218 lines
8.1 KiB
C
218 lines
8.1 KiB
C
/* Implementation details of FILE streams.
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Copyright (C) 2007-2008, 2010-2023 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Many stdio implementations have the same logic and therefore can share
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the same implementation of stdio extension API, except that some fields
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have different naming conventions, or their access requires some casts. */
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/* Glibc 2.28 made _IO_UNBUFFERED and _IO_IN_BACKUP private. For now, work
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around this problem by defining them ourselves. FIXME: Do not rely on glibc
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internals. */
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#if defined _IO_EOF_SEEN
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# if !defined _IO_UNBUFFERED
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# define _IO_UNBUFFERED 0x2
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# endif
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# if !defined _IO_IN_BACKUP
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# define _IO_IN_BACKUP 0x100
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# endif
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#endif
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/* BSD stdio derived implementations. */
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#if defined __NetBSD__ /* NetBSD */
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/* Get __NetBSD_Version__. */
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# include <sys/param.h>
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#endif
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#include <errno.h> /* For detecting Plan9. */
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#if defined __sferror || defined __DragonFly__ || defined __ANDROID__
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/* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */
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# if defined __DragonFly__ /* DragonFly */
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/* See <https://gitweb.dragonflybsd.org/dragonfly.git/blob_plain/HEAD:/lib/libc/stdio/priv_stdio.h>. */
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# define fp_ ((struct { struct __FILE_public pub; \
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struct { unsigned char *_base; int _size; } _bf; \
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void *cookie; \
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void *_close; \
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void *_read; \
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void *_seek; \
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void *_write; \
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struct { unsigned char *_base; int _size; } _ub; \
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int _ur; \
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unsigned char _ubuf[3]; \
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unsigned char _nbuf[1]; \
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struct { unsigned char *_base; int _size; } _lb; \
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int _blksize; \
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fpos_t _offset; \
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/* More fields, not relevant here. */ \
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} *) fp)
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/* See <https://gitweb.dragonflybsd.org/dragonfly.git/blob_plain/HEAD:/include/stdio.h>. */
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# define _p pub._p
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# define _flags pub._flags
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# define _r pub._r
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# define _w pub._w
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# elif defined __ANDROID__ /* Android */
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# ifdef __LP64__
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# define _gl_flags_file_t int
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# else
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# define _gl_flags_file_t short
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# endif
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# ifdef __LP64__
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# define _gl_file_offset_t int64_t
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# else
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/* see https://android.googlesource.com/platform/bionic/+/master/docs/32-bit-abi.md */
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# define _gl_file_offset_t __kernel_off_t
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# endif
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/* Up to this commit from 2015-10-12
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<https://android.googlesource.com/platform/bionic.git/+/f0141dfab10a4b332769d52fa76631a64741297a>
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the innards of FILE were public, and fp_ub could be defined like for OpenBSD,
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see <https://android.googlesource.com/platform/bionic.git/+/e78392637d5086384a5631ddfdfa8d7ec8326ee3/libc/stdio/fileext.h>
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and <https://android.googlesource.com/platform/bionic.git/+/e78392637d5086384a5631ddfdfa8d7ec8326ee3/libc/stdio/local.h>.
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After this commit, the innards of FILE are hidden. */
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# define fp_ ((struct { unsigned char *_p; \
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int _r; \
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int _w; \
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_gl_flags_file_t _flags; \
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_gl_flags_file_t _file; \
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struct { unsigned char *_base; size_t _size; } _bf; \
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int _lbfsize; \
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void *_cookie; \
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void *_close; \
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void *_read; \
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void *_seek; \
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void *_write; \
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struct { unsigned char *_base; size_t _size; } _ext; \
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unsigned char *_up; \
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int _ur; \
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unsigned char _ubuf[3]; \
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unsigned char _nbuf[1]; \
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struct { unsigned char *_base; size_t _size; } _lb; \
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int _blksize; \
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_gl_file_offset_t _offset; \
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/* More fields, not relevant here. */ \
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} *) fp)
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# else
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# define fp_ fp
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# endif
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# if (defined __NetBSD__ && __NetBSD_Version__ >= 105270000) || defined __OpenBSD__ || defined __minix /* NetBSD >= 1.5ZA, OpenBSD, Minix 3 */
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/* 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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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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and <https://github.com/Stichting-MINIX-Research-Foundation/minix/blob/master/lib/libc/stdio/fileext.h> */
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struct __sfileext
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{
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struct __sbuf _ub; /* ungetc buffer */
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/* More fields, not relevant here. */
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};
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# define fp_ub ((struct __sfileext *) fp->_ext._base)->_ub
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# elif defined __ANDROID__ /* Android */
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struct __sfileext
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{
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struct { unsigned char *_base; size_t _size; } _ub; /* ungetc buffer */
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/* More fields, not relevant here. */
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};
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# define fp_ub ((struct __sfileext *) fp_->_ext._base)->_ub
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# else /* FreeBSD, NetBSD <= 1.5Z, DragonFly, Mac OS X, Cygwin */
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# define fp_ub fp_->_ub
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# endif
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# define HASUB(fp) (fp_ub._base != NULL)
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# if defined __ANDROID__ /* Android */
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/* Needed after this commit from 2016-01-25
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<https://android.googlesource.com/platform/bionic.git/+/e70e0e9267d069bf56a5078c99307e08a7280de7> */
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# ifndef __SEOF
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# define __SLBF 1
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# define __SNBF 2
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# define __SRD 4
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# define __SWR 8
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# define __SRW 0x10
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# define __SEOF 0x20
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# define __SERR 0x40
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# endif
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# ifndef __SOFF
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# define __SOFF 0x1000
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# endif
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# endif
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#endif
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/* SystemV derived implementations. */
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#ifdef __TANDEM /* NonStop Kernel */
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# ifndef _IOERR
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/* These values were determined by the program 'stdioext-flags' at
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<https://lists.gnu.org/r/bug-gnulib/2010-12/msg00165.html>. */
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# define _IOERR 0x40
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# define _IOREAD 0x80
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# define _IOWRT 0x4
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# define _IORW 0x100
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# endif
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#endif
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#if defined _IOERR
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# if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */
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# define fp_ ((struct { unsigned char *_ptr; \
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unsigned char *_base; \
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unsigned char *_end; \
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long _cnt; \
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int _file; \
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unsigned int _flag; \
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} *) fp)
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# elif defined __VMS /* OpenVMS */
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# define fp_ ((struct _iobuf *) fp)
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# else
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# define fp_ fp
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# endif
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# if defined _SCO_DS || (defined __SCO_VERSION__ || defined __sysv5__) /* OpenServer 5, OpenServer 6, UnixWare 7 */
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# define _cnt __cnt
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# define _ptr __ptr
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# define _base __base
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# define _flag __flag
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# endif
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#elif defined _WIN32 && ! defined __CYGWIN__ /* newer Windows with MSVC */
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/* <stdio.h> does not define the innards of FILE any more. */
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# define WINDOWS_OPAQUE_FILE
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struct _gl_real_FILE
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{
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/* Note: Compared to older Windows and to mingw, it has the fields
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_base and _cnt swapped. */
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unsigned char *_ptr;
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unsigned char *_base;
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int _cnt;
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int _flag;
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int _file;
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int _charbuf;
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int _bufsiz;
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};
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# define fp_ ((struct _gl_real_FILE *) fp)
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/* These values were determined by a program similar to the one at
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<https://lists.gnu.org/r/bug-gnulib/2010-12/msg00165.html>. */
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# define _IOREAD 0x1
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# define _IOWRT 0x2
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# define _IORW 0x4
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# define _IOEOF 0x8
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# define _IOERR 0x10
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#endif
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