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 5*7257d1b4Sraf * Common Development and Distribution License (the "License"). 6*7257d1b4Sraf * 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 */ 21*7257d1b4Sraf 227c478bd9Sstevel@tonic-gate /* 23*7257d1b4Sraf * 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 */ 287c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 297c478bd9Sstevel@tonic-gate 30*7257d1b4Sraf #pragma ident "%Z%%M% %I% %E% SMI" 317c478bd9Sstevel@tonic-gate 32*7257d1b4Sraf #include "lint.h" 337c478bd9Sstevel@tonic-gate #include "file64.h" 347c478bd9Sstevel@tonic-gate #include "mtlib.h" 357c478bd9Sstevel@tonic-gate #include <sys/types.h> 367c478bd9Sstevel@tonic-gate #include <stdio.h> 377c478bd9Sstevel@tonic-gate #include <thread.h> 387c478bd9Sstevel@tonic-gate #include <synch.h> 397c478bd9Sstevel@tonic-gate #include "stdiom.h" 407c478bd9Sstevel@tonic-gate 417c478bd9Sstevel@tonic-gate int _ungetc_unlocked(int c, FILE *iop); 427c478bd9Sstevel@tonic-gate 437c478bd9Sstevel@tonic-gate int 447c478bd9Sstevel@tonic-gate ungetc(int c, FILE *iop) 457c478bd9Sstevel@tonic-gate { 467c478bd9Sstevel@tonic-gate FLOCKRETURN(iop, _ungetc_unlocked(c, iop)) 477c478bd9Sstevel@tonic-gate } 487c478bd9Sstevel@tonic-gate 497c478bd9Sstevel@tonic-gate /* 507c478bd9Sstevel@tonic-gate * Called internally by the library (instead of the safe "ungetc") when 517c478bd9Sstevel@tonic-gate * iop->_lock is already held at a higher level - required since we do not 527c478bd9Sstevel@tonic-gate * have recursive locks. 537c478bd9Sstevel@tonic-gate */ 547c478bd9Sstevel@tonic-gate int 557c478bd9Sstevel@tonic-gate _ungetc_unlocked(int c, FILE *iop) 567c478bd9Sstevel@tonic-gate { 577c478bd9Sstevel@tonic-gate if (c == EOF) 587c478bd9Sstevel@tonic-gate return (EOF); 597c478bd9Sstevel@tonic-gate if (iop->_ptr <= iop->_base) { 607c478bd9Sstevel@tonic-gate if (iop->_base == 0) { 617c478bd9Sstevel@tonic-gate if (_findbuf(iop) == 0) 627c478bd9Sstevel@tonic-gate return (EOF); 637c478bd9Sstevel@tonic-gate } else if (iop->_ptr <= iop->_base - PUSHBACK) 647c478bd9Sstevel@tonic-gate return (EOF); 657c478bd9Sstevel@tonic-gate } 667c478bd9Sstevel@tonic-gate if ((iop->_flag & _IOREAD) == 0) /* basically a no-op on write stream */ 677c478bd9Sstevel@tonic-gate ++iop->_ptr; 687c478bd9Sstevel@tonic-gate if (*--iop->_ptr != (unsigned char) c) 697c478bd9Sstevel@tonic-gate *iop->_ptr = (unsigned char) c; /* was *--iop->_ptr = c; */ 707c478bd9Sstevel@tonic-gate ++iop->_cnt; 717c478bd9Sstevel@tonic-gate iop->_flag &= ~_IOEOF; 727c478bd9Sstevel@tonic-gate return (c); 737c478bd9Sstevel@tonic-gate } 74