1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "busybox.h"
#if BUFSIZ < 4096
#undef BUFSIZ
#define BUFSIZ 4096
#endif
/* If chunksize is 0 copy until EOF */
extern int bb_copyfd(int fd1, int fd2, const off_t chunksize)
{
ssize_t nread;
size_t size;
off_t remaining;
RESERVE_CONFIG_BUFFER(buffer,BUFSIZ);
remaining = size = BUFSIZ;
if (chunksize) {
remaining = chunksize;
}
do {
if (size > remaining) {
size = remaining;
}
if ((nread = safe_read(fd1, buffer, size)) > 0) {
if (bb_full_write(fd2, buffer, nread) < 0) {
bb_perror_msg(bb_msg_write_error); /* match Read error below */
break;
}
if (chunksize && ((remaining -= nread) == 0)) {
return 0;
}
} else if (!nread) {
if (chunksize) {
bb_error_msg("Unable to read all data");
break;
}
return 0;
} else { /* nread < 0 */
bb_perror_msg("Read error"); /* match bb_msg_write_error above */
break;
}
} while (1);
return -1;
}
|
