Commit | Line | Data |
---|---|---|
c9be6cfe KB |
1 | /*- |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * Chris Torek. | |
7 | * | |
8 | * %sccs.include.redist.c% | |
9 | */ | |
10 | ||
11 | #if defined(LIBC_SCCS) && !defined(lint) | |
d25ccb19 | 12 | static char sccsid[] = "@(#)funopen.c 5.2 (Berkeley) %G%"; |
c9be6cfe KB |
13 | #endif /* LIBC_SCCS and not lint */ |
14 | ||
15 | #include <stdio.h> | |
16 | #include <errno.h> | |
17 | #include "local.h" | |
18 | ||
19 | FILE * | |
20 | funopen(cookie, readfn, writefn, seekfn, closefn) | |
d25ccb19 | 21 | const void *cookie; |
c9be6cfe KB |
22 | int (*readfn)(), (*writefn)(); |
23 | #if __STDC__ | |
d25ccb19 | 24 | fpos_t (*seekfn)(void *cookie, fpos_t off, int whence); |
c9be6cfe KB |
25 | #else |
26 | fpos_t (*seekfn)(); | |
27 | #endif | |
28 | int (*closefn)(); | |
29 | { | |
30 | register FILE *fp; | |
31 | int flags; | |
32 | ||
33 | if (readfn == NULL) { | |
34 | if (writefn == NULL) { /* illegal */ | |
35 | errno = EINVAL; | |
36 | return (NULL); | |
37 | } else | |
38 | flags = __SWR; /* write only */ | |
39 | } else { | |
40 | if (writefn == NULL) | |
41 | flags = __SRD; /* read only */ | |
42 | else | |
43 | flags = __SRW; /* read-write */ | |
44 | } | |
45 | if ((fp = __sfp()) == NULL) | |
46 | return (NULL); | |
47 | fp->_flags = flags; | |
48 | fp->_file = -1; | |
d25ccb19 | 49 | fp->_cookie = (void *)cookie; |
c9be6cfe KB |
50 | fp->_read = readfn; |
51 | fp->_write = writefn; | |
52 | fp->_seek = seekfn; | |
53 | fp->_close = closefn; | |
54 | return (fp); | |
55 | } |