| | 1 | /*- |
| | 2 | * Copyright (c) 1990, 1993 |
| | 3 | * The Regents of the University of California. All rights reserved. |
| | 4 | * |
| | 5 | * This code is derived from software contributed to Berkeley by |
| | 6 | * Chris Torek. |
| | 7 | * |
| | 8 | * Redistribution and use in source and binary forms, with or without |
| | 9 | * modification, are permitted provided that the following conditions |
| | 10 | * are met: |
| | 11 | * 1. Redistributions of source code must retain the above copyright |
| | 12 | * notice, this list of conditions and the following disclaimer. |
| | 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 14 | * notice, this list of conditions and the following disclaimer in the |
| | 15 | * documentation and/or other materials provided with the distribution. |
| | 16 | * 4. Neither the name of the University nor the names of its contributors |
| | 17 | * may be used to endorse or promote products derived from this software |
| | 18 | * without specific prior written permission. |
| | 19 | * |
| | 20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 30 | * SUCH DAMAGE. |
| | 31 | */ |
| | 32 | |
| | 33 | #if defined(LIBC_SCCS) && !defined(lint) |
| | 34 | static char sccsid[] = "@(#)wsetup.c 8.1 (Berkeley) 6/4/93"; |
| | 35 | #endif /* LIBC_SCCS and not lint */ |
| | 36 | #include <sys/cdefs.h> |
| | 37 | __FBSDID("$FreeBSD: src/lib/libc/stdio/wsetup.c,v 1.11 2009/01/08 06:38:06 das Exp $"); |
| | 38 | |
| | 39 | #include <errno.h> |
| | 40 | #include <stdio.h> |
| | 41 | #include <stdlib.h> |
| | 42 | #include "local.h" |
| | 43 | |
| | 44 | /* |
| | 45 | * Various output routines call wsetup to be sure it is safe to write, |
| | 46 | * because either _flags does not include __SWR, or _buf is NULL. |
| | 47 | * _wsetup returns 0 if OK to write; otherwise, it returns EOF and sets errno. |
| | 48 | */ |
| | 49 | int |
| | 50 | __swsetup(fp) |
| | 51 | FILE *fp; |
| | 52 | { |
| | 53 | /* make sure stdio is set up */ |
| | 54 | pthread_once(&__sdidinit, __sinit); |
| | 55 | |
| | 56 | /* |
| | 57 | * If we are not writing, we had better be reading and writing. |
| | 58 | */ |
| | 59 | if ((fp->_flags & __SWR) == 0) { |
| | 60 | if ((fp->_flags & __SRW) == 0) { |
| | 61 | errno = EBADF; |
| | 62 | fp->_flags |= __SERR; |
| | 63 | return (EOF); |
| | 64 | } |
| | 65 | if (fp->_flags & __SRD) { |
| | 66 | /* clobber any ungetc data */ |
| | 67 | if (HASUB(fp)) |
| | 68 | FREEUB(fp); |
| | 69 | fp->_flags &= ~(__SRD|__SEOF); |
| | 70 | fp->_r = 0; |
| | 71 | fp->_p = fp->_bf._base; |
| | 72 | } |
| | 73 | fp->_flags |= __SWR; |
| | 74 | } |
| | 75 | |
| | 76 | /* |
| | 77 | * Make a buffer if necessary, then set _w. |
| | 78 | */ |
| | 79 | if (fp->_bf._base == NULL) |
| | 80 | __smakebuf(fp); |
| | 81 | if (fp->_flags & __SLBF) { |
| | 82 | /* |
| | 83 | * It is line buffered, so make _lbfsize be -_bufsize |
| | 84 | * for the putc() macro. We will change _lbfsize back |
| | 85 | * to 0 whenever we turn off __SWR. |
| | 86 | */ |
| | 87 | fp->_w = 0; |
| | 88 | fp->_lbfsize = -fp->_bf._size; |
| | 89 | } else |
| | 90 | fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size; |
| | 91 | return (0); |
| | 92 | } |
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