1 /* Implementation details of FILE streams. 2 Copyright (C) 2007-2008, 2010-2017 Free Software Foundation, Inc. 3 4 This program is free software: you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 3 of the License, or 7 (at your option) any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. 13 14 You should have received a copy of the GNU General Public License 15 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 16 17 /* Many stdio implementations have the same logic and therefore can share 18 the same implementation of stdio extension API, except that some fields 19 have different naming conventions, or their access requires some casts. */ 20 21 22 /* BSD stdio derived implementations. */ 23 24 #if defined __NetBSD__ /* NetBSD */ 25 /* Get __NetBSD_Version__. */ 26 # include <sys/param.h> 27 #endif 28 29 #include <errno.h> /* For detecting Plan9. */ 30 31 #if defined __sferror || defined __DragonFly__ || defined __ANDROID__ 32 /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Android */ 33 34 # if defined __DragonFly__ /* DragonFly */ 35 /* See <http://www.dragonflybsd.org/cvsweb/src/lib/libc/stdio/priv_stdio.h?rev=HEAD&content-type=text/x-cvsweb-markup>. */ 36 # define fp_ ((struct { struct __FILE_public pub; \ 37 struct { unsigned char *_base; int _size; } _bf; \ 38 void *cookie; \ 39 void *_close; \ 40 void *_read; \ 41 void *_seek; \ 42 void *_write; \ 43 struct { unsigned char *_base; int _size; } _ub; \ 44 int _ur; \ 45 unsigned char _ubuf[3]; \ 46 unsigned char _nbuf[1]; \ 47 struct { unsigned char *_base; int _size; } _lb; \ 48 int _blksize; \ 49 fpos_t _offset; \ 50 /* More fields, not relevant here. */ \ 51 } *) fp) 52 /* See <http://www.dragonflybsd.org/cvsweb/src/include/stdio.h?rev=HEAD&content-type=text/x-cvsweb-markup>. */ 53 # define _p pub._p 54 # define _flags pub._flags 55 # define _r pub._r 56 # define _w pub._w 57 # else 58 # define fp_ fp 59 # endif 60 61 # if (defined __NetBSD__ && __NetBSD_Version__ >= 105270000) || defined __OpenBSD__ || defined __ANDROID__ /* NetBSD >= 1.5ZA, OpenBSD, Android */ 62 /* See <http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> 63 and <http://www.openbsd.org/cgi-bin/cvsweb/src/lib/libc/stdio/fileext.h?rev=HEAD&content-type=text/x-cvsweb-markup> */ 64 struct __sfileext 65 { 66 struct __sbuf _ub; /* ungetc buffer */ 67 /* More fields, not relevant here. */ 68 }; 69 # define fp_ub ((struct __sfileext *) fp->_ext._base)->_ub 70 # else /* FreeBSD, NetBSD <= 1.5Z, DragonFly, Mac OS X, Cygwin, Android */ 71 # define fp_ub fp_->_ub 72 # endif 73 74 # define HASUB(fp) (fp_ub._base != NULL) 75 76 #endif 77 78 79 /* SystemV derived implementations. */ 80 81 #ifdef __TANDEM /* NonStop Kernel */ 82 # ifndef _IOERR 83 /* These values were determined by the program 'stdioext-flags' at 84 <http://lists.gnu.org/archive/html/bug-gnulib/2010-12/msg00165.html>. */ 85 # define _IOERR 0x40 86 # define _IOREAD 0x80 87 # define _IOWRT 0x4 88 # define _IORW 0x100 89 # endif 90 #endif 91 92 #if defined _IOERR 93 94 # if defined __sun && defined _LP64 /* Solaris/{SPARC,AMD64} 64-bit */ 95 # define fp_ ((struct { unsigned char *_ptr; \ 96 unsigned char *_base; \ 97 unsigned char *_end; \ 98 long _cnt; \ 99 int _file; \ 100 unsigned int _flag; \ 101 } *) fp) 102 # else 103 # define fp_ fp 104 # endif 105 106 # if defined _SCO_DS /* OpenServer */ 107 # define _cnt __cnt 108 # define _ptr __ptr 109 # define _base __base 110 # define _flag __flag 111 # endif 112 113 #elif (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ /* newer Windows with MSVC */ 114 115 /* <stdio.h> does not define the innards of FILE any more. */ 116 # define WINDOWS_OPAQUE_FILE 117 118 struct _gl_real_FILE 119 { 120 /* Note: Compared to older Windows and to mingw, it has the fields 121 _base and _cnt swapped. */ 122 unsigned char *_ptr; 123 unsigned char *_base; 124 int _cnt; 125 int _flag; 126 int _file; 127 int _charbuf; 128 int _bufsiz; 129 }; 130 # define fp_ ((struct _gl_real_FILE *) fp) 131 132 /* These values were determined by a program similar to the one at 133 <http://lists.gnu.org/archive/html/bug-gnulib/2010-12/msg00165.html>. */ 134 # define _IOREAD 0x1 135 # define _IOWRT 0x2 136 # define _IORW 0x4 137 # define _IOEOF 0x8 138 # define _IOERR 0x10 139 140 #endif 141