11dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* $OpenBSD: refill.c,v 1.8 2005/08/08 08:05:36 espie Exp $ */ 21dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/*- 31dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Copyright (c) 1990, 1993 41dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * The Regents of the University of California. All rights reserved. 51dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 61dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * This code is derived from software contributed to Berkeley by 71dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Chris Torek. 81dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 91dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Redistribution and use in source and binary forms, with or without 101dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * modification, are permitted provided that the following conditions 111dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * are met: 121dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 1. Redistributions of source code must retain the above copyright 131dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer. 141dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 2. Redistributions in binary form must reproduce the above copyright 151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * notice, this list of conditions and the following disclaimer in the 161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * documentation and/or other materials provided with the distribution. 171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 3. Neither the name of the University nor the names of its contributors 181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * may be used to endorse or promote products derived from this software 191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * without specific prior written permission. 201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * 211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * SUCH DAMAGE. 321dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 331dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 341dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <errno.h> 351dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdio.h> 361dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include <stdlib.h> 371dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project#include "local.h" 381dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 391dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectstatic int 401dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectlflush(FILE *fp) 411dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 421dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR)) 43f582340a6a48588aa50da17e1620e8f91b146941Kenny Root return (__sflush_locked(fp)); /* ignored... */ 441dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return (0); 451dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 461dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 471dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project/* 481dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Refill a stdio buffer. 491dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Return EOF on eof or error, 0 otherwise. 501dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 511dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Projectint 521dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project__srefill(FILE *fp) 531dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project{ 541dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 551dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* make sure stdio is set up */ 561dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (!__sdidinit) 571dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project __sinit(); 581dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 591dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fp->_r = 0; /* largely a convenience for callers */ 601dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 611dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* SysV does not make this test; take it out for compatibility */ 621dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (fp->_flags & __SEOF) 631dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return (EOF); 641dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 651dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* if not already reading, have to be reading and writing */ 661dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if ((fp->_flags & __SRD) == 0) { 671dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if ((fp->_flags & __SRW) == 0) { 681dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project errno = EBADF; 691dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fp->_flags |= __SERR; 701dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return (EOF); 711dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 721dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* switch to reading */ 731dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (fp->_flags & __SWR) { 741dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (__sflush(fp)) 751dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return (EOF); 761dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fp->_flags &= ~__SWR; 771dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fp->_w = 0; 781dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fp->_lbfsize = 0; 791dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 801dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fp->_flags |= __SRD; 811dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } else { 821dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* 831dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * We were reading. If there is an ungetc buffer, 841dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * we must have been reading from that. Drop it, 851dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * restoring the previous buffer (if any). If there 861dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * is anything in that buffer, return. 871dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 881dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (HASUB(fp)) { 891dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project FREEUB(fp); 901dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if ((fp->_r = fp->_ur) != 0) { 911dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fp->_p = fp->_up; 921dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return (0); 931dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 941dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 951dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 961dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 971dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (fp->_bf._base == NULL) 981dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project __smakebuf(fp); 991dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project 1001dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project /* 1011dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * Before reading from a line buffered or unbuffered file, 1021dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * flush all line buffered output files, per the ANSI C 1031dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project * standard. 1041dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project */ 105f582340a6a48588aa50da17e1620e8f91b146941Kenny Root if (fp->_flags & (__SLBF|__SNBF)) { 106f582340a6a48588aa50da17e1620e8f91b146941Kenny Root /* Ignore this file in _fwalk to avoid potential deadlock. */ 107f582340a6a48588aa50da17e1620e8f91b146941Kenny Root fp->_flags |= __SIGN; 1081dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project (void) _fwalk(lflush); 109f582340a6a48588aa50da17e1620e8f91b146941Kenny Root fp->_flags &= ~__SIGN; 110f582340a6a48588aa50da17e1620e8f91b146941Kenny Root 111f582340a6a48588aa50da17e1620e8f91b146941Kenny Root /* Now flush this file without locking it. */ 112f582340a6a48588aa50da17e1620e8f91b146941Kenny Root if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR)) 113f582340a6a48588aa50da17e1620e8f91b146941Kenny Root __sflush(fp); 114f582340a6a48588aa50da17e1620e8f91b146941Kenny Root } 1151dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fp->_p = fp->_bf._base; 1161dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fp->_r = (*fp->_read)(fp->_cookie, (char *)fp->_p, fp->_bf._size); 1171dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fp->_flags &= ~__SMOD; /* buffer contents are again pristine */ 1181dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (fp->_r <= 0) { 1191dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project if (fp->_r == 0) 1201dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fp->_flags |= __SEOF; 1211dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project else { 1221dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fp->_r = 0; 1231dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project fp->_flags |= __SERR; 1241dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1251dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return (EOF); 1261dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project } 1271dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project return (0); 1281dc9e472e19acfe6dc7f41e429236e7eef7ceda1The Android Open Source Project} 129