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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) | |
cb631443 | 12 | static char sccsid[] = "@(#)fpurge.c 5.2 (Berkeley) %G%"; |
c9be6cfe KB |
13 | #endif /* LIBC_SCCS and not lint */ |
14 | ||
15 | #include <errno.h> | |
16 | #include <stdio.h> | |
cb631443 | 17 | #include <stdlib.h> |
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18 | #include "local.h" |
19 | ||
20 | /* | |
21 | * fpurge: like fflush, but without writing anything: leave the | |
22 | * given FILE's buffer empty. | |
23 | */ | |
24 | int | |
25 | fpurge(fp) | |
26 | register FILE *fp; | |
27 | { | |
28 | if (!fp->_flags) { | |
29 | errno = EBADF; | |
30 | return(EOF); | |
31 | } | |
32 | ||
33 | if (HASUB(fp)) | |
34 | FREEUB(fp); | |
35 | fp->_p = fp->_bf._base; | |
36 | fp->_r = 0; | |
37 | fp->_w = fp->_flags & (__SLBF|__SNBF) ? 0 : fp->_bf._size; | |
38 | return (0); | |
39 | } |