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3185942a JA |
1 | /* zcatfd - copy contents of file descriptor to another */ |
2 | ||
7117c2d2 JA |
3 | /* Copyright (C) 2002 Free Software Foundation, Inc. |
4 | ||
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
3185942a JA |
7 | Bash is free software: you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | Bash is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
7117c2d2 | 16 | |
3185942a JA |
17 | You should have received a copy of the GNU General Public License |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
7117c2d2 JA |
20 | |
21 | #include <config.h> | |
22 | ||
23 | #include <sys/types.h> | |
24 | ||
25 | #if defined (HAVE_UNISTD_H) | |
26 | # include <unistd.h> | |
27 | #endif | |
28 | ||
29 | #include <errno.h> | |
30 | ||
31 | #include <stdc.h> | |
32 | ||
33 | #if !defined (errno) | |
34 | extern int errno; | |
35 | #endif | |
36 | ||
37 | extern ssize_t zread __P((int, char *, size_t)); | |
38 | extern int zwrite __P((int, char *, ssize_t)); | |
39 | ||
40 | /* Dump contents of file descriptor FD to OFD. FN is the filename for | |
41 | error messages (not used right now). */ | |
42 | int | |
43 | zcatfd (fd, ofd, fn) | |
44 | int fd, ofd; | |
45 | char *fn; | |
46 | { | |
47 | ssize_t nr; | |
48 | int rval; | |
49 | char lbuf[128]; | |
50 | ||
51 | rval = 0; | |
52 | while (1) | |
53 | { | |
54 | nr = zread (fd, lbuf, sizeof (lbuf)); | |
55 | if (nr == 0) | |
56 | break; | |
57 | else if (nr < 0) | |
58 | { | |
59 | rval = -1; | |
60 | break; | |
61 | } | |
62 | else if (zwrite (ofd, lbuf, nr) < 0) | |
63 | { | |
64 | rval = -1; | |
65 | break; | |
66 | } | |
67 | } | |
68 | ||
69 | return rval; | |
70 | } |