 0);
103 
104  from = (const char *)froml;
105  to = (char *)tol;
106  n = rem;
107  }
108  if (n >= 8) {
109  n -= 8;
110  do {
111  DO8 (*--to = *--from);
112  } while ((n -= 8) >= 0);
113  n += 8;
114  }
115  if (n > 0) do {
116  *--to = *--from;
117  } while (--n > 0);
118  return (ep);
119  }
120  if (n > 0) do {
121  *--to = *--from;
122  } while (--n > 0);
123  return (ep);
124  }
125 }
GLdouble n
Definition: glext.h:7729
#define l2aligned(a, b)
Definition: align.h:20
int ssize_t
Definition: rosdhcp.h:48
#define long
Definition: qsort.c:33
#define DO8(a)
Definition: movebytes.c:24
CardRegion * from
Definition: spigame.cpp:19

Referenced by _more_flags(), outputlist_insert(), and read_merging_directory().