1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #include "lint.h" 28 #include "file64.h" 29 #include <sys/types.h> 30 #include <stdio.h> 31 #include <mtlib.h> 32 #include "stdiom.h" 33 #include <stdio_ext.h> 34 35 /* 36 * Returns non-zero if the file is open readonly, or if the last operation 37 * on the stream was a read e.g. fread() or fgetc(). Otherwise returns 0. 38 */ 39 int 40 __freading(FILE *stream) 41 { 42 return (stream->_flag & _IOREAD); 43 } 44 45 /* 46 * Returns non-zero if the file is open write-only or append-only, or if 47 * the last operation on the stream was a write e.g. fwrite() or fputc(). 48 * Otherwise returns 0. 49 */ 50 int 51 __fwriting(FILE *stream) 52 { 53 return (stream->_flag & _IOWRT); 54 } 55 56 /* 57 * Returns non-zero if it is possible to read from a stream. 58 */ 59 int 60 __freadable(FILE *stream) 61 { 62 return (stream->_flag & (_IOREAD|_IORW)); 63 } 64 65 /* 66 * Returns non-zero if it is possible to write on a stream. 67 */ 68 int 69 __fwritable(FILE *stream) 70 { 71 return (stream->_flag & (_IOWRT|_IORW)); 72 } 73 74 /* 75 * Returns non-zero if the stream is line buffered. 76 */ 77 int 78 __flbf(FILE *stream) 79 { 80 return (stream->_flag & _IOLBF); 81 } 82 83 /* 84 * Discard any pending buffered I/O. 85 */ 86 void 87 __fpurge(FILE *stream) 88 { 89 rmutex_t *lk; 90 91 FLOCKFILE(lk, stream); 92 if ((stream->_ptr = stream->_base) != NULL) 93 stream->_cnt = 0; 94 FUNLOCKFILE(lk); 95 } 96 97 /* 98 * Return the amount of output pending on a stream (in bytes). 99 */ 100 size_t 101 __fpending(FILE *stream) 102 { 103 size_t amount; 104 rmutex_t *lk; 105 106 FLOCKFILE(lk, stream); 107 amount = stream->_ptr - stream->_base; 108 FUNLOCKFILE(lk); 109 return (amount); 110 } 111 112 /* 113 * Returns the buffer size (in bytes) currently in use by the given stream. 114 */ 115 size_t 116 __fbufsize(FILE *stream) 117 { 118 size_t size; 119 rmutex_t *lk; 120 121 FLOCKFILE(lk, stream); 122 size = _bufend(stream) - stream->_base; 123 FUNLOCKFILE(lk); 124 return (size); 125 } 126