1 /* Copyright 1996-1999,2001,2002,2009 Alain Knaff.
2 * This file is part of mtools.
3 *
4 * Mtools is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * Mtools is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with Mtools. If not, see <http://www.gnu.org/licenses/>.
16 */
17 #include "sysincludes.h"
18 #include "msdos.h"
19 #include "mtools.h"
20 #include "file.h"
21 #include "llong.h"
22
23 /*
24 * Copy the data from source to target
25 */
26
copyfile(Stream_t * Source,Stream_t * Target)27 int copyfile(Stream_t *Source, Stream_t *Target)
28 {
29 char buffer[8*16384];
30 mt_off_t pos;
31 int ret;
32 ssize_t retw;
33 /* size_t len;*/
34 mt_size_t mt_len;
35
36 if (!Source){
37 fprintf(stderr,"Couldn't open source file\n");
38 return -1;
39 }
40
41 if (!Target){
42 fprintf(stderr,"Couldn't open target file\n");
43 return -1;
44 }
45
46 pos = 0;
47 GET_DATA(Source, 0, &mt_len, 0, 0);
48 while(1){
49 ret = READS(Source, buffer, (mt_off_t) pos, 8*16384);
50 if (ret < 0 ){
51 perror("file read");
52 return -1;
53 }
54 if(!ret)
55 break;
56 if(got_signal)
57 return -1;
58 if (ret == 0)
59 break;
60 if ((retw = force_write(Target, buffer,
61 (mt_off_t) pos, (size_t) ret)) != ret){
62 if(retw < 0 )
63 perror("write in copy");
64 else
65 fprintf(stderr,
66 "Short write %lu instead of %d\n",
67 (unsigned long) retw, ret);
68 if(errno == ENOSPC)
69 got_signal = 1;
70 return ret;
71 }
72 pos += ret;
73 }
74 return 0;
75 }
76