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 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include "lint.h" 30 #include "file64.h" 31 #include <sys/types.h> 32 #include <stdio.h> 33 #include <mtlib.h> 34 #include "stdiom.h" 35 #include <stdio_ext.h> 36 37 /* 38 * Returns non-zero if the file is open readonly, or if the last operation 39 * on the stream was a read e.g. fread() or fgetc(). Otherwise returns 0. 40 */ 41 int 42 __freading(FILE *stream) 43 { 44 return (stream->_flag & _IOREAD); 45 } 46 47 /* 48 * Returns non-zero if the file is open write-only or append-only, or if 49 * the last operation on the stream was a write e.g. fwrite() or fputc(). 50 * Otherwise returns 0. 51 */ 52 int 53 __fwriting(FILE *stream) 54 { 55 return (stream->_flag & _IOWRT); 56 } 57 58 /* 59 * Returns non-zero if it is possible to read from a stream. 60 */ 61 int 62 __freadable(FILE *stream) 63 { 64 return (stream->_flag & (_IOREAD|_IORW)); 65 } 66 67 /* 68 * Returns non-zero if it is possible to write on a stream. 69 */ 70 int 71 __fwritable(FILE *stream) 72 { 73 return (stream->_flag & (_IOWRT|_IORW)); 74 } 75 76 /* 77 * Returns non-zero if the stream is line buffered. 78 */ 79 int 80 __flbf(FILE *stream) 81 { 82 return (stream->_flag & _IOLBF); 83 } 84 85 /* 86 * Discard any pending buffered I/O. 87 */ 88 void 89 __fpurge(FILE *stream) 90 { 91 rmutex_t *lk; 92 93 FLOCKFILE(lk, stream); 94 if ((stream->_ptr = stream->_base) != NULL) 95 stream->_cnt = 0; 96 FUNLOCKFILE(lk); 97 } 98 99 /* 100 * Return the amount of output pending on a stream (in bytes). 101 */ 102 size_t 103 __fpending(FILE *stream) 104 { 105 size_t amount; 106 rmutex_t *lk; 107 108 FLOCKFILE(lk, stream); 109 amount = stream->_ptr - stream->_base; 110 FUNLOCKFILE(lk); 111 return (amount); 112 } 113 114 /* 115 * Returns the buffer size (in bytes) currently in use by the given stream. 116 */ 117 size_t 118 __fbufsize(FILE *stream) 119 { 120 size_t size; 121 rmutex_t *lk; 122 123 FLOCKFILE(lk, stream); 124 size = _bufend(stream) - stream->_base; 125 FUNLOCKFILE(lk); 126 return (size); 127 } 128