1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 2005 Joerg Sonnenberger <joerg@bec.de>. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Chris Torek. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $DragonFly: src/lib/libc/stdio/priv_stdio.h,v 1.3 2005/08/02 00:44:39 joerg Exp $ 34 */ 35 36 #ifndef _LIBC_PRIV_STDIO_H_ 37 #define _LIBC_PRIV_STDIO_H_ 38 39 #include <pthread.h> 40 41 #include "wcio.h" 42 43 /* stdio buffers */ 44 struct __sbuf { 45 unsigned char *_base; 46 int _size; 47 }; 48 49 /* 50 * _ub, _up, and _ur are used when ungetc() pushes back more characters 51 * than fit in the current _bf, or when ungetc() pushes back a character 52 * that does not match the previous one in _bf. When this happens, 53 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff 54 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r. 55 */ 56 57 struct __FILE { 58 struct __FILE_public pub; 59 struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */ 60 61 /* operations */ 62 void *_cookie; /* cookie passed to io functions */ 63 int (*_close) (void *); 64 int (*_read) (void *, char *, int); 65 fpos_t (*_seek) (void *, fpos_t, int); 66 int (*_write) (void *, const char *, int); 67 68 /* separate buffer for long sequences of ungetc() */ 69 struct __sbuf _ub; /* ungetc buffer */ 70 int _ur; /* saved _r when _r is counting ungetc data */ 71 72 /* tricks to meet minimum requirements even when malloc() fails */ 73 unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */ 74 unsigned char _nbuf[1]; /* guarantee a getc() buffer */ 75 76 /* separate buffer for fgetln() when line crosses buffer boundary */ 77 struct __sbuf _lb; /* buffer for fgetln() */ 78 79 /* Unix stdio files get aligned to block boundaries on fseek() */ 80 int _blksize; /* stat.st_blksize (may be != _bf._size) */ 81 fpos_t _offset; /* current lseek offset (see WARNING) */ 82 83 unsigned char *_up; /* saved _p when _p is doing ungetc data */ 84 pthread_mutex_t fl_mutex; /* used for MT-safety */ 85 pthread_t fl_owner; /* current owner */ 86 int fl_count; /* recursive lock count */ 87 88 struct wchar_io_data _wcio; 89 }; 90 91 /* 92 * I/O descriptors for __sfvwrite(). 93 */ 94 struct __siov { 95 void *iov_base; 96 size_t iov_len; 97 }; 98 struct __suio { 99 struct __siov *uio_iov; 100 int uio_iovcnt; 101 int uio_resid; 102 }; 103 104 /* 105 * The first few FILEs are statically allocated; others are dynamically 106 * allocated and linked in via this glue structure. 107 */ 108 struct glue { 109 struct glue *next; 110 int niobs; 111 FILE *iobs; 112 }; 113 114 extern struct glue __sglue; 115 116 __BEGIN_DECLS 117 int __sfvwrite(FILE *, struct __suio *); 118 int __fflush(FILE *); 119 int __ungetc(int, FILE *); 120 __END_DECLS 121 122 #endif /* _LIBC_PRIV_STDIO_H_ */ 123