| The Android Open Source Project | a27d2ba | 2008-10-21 07:00:00 -0700 | [diff] [blame^] | 1 | /* $OpenBSD: wsetup.c,v 1.7 2005/08/08 08:05:36 espie Exp $ */ |
| 2 | /*- |
| 3 | * Copyright (c) 1990, 1993 |
| 4 | * The Regents of the University of California. All rights reserved. |
| 5 | * |
| 6 | * This code is derived from software contributed to Berkeley by |
| 7 | * Chris Torek. |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | #include <stdio.h> |
| 35 | #include <stdlib.h> |
| 36 | #include "local.h" |
| 37 | |
| 38 | /* |
| 39 | * Various output routines call wsetup to be sure it is safe to write, |
| 40 | * because either _flags does not include __SWR, or _buf is NULL. |
| 41 | * _wsetup returns 0 if OK to write, nonzero otherwise. |
| 42 | */ |
| 43 | int |
| 44 | __swsetup(FILE *fp) |
| 45 | { |
| 46 | /* make sure stdio is set up */ |
| 47 | if (!__sdidinit) |
| 48 | __sinit(); |
| 49 | |
| 50 | /* |
| 51 | * If we are not writing, we had better be reading and writing. |
| 52 | */ |
| 53 | if ((fp->_flags & __SWR) == 0) { |
| 54 | if ((fp->_flags & __SRW) == 0) |
| 55 | return (EOF); |
| 56 | if (fp->_flags & __SRD) { |
| 57 | /* clobber any ungetc data */ |
| 58 | if (HASUB(fp)) |
| 59 | FREEUB(fp); |
| 60 | fp->_flags &= ~(__SRD|__SEOF); |
| 61 | fp->_r = 0; |
| 62 | fp->_p = fp->_bf._base; |
| 63 | } |
| 64 | fp->_flags |= __SWR; |
| 65 | } |
| 66 | |
| 67 | /* |
| 68 | * Make a buffer if necessary, then set _w. |
| 69 | */ |
| 70 | if (fp->_bf._base == NULL) { |
| 71 | if ((fp->_flags & (__SSTR | __SALC)) == __SSTR) |
| 72 | return (EOF); |
| 73 | __smakebuf(fp); |
| 74 | } |
| 75 | if (fp->_flags & __SLBF) { |
| 76 | /* |
| 77 | * It is line buffered, so make _lbfsize be -_bufsize |
| 78 | * for the putc() macro. We will change _lbfsize back |
| 79 | * to 0 whenever we turn off __SWR. |
| 80 | */ |
| 81 | fp->_w = 0; |
| 82 | fp->_lbfsize = -fp->_bf._size; |
| 83 | } else |
| 84 | fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size; |
| 85 | return (0); |
| 86 | } |