| 1 | /* Implementation details of FILE streams.
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| 2 | Copyright (C) 2007-2008, 2010-2022 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU Lesser General Public License as
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| 6 | published by the Free Software Foundation; either version 2.1 of the
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| 7 | License, or (at your option) any later version.
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| 8 |
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| 9 | This file is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU Lesser General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU Lesser General Public License
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| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | /* Many stdio implementations have the same logic and therefore can share
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| 18 | the same implementation of stdio extension API, except that some fields
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| 19 | have different naming conventions, or their access requires some casts. */
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| 20 |
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| 21 | /* Glibc 2.28 made _IO_UNBUFFERED and _IO_IN_BACKUP private. For now, work
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| 22 | around this problem by defining them ourselves. FIXME: Do not rely on glibc
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| 23 | internals. */
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| 24 | #if defined _IO_EOF_SEEN
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| 25 | # if !defined _IO_UNBUFFERED
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| 26 | # define _IO_UNBUFFERED 0x2
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| 27 | # endif
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| 28 | # if !defined _IO_IN_BACKUP
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| 29 | # define _IO_IN_BACKUP 0x100
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| 30 | # endif
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| 31 | #endif
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| 32 |
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| 33 | /* BSD stdio derived implementations. */
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| 34 |
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| 35 | #if defined __NetBSD__ /* NetBSD */
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| 36 | /* Get __NetBSD_Version__. */
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| 37 | # include <sys/param.h>
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| 38 | #endif
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| 39 |
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| 40 | #include <errno.h> /* For detecting Plan9. */
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| 41 |
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| 42 | #if defined __sferror || defined __DragonFly__ || defined __ANDROID__
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| 43 | /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */
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| 44 |
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| 45 | # if defined __DragonFly__ /* DragonFly */
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| 46 | /* See <https://gitweb.dragonflybsd.org/dragonfly.git/blob_plain/HEAD:/lib/libc/stdio/priv_stdio.h>. */
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| 47 | # define fp_ ((struct { struct __FILE_public pub; \
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| 48 | struct { unsigned char *_base; int _size; } _bf; \
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| 49 | void *cookie; \
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| 50 | void *_close; \
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| 51 | void *_read; \
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| 52 | void *_seek; \
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| 53 | void *_write; \
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| 54 | struct { unsigned char *_base; int _size; } _ub; \
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| 55 | int _ur; \
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| 56 | unsigned char _ubuf[3]; \
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| 57 | unsigned char _nbuf[1]; \
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| 58 | struct { unsigned char *_base; int _size; } _lb; \
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| 59 | int _blksize; \
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| 60 | fpos_t _offset; \
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| 61 | /* More fields, not relevant here. */ \
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| 62 | } *) fp)
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| 63 | /* See <https://gitweb.dragonflybsd.org/dragonfly.git/blob_plain/HEAD:/include/stdio.h>. */
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| 64 | # define _p pub._p
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| 65 | # define _flags pub._flags
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| 66 | # define _r pub._r
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| 67 | # define _w pub._w
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| 68 | # elif defined __ANDROID__ /* Android */
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| 69 | # ifdef __LP64__
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| 70 | # define _gl_flags_file_t int
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| 71 | # else
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| 72 | # define _gl_flags_file_t short
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| 73 | # endif
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| 74 | /* Up to this commit from 2015-10-12
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| 75 | <https://android.googlesource.com/platform/bionic.git/+/f0141dfab10a4b332769d52fa76631a64741297a>
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| 76 | the innards of FILE were public, and fp_ub could be defined like for OpenBSD,
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| 77 | see <https://android.googlesource.com/platform/bionic.git/+/e78392637d5086384a5631ddfdfa8d7ec8326ee3/libc/stdio/fileext.h>
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| 78 | and <https://android.googlesource.com/platform/bionic.git/+/e78392637d5086384a5631ddfdfa8d7ec8326ee3/libc/stdio/local.h>.
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| 79 | After this commit, the innards of FILE are hidden. */
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| 80 | # define fp_ ((struct { unsigned char *_p; \
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| 81 | int _r; \
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| 82 | int _w; \
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| 83 | _gl_flags_file_t _flags; \
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| 84 | _gl_flags_file_t _file; \
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| 85 | struct { unsigned char *_base; size_t _size; } _bf; \
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| 86 | int _lbfsize; \
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| 87 | void *_cookie; \
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| 88 | void *_close; \
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| 89 | void *_read; \
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| 90 | void *_seek; \
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| 91 | void *_write; \
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| 92 | struct { unsigned char *_base; size_t _size; } _ext; \
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| 93 | unsigned char *_up; \
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| 94 | int _ur; \
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| 95 | unsigned char _ubuf[3]; \
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| 96 | unsigned char _nbuf[1]; \
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| 97 | struct { unsigned char *_base; size_t _size; } _lb; \
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| 98 | int _blksize; \
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| 99 | fpos_t _offset; \
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| 100 | /* More fields, not relevant here. */ \
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| 101 | } *) fp)
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| 102 | # else
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| 103 | # define fp_ fp
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| 104 | # endif
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| 105 |
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| 106 | # if (defined __NetBSD__ && __NetBSD_Version__ >= 105270000) || defined __OpenBSD__ || defined __minix /* NetBSD >= 1.5ZA, OpenBSD, Minix 3 */
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| 107 | /* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>
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| 108 | and <https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup>
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| 109 | and <https://github.com/Stichting-MINIX-Research-Foundation/minix/blob/master/lib/libc/stdio/fileext.h> */
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| 110 | struct __sfileext
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| 111 | {
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| 112 | struct __sbuf _ub; /* ungetc buffer */
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| 113 | /* More fields, not relevant here. */
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| 114 | };
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| 115 | # define fp_ub ((struct __sfileext *) fp->_ext._base)->_ub
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| 116 | # elif defined __ANDROID__ /* Android */
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| 117 | struct __sfileext
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| 118 | {
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| 119 | struct { unsigned char *_base; size_t _size; } _ub; /* ungetc buffer */
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| 120 | /* More fields, not relevant here. */
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| 121 | };
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| 122 | # define fp_ub ((struct __sfileext *) fp_->_ext._base)->_ub
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| 123 | # else /* FreeBSD, NetBSD <= 1.5Z, DragonFly, Mac OS X, Cygwin */
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| 124 | # define fp_ub fp_->_ub
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| 125 | # endif
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| 126 |
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| 127 | # define HASUB(fp) (fp_ub._base != NULL)
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| 128 |
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| 129 | # if defined __ANDROID__ /* Android */
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| 130 | /* Needed after this commit from 2016-01-25
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| 131 | <https://android.googlesource.com/platform/bionic.git/+/e70e0e9267d069bf56a5078c99307e08a7280de7> */
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| 132 | # ifndef __SEOF
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| 133 | # define __SLBF 1
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| 134 | # define __SNBF 2
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| 135 | # define __SRD 4
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| 136 | # define __SWR 8
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| 137 | # define __SRW 0x10
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| 138 | # define __SEOF 0x20
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| 139 | # define __SERR 0x40
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| 140 | # endif
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| 141 | # ifndef __SOFF
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| 142 | # define __SOFF 0x1000
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| 143 | # endif
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| 144 | # endif
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| 145 |
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| 146 | #endif
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| 147 |
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| 148 |
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| 149 | /* SystemV derived implementations. */
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| 150 |
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| 151 | #ifdef __TANDEM /* NonStop Kernel */
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| 152 | # ifndef _IOERR
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| 153 | /* These values were determined by the program 'stdioext-flags' at
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| 154 | <https://lists.gnu.org/r/bug-gnulib/2010-12/msg00165.html>. */
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| 155 | # define _IOERR 0x40
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| 156 | # define _IOREAD 0x80
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| 157 | # define _IOWRT 0x4
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| 158 | # define _IORW 0x100
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| 159 | # endif
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| 160 | #endif
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| 161 |
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| 162 | #if defined _IOERR
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| 163 |
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| 164 | # if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
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| 165 | # define fp_ ((struct { unsigned char *_ptr; \
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| 166 | unsigned char *_base; \
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| 167 | unsigned char *_end; \
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| 168 | long _cnt; \
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| 169 | int _file; \
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| 170 | unsigned int _flag; \
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| 171 | } *) fp)
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| 172 | # elif defined __VMS /* OpenVMS */
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| 173 | # define fp_ ((struct _iobuf *) fp)
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| 174 | # else
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| 175 | # define fp_ fp
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| 176 | # endif
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| 177 |
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| 178 | # if defined _SCO_DS || (defined __SCO_VERSION__ || defined __sysv5__) /* OpenServer 5, OpenServer 6, UnixWare 7 */
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| 179 | # define _cnt __cnt
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| 180 | # define _ptr __ptr
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| 181 | # define _base __base
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| 182 | # define _flag __flag
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| 183 | # endif
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| 184 |
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| 185 | #elif defined _WIN32 && ! defined __CYGWIN__ /* newer Windows with MSVC */
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| 186 |
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| 187 | /* <stdio.h> does not define the innards of FILE any more. */
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| 188 | # define WINDOWS_OPAQUE_FILE
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| 189 |
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| 190 | struct _gl_real_FILE
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| 191 | {
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| 192 | /* Note: Compared to older Windows and to mingw, it has the fields
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| 193 | _base and _cnt swapped. */
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| 194 | unsigned char *_ptr;
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| 195 | unsigned char *_base;
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| 196 | int _cnt;
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| 197 | int _flag;
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| 198 | int _file;
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| 199 | int _charbuf;
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| 200 | int _bufsiz;
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| 201 | };
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| 202 | # define fp_ ((struct _gl_real_FILE *) fp)
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| 203 |
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| 204 | /* These values were determined by a program similar to the one at
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| 205 | <https://lists.gnu.org/r/bug-gnulib/2010-12/msg00165.html>. */
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| 206 | # define _IOREAD 0x1
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| 207 | # define _IOWRT 0x2
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| 208 | # define _IORW 0x4
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| 209 | # define _IOEOF 0x8
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| 210 | # define _IOERR 0x10
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| 211 |
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| 212 | #endif
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