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.
6 * This code is derived from software contributed to Berkeley by
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10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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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.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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33 * $DragonFly: src/lib/libc/stdio/priv_stdio.h,v 1.2 2005/07/23 23:14:44 joerg Exp $
36 #ifndef _LIBC_PRIV_STDIO_H_
37 #define _LIBC_PRIV_STDIO_H_
48 * _ub, _up, and _ur are used when ungetc() pushes back more characters
49 * than fit in the current _bf, or when ungetc() pushes back a character
50 * that does not match the previous one in _bf. When this happens,
51 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
52 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
56 struct __FILE_public pub;
57 struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
60 void *_cookie; /* cookie passed to io functions */
61 int (*_close) (void *);
62 int (*_read) (void *, char *, int);
63 fpos_t (*_seek) (void *, fpos_t, int);
64 int (*_write) (void *, const char *, int);
66 /* separate buffer for long sequences of ungetc() */
67 struct __sbuf _ub; /* ungetc buffer */
68 int _ur; /* saved _r when _r is counting ungetc data */
70 /* tricks to meet minimum requirements even when malloc() fails */
71 unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */
72 unsigned char _nbuf[1]; /* guarantee a getc() buffer */
74 /* separate buffer for fgetln() when line crosses buffer boundary */
75 struct __sbuf _lb; /* buffer for fgetln() */
77 /* Unix stdio files get aligned to block boundaries on fseek() */
78 int _blksize; /* stat.st_blksize (may be != _bf._size) */
79 fpos_t _offset; /* current lseek offset (see WARNING) */
81 unsigned char *_up; /* saved _p when _p is doing ungetc data */
82 pthread_mutex_t fl_mutex; /* used for MT-safety */
83 pthread_t fl_owner; /* current owner */
84 int fl_count; /* recursive lock count */
88 * I/O descriptors for __sfvwrite().
95 struct __siov *uio_iov;
101 * The first few FILEs are statically allocated; others are dynamically
102 * allocated and linked in via this glue structure.
110 extern struct glue __sglue;
113 int __sfvwrite(FILE *, struct __suio *);
114 int __fflush(FILE *);
115 int __ungetc(int, FILE *);
118 #endif /* _LIBC_PRIV_STDIO_H_ */