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 /* 44 * NB: to fit things in six character monocase externals, the stdio 45 * code uses the prefix `__s' for stdio objects, typically followed 46 * by a three-character attempt at a mnemonic. 47 */ 48 49 /* stdio buffers */ 50 struct __sbuf { 51 unsigned char *_base; 52 int _size; 53 }; 54 55 /* 56 * _ub, _up, and _ur are used when ungetc() pushes back more characters 57 * than fit in the current _bf, or when ungetc() pushes back a character 58 * that does not match the previous one in _bf. When this happens, 59 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff 60 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r. 61 */ 62 63 struct __FILE { 64 struct __FILE_public pub; 65 struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */ 66 67 /* operations */ 68 void *_cookie; /* cookie passed to io functions */ 69 int (*_close)(void *); 70 int (*_read)(void *, char *, int); 71 fpos_t (*_seek)(void *, fpos_t, int); 72 int (*_write)(void *, const char *, int); 73 74 /* separate buffer for long sequences of ungetc() */ 75 struct __sbuf _ub; /* ungetc buffer */ 76 int _ur; /* saved _r when _r is counting ungetc data */ 77 78 /* tricks to meet minimum requirements even when malloc() fails */ 79 unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */ 80 unsigned char _nbuf[1]; /* guarantee a getc() buffer */ 81 82 /* separate buffer for fgetln() when line crosses buffer boundary */ 83 struct __sbuf _lb; /* buffer for fgetln() */ 84 85 /* Unix stdio files get aligned to block boundaries on fseek() */ 86 int _blksize; /* stat.st_blksize (may be != _bf._size) */ 87 fpos_t _offset; /* current lseek offset (see WARNING) */ 88 89 unsigned char *_up; /* saved _p when _p is doing ungetc data */ 90 pthread_mutex_t _fl_mutex; /* used for MT-safety */ 91 pthread_t _fl_owner; /* current owner */ 92 int _fl_count; /* recursive lock count */ 93 94 struct wchar_io_data _wcio; 95 }; 96 97 /* 98 * I/O descriptors for __sfvwrite(). 99 */ 100 struct __siov { 101 void *iov_base; 102 size_t iov_len; 103 }; 104 struct __suio { 105 struct __siov *uio_iov; 106 int uio_iovcnt; 107 int uio_resid; 108 }; 109 110 /* 111 * The first few FILEs are statically allocated; others are dynamically 112 * allocated and linked in via this glue structure. 113 */ 114 struct glue { 115 struct glue *next; 116 int niobs; 117 FILE *iobs; 118 }; 119 120 extern struct glue __sglue; 121 122 __BEGIN_DECLS 123 int __sfvwrite(FILE *, struct __suio *); 124 int __fflush(FILE *); 125 int __ungetc(int, FILE *); 126 __END_DECLS 127 128 #endif /* _LIBC_PRIV_STDIO_H_ */ 129