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Diffstat (limited to 'REORG.TODO/libio/libioP.h')
| -rw-r--r-- | REORG.TODO/libio/libioP.h | 944 |
1 files changed, 944 insertions, 0 deletions
diff --git a/REORG.TODO/libio/libioP.h b/REORG.TODO/libio/libioP.h new file mode 100644 index 0000000000..eb93418c8d --- /dev/null +++ b/REORG.TODO/libio/libioP.h @@ -0,0 +1,944 @@ +/* Copyright (C) 1993-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. + + As a special exception, if you link the code in this file with + files compiled with a GNU compiler to produce an executable, + that does not cause the resulting executable to be covered by + the GNU Lesser General Public License. This exception does not + however invalidate any other reasons why the executable file + might be covered by the GNU Lesser General Public License. + This exception applies to code released by its copyright holders + in files containing the exception. */ + +/* NOTE: libio is now exclusively used only by glibc since libstdc++ has its + own implementation. As a result, functions that were implemented for C++ + (like *sputn) may no longer have C++ semantics. This is of course only + relevant for internal callers of these functions since these functions are + not intended for external use otherwise. + + FIXME: All of the C++ cruft eventually needs to go away. */ + +#include <stddef.h> + +#include <errno.h> +#ifndef __set_errno +# define __set_errno(Val) errno = (Val) +#endif +#if defined __GLIBC__ && __GLIBC__ >= 2 +# include <libc-lock.h> +#else +/*# include <comthread.h>*/ +#endif + +#include <math_ldbl_opt.h> + +#include "iolibio.h" + +/* Control of exported symbols. Used in glibc. By default we don't + do anything. */ +#ifndef libc_hidden_proto +# define libc_hidden_proto(name) +#endif +#ifndef libc_hidden_def +# define libc_hidden_def(name) +#endif +#ifndef libc_hidden_weak +# define libc_hidden_weak(name) +#endif + +#ifdef __cplusplus +extern "C" { +#endif + +#define _IO_seek_set 0 +#define _IO_seek_cur 1 +#define _IO_seek_end 2 + +/* THE JUMPTABLE FUNCTIONS. + + * The _IO_FILE type is used to implement the FILE type in GNU libc, + * as well as the streambuf class in GNU iostreams for C++. + * These are all the same, just used differently. + * An _IO_FILE (or FILE) object is allows followed by a pointer to + * a jump table (of pointers to functions). The pointer is accessed + * with the _IO_JUMPS macro. The jump table has an eccentric format, + * so as to be compatible with the layout of a C++ virtual function table. + * (as implemented by g++). When a pointer to a streambuf object is + * coerced to an (_IO_FILE*), then _IO_JUMPS on the result just + * happens to point to the virtual function table of the streambuf. + * Thus the _IO_JUMPS function table used for C stdio/libio does + * double duty as the virtual function table for C++ streambuf. + * + * The entries in the _IO_JUMPS function table (and hence also the + * virtual functions of a streambuf) are described below. + * The first parameter of each function entry is the _IO_FILE/streambuf + * object being acted on (i.e. the 'this' parameter). + */ + +#ifdef _LIBC +# include <shlib-compat.h> +# if !SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) + /* Setting this macro disables the use of the _vtable_offset + bias in _IO_JUMPS_FUNCS, below. That is only needed if we + want to support old binaries (see oldfileops.c). */ +# define _G_IO_NO_BACKWARD_COMPAT 1 +# endif +#endif + +#if (!defined _IO_USE_OLD_IO_FILE \ + && (!defined _G_IO_NO_BACKWARD_COMPAT || _G_IO_NO_BACKWARD_COMPAT == 0)) +# define _IO_JUMPS_OFFSET 1 +#else +# define _IO_JUMPS_OFFSET 0 +#endif + +/* Type of MEMBER in struct type TYPE. */ +#define _IO_MEMBER_TYPE(TYPE, MEMBER) __typeof__ (((TYPE){}).MEMBER) + +/* Essentially ((TYPE *) THIS)->MEMBER, but avoiding the aliasing + violation in case THIS has a different pointer type. */ +#define _IO_CAST_FIELD_ACCESS(THIS, TYPE, MEMBER) \ + (*(_IO_MEMBER_TYPE (TYPE, MEMBER) *)(((char *) (THIS)) \ + + offsetof(TYPE, MEMBER))) + +#define _IO_JUMPS(THIS) (THIS)->vtable +#define _IO_JUMPS_FILE_plus(THIS) \ + _IO_CAST_FIELD_ACCESS ((THIS), struct _IO_FILE_plus, vtable) +#define _IO_WIDE_JUMPS(THIS) \ + _IO_CAST_FIELD_ACCESS ((THIS), struct _IO_FILE, _wide_data)->_wide_vtable +#define _IO_CHECK_WIDE(THIS) \ + (_IO_CAST_FIELD_ACCESS ((THIS), struct _IO_FILE, _wide_data) != NULL) + +#if _IO_JUMPS_OFFSET +# define _IO_JUMPS_FUNC(THIS) \ + (IO_validate_vtable \ + (*(struct _IO_jump_t **) ((void *) &_IO_JUMPS_FILE_plus (THIS) \ + + (THIS)->_vtable_offset))) +# define _IO_vtable_offset(THIS) (THIS)->_vtable_offset +#else +# define _IO_JUMPS_FUNC(THIS) (IO_validate_vtable (_IO_JUMPS_FILE_plus (THIS))) +# define _IO_vtable_offset(THIS) 0 +#endif +#define _IO_WIDE_JUMPS_FUNC(THIS) _IO_WIDE_JUMPS(THIS) +#define JUMP_FIELD(TYPE, NAME) TYPE NAME +#define JUMP0(FUNC, THIS) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS) +#define JUMP1(FUNC, THIS, X1) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS, X1) +#define JUMP2(FUNC, THIS, X1, X2) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS, X1, X2) +#define JUMP3(FUNC, THIS, X1,X2,X3) (_IO_JUMPS_FUNC(THIS)->FUNC) (THIS, X1,X2, X3) +#define JUMP_INIT(NAME, VALUE) VALUE +#define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0), JUMP_INIT (dummy2, 0) + +#define WJUMP0(FUNC, THIS) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS) +#define WJUMP1(FUNC, THIS, X1) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS, X1) +#define WJUMP2(FUNC, THIS, X1, X2) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS, X1, X2) +#define WJUMP3(FUNC, THIS, X1,X2,X3) (_IO_WIDE_JUMPS_FUNC(THIS)->FUNC) (THIS, X1,X2, X3) + +/* The 'finish' function does any final cleaning up of an _IO_FILE object. + It does not delete (free) it, but does everything else to finalize it. + It matches the streambuf::~streambuf virtual destructor. */ +typedef void (*_IO_finish_t) (_IO_FILE *, int); /* finalize */ +#define _IO_FINISH(FP) JUMP1 (__finish, FP, 0) +#define _IO_WFINISH(FP) WJUMP1 (__finish, FP, 0) + +/* The 'overflow' hook flushes the buffer. + The second argument is a character, or EOF. + It matches the streambuf::overflow virtual function. */ +typedef int (*_IO_overflow_t) (_IO_FILE *, int); +#define _IO_OVERFLOW(FP, CH) JUMP1 (__overflow, FP, CH) +#define _IO_WOVERFLOW(FP, CH) WJUMP1 (__overflow, FP, CH) + +/* The 'underflow' hook tries to fills the get buffer. + It returns the next character (as an unsigned char) or EOF. The next + character remains in the get buffer, and the get position is not changed. + It matches the streambuf::underflow virtual function. */ +typedef int (*_IO_underflow_t) (_IO_FILE *); +#define _IO_UNDERFLOW(FP) JUMP0 (__underflow, FP) +#define _IO_WUNDERFLOW(FP) WJUMP0 (__underflow, FP) + +/* The 'uflow' hook returns the next character in the input stream + (cast to unsigned char), and increments the read position; + EOF is returned on failure. + It matches the streambuf::uflow virtual function, which is not in the + cfront implementation, but was added to C++ by the ANSI/ISO committee. */ +#define _IO_UFLOW(FP) JUMP0 (__uflow, FP) +#define _IO_WUFLOW(FP) WJUMP0 (__uflow, FP) + +/* The 'pbackfail' hook handles backing up. + It matches the streambuf::pbackfail virtual function. */ +typedef int (*_IO_pbackfail_t) (_IO_FILE *, int); +#define _IO_PBACKFAIL(FP, CH) JUMP1 (__pbackfail, FP, CH) +#define _IO_WPBACKFAIL(FP, CH) WJUMP1 (__pbackfail, FP, CH) + +/* The 'xsputn' hook writes upto N characters from buffer DATA. + Returns EOF or the number of character actually written. + It matches the streambuf::xsputn virtual function. */ +typedef _IO_size_t (*_IO_xsputn_t) (_IO_FILE *FP, const void *DATA, + _IO_size_t N); +#define _IO_XSPUTN(FP, DATA, N) JUMP2 (__xsputn, FP, DATA, N) +#define _IO_WXSPUTN(FP, DATA, N) WJUMP2 (__xsputn, FP, DATA, N) + +/* The 'xsgetn' hook reads upto N characters into buffer DATA. + Returns the number of character actually read. + It matches the streambuf::xsgetn virtual function. */ +typedef _IO_size_t (*_IO_xsgetn_t) (_IO_FILE *FP, void *DATA, _IO_size_t N); +#define _IO_XSGETN(FP, DATA, N) JUMP2 (__xsgetn, FP, DATA, N) +#define _IO_WXSGETN(FP, DATA, N) WJUMP2 (__xsgetn, FP, DATA, N) + +/* The 'seekoff' hook moves the stream position to a new position + relative to the start of the file (if DIR==0), the current position + (MODE==1), or the end of the file (MODE==2). + It matches the streambuf::seekoff virtual function. + It is also used for the ANSI fseek function. */ +typedef _IO_off64_t (*_IO_seekoff_t) (_IO_FILE *FP, _IO_off64_t OFF, int DIR, + int MODE); +#define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3 (__seekoff, FP, OFF, DIR, MODE) +#define _IO_WSEEKOFF(FP, OFF, DIR, MODE) WJUMP3 (__seekoff, FP, OFF, DIR, MODE) + +/* The 'seekpos' hook also moves the stream position, + but to an absolute position given by a fpos64_t (seekpos). + It matches the streambuf::seekpos virtual function. + It is also used for the ANSI fgetpos and fsetpos functions. */ +/* The _IO_seek_cur and _IO_seek_end options are not allowed. */ +typedef _IO_off64_t (*_IO_seekpos_t) (_IO_FILE *, _IO_off64_t, int); +#define _IO_SEEKPOS(FP, POS, FLAGS) JUMP2 (__seekpos, FP, POS, FLAGS) +#define _IO_WSEEKPOS(FP, POS, FLAGS) WJUMP2 (__seekpos, FP, POS, FLAGS) + +/* The 'setbuf' hook gives a buffer to the file. + It matches the streambuf::setbuf virtual function. */ +typedef _IO_FILE* (*_IO_setbuf_t) (_IO_FILE *, char *, _IO_ssize_t); +#define _IO_SETBUF(FP, BUFFER, LENGTH) JUMP2 (__setbuf, FP, BUFFER, LENGTH) +#define _IO_WSETBUF(FP, BUFFER, LENGTH) WJUMP2 (__setbuf, FP, BUFFER, LENGTH) + +/* The 'sync' hook attempts to synchronize the internal data structures + of the file with the external state. + It matches the streambuf::sync virtual function. */ +typedef int (*_IO_sync_t) (_IO_FILE *); +#define _IO_SYNC(FP) JUMP0 (__sync, FP) +#define _IO_WSYNC(FP) WJUMP0 (__sync, FP) + +/* The 'doallocate' hook is used to tell the file to allocate a buffer. + It matches the streambuf::doallocate virtual function, which is not + in the ANSI/ISO C++ standard, but is part traditional implementations. */ +typedef int (*_IO_doallocate_t) (_IO_FILE *); +#define _IO_DOALLOCATE(FP) JUMP0 (__doallocate, FP) +#define _IO_WDOALLOCATE(FP) WJUMP0 (__doallocate, FP) + +/* The following four hooks (sysread, syswrite, sysclose, sysseek, and + sysstat) are low-level hooks specific to this implementation. + There is no correspondence in the ANSI/ISO C++ standard library. + The hooks basically correspond to the Unix system functions + (read, write, close, lseek, and stat) except that a _IO_FILE* + parameter is used instead of an integer file descriptor; the default + implementation used for normal files just calls those functions. + The advantage of overriding these functions instead of the higher-level + ones (underflow, overflow etc) is that you can leave all the buffering + higher-level functions. */ + +/* The 'sysread' hook is used to read data from the external file into + an existing buffer. It generalizes the Unix read(2) function. + It matches the streambuf::sys_read virtual function, which is + specific to this implementation. */ +typedef _IO_ssize_t (*_IO_read_t) (_IO_FILE *, void *, _IO_ssize_t); +#define _IO_SYSREAD(FP, DATA, LEN) JUMP2 (__read, FP, DATA, LEN) +#define _IO_WSYSREAD(FP, DATA, LEN) WJUMP2 (__read, FP, DATA, LEN) + +/* The 'syswrite' hook is used to write data from an existing buffer + to an external file. It generalizes the Unix write(2) function. + It matches the streambuf::sys_write virtual function, which is + specific to this implementation. */ +typedef _IO_ssize_t (*_IO_write_t) (_IO_FILE *, const void *, _IO_ssize_t); +#define _IO_SYSWRITE(FP, DATA, LEN) JUMP2 (__write, FP, DATA, LEN) +#define _IO_WSYSWRITE(FP, DATA, LEN) WJUMP2 (__write, FP, DATA, LEN) + +/* The 'sysseek' hook is used to re-position an external file. + It generalizes the Unix lseek(2) function. + It matches the streambuf::sys_seek virtual function, which is + specific to this implementation. */ +typedef _IO_off64_t (*_IO_seek_t) (_IO_FILE *, _IO_off64_t, int); +#define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2 (__seek, FP, OFFSET, MODE) +#define _IO_WSYSSEEK(FP, OFFSET, MODE) WJUMP2 (__seek, FP, OFFSET, MODE) + +/* The 'sysclose' hook is used to finalize (close, finish up) an + external file. It generalizes the Unix close(2) function. + It matches the streambuf::sys_close virtual function, which is + specific to this implementation. */ +typedef int (*_IO_close_t) (_IO_FILE *); /* finalize */ +#define _IO_SYSCLOSE(FP) JUMP0 (__close, FP) +#define _IO_WSYSCLOSE(FP) WJUMP0 (__close, FP) + +/* The 'sysstat' hook is used to get information about an external file + into a struct stat buffer. It generalizes the Unix fstat(2) call. + It matches the streambuf::sys_stat virtual function, which is + specific to this implementation. */ +typedef int (*_IO_stat_t) (_IO_FILE *, void *); +#define _IO_SYSSTAT(FP, BUF) JUMP1 (__stat, FP, BUF) +#define _IO_WSYSSTAT(FP, BUF) WJUMP1 (__stat, FP, BUF) + +/* The 'showmany' hook can be used to get an image how much input is + available. In many cases the answer will be 0 which means unknown + but some cases one can provide real information. */ +typedef int (*_IO_showmanyc_t) (_IO_FILE *); +#define _IO_SHOWMANYC(FP) JUMP0 (__showmanyc, FP) +#define _IO_WSHOWMANYC(FP) WJUMP0 (__showmanyc, FP) + +/* The 'imbue' hook is used to get information about the currently + installed locales. */ +typedef void (*_IO_imbue_t) (_IO_FILE *, void *); +#define _IO_IMBUE(FP, LOCALE) JUMP1 (__imbue, FP, LOCALE) +#define _IO_WIMBUE(FP, LOCALE) WJUMP1 (__imbue, FP, LOCALE) + + +#define _IO_CHAR_TYPE char /* unsigned char ? */ +#define _IO_INT_TYPE int + +struct _IO_jump_t +{ + JUMP_FIELD(size_t, __dummy); + JUMP_FIELD(size_t, __dummy2); + JUMP_FIELD(_IO_finish_t, __finish); + JUMP_FIELD(_IO_overflow_t, __overflow); + JUMP_FIELD(_IO_underflow_t, __underflow); + JUMP_FIELD(_IO_underflow_t, __uflow); + JUMP_FIELD(_IO_pbackfail_t, __pbackfail); + /* showmany */ + JUMP_FIELD(_IO_xsputn_t, __xsputn); + JUMP_FIELD(_IO_xsgetn_t, __xsgetn); + JUMP_FIELD(_IO_seekoff_t, __seekoff); + JUMP_FIELD(_IO_seekpos_t, __seekpos); + JUMP_FIELD(_IO_setbuf_t, __setbuf); + JUMP_FIELD(_IO_sync_t, __sync); + JUMP_FIELD(_IO_doallocate_t, __doallocate); + JUMP_FIELD(_IO_read_t, __read); + JUMP_FIELD(_IO_write_t, __write); + JUMP_FIELD(_IO_seek_t, __seek); + JUMP_FIELD(_IO_close_t, __close); + JUMP_FIELD(_IO_stat_t, __stat); + JUMP_FIELD(_IO_showmanyc_t, __showmanyc); + JUMP_FIELD(_IO_imbue_t, __imbue); +#if 0 + get_column; + set_column; +#endif +}; + +/* We always allocate an extra word following an _IO_FILE. + This contains a pointer to the function jump table used. + This is for compatibility with C++ streambuf; the word can + be used to smash to a pointer to a virtual function table. */ + +struct _IO_FILE_plus +{ + _IO_FILE file; + const struct _IO_jump_t *vtable; +}; + +#ifdef _IO_USE_OLD_IO_FILE +/* This structure is used by the compatibility code as if it were an + _IO_FILE_plus, but has enough space to initialize the _mode argument + of an _IO_FILE_complete. */ +struct _IO_FILE_complete_plus +{ + struct _IO_FILE_complete file; + const struct _IO_jump_t *vtable; +}; +#endif + +/* Special file type for fopencookie function. */ +struct _IO_cookie_file +{ + struct _IO_FILE_plus __fp; + void *__cookie; + _IO_cookie_io_functions_t __io_functions; +}; + +_IO_FILE *_IO_fopencookie (void *cookie, const char *mode, + _IO_cookie_io_functions_t io_functions); + + +/* Iterator type for walking global linked list of _IO_FILE objects. */ + +typedef struct _IO_FILE *_IO_ITER; + +/* Generic functions */ + +extern void _IO_switch_to_main_get_area (_IO_FILE *) __THROW; +extern void _IO_switch_to_backup_area (_IO_FILE *) __THROW; +extern int _IO_switch_to_get_mode (_IO_FILE *); +libc_hidden_proto (_IO_switch_to_get_mode) +extern void _IO_init_internal (_IO_FILE *, int) attribute_hidden; +extern int _IO_sputbackc (_IO_FILE *, int) __THROW; +libc_hidden_proto (_IO_sputbackc) +extern int _IO_sungetc (_IO_FILE *) __THROW; +extern void _IO_un_link (struct _IO_FILE_plus *) __THROW; +libc_hidden_proto (_IO_un_link) +extern void _IO_link_in (struct _IO_FILE_plus *) __THROW; +libc_hidden_proto (_IO_link_in) +extern void _IO_doallocbuf (_IO_FILE *) __THROW; +libc_hidden_proto (_IO_doallocbuf) +extern void _IO_unsave_markers (_IO_FILE *) __THROW; +libc_hidden_proto (_IO_unsave_markers) +extern void _IO_setb (_IO_FILE *, char *, char *, int) __THROW; +libc_hidden_proto (_IO_setb) +extern unsigned _IO_adjust_column (unsigned, const char *, int) __THROW; +libc_hidden_proto (_IO_adjust_column) +#define _IO_sputn(__fp, __s, __n) _IO_XSPUTN (__fp, __s, __n) + +_IO_ssize_t _IO_least_wmarker (_IO_FILE *, wchar_t *) __THROW; +libc_hidden_proto (_IO_least_wmarker) +extern void _IO_switch_to_main_wget_area (_IO_FILE *) __THROW; +libc_hidden_proto (_IO_switch_to_main_wget_area) +extern void _IO_switch_to_wbackup_area (_IO_FILE *) __THROW; +libc_hidden_proto (_IO_switch_to_wbackup_area) +extern int _IO_switch_to_wget_mode (_IO_FILE *); +libc_hidden_proto (_IO_switch_to_wget_mode) +extern void _IO_wsetb (_IO_FILE *, wchar_t *, wchar_t *, int) __THROW; +libc_hidden_proto (_IO_wsetb) +extern wint_t _IO_sputbackwc (_IO_FILE *, wint_t) __THROW; +libc_hidden_proto (_IO_sputbackwc) +extern wint_t _IO_sungetwc (_IO_FILE *) __THROW; +extern void _IO_wdoallocbuf (_IO_FILE *) __THROW; +libc_hidden_proto (_IO_wdoallocbuf) +extern void _IO_unsave_wmarkers (_IO_FILE *) __THROW; +extern unsigned _IO_adjust_wcolumn (unsigned, const wchar_t *, int) __THROW; +extern _IO_off64_t get_file_offset (_IO_FILE *fp); + +/* Marker-related function. */ + +extern void _IO_init_marker (struct _IO_marker *, _IO_FILE *); +extern void _IO_init_wmarker (struct _IO_marker *, _IO_FILE *); +extern void _IO_remove_marker (struct _IO_marker *) __THROW; +extern int _IO_marker_difference (struct _IO_marker *, struct _IO_marker *) + __THROW; +extern int _IO_marker_delta (struct _IO_marker *) __THROW; +extern int _IO_wmarker_delta (struct _IO_marker *) __THROW; +extern int _IO_seekmark (_IO_FILE *, struct _IO_marker *, int) __THROW; +extern int _IO_seekwmark (_IO_FILE *, struct _IO_marker *, int) __THROW; + +/* Functions for iterating global list and dealing with its lock */ + +extern _IO_ITER _IO_iter_begin (void) __THROW; +libc_hidden_proto (_IO_iter_begin) +extern _IO_ITER _IO_iter_end (void) __THROW; +libc_hidden_proto (_IO_iter_end) +extern _IO_ITER _IO_iter_next (_IO_ITER) __THROW; +libc_hidden_proto (_IO_iter_next) +extern _IO_FILE *_IO_iter_file (_IO_ITER) __THROW; +libc_hidden_proto (_IO_iter_file) +extern void _IO_list_lock (void) __THROW; +libc_hidden_proto (_IO_list_lock) +extern void _IO_list_unlock (void) __THROW; +libc_hidden_proto (_IO_list_unlock) +extern void _IO_list_resetlock (void) __THROW; +libc_hidden_proto (_IO_list_resetlock) + +/* Default jumptable functions. */ + +extern int _IO_default_underflow (_IO_FILE *) __THROW; +extern int _IO_default_uflow (_IO_FILE *); +libc_hidden_proto (_IO_default_uflow) +extern wint_t _IO_wdefault_uflow (_IO_FILE *); +libc_hidden_proto (_IO_wdefault_uflow) +extern int _IO_default_doallocate (_IO_FILE *) __THROW; +libc_hidden_proto (_IO_default_doallocate) +extern int _IO_wdefault_doallocate (_IO_FILE *) __THROW; +libc_hidden_proto (_IO_wdefault_doallocate) +extern void _IO_default_finish (_IO_FILE *, int) __THROW; +libc_hidden_proto (_IO_default_finish) +extern void _IO_wdefault_finish (_IO_FILE *, int) __THROW; +libc_hidden_proto (_IO_wdefault_finish) +extern int _IO_default_pbackfail (_IO_FILE *, int) __THROW; +libc_hidden_proto (_IO_default_pbackfail) +extern wint_t _IO_wdefault_pbackfail (_IO_FILE *, wint_t) __THROW; +libc_hidden_proto (_IO_wdefault_pbackfail) +extern _IO_FILE* _IO_default_setbuf (_IO_FILE *, char *, _IO_ssize_t); +extern _IO_size_t _IO_default_xsputn (_IO_FILE *, const void *, _IO_size_t); +libc_hidden_proto (_IO_default_xsputn) +extern _IO_size_t _IO_wdefault_xsputn (_IO_FILE *, const void *, _IO_size_t); +libc_hidden_proto (_IO_wdefault_xsputn) +extern _IO_size_t _IO_default_xsgetn (_IO_FILE *, void *, _IO_size_t); +libc_hidden_proto (_IO_default_xsgetn) +extern _IO_size_t _IO_wdefault_xsgetn (_IO_FILE *, void *, _IO_size_t); +libc_hidden_proto (_IO_wdefault_xsgetn) +extern _IO_off64_t _IO_default_seekoff (_IO_FILE *, _IO_off64_t, int, int) + __THROW; +extern _IO_off64_t _IO_default_seekpos (_IO_FILE *, _IO_off64_t, int); +extern _IO_ssize_t _IO_default_write (_IO_FILE *, const void *, _IO_ssize_t); +extern _IO_ssize_t _IO_default_read (_IO_FILE *, void *, _IO_ssize_t); +extern int _IO_default_stat (_IO_FILE *, void *) __THROW; +extern _IO_off64_t _IO_default_seek (_IO_FILE *, _IO_off64_t, int) __THROW; +extern int _IO_default_sync (_IO_FILE *) __THROW; +#define _IO_default_close ((_IO_close_t) _IO_default_sync) +extern int _IO_default_showmanyc (_IO_FILE *) __THROW; +extern void _IO_default_imbue (_IO_FILE *, void *) __THROW; + +extern const struct _IO_jump_t _IO_file_jumps; +libc_hidden_proto (_IO_file_jumps) +extern const struct _IO_jump_t _IO_file_jumps_mmap attribute_hidden; +extern const struct _IO_jump_t _IO_file_jumps_maybe_mmap attribute_hidden; +extern const struct _IO_jump_t _IO_wfile_jumps; +libc_hidden_proto (_IO_wfile_jumps) +extern const struct _IO_jump_t _IO_wfile_jumps_mmap attribute_hidden; +extern const struct _IO_jump_t _IO_wfile_jumps_maybe_mmap attribute_hidden; +extern const struct _IO_jump_t _IO_old_file_jumps attribute_hidden; +extern const struct _IO_jump_t _IO_streambuf_jumps; +extern const struct _IO_jump_t _IO_old_proc_jumps attribute_hidden; +extern const struct _IO_jump_t _IO_str_jumps attribute_hidden; +extern const struct _IO_jump_t _IO_wstr_jumps attribute_hidden; +extern const struct _IO_codecvt __libio_codecvt attribute_hidden; +extern int _IO_do_write (_IO_FILE *, const char *, _IO_size_t); +libc_hidden_proto (_IO_do_write) +extern int _IO_new_do_write (_IO_FILE *, const char *, _IO_size_t); +extern int _IO_old_do_write (_IO_FILE *, const char *, _IO_size_t); +extern int _IO_wdo_write (_IO_FILE *, const wchar_t *, _IO_size_t); +libc_hidden_proto (_IO_wdo_write) +extern int _IO_flush_all_lockp (int); +extern int _IO_flush_all (void); +libc_hidden_proto (_IO_flush_all) +extern int _IO_cleanup (void); +extern void _IO_flush_all_linebuffered (void); +libc_hidden_proto (_IO_flush_all_linebuffered) +extern int _IO_new_fgetpos (_IO_FILE *, _IO_fpos_t *); +extern int _IO_old_fgetpos (_IO_FILE *, _IO_fpos_t *); +extern int _IO_new_fsetpos (_IO_FILE *, const _IO_fpos_t *); +extern int _IO_old_fsetpos (_IO_FILE *, const _IO_fpos_t *); +extern int _IO_new_fgetpos64 (_IO_FILE *, _IO_fpos64_t *); +extern int _IO_old_fgetpos64 (_IO_FILE *, _IO_fpos64_t *); +extern int _IO_new_fsetpos64 (_IO_FILE *, const _IO_fpos64_t *); +extern int _IO_old_fsetpos64 (_IO_FILE *, const _IO_fpos64_t *); +extern void _IO_old_init (_IO_FILE *fp, int flags) __THROW; + + +#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T +# define _IO_do_flush(_f) \ + ((_f)->_mode <= 0 \ + ? _IO_do_write(_f, (_f)->_IO_write_base, \ + (_f)->_IO_write_ptr-(_f)->_IO_write_base) \ + : _IO_wdo_write(_f, (_f)->_wide_data->_IO_write_base, \ + ((_f)->_wide_data->_IO_write_ptr \ + - (_f)->_wide_data->_IO_write_base))) +#else +# define _IO_do_flush(_f) \ + _IO_do_write(_f, (_f)->_IO_write_base, \ + (_f)->_IO_write_ptr-(_f)->_IO_write_base) +#endif +#define _IO_old_do_flush(_f) \ + _IO_old_do_write(_f, (_f)->_IO_write_base, \ + (_f)->_IO_write_ptr-(_f)->_IO_write_base) +#define _IO_in_put_mode(_fp) ((_fp)->_flags & _IO_CURRENTLY_PUTTING) +#define _IO_mask_flags(fp, f, mask) \ + ((fp)->_flags = ((fp)->_flags & ~(mask)) | ((f) & (mask))) +#define _IO_setg(fp, eb, g, eg) ((fp)->_IO_read_base = (eb),\ + (fp)->_IO_read_ptr = (g), (fp)->_IO_read_end = (eg)) +#define _IO_wsetg(fp, eb, g, eg) ((fp)->_wide_data->_IO_read_base = (eb),\ + (fp)->_wide_data->_IO_read_ptr = (g), \ + (fp)->_wide_data->_IO_read_end = (eg)) +#define _IO_setp(__fp, __p, __ep) \ + ((__fp)->_IO_write_base = (__fp)->_IO_write_ptr \ + = __p, (__fp)->_IO_write_end = (__ep)) +#define _IO_wsetp(__fp, __p, __ep) \ + ((__fp)->_wide_data->_IO_write_base \ + = (__fp)->_wide_data->_IO_write_ptr = __p, \ + (__fp)->_wide_data->_IO_write_end = (__ep)) +#define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL) +#define _IO_have_wbackup(fp) ((fp)->_wide_data->_IO_save_base != NULL) +#define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP) +#define _IO_have_markers(fp) ((fp)->_markers != NULL) +#define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base) +#define _IO_wblen(fp) ((fp)->_wide_data->_IO_buf_end \ + - (fp)->_wide_data->_IO_buf_base) + +/* Jumptable functions for files. */ + +extern int _IO_file_doallocate (_IO_FILE *) __THROW; +libc_hidden_proto (_IO_file_doallocate) +extern _IO_FILE* _IO_file_setbuf (_IO_FILE *, char *, _IO_ssize_t); +libc_hidden_proto (_IO_file_setbuf) +extern _IO_off64_t _IO_file_seekoff (_IO_FILE *, _IO_off64_t, int, int); +libc_hidden_proto (_IO_file_seekoff) +extern _IO_off64_t _IO_file_seekoff_mmap (_IO_FILE *, _IO_off64_t, int, int) + __THROW; +extern _IO_size_t _IO_file_xsputn (_IO_FILE *, const void *, _IO_size_t); +libc_hidden_proto (_IO_file_xsputn) +extern _IO_size_t _IO_file_xsgetn (_IO_FILE *, void *, _IO_size_t); +libc_hidden_proto (_IO_file_xsgetn) +extern int _IO_file_stat (_IO_FILE *, void *) __THROW; +libc_hidden_proto (_IO_file_stat) +extern int _IO_file_close (_IO_FILE *) __THROW; +libc_hidden_proto (_IO_file_close) +extern int _IO_file_close_mmap (_IO_FILE *) __THROW; +extern int _IO_file_underflow (_IO_FILE *); +libc_hidden_proto (_IO_file_underflow) +extern int _IO_file_underflow_mmap (_IO_FILE *); +extern int _IO_file_underflow_maybe_mmap (_IO_FILE *); +extern int _IO_file_overflow (_IO_FILE *, int); +libc_hidden_proto (_IO_file_overflow) +#define _IO_file_is_open(__fp) ((__fp)->_fileno != -1) +extern _IO_FILE* _IO_file_attach (_IO_FILE *, int); +libc_hidden_proto (_IO_file_attach) +extern _IO_FILE* _IO_file_open (_IO_FILE *, const char *, int, int, int, int); +libc_hidden_proto (_IO_file_open) +extern _IO_FILE* _IO_file_fopen (_IO_FILE *, const char *, const char *, int); +libc_hidden_proto (_IO_file_fopen) +extern _IO_ssize_t _IO_file_write (_IO_FILE *, const void *, _IO_ssize_t); +extern _IO_ssize_t _IO_file_read (_IO_FILE *, void *, _IO_ssize_t); +libc_hidden_proto (_IO_file_read) +extern int _IO_file_sync (_IO_FILE *); +libc_hidden_proto (_IO_file_sync) +extern int _IO_file_close_it (_IO_FILE *); +libc_hidden_proto (_IO_file_close_it) +extern _IO_off64_t _IO_file_seek (_IO_FILE *, _IO_off64_t, int) __THROW; +libc_hidden_proto (_IO_file_seek) +extern void _IO_file_finish (_IO_FILE *, int); +libc_hidden_proto (_IO_file_finish) + +extern _IO_FILE* _IO_new_file_attach (_IO_FILE *, int); +extern int _IO_new_file_close_it (_IO_FILE *); +extern void _IO_new_file_finish (_IO_FILE *, int); +extern _IO_FILE* _IO_new_file_fopen (_IO_FILE *, const char *, const char *, + int); +extern void _IO_no_init (_IO_FILE *, int, int, struct _IO_wide_data *, + const struct _IO_jump_t *) __THROW; +extern void _IO_new_file_init_internal (struct _IO_FILE_plus *) + __THROW attribute_hidden; +extern _IO_FILE* _IO_new_file_setbuf (_IO_FILE *, char *, _IO_ssize_t); +extern _IO_FILE* _IO_file_setbuf_mmap (_IO_FILE *, char *, _IO_ssize_t); +extern int _IO_new_file_sync (_IO_FILE *); +extern int _IO_new_file_underflow (_IO_FILE *); +extern int _IO_new_file_overflow (_IO_FILE *, int); +extern _IO_off64_t _IO_new_file_seekoff (_IO_FILE *, _IO_off64_t, int, int); +extern _IO_ssize_t _IO_new_file_write (_IO_FILE *, const void *, _IO_ssize_t); +extern _IO_size_t _IO_new_file_xsputn (_IO_FILE *, const void *, _IO_size_t); + +extern _IO_FILE* _IO_old_file_setbuf (_IO_FILE *, char *, _IO_ssize_t); +extern _IO_off64_t _IO_old_file_seekoff (_IO_FILE *, _IO_off64_t, int, int); +extern _IO_size_t _IO_old_file_xsputn (_IO_FILE *, const void *, _IO_size_t); +extern int _IO_old_file_underflow (_IO_FILE *); +extern int _IO_old_file_overflow (_IO_FILE *, int); +extern void _IO_old_file_init_internal (struct _IO_FILE_plus *) + __THROW attribute_hidden; +extern _IO_FILE* _IO_old_file_attach (_IO_FILE *, int); +extern _IO_FILE* _IO_old_file_fopen (_IO_FILE *, const char *, const char *); +extern _IO_ssize_t _IO_old_file_write (_IO_FILE *, const void *, _IO_ssize_t); +extern int _IO_old_file_sync (_IO_FILE *); +extern int _IO_old_file_close_it (_IO_FILE *); +extern void _IO_old_file_finish (_IO_FILE *, int); + +extern int _IO_wfile_doallocate (_IO_FILE *) __THROW; +extern _IO_size_t _IO_wfile_xsputn (_IO_FILE *, const void *, _IO_size_t); +libc_hidden_proto (_IO_wfile_xsputn) +extern _IO_FILE* _IO_wfile_setbuf (_IO_FILE *, wchar_t *, _IO_ssize_t); +extern wint_t _IO_wfile_sync (_IO_FILE *); +libc_hidden_proto (_IO_wfile_sync) +extern wint_t _IO_wfile_underflow (_IO_FILE *); +libc_hidden_proto (_IO_wfile_underflow) +extern wint_t _IO_wfile_overflow (_IO_FILE *, wint_t); +libc_hidden_proto (_IO_wfile_overflow) +extern _IO_off64_t _IO_wfile_seekoff (_IO_FILE *, _IO_off64_t, int, int); +libc_hidden_proto (_IO_wfile_seekoff) + +/* Jumptable functions for proc_files. */ +extern _IO_FILE* _IO_proc_open (_IO_FILE *, const char *, const char *) + __THROW; +extern _IO_FILE* _IO_new_proc_open (_IO_FILE *, const char *, const char *) + __THROW; +extern _IO_FILE* _IO_old_proc_open (_IO_FILE *, const char *, const char *); +extern int _IO_proc_close (_IO_FILE *) __THROW; +extern int _IO_new_proc_close (_IO_FILE *) __THROW; +extern int _IO_old_proc_close (_IO_FILE *); + +/* Jumptable functions for strfiles. */ +extern int _IO_str_underflow (_IO_FILE *) __THROW; +libc_hidden_proto (_IO_str_underflow) +extern int _IO_str_overflow (_IO_FILE *, int) __THROW; +libc_hidden_proto (_IO_str_overflow) +extern int _IO_str_pbackfail (_IO_FILE *, int) __THROW; +libc_hidden_proto (_IO_str_pbackfail) +extern _IO_off64_t _IO_str_seekoff (_IO_FILE *, _IO_off64_t, int, int) __THROW; +libc_hidden_proto (_IO_str_seekoff) +extern void _IO_str_finish (_IO_FILE *, int) __THROW; + +/* Other strfile functions */ +struct _IO_strfile_; +extern _IO_ssize_t _IO_str_count (_IO_FILE *) __THROW; + +/* And the wide character versions. */ +extern void _IO_wstr_init_static (_IO_FILE *, wchar_t *, _IO_size_t, wchar_t *) + __THROW; +extern _IO_ssize_t _IO_wstr_count (_IO_FILE *) __THROW; +extern _IO_wint_t _IO_wstr_overflow (_IO_FILE *, _IO_wint_t) __THROW; +extern _IO_wint_t _IO_wstr_underflow (_IO_FILE *) __THROW; +extern _IO_off64_t _IO_wstr_seekoff (_IO_FILE *, _IO_off64_t, int, int) + __THROW; +extern _IO_wint_t _IO_wstr_pbackfail (_IO_FILE *, _IO_wint_t) __THROW; +extern void _IO_wstr_finish (_IO_FILE *, int) __THROW; + +extern int _IO_vasprintf (char **result_ptr, const char *format, + _IO_va_list args) __THROW; +extern int _IO_vdprintf (int d, const char *format, _IO_va_list arg); +extern int _IO_vsnprintf (char *string, _IO_size_t maxlen, + const char *format, _IO_va_list args) __THROW; + + +extern _IO_size_t _IO_getline (_IO_FILE *,char *, _IO_size_t, int, int); +libc_hidden_proto (_IO_getline) +extern _IO_size_t _IO_getline_info (_IO_FILE *,char *, _IO_size_t, + int, int, int *); +libc_hidden_proto (_IO_getline_info) +extern _IO_ssize_t _IO_getdelim (char **, _IO_size_t *, int, _IO_FILE *); +extern _IO_size_t _IO_getwline (_IO_FILE *,wchar_t *, _IO_size_t, wint_t, int); +extern _IO_size_t _IO_getwline_info (_IO_FILE *,wchar_t *, _IO_size_t, + wint_t, int, wint_t *); + +extern struct _IO_FILE_plus *_IO_list_all; +libc_hidden_proto (_IO_list_all) +extern void (*_IO_cleanup_registration_needed) (void); + +extern void _IO_str_init_static_internal (struct _IO_strfile_ *, char *, + _IO_size_t, char *) __THROW; +extern _IO_off64_t _IO_seekoff_unlocked (_IO_FILE *, _IO_off64_t, int, int) + attribute_hidden; +extern _IO_off64_t _IO_seekpos_unlocked (_IO_FILE *, _IO_off64_t, int) + attribute_hidden; + +#ifndef EOF +# define EOF (-1) +#endif +#ifndef NULL +# if defined __GNUG__ && \ + (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8)) +# define NULL (__null) +# else +# if !defined(__cplusplus) +# define NULL ((void*)0) +# else +# define NULL (0) +# endif +# endif +#endif + +#if _G_HAVE_MMAP + +# include <unistd.h> +# include <fcntl.h> +# include <sys/mman.h> +# include <sys/param.h> + +# if !defined(MAP_ANONYMOUS) && defined(MAP_ANON) +# define MAP_ANONYMOUS MAP_ANON +# endif + +# if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE) +# undef _G_HAVE_MMAP +# define _G_HAVE_MMAP 0 +# endif + +#endif /* _G_HAVE_MMAP */ + +#if _G_HAVE_MMAP + +# ifdef _LIBC +/* When using this code in the GNU libc we must not pollute the name space. */ +# define mmap __mmap +# define munmap __munmap +# define ftruncate __ftruncate +# endif +#endif /* _G_HAVE_MMAP */ + +#ifndef OS_FSTAT +# define OS_FSTAT fstat +#endif +extern int _IO_vscanf (const char *, _IO_va_list) __THROW; + +/* _IO_pos_BAD is an _IO_off64_t value indicating error, unknown, or EOF. */ +#ifndef _IO_pos_BAD +# define _IO_pos_BAD ((_IO_off64_t) -1) +#endif +/* _IO_pos_adjust adjust an _IO_off64_t by some number of bytes. */ +#ifndef _IO_pos_adjust +# define _IO_pos_adjust(pos, delta) ((pos) += (delta)) +#endif +/* _IO_pos_0 is an _IO_off64_t value indicating beginning of file. */ +#ifndef _IO_pos_0 +# define _IO_pos_0 ((_IO_off64_t) 0) +#endif + +#ifdef __cplusplus +} +#endif + +#ifdef _IO_MTSAFE_IO +/* check following! */ +# ifdef _IO_USE_OLD_IO_FILE +# define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \ + { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \ + 0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock } +# else +# if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T +# define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \ + { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \ + 0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock, _IO_pos_BAD,\ + NULL, WDP, 0 } +# else +# define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \ + { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \ + 0, _IO_pos_BAD, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock, _IO_pos_BAD,\ + 0 } +# endif +# endif +#else +# ifdef _IO_USE_OLD_IO_FILE +# define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \ + { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \ + 0, _IO_pos_BAD } +# else +# if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T +# define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \ + { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \ + 0, _IO_pos_BAD, 0, 0, { 0 }, 0, _IO_pos_BAD, \ + NULL, WDP, 0 } +# else +# define FILEBUF_LITERAL(CHAIN, FLAGS, FD, WDP) \ + { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, (_IO_FILE *) CHAIN, FD, \ + 0, _IO_pos_BAD, 0, 0, { 0 }, 0, _IO_pos_BAD, \ + 0 } +# endif +# endif +#endif + +#define _IO_va_start(args, last) va_start(args, last) + +extern struct _IO_fake_stdiobuf _IO_stdin_buf, _IO_stdout_buf, _IO_stderr_buf; + +#if 1 +# define COERCE_FILE(FILE) /* Nothing */ +#else +/* This is part of the kludge for binary compatibility with old stdio. */ +# define COERCE_FILE(FILE) \ + (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) == _OLD_MAGIC_MASK \ + && (FILE) = *(FILE**)&((int*)fp)[1]) +#endif + +#ifdef EINVAL +# define MAYBE_SET_EINVAL __set_errno (EINVAL) +#else +# define MAYBE_SET_EINVAL /* nothing */ +#endif + +#ifdef IO_DEBUG +# define CHECK_FILE(FILE, RET) \ + if ((FILE) == NULL) { MAYBE_SET_EINVAL; return RET; } \ + else { COERCE_FILE(FILE); \ + if (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) != _IO_MAGIC) \ + { MAYBE_SET_EINVAL; return RET; }} +#else +# define CHECK_FILE(FILE, RET) COERCE_FILE (FILE) +#endif + +static inline void +__attribute__ ((__always_inline__)) +_IO_acquire_lock_fct (_IO_FILE **p) +{ + _IO_FILE *fp = *p; + if ((fp->_flags & _IO_USER_LOCK) == 0) + _IO_funlockfile (fp); +} + +static inline void +__attribute__ ((__always_inline__)) +_IO_acquire_lock_clear_flags2_fct (_IO_FILE **p) +{ + _IO_FILE *fp = *p; + fp->_flags2 &= ~(_IO_FLAGS2_FORTIFY | _IO_FLAGS2_SCANF_STD); + if ((fp->_flags & _IO_USER_LOCK) == 0) + _IO_funlockfile (fp); +} + +#if !defined _IO_MTSAFE_IO && IS_IN (libc) +# define _IO_acquire_lock(_fp) \ + do { \ + _IO_FILE *_IO_acquire_lock_file = NULL +# define _IO_acquire_lock_clear_flags2(_fp) \ + do { \ + _IO_FILE *_IO_acquire_lock_file = (_fp) +# define _IO_release_lock(_fp) \ + if (_IO_acquire_lock_file != NULL) \ + _IO_acquire_lock_file->_flags2 &= ~(_IO_FLAGS2_FORTIFY \ + | _IO_FLAGS2_SCANF_STD); \ + } while (0) +#endif + +/* Collect all vtables in a special section for vtable verification. + These symbols cover the extent of this section. */ +symbol_set_declare (__libc_IO_vtables) + +/* libio vtables need to carry this attribute so that they pass + validation. */ +#define libio_vtable __attribute__ ((section ("__libc_IO_vtables"))) + +#ifdef SHARED +/* If equal to &_IO_vtable_check (with pointer guard protection), + unknown vtable pointers are valid. This function pointer is solely + used as a flag. */ +extern void (*IO_accept_foreign_vtables) (void) attribute_hidden; + +/* Assigns the passed function pointer (either NULL or + &_IO_vtable_check) to IO_accept_foreign_vtables. */ +static inline void +IO_set_accept_foreign_vtables (void (*flag) (void)) +{ +#ifdef PTR_MANGLE + PTR_MANGLE (flag); +#endif + atomic_store_relaxed (&IO_accept_foreign_vtables, flag); +} + +#else /* !SHARED */ + +/* The statically-linked version does nothing. */ +static inline void +IO_set_accept_foreign_vtables (void (*flag) (void)) +{ +} + +#endif + +/* Check if unknown vtable pointers are permitted; otherwise, + terminate the process. */ +void _IO_vtable_check (void) attribute_hidden; + +/* Perform vtable pointer validation. If validation fails, terminate + the process. */ +static inline const struct _IO_jump_t * +IO_validate_vtable (const struct _IO_jump_t *vtable) +{ + /* Fast path: The vtable pointer is within the __libc_IO_vtables + section. */ + uintptr_t section_length = __stop___libc_IO_vtables - __start___libc_IO_vtables; + const char *ptr = (const char *) vtable; + uintptr_t offset = ptr - __start___libc_IO_vtables; + if (__glibc_unlikely (offset >= section_length)) + /* The vtable pointer is not in the expected section. Use the + slow path, which will terminate the process if necessary. */ + _IO_vtable_check (); + return vtable; +} |