libio/libioP.h

   1 /*
   2 Copyright (C) 1993 Free Software Foundation
   3
   4 This file is part of the GNU IO Library.  This library is free
   5 software; you can redistribute it and/or modify it under the
   6 terms of the GNU General Public License as published by the
   7 Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 This library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this library; see the file COPYING.  If not, write to the Free
  17 Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 As a special exception, if you link this library with files
  20 compiled with a GNU compiler to produce an executable, this does not cause
  21 the resulting executable to be covered by the GNU General Public License.
  22 This exception does not however invalidate any other reasons why
  23 the executable file might be covered by the GNU General Public License. */
  24
  25 #include <errno.h>
  26 #ifndef errno
  27 extern int errno;
  28 #endif
  29 #include <libc-lock.h>
  30
  31 #include "iolibio.h"
  32
  33 #if defined (__STDC__) || defined (_AIX) || (defined (__mips) && defined (_SYSTYPE_SVR4)) || defined(__cplusplus)
  34 /* All known AIX compilers implement these things (but don't always
  35    define __STDC__).  The RISC/OS MIPS compiler defines these things
  36    in SVR4 mode, but does not define __STDC__.  */
  37
  38 #define AND             ,
  39 #define DEFUN(name, arglist, args)      name(args)
  40 #define DEFUN_VOID(name)                name(void)
  41
  42 #else   /* Not ANSI C.  */
  43
  44 #define AND             ;
  45 #ifndef const /* some systems define it in header files for non-ansi mode */
  46 #define const
  47 #endif
  48 #define DEFUN(name, arglist, args)      name arglist args;
  49 #define DEFUN_VOID(name)                name()
  50 #endif  /* ANSI C.  */
  51
  52 #ifdef __cplusplus
  53 extern "C" {
  54 #endif
  55
  56 #define _IO_seek_set 0
  57 #define _IO_seek_cur 1
  58 #define _IO_seek_end 2
  59
  60 /* THE JUMPTABLE FUNCTIONS.
  61
  62  * The _IO_FILE type is used to implement the FILE type in GNU libc,
  63  * as well as the streambuf class in GNU iostreams for C++.
  64  * These are all the same, just used differently.
  65  * An _IO_FILE (or FILE) object is allows followed by a pointer to
  66  * a jump table (of pointers to functions).  The pointer is accessed
  67  * with the _IO_JUMPS macro.  The jump table has a eccentric format,
  68  * so as to be compatible with the layout of a C++ virtual function table.
  69  * (as implemented by g++).  When a pointer to a streambuf object is
  70  * coerced to an (_IO_FILE*), then _IO_JUMPS on the result just
  71  * happens to point to the virtual function table of the streambuf.
  72  * Thus the _IO_JUMPS function table used for C stdio/libio does
  73  * double duty as the virtual function table for C++ streambuf.
  74  *
  75  * The entries in the _IO_JUMPS function table (and hence also the
  76  * virtual functions of a streambuf) are described below.
  77  * The first parameter of each function entry is the _IO_FILE/streambuf
  78  * object being acted on (i.e. the 'this' parameter).
  79  */
  80
  81 #define _IO_JUMPS(THIS) ((struct _IO_FILE_plus*)(THIS))->vtable
  82 #ifdef _G_USING_THUNKS
  83 #define JUMP_FIELD(TYPE, NAME) TYPE NAME
  84 #define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC(THIS)
  85 #define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC(THIS, X1)
  86 #define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC(THIS, X1, X2)
  87 #define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC(THIS, X1,X2, X3)
  88 #define JUMP_INIT(NAME, VALUE) VALUE
  89 #define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0), JUMP_INIT(dummy2, 0)
  90 #else
  91 /* These macros will change when we re-implement vtables to use "thunks"! */
  92 #define JUMP_FIELD(TYPE, NAME) struct { short delta1, delta2; TYPE pfn; } NAME
  93 #define JUMP0(FUNC, THIS) _IO_JUMPS(THIS)->FUNC.pfn(THIS)
  94 #define JUMP1(FUNC, THIS, X1) _IO_JUMPS(THIS)->FUNC.pfn(THIS, X1)
  95 #define JUMP2(FUNC, THIS, X1, X2) _IO_JUMPS(THIS)->FUNC.pfn(THIS, X1, X2)
  96 #define JUMP3(FUNC, THIS, X1,X2,X3) _IO_JUMPS(THIS)->FUNC.pfn(THIS, X1,X2, X3)
  97 #define JUMP_INIT(NAME, VALUE) {0, 0, VALUE}
  98 #define JUMP_INIT_DUMMY JUMP_INIT(dummy, 0)
  99 #endif
 100
 101 /* The 'finish' function does any final cleaning up of an _IO_FILE object.
 102    It does not delete (free) it, but does everything else to finalize it/
 103    It matches the streambuf::~streambuf virtual destructor.  */
 104 typedef void (*_IO_finish_t) __P((_IO_FILE*)); /* finalize */
 105 #define _IO_FINISH(FP) JUMP0(__finish, FP)
 106
 107 /* The 'overflow' hook flushes the buffer.
 108    The second argument is a character, or EOF.
 109    It matches the streambuf::overflow virtual function. */
 110 typedef int (*_IO_overflow_t) __P((_IO_FILE*, int));
 111 #define _IO_OVERFLOW(FP, CH) JUMP1(__overflow, FP, CH)
 112
 113 /* The 'underflow' hook tries to fills the get buffer.
 114    It returns the next character (as an unsigned char) or EOF.  The next
 115    character remains in the get buffer, and the get position is not changed.
 116    It matches the streambuf::underflow virtual function. */
 117 typedef int (*_IO_underflow_t) __P((_IO_FILE*));
 118 #define _IO_UNDERFLOW(FP) JUMP0(__underflow, FP)
 119
 120 /* The 'uflow' hook returns the next character in the input stream
 121    (cast to unsigned char), and increments the read position;
 122    EOF is returned on failure.
 123    It matches the streambuf::uflow virtual function, which is not in the
 124    cfront implementation, but was added to C++ by the ANSI/ISO committee. */
 125 #define _IO_UFLOW(FP) JUMP0(__uflow, FP)
 126
 127 /* The 'pbackfail' hook handles backing up.
 128    It matches the streambuf::pbackfail virtual function. */
 129 typedef int (*_IO_pbackfail_t) __P((_IO_FILE*, int));
 130 #define _IO_PBACKFAIL(FP, CH) JUMP1(__pbackfail, FP, CH)
 131
 132 /* The 'xsputn' hook writes upto N characters from buffer DATA.
 133    Returns the number of character actually written.
 134    It matches the streambuf::xsputn virtual function. */
 135 typedef _IO_size_t (*_IO_xsputn_t)
 136   __P((_IO_FILE *FP, const void *DATA, _IO_size_t N));
 137 #define _IO_XSPUTN(FP, DATA, N) JUMP2(__xsputn, FP, DATA, N)
 138
 139 /* The 'xsgetn' hook reads upto N characters into buffer DATA.
 140    Returns the number of character actually read.
 141    It matches the streambuf::xsgetn virtual function. */
 142 typedef _IO_size_t (*_IO_xsgetn_t) __P((_IO_FILE*FP, void*DATA, _IO_size_t N));
 143 #define _IO_XSGETN(FP, DATA, N) JUMP2(__xsgetn, FP, DATA, N)
 144
 145 /* The 'seekoff' hook moves the stream position to a new position
 146    relative to the start of the file (if DIR==0), the current position
 147    (MODE==1), or the end of the file (MODE==2).
 148    It matches the streambuf::seekoff virtual function.
 149    It is also used for the ANSI fseek function. */
 150 typedef _IO_fpos_t (*_IO_seekoff_t)
 151   __P((_IO_FILE* FP, _IO_off_t OFF, int DIR, int MODE));
 152 #define _IO_SEEKOFF(FP, OFF, DIR, MODE) JUMP3(__seekoff, FP, OFF, DIR, MODE)
 153
 154 /* The 'seekpos' hook also moves the stream position,
 155    but to an absolute position given by a fpos_t (seekpos).
 156    It matches the streambuf::seekpos virtual function.
 157    It is also used for the ANSI fgetpos and fsetpos functions.  */
 158 /* The _IO_seek_cur and _IO_seek_end options are not allowed. */
 159 typedef _IO_fpos_t (*_IO_seekpos_t) __P((_IO_FILE*, _IO_fpos_t, int));
 160 #define _IO_SEEKPOS(FP, POS, FLAGS) JUMP2(__seekpos, FP, POS, FLAGS)
 161
 162 /* The 'setbuf' hook gives a buffer to the file.
 163    It matches the streambuf::setbuf virtual function. */
 164 typedef _IO_FILE* (*_IO_setbuf_t) __P((_IO_FILE*, char *, _IO_ssize_t));
 165 #define _IO_SETBUF(FP, BUFFER, LENGTH) JUMP2(__setbuf, FP, BUFFER, LENGTH)
 166
 167 /* The 'sync' hook attempts to synchronize the internal data structures
 168    of the file with the external state.
 169    It matches the streambuf::sync virtual function. */
 170 typedef int (*_IO_sync_t) __P((_IO_FILE*));
 171 #define _IO_SYNC(FP) JUMP0(__sync, FP)
 172
 173 /* The 'doallocate' hook is used to tell the file to allocate a buffer.
 174    It matches the streambuf::doallocate virtual function, which is not
 175    in the ANSI/ISO C++ standard, but is part traditional implementations. */
 176 typedef int (*_IO_doallocate_t) __P((_IO_FILE*));
 177 #define _IO_DOALLOCATE(FP) JUMP0(__doallocate, FP)
 178
 179 /* The following four hooks (sysread, syswrite, sysclose, sysseek, and
 180    sysstat) are low-level hooks specific to this implementation.
 181    There is no correspondence in the ANSI/ISO C++ standard library.
 182    The hooks basically correspond to the Unix system functions
 183    (read, write, close, lseek, and stat) except that a _IO_FILE*
 184    parameter is used instead of a integer file descriptor;  the default
 185    implementation used for normal files just calls those functions.
 186    The advantage of overriding these functions instead of the higher-level
 187    ones (underflow, overflow etc) is that you can leave all the buffering
 188    higher-level functions.  */
 189
 190 /* The 'sysread' hook is used to read data from the external file into
 191    an existing buffer.  It generalizes the Unix read(2) function.
 192    It matches the streambuf::sys_read virtual function, which is
 193    specific to this implementation. */
 194 typedef _IO_ssize_t (*_IO_read_t) __P((_IO_FILE*, void*, _IO_ssize_t));
 195 #define _IO_SYSREAD(FP, DATA, LEN) JUMP2(__read, FP, DATA, LEN)
 196
 197 /* The 'syswrite' hook is used to write data from an existing buffer
 198    to an external file.  It generalizes the Unix write(2) function.
 199    It matches the streambuf::sys_write virtual function, which is
 200    specific to this implementation. */
 201 typedef _IO_ssize_t (*_IO_write_t) __P((_IO_FILE*,const void*,_IO_ssize_t));
 202 #define _IO_SYSWRITE(FP, DATA, LEN) JUMP2(__write, FP, DATA, LEN)
 203
 204 /* The 'sysseek' hook is used to re-position an external file.
 205    It generalizes the Unix lseek(2) function.
 206    It matches the streambuf::sys_seek virtual function, which is
 207    specific to this implementation. */
 208 typedef _IO_fpos_t (*_IO_seek_t) __P((_IO_FILE*, _IO_off_t, int));
 209 #define _IO_SYSSEEK(FP, OFFSET, MODE) JUMP2(__seek, FP, OFFSET, MODE)
 210
 211 /* The 'sysclose' hook is used to finalize (close, finish up) an
 212    external file.  It generalizes the Unix close(2) function.
 213    It matches the streambuf::sys_close virtual function, which is
 214    specific to this implementation. */
 215 typedef int (*_IO_close_t) __P((_IO_FILE*)); /* finalize */
 216 #define _IO_SYSCLOSE(FP) JUMP0(__close, FP)
 217
 218 /* The 'sysstat' hook is used to get information about an external file
 219    into a struct stat buffer.  It generalizes the Unix fstat(2) call.
 220    It matches the streambuf::sys_stat virtual function, which is
 221    specific to this implementation. */
 222 typedef int (*_IO_stat_t) __P((_IO_FILE*, void*));
 223 #define _IO_SYSSTAT(FP, BUF) JUMP1(__stat, FP, BUF)
 224
 225
 226 #define _IO_CHAR_TYPE char /* unsigned char ? */
 227 #define _IO_INT_TYPE int
 228
 229 struct _IO_jump_t {
 230     JUMP_FIELD(_G_size_t, __dummy);
 231 #ifdef _G_USING_THUNKS
 232     JUMP_FIELD(_G_size_t, __dummy2);
 233 #endif
 234     JUMP_FIELD(_IO_finish_t, __finish);
 235     JUMP_FIELD(_IO_overflow_t, __overflow);
 236     JUMP_FIELD(_IO_underflow_t, __underflow);
 237     JUMP_FIELD(_IO_underflow_t, __uflow);
 238     JUMP_FIELD(_IO_pbackfail_t, __pbackfail);
 239     /* showmany */
 240     JUMP_FIELD(_IO_xsputn_t, __xsputn);
 241     JUMP_FIELD(_IO_xsgetn_t, __xsgetn);
 242     JUMP_FIELD(_IO_seekoff_t, __seekoff);
 243     JUMP_FIELD(_IO_seekpos_t, __seekpos);
 244     JUMP_FIELD(_IO_setbuf_t, __setbuf);
 245     JUMP_FIELD(_IO_sync_t, __sync);
 246     JUMP_FIELD(_IO_doallocate_t, __doallocate);
 247     JUMP_FIELD(_IO_read_t, __read);
 248     JUMP_FIELD(_IO_write_t, __write);
 249     JUMP_FIELD(_IO_seek_t, __seek);
 250     JUMP_FIELD(_IO_close_t, __close);
 251     JUMP_FIELD(_IO_stat_t, __stat);
 252 #if 0
 253     get_column;
 254     set_column;
 255 #endif
 256 };
 257
 258 /* We always allocate an extra word following an _IO_FILE.
 259    This contains a pointer to the function jump table used.
 260    This is for compatibility with C++ streambuf; the word can
 261    be used to smash to a pointer to a virtual function table. */
 262
 263 struct _IO_FILE_plus {
 264   _IO_FILE file;
 265   const struct _IO_jump_t *vtable;
 266 };
 267
 268 /* Generic functions */
 269
 270 extern _IO_fpos_t _IO_seekoff __P((_IO_FILE*, _IO_off_t, int, int));
 271 extern _IO_fpos_t _IO_seekpos __P((_IO_FILE*, _IO_fpos_t, int));
 272
 273 extern int _IO_switch_to_get_mode __P((_IO_FILE*));
 274 extern void _IO_init __P((_IO_FILE*, int));
 275 extern int _IO_sputbackc __P((_IO_FILE*, int));
 276 extern int _IO_sungetc __P((_IO_FILE*));
 277 extern void _IO_un_link __P((_IO_FILE*));
 278 extern void _IO_link_in __P((_IO_FILE *));
 279 extern void _IO_doallocbuf __P((_IO_FILE*));
 280 extern void _IO_unsave_markers __P((_IO_FILE*));
 281 extern void _IO_setb __P((_IO_FILE*, char*, char*, int));
 282 extern unsigned _IO_adjust_column __P((unsigned, const char *, int));
 283 #define _IO_sputn(__fp, __s, __n) _IO_XSPUTN(__fp, __s, __n)
 284
 285 /* Marker-related function. */
 286
 287 extern void _IO_init_marker __P((struct _IO_marker *, _IO_FILE *));
 288 extern void _IO_remove_marker __P((struct _IO_marker*));
 289 extern int _IO_marker_difference __P((struct _IO_marker *, struct _IO_marker *));
 290 extern int _IO_marker_delta __P((struct _IO_marker *));
 291 extern int _IO_seekmark __P((_IO_FILE *, struct _IO_marker *, int));
 292
 293 /* Default jumptable functions. */
 294
 295 extern int _IO_default_underflow __P((_IO_FILE*));
 296 extern int _IO_default_uflow __P((_IO_FILE*));
 297 extern int _IO_default_doallocate __P((_IO_FILE*));
 298 extern void _IO_default_finish __P((_IO_FILE *));
 299 extern int _IO_default_pbackfail __P((_IO_FILE*, int));
 300 extern _IO_FILE* _IO_default_setbuf __P((_IO_FILE *, char*, _IO_ssize_t));
 301 extern _IO_size_t _IO_default_xsputn __P((_IO_FILE *, const void*, _IO_size_t));
 302 extern _IO_size_t _IO_default_xsgetn __P((_IO_FILE *, void*, _IO_size_t));
 303 extern _IO_fpos_t _IO_default_seekoff __P((_IO_FILE*, _IO_off_t, int, int));
 304 extern _IO_fpos_t _IO_default_seekpos __P((_IO_FILE*, _IO_fpos_t, int));
 305 extern _IO_ssize_t _IO_default_write __P((_IO_FILE*,const void*,_IO_ssize_t));
 306 extern _IO_ssize_t _IO_default_read __P((_IO_FILE*, void*, _IO_ssize_t));
 307 extern int _IO_default_stat __P((_IO_FILE*, void*));
 308 extern _IO_fpos_t _IO_default_seek __P((_IO_FILE*, _IO_off_t, int));
 309 extern int _IO_default_sync __P((_IO_FILE*));
 310 #define _IO_default_close ((_IO_close_t)_IO_default_sync)
 311
 312 extern struct _IO_jump_t _IO_file_jumps;
 313 extern struct _IO_jump_t _IO_streambuf_jumps;
 314 extern struct _IO_jump_t _IO_proc_jumps;
 315 extern struct _IO_jump_t _IO_str_jumps;
 316 extern int _IO_do_write __P((_IO_FILE*, const char*, _IO_size_t));
 317 extern int _IO_flush_all __P((void));
 318 extern void _IO_cleanup __P((void));
 319 extern void _IO_flush_all_linebuffered __P((void));
 320
 321 #define _IO_do_flush(_f) \
 322   _IO_do_write(_f, (_f)->_IO_write_base, \
 323                (_f)->_IO_write_ptr-(_f)->_IO_write_base)
 324 #define _IO_in_put_mode(_fp) ((_fp)->_flags & _IO_CURRENTLY_PUTTING)
 325 #define _IO_mask_flags(fp, f, mask) \
 326        ((fp)->_flags = ((fp)->_flags & ~(mask)) | ((f) & (mask)))
 327 #define _IO_setg(fp, eb, g, eg)  ((fp)->_IO_read_base = (eb),\
 328         (fp)->_IO_read_ptr = (g), (fp)->_IO_read_end = (eg))
 329 #define _IO_setp(__fp, __p, __ep) \
 330        ((__fp)->_IO_write_base = (__fp)->_IO_write_ptr = __p, (__fp)->_IO_write_end = (__ep))
 331 #define _IO_have_backup(fp) ((fp)->_IO_save_base != NULL)
 332 #define _IO_in_backup(fp) ((fp)->_flags & _IO_IN_BACKUP)
 333 #define _IO_have_markers(fp) ((fp)->_markers != NULL)
 334 #define _IO_blen(fp) ((fp)->_IO_buf_end - (fp)->_IO_buf_base)
 335
 336 /* Jumptable functions for files. */
 337
 338 extern int _IO_file_doallocate __P((_IO_FILE*));
 339 extern _IO_FILE* _IO_file_setbuf __P((_IO_FILE *, char*, _IO_ssize_t));
 340 extern _IO_fpos_t _IO_file_seekoff __P((_IO_FILE*, _IO_off_t, int, int));
 341 extern _IO_size_t _IO_file_xsputn __P((_IO_FILE*,const void*,_IO_size_t));
 342 extern int _IO_file_stat __P((_IO_FILE*, void*));
 343 extern int _IO_file_close __P((_IO_FILE*));
 344 extern int _IO_file_underflow __P((_IO_FILE *));
 345 extern int _IO_file_overflow __P((_IO_FILE *, int));
 346 #define _IO_file_is_open(__fp) ((__fp)->_fileno >= 0)
 347 extern void _IO_file_init __P((_IO_FILE*));
 348 extern _IO_FILE* _IO_file_attach __P((_IO_FILE*, int));
 349 extern _IO_FILE* _IO_file_fopen __P((_IO_FILE*, const char*, const char*));
 350 extern _IO_ssize_t _IO_file_write __P((_IO_FILE*,const void*,_IO_ssize_t));
 351 extern _IO_ssize_t _IO_file_read __P((_IO_FILE*, void*, _IO_ssize_t));
 352 extern int _IO_file_sync __P((_IO_FILE*));
 353 extern int _IO_file_close_it __P((_IO_FILE*));
 354 extern _IO_fpos_t _IO_file_seek __P((_IO_FILE *, _IO_off_t, int));
 355 extern void _IO_file_finish __P((_IO_FILE*));
 356
 357 /* Other file functions. */
 358 extern _IO_FILE* _IO_file_attach __P((_IO_FILE *, int));
 359
 360 /* Jumptable functions for proc_files. */
 361 extern _IO_FILE* _IO_proc_open __P((_IO_FILE*, const char*, const char *));
 362 extern int _IO_proc_close __P((_IO_FILE*));
 363
 364 /* Jumptable functions for strfiles. */
 365 extern int _IO_str_underflow __P((_IO_FILE*));
 366 extern int _IO_str_overflow __P((_IO_FILE *, int));
 367 extern int _IO_str_pbackfail __P((_IO_FILE*, int));
 368 extern _IO_fpos_t _IO_str_seekoff __P((_IO_FILE*,_IO_off_t,int,int));
 369 extern void _IO_str_finish __P ((_IO_FILE*));
 370
 371 /* Other strfile functions */
 372 extern void _IO_str_init_static __P((_IO_FILE *, char*, int, char*));
 373 extern void _IO_str_init_readonly __P((_IO_FILE *, const char*, int));
 374 extern _IO_ssize_t _IO_str_count __P ((_IO_FILE*));
 375
 376 extern int _IO_vasprintf __P ((char **result_ptr, __const char *format,
 377                                _IO_va_list args));
 378 extern int _IO_vdprintf __P ((int d, __const char *format, _IO_va_list arg));
 379 extern int _IO_vsnprintf __P ((char *string, _IO_size_t maxlen,
 380                                __const char *format, _IO_va_list args));
 381
 382
 383 extern _IO_size_t _IO_getline __P((_IO_FILE*,char*,_IO_size_t,int,int));
 384 extern _IO_ssize_t _IO_getdelim __P((char**, _IO_size_t*, int, _IO_FILE*));
 385 extern double _IO_strtod __P((const char *, char **));
 386 extern char * _IO_dtoa __P((double __d, int __mode, int __ndigits,
 387                                 int *__decpt, int *__sign, char **__rve));
 388 extern int _IO_outfloat __P((double __value, _IO_FILE *__sb, int __type,
 389                                  int __width, int __precision, int __flags,
 390                                  int __sign_mode, int __fill));
 391
 392 extern _IO_FILE *_IO_list_all;
 393 extern void (*_IO_cleanup_registration_needed) __P ((void));
 394
 395 #ifndef EOF
 396 #define EOF (-1)
 397 #endif
 398 #ifndef NULL
 399 #if defined __GNUG__ && \
 400     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 8))
 401 #define NULL (__null)
 402 #else
 403 #if !defined(__cplusplus)
 404 #define NULL ((void*)0)
 405 #else
 406 #define NULL (0)
 407 #endif
 408 #endif
 409 #endif
 410
 411 #if _G_HAVE_MMAP
 412
 413 #include <unistd.h>
 414 #include <fcntl.h>
 415 #include <sys/mman.h>
 416 #include <sys/param.h>
 417
 418 #if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
 419 #define MAP_ANONYMOUS MAP_ANON
 420 #endif
 421
 422 #if !defined(MAP_ANONYMOUS) || !defined(EXEC_PAGESIZE)
 423 #undef _G_HAVE_MMAP
 424 #define _G_HAVE_MMAP 0
 425 #endif
 426
 427 #endif /* _G_HAVE_MMAP */
 428
 429 #if _G_HAVE_MMAP
 430
 431 #ifdef _LIBC
 432 /* When using this code in the GNU libc we must not pollute the name space.  */
 433 #define mmap __mmap
 434 #define munmap __munmap
 435 #endif
 436
 437 #define ROUND_TO_PAGE(_S) \
 438        (((_S) + EXEC_PAGESIZE - 1) & ~(EXEC_PAGESIZE - 1))
 439
 440 #define FREE_BUF(_B, _S) \
 441        munmap ((_B), ROUND_TO_PAGE (_S))
 442 #define ALLOC_BUF(_B, _S, _R) \
 443        do {                                                                   \
 444           (_B) = (char *) mmap (0, ROUND_TO_PAGE (_S),                        \
 445                                 PROT_READ | PROT_WRITE,                       \
 446                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);          \
 447           if ((_B) == (char *) -1)                                            \
 448             return (_R);                                                      \
 449        } while (0)
 450
 451 #else /* _G_HAVE_MMAP */
 452
 453 #define FREE_BUF(_B, _S) \
 454        free(_B)
 455 #define ALLOC_BUF(_B, _S, _R) \
 456        do {                                                                   \
 457           (_B) = (char*)malloc(_S);                                           \
 458           if ((_B) == NULL)                                                   \
 459             return (_R);                                                      \
 460        } while (0)
 461
 462 #endif /* _G_HAVE_MMAP */
 463
 464 #ifndef OS_FSTAT
 465 #define OS_FSTAT fstat
 466 #endif
 467 struct stat;
 468 extern _IO_ssize_t _IO_read __P((int, void*, _IO_size_t));
 469 extern _IO_ssize_t _IO_write __P((int, const void*, _IO_size_t));
 470 extern _IO_off_t _IO_lseek __P((int, _IO_off_t, int));
 471 extern int _IO_close __P((int));
 472 extern int _IO_fstat __P((int, struct stat *));
 473 extern int _IO_vscanf __P((const char *, _IO_va_list));
 474
 475 /* Operations on _IO_fpos_t.
 476    Normally, these are trivial, but we provide hooks for configurations
 477    where an _IO_fpos_t is a struct.
 478    Note that _IO_off_t must be an integral type. */
 479
 480 /* _IO_pos_BAD is an _IO_fpos_t value indicating error, unknown, or EOF. */
 481 #ifndef _IO_pos_BAD
 482 #define _IO_pos_BAD ((_IO_fpos_t)(-1))
 483 #endif
 484 /* _IO_pos_as_off converts an _IO_fpos_t value to an _IO_off_t value. */
 485 #ifndef _IO_pos_as_off
 486 #define _IO_pos_as_off(__pos) ((_IO_off_t)(__pos))
 487 #endif
 488 /* _IO_pos_adjust adjust an _IO_fpos_t by some number of bytes. */
 489 #ifndef _IO_pos_adjust
 490 #define _IO_pos_adjust(__pos, __delta) ((__pos) += (__delta))
 491 #endif
 492 /* _IO_pos_0 is an _IO_fpos_t value indicating beginning of file. */
 493 #ifndef _IO_pos_0
 494 #define _IO_pos_0 ((_IO_fpos_t)0)
 495 #endif
 496
 497 #ifdef __cplusplus
 498 }
 499 #endif
 500
 501 #ifdef _IO_MTSAFE_IO
 502 /* check following! */
 503 #define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
 504        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 505          0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD, \
 506            0, 0, 0, 0, { 0 }, &_IO_stdfile_##FD##_lock }
 507 #else
 508 /* check following! */
 509 #define FILEBUF_LITERAL(CHAIN, FLAGS, FD) \
 510        { _IO_MAGIC+_IO_LINKED+_IO_IS_FILEBUF+FLAGS, \
 511            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, CHAIN, FD }
 512 #endif
 513
 514 /* VTABLE_LABEL defines NAME as of the CLASS class.
 515    CNLENGTH is strlen(#CLASS).  */
 516 #ifdef __GNUC__
 517 #if _G_VTABLE_LABEL_HAS_LENGTH
 518 #define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 519   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CNLENGTH #CLASS);
 520 #else
 521 #define VTABLE_LABEL(NAME, CLASS, CNLENGTH) \
 522   extern char NAME[] asm (_G_VTABLE_LABEL_PREFIX #CLASS);
 523 #endif
 524 #endif /* __GNUC__ */
 525
 526 #if !defined(builtinbuf_vtable) && defined(__cplusplus)
 527 #ifdef __GNUC__
 528 VTABLE_LABEL(builtinbuf_vtable, builtinbuf, 10)
 529 #else
 530 #if _G_VTABLE_LABEL_HAS_LENGTH
 531 #define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##10builtinbuf
 532 #else
 533 #define builtinbuf_vtable _G_VTABLE_LABEL_PREFIX_ID##builtinbuf
 534 #endif
 535 #endif
 536 #endif /* !defined(builtinbuf_vtable) && defined(__cplusplus) */
 537
 538 #if defined(__STDC__) || defined(__cplusplus)
 539 #define _IO_va_start(args, last) va_start(args, last)
 540 #else
 541 #define _IO_va_start(args, last) va_start(args)
 542 #endif
 543
 544 extern struct _IO_fake_stdiobuf _IO_stdin_buf, _IO_stdout_buf, _IO_stderr_buf;
 545
 546 #if 1
 547 #define COERCE_FILE(FILE) /* Nothing */
 548 #else
 549 /* This is part of the kludge for binary compatibility with old stdio. */
 550 #define COERCE_FILE(FILE) \
 551   (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) == _OLD_MAGIC_MASK \
 552     && (FILE) = *(FILE**)&((int*)fp)[1])
 553 #endif
 554
 555 #ifdef EINVAL
 556 #define MAYBE_SET_EINVAL __set_errno (EINVAL)
 557 #else
 558 #define MAYBE_SET_EINVAL /* nothing */
 559 #endif
 560
 561 #ifdef IO_DEBUG
 562 #define CHECK_FILE(FILE,RET) \
 563         if ((FILE) == NULL) { MAYBE_SET_EINVAL; return RET; } \
 564         else { COERCE_FILE(FILE); \
 565                if (((FILE)->_IO_file_flags & _IO_MAGIC_MASK) != _IO_MAGIC) \
 566           { MAYBE_SET_EINVAL; return RET; }}
 567 #else
 568 #define CHECK_FILE(FILE,RET) \
 569         COERCE_FILE(FILE)
 570 #endif