17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate * CDDL HEADER START
37c478bd9Sstevel@tonic-gate *
47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the
5a5f69788Scraigm * Common Development and Distribution License (the "License").
6a5f69788Scraigm * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate *
87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate * and limitations under the License.
127c478bd9Sstevel@tonic-gate *
137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate *
197c478bd9Sstevel@tonic-gate * CDDL HEADER END
207c478bd9Sstevel@tonic-gate */
21a5f69788Scraigm
227c478bd9Sstevel@tonic-gate /*
23a574db85Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
247c478bd9Sstevel@tonic-gate * Use is subject to license terms.
257c478bd9Sstevel@tonic-gate */
267c478bd9Sstevel@tonic-gate
277c478bd9Sstevel@tonic-gate /* Copyright (c) 1988 AT&T */
28*cd62a92dSRobert Mustacchi /* All Rights Reserved */
297c478bd9Sstevel@tonic-gate
307257d1b4Sraf #pragma weak __filbuf = _filbuf
317c478bd9Sstevel@tonic-gate
327257d1b4Sraf #include "lint.h"
337c478bd9Sstevel@tonic-gate #include "file64.h"
347c478bd9Sstevel@tonic-gate #include <stdio.h>
357c478bd9Sstevel@tonic-gate #include <errno.h>
367c478bd9Sstevel@tonic-gate #include <sys/types.h>
377c478bd9Sstevel@tonic-gate #include <unistd.h>
387c478bd9Sstevel@tonic-gate #include "stdiom.h"
397c478bd9Sstevel@tonic-gate
407c478bd9Sstevel@tonic-gate
417c478bd9Sstevel@tonic-gate static int
_xpg4_check(void)427c478bd9Sstevel@tonic-gate _xpg4_check(void)
437c478bd9Sstevel@tonic-gate {
447c478bd9Sstevel@tonic-gate extern int __xpg4;
457c478bd9Sstevel@tonic-gate
467c478bd9Sstevel@tonic-gate return (__xpg4);
477c478bd9Sstevel@tonic-gate }
487c478bd9Sstevel@tonic-gate
497c478bd9Sstevel@tonic-gate /* fill buffer, return first character or EOF */
507c478bd9Sstevel@tonic-gate int
_filbuf(FILE * iop)517c478bd9Sstevel@tonic-gate _filbuf(FILE *iop)
527c478bd9Sstevel@tonic-gate {
537c478bd9Sstevel@tonic-gate ssize_t res;
547c478bd9Sstevel@tonic-gate size_t nbyte;
557c478bd9Sstevel@tonic-gate Uchar *endbuf;
567c478bd9Sstevel@tonic-gate #ifdef _LP64
577c478bd9Sstevel@tonic-gate unsigned int flag;
587c478bd9Sstevel@tonic-gate #else
597c478bd9Sstevel@tonic-gate unsigned char flag;
607c478bd9Sstevel@tonic-gate #endif
617c478bd9Sstevel@tonic-gate
62*cd62a92dSRobert Mustacchi if (!(iop->_flag & _IOREAD)) { /* check, correct permissions */
63*cd62a92dSRobert Mustacchi if (iop->_flag & _IORW) {
64*cd62a92dSRobert Mustacchi iop->_flag |= _IOREAD; /* change direction */
657c478bd9Sstevel@tonic-gate /* to read - fseek */
66*cd62a92dSRobert Mustacchi } else {
677c478bd9Sstevel@tonic-gate errno = EBADF;
687c478bd9Sstevel@tonic-gate return (EOF);
697c478bd9Sstevel@tonic-gate }
707c478bd9Sstevel@tonic-gate }
717c478bd9Sstevel@tonic-gate
727c478bd9Sstevel@tonic-gate if (iop->_base == 0) {
73*cd62a92dSRobert Mustacchi /* Get the buffer and end of buffer */
74*cd62a92dSRobert Mustacchi if ((endbuf = _findbuf(iop)) == 0) {
757c478bd9Sstevel@tonic-gate return (EOF);
76*cd62a92dSRobert Mustacchi }
77*cd62a92dSRobert Mustacchi } else {
787c478bd9Sstevel@tonic-gate endbuf = _bufend(iop);
79*cd62a92dSRobert Mustacchi }
807c478bd9Sstevel@tonic-gate
817c478bd9Sstevel@tonic-gate /*
827c478bd9Sstevel@tonic-gate * Flush all line-buffered streams before we
837c478bd9Sstevel@tonic-gate * read no-buffered or line-buffered input.
847c478bd9Sstevel@tonic-gate */
857c478bd9Sstevel@tonic-gate if (iop->_flag & (_IONBF | _IOLBF))
867c478bd9Sstevel@tonic-gate _flushlbf();
877c478bd9Sstevel@tonic-gate /*
887c478bd9Sstevel@tonic-gate * Changed the get family fns in Solaris 10 to comply with the
897c478bd9Sstevel@tonic-gate * 1990 C Standard and standards based upon it. If the
907c478bd9Sstevel@tonic-gate * end-of-file indicator for the stream is set, or if the stream
917c478bd9Sstevel@tonic-gate * is at end-of-file, the function will return EOF, and the file
927c478bd9Sstevel@tonic-gate * position indicator for the stream will not be advanced.
937c478bd9Sstevel@tonic-gate * Additional bytes appended to the file do not clear the EOF
947c478bd9Sstevel@tonic-gate * indicator.
957c478bd9Sstevel@tonic-gate */
967c478bd9Sstevel@tonic-gate if ((flag = iop->_flag) & _IOEOF) {
977c478bd9Sstevel@tonic-gate if (_xpg4_check()) {
987c478bd9Sstevel@tonic-gate /*
997c478bd9Sstevel@tonic-gate * A previous read() has returned 0 (below),
1007c478bd9Sstevel@tonic-gate * therefore iop->_cnt was set to 0, and the EOF
1017c478bd9Sstevel@tonic-gate * indicator was set before returning EOF. Reset
1027c478bd9Sstevel@tonic-gate * iop->_cnt to 0; it has likely been changed by
1037c478bd9Sstevel@tonic-gate * a function such as getc().
1047c478bd9Sstevel@tonic-gate */
1057c478bd9Sstevel@tonic-gate iop->_cnt = 0;
1067c478bd9Sstevel@tonic-gate return (EOF);
1077c478bd9Sstevel@tonic-gate }
1087c478bd9Sstevel@tonic-gate }
109*cd62a92dSRobert Mustacchi
1107c478bd9Sstevel@tonic-gate /*
1117c478bd9Sstevel@tonic-gate * Fill buffer or read 1 byte for unbuffered, handling any errors.
1127c478bd9Sstevel@tonic-gate */
1137c478bd9Sstevel@tonic-gate iop->_ptr = iop->_base;
1147c478bd9Sstevel@tonic-gate if (flag & _IONBF)
1157c478bd9Sstevel@tonic-gate nbyte = 1;
1167c478bd9Sstevel@tonic-gate else
1177c478bd9Sstevel@tonic-gate nbyte = endbuf - iop->_base;
118*cd62a92dSRobert Mustacchi if ((res = _xread(iop, (char *)iop->_base, nbyte)) > 0) {
1197c478bd9Sstevel@tonic-gate iop->_cnt = res - 1;
1207c478bd9Sstevel@tonic-gate return (*iop->_ptr++);
1217c478bd9Sstevel@tonic-gate }
122a574db85Sraf
123a574db85Sraf iop->_cnt = 0;
124a574db85Sraf if (res == 0)
125a574db85Sraf iop->_flag |= _IOEOF;
126a574db85Sraf else if (!cancel_active())
127a574db85Sraf iop->_flag |= _IOERR;
128a574db85Sraf return (EOF);
1297c478bd9Sstevel@tonic-gate }
130