| 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 | ␉if (!__sdidinit)␍␊ |
| 55 | ␉␉__sinit();␍␊ |
| 56 | ␍␊ |
| 57 | ␉/*␍␊ |
| 58 | ␉ * If we are not writing, we had better be reading and writing.␍␊ |
| 59 | ␉ */␍␊ |
| 60 | ␉if ((fp->_flags & __SWR) == 0) {␍␊ |
| 61 | ␉␉if ((fp->_flags & __SRW) == 0) {␍␊ |
| 62 | ␉␉␉errno = EBADF;␍␊ |
| 63 | ␉␉␉fp->_flags |= __SERR;␍␊ |
| 64 | ␉␉␉return (EOF);␍␊ |
| 65 | ␉␉}␍␊ |
| 66 | ␉␉if (fp->_flags & __SRD) {␍␊ |
| 67 | ␉␉␉/* clobber any ungetc data */␍␊ |
| 68 | ␉␉␉if (HASUB(fp))␍␊ |
| 69 | ␉␉␉␉FREEUB(fp);␍␊ |
| 70 | ␉␉␉fp->_flags &= ~(__SRD|__SEOF);␍␊ |
| 71 | ␉␉␉fp->_r = 0;␍␊ |
| 72 | ␉␉␉fp->_p = fp->_bf._base;␍␊ |
| 73 | ␉␉}␍␊ |
| 74 | ␉␉fp->_flags |= __SWR;␍␊ |
| 75 | ␉}␍␊ |
| 76 | ␍␊ |
| 77 | ␉/*␍␊ |
| 78 | ␉ * Make a buffer if necessary, then set _w.␍␊ |
| 79 | ␉ */␍␊ |
| 80 | ␉if (fp->_bf._base == NULL)␍␊ |
| 81 | ␉␉__smakebuf(fp);␍␊ |
| 82 | ␉if (fp->_flags & __SLBF) {␍␊ |
| 83 | ␉␉/*␍␊ |
| 84 | ␉␉ * It is line buffered, so make _lbfsize be -_bufsize␍␊ |
| 85 | ␉␉ * for the putc() macro. We will change _lbfsize back␍␊ |
| 86 | ␉␉ * to 0 whenever we turn off __SWR.␍␊ |
| 87 | ␉␉ */␍␊ |
| 88 | ␉␉fp->_w = 0;␍␊ |
| 89 | ␉␉fp->_lbfsize = -fp->_bf._size;␍␊ |
| 90 | ␉} else␍␊ |
| 91 | ␉␉fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size;␍␊ |
| 92 | ␉return (0);␍␊ |
| 93 | }␍␊ |
| 94 | |
