gdb/ui-file.c

   1 /* UI_FILE - a generic STDIO like output stream.
   2
   3    Copyright (C) 1999-2015 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* Implement the ``struct ui_file'' object.  */
  21
  22 #include "defs.h"
  23 #include "ui-file.h"
  24 #include "gdb_obstack.h"
  25 #include "gdb_select.h"
  26 #include "filestuff.h"
  27
  28 static ui_file_isatty_ftype null_file_isatty;
  29 static ui_file_write_ftype null_file_write;
  30 static ui_file_write_ftype null_file_write_async_safe;
  31 static ui_file_fputs_ftype null_file_fputs;
  32 static ui_file_read_ftype null_file_read;
  33 static ui_file_flush_ftype null_file_flush;
  34 static ui_file_delete_ftype null_file_delete;
  35 static ui_file_rewind_ftype null_file_rewind;
  36 static ui_file_put_ftype null_file_put;
  37 static ui_file_fseek_ftype null_file_fseek;
  38
  39 struct ui_file
  40   {
  41     int *magic;
  42     ui_file_flush_ftype *to_flush;
  43     ui_file_write_ftype *to_write;
  44     ui_file_write_async_safe_ftype *to_write_async_safe;
  45     ui_file_fputs_ftype *to_fputs;
  46     ui_file_read_ftype *to_read;
  47     ui_file_delete_ftype *to_delete;
  48     ui_file_isatty_ftype *to_isatty;
  49     ui_file_rewind_ftype *to_rewind;
  50     ui_file_put_ftype *to_put;
  51     ui_file_fseek_ftype *to_fseek;
  52     void *to_data;
  53   };
  54 int ui_file_magic;
  55
  56 struct ui_file *
  57 ui_file_new (void)
  58 {
  59   struct ui_file *file = XNEW (struct ui_file);
  60
  61   file->magic = &ui_file_magic;
  62   set_ui_file_data (file, NULL, null_file_delete);
  63   set_ui_file_flush (file, null_file_flush);
  64   set_ui_file_write (file, null_file_write);
  65   set_ui_file_write_async_safe (file, null_file_write_async_safe);
  66   set_ui_file_fputs (file, null_file_fputs);
  67   set_ui_file_read (file, null_file_read);
  68   set_ui_file_isatty (file, null_file_isatty);
  69   set_ui_file_rewind (file, null_file_rewind);
  70   set_ui_file_put (file, null_file_put);
  71   set_ui_file_fseek (file, null_file_fseek);
  72   return file;
  73 }
  74
  75 void
  76 ui_file_delete (struct ui_file *file)
  77 {
  78   file->to_delete (file);
  79   xfree (file);
  80 }
  81
  82 static int
  83 null_file_isatty (struct ui_file *file)
  84 {
  85   return 0;
  86 }
  87
  88 static void
  89 null_file_rewind (struct ui_file *file)
  90 {
  91   return;
  92 }
  93
  94 static void
  95 null_file_put (struct ui_file *file,
  96                ui_file_put_method_ftype *write,
  97                void *dest)
  98 {
  99   return;
 100 }
 101
 102 static void
 103 null_file_flush (struct ui_file *file)
 104 {
 105   return;
 106 }
 107
 108 static void
 109 null_file_write (struct ui_file *file,
 110                  const char *buf,
 111                  long sizeof_buf)
 112 {
 113   if (file->to_fputs == null_file_fputs)
 114     /* Both the write and fputs methods are null.  Discard the
 115        request.  */
 116     return;
 117   else
 118     {
 119       /* The fputs method isn't null, slowly pass the write request
 120          onto that.  FYI, this isn't as bad as it may look - the
 121          current (as of 1999-11-07) printf_* function calls fputc and
 122          fputc does exactly the below.  By having a write function it
 123          is possible to clean up that code.  */
 124       int i;
 125       char b[2];
 126
 127       b[1] = '\0';
 128       for (i = 0; i < sizeof_buf; i++)
 129         {
 130           b[0] = buf[i];
 131           file->to_fputs (b, file);
 132         }
 133       return;
 134     }
 135 }
 136
 137 static long
 138 null_file_read (struct ui_file *file,
 139                 char *buf,
 140                 long sizeof_buf)
 141 {
 142   errno = EBADF;
 143   return 0;
 144 }
 145
 146 static void
 147 null_file_fputs (const char *buf, struct ui_file *file)
 148 {
 149   if (file->to_write == null_file_write)
 150     /* Both the write and fputs methods are null.  Discard the
 151        request.  */
 152     return;
 153   else
 154     {
 155       /* The write method was implemented, use that.  */
 156       file->to_write (file, buf, strlen (buf));
 157     }
 158 }
 159
 160 static void
 161 null_file_write_async_safe (struct ui_file *file,
 162                             const char *buf,
 163                             long sizeof_buf)
 164 {
 165   return;
 166 }
 167
 168 static void
 169 null_file_delete (struct ui_file *file)
 170 {
 171   return;
 172 }
 173
 174 static int
 175 null_file_fseek (struct ui_file *stream, long offset, int whence)
 176 {
 177   errno = EBADF;
 178
 179   return -1;
 180 }
 181
 182 void *
 183 ui_file_data (struct ui_file *file)
 184 {
 185   if (file->magic != &ui_file_magic)
 186     internal_error (__FILE__, __LINE__,
 187                     _("ui_file_data: bad magic number"));
 188   return file->to_data;
 189 }
 190
 191 void
 192 gdb_flush (struct ui_file *file)
 193 {
 194   file->to_flush (file);
 195 }
 196
 197 int
 198 ui_file_isatty (struct ui_file *file)
 199 {
 200   return file->to_isatty (file);
 201 }
 202
 203 void
 204 ui_file_rewind (struct ui_file *file)
 205 {
 206   file->to_rewind (file);
 207 }
 208
 209 void
 210 ui_file_put (struct ui_file *file,
 211               ui_file_put_method_ftype *write,
 212               void *dest)
 213 {
 214   file->to_put (file, write, dest);
 215 }
 216
 217 void
 218 ui_file_write (struct ui_file *file,
 219                 const char *buf,
 220                 long length_buf)
 221 {
 222   file->to_write (file, buf, length_buf);
 223 }
 224
 225 void
 226 ui_file_write_for_put (void *data, const char *buffer, long length_buffer)
 227 {
 228   ui_file_write (data, buffer, length_buffer);
 229 }
 230
 231 void
 232 ui_file_write_async_safe (struct ui_file *file,
 233                           const char *buf,
 234                           long length_buf)
 235 {
 236   file->to_write_async_safe (file, buf, length_buf);
 237 }
 238
 239 long
 240 ui_file_read (struct ui_file *file, char *buf, long length_buf)
 241 {
 242   return file->to_read (file, buf, length_buf);
 243 }
 244
 245 int
 246 ui_file_fseek (struct ui_file *file, long offset, int whence)
 247 {
 248   return file->to_fseek (file, offset, whence);
 249 }
 250
 251 void
 252 fputs_unfiltered (const char *buf, struct ui_file *file)
 253 {
 254   file->to_fputs (buf, file);
 255 }
 256
 257 void
 258 set_ui_file_flush (struct ui_file *file, ui_file_flush_ftype *flush_ptr)
 259 {
 260   file->to_flush = flush_ptr;
 261 }
 262
 263 void
 264 set_ui_file_isatty (struct ui_file *file, ui_file_isatty_ftype *isatty_ptr)
 265 {
 266   file->to_isatty = isatty_ptr;
 267 }
 268
 269 void
 270 set_ui_file_rewind (struct ui_file *file, ui_file_rewind_ftype *rewind_ptr)
 271 {
 272   file->to_rewind = rewind_ptr;
 273 }
 274
 275 void
 276 set_ui_file_put (struct ui_file *file, ui_file_put_ftype *put_ptr)
 277 {
 278   file->to_put = put_ptr;
 279 }
 280
 281 void
 282 set_ui_file_write (struct ui_file *file,
 283                     ui_file_write_ftype *write_ptr)
 284 {
 285   file->to_write = write_ptr;
 286 }
 287
 288 void
 289 set_ui_file_write_async_safe (struct ui_file *file,
 290                               ui_file_write_async_safe_ftype *write_async_safe_ptr)
 291 {
 292   file->to_write_async_safe = write_async_safe_ptr;
 293 }
 294
 295 void
 296 set_ui_file_read (struct ui_file *file, ui_file_read_ftype *read_ptr)
 297 {
 298   file->to_read = read_ptr;
 299 }
 300
 301 void
 302 set_ui_file_fputs (struct ui_file *file, ui_file_fputs_ftype *fputs_ptr)
 303 {
 304   file->to_fputs = fputs_ptr;
 305 }
 306
 307 void
 308 set_ui_file_fseek (struct ui_file *file, ui_file_fseek_ftype *fseek_ptr)
 309 {
 310   file->to_fseek = fseek_ptr;
 311 }
 312
 313 void
 314 set_ui_file_data (struct ui_file *file, void *data,
 315                   ui_file_delete_ftype *delete_ptr)
 316 {
 317   file->to_data = data;
 318   file->to_delete = delete_ptr;
 319 }
 320
 321 /* ui_file utility function for converting a ``struct ui_file'' into
 322    a memory buffer.  */
 323
 324 struct accumulated_ui_file
 325 {
 326   char *buffer;
 327   long length;
 328 };
 329
 330 static void
 331 do_ui_file_xstrdup (void *context, const char *buffer, long length)
 332 {
 333   struct accumulated_ui_file *acc = context;
 334
 335   if (acc->buffer == NULL)
 336     acc->buffer = xmalloc (length + 1);
 337   else
 338     acc->buffer = xrealloc (acc->buffer, acc->length + length + 1);
 339   memcpy (acc->buffer + acc->length, buffer, length);
 340   acc->length += length;
 341   acc->buffer[acc->length] = '\0';
 342 }
 343
 344 char *
 345 ui_file_xstrdup (struct ui_file *file, long *length)
 346 {
 347   struct accumulated_ui_file acc;
 348
 349   acc.buffer = NULL;
 350   acc.length = 0;
 351   ui_file_put (file, do_ui_file_xstrdup, &acc);
 352   if (acc.buffer == NULL)
 353     acc.buffer = xstrdup ("");
 354   if (length != NULL)
 355     *length = acc.length;
 356   return acc.buffer;
 357 }
 358
 359 static void
 360 do_ui_file_obsavestring (void *context, const char *buffer, long length)
 361 {
 362   struct obstack *obstack = (struct obstack *) context;
 363
 364   obstack_grow (obstack, buffer, length);
 365 }
 366
 367 char *
 368 ui_file_obsavestring (struct ui_file *file, struct obstack *obstack,
 369                       long *length)
 370 {
 371   ui_file_put (file, do_ui_file_obsavestring, obstack);
 372   *length = obstack_object_size (obstack);
 373   obstack_1grow (obstack, '\0');
 374   return obstack_finish (obstack);
 375 }
 376 \f
 377 /* A pure memory based ``struct ui_file'' that can be used an output
 378    buffer.  The buffers accumulated contents are available via
 379    ui_file_put().  */
 380
 381 struct mem_file
 382   {
 383     int *magic;
 384     char *buffer;
 385     int sizeof_buffer;
 386     int length_buffer;
 387   };
 388
 389 static ui_file_rewind_ftype mem_file_rewind;
 390 static ui_file_put_ftype mem_file_put;
 391 static ui_file_write_ftype mem_file_write;
 392 static ui_file_delete_ftype mem_file_delete;
 393 static struct ui_file *mem_file_new (void);
 394 static int mem_file_magic;
 395
 396 static struct ui_file *
 397 mem_file_new (void)
 398 {
 399   struct mem_file *stream = XNEW (struct mem_file);
 400   struct ui_file *file = ui_file_new ();
 401
 402   set_ui_file_data (file, stream, mem_file_delete);
 403   set_ui_file_rewind (file, mem_file_rewind);
 404   set_ui_file_put (file, mem_file_put);
 405   set_ui_file_write (file, mem_file_write);
 406   stream->magic = &mem_file_magic;
 407   stream->buffer = NULL;
 408   stream->sizeof_buffer = 0;
 409   stream->length_buffer = 0;
 410   return file;
 411 }
 412
 413 static void
 414 mem_file_delete (struct ui_file *file)
 415 {
 416   struct mem_file *stream = ui_file_data (file);
 417
 418   if (stream->magic != &mem_file_magic)
 419     internal_error (__FILE__, __LINE__,
 420                     _("mem_file_delete: bad magic number"));
 421   if (stream->buffer != NULL)
 422     xfree (stream->buffer);
 423   xfree (stream);
 424 }
 425
 426 struct ui_file *
 427 mem_fileopen (void)
 428 {
 429   return mem_file_new ();
 430 }
 431
 432 static void
 433 mem_file_rewind (struct ui_file *file)
 434 {
 435   struct mem_file *stream = ui_file_data (file);
 436
 437   if (stream->magic != &mem_file_magic)
 438     internal_error (__FILE__, __LINE__,
 439                     _("mem_file_rewind: bad magic number"));
 440   stream->length_buffer = 0;
 441 }
 442
 443 static void
 444 mem_file_put (struct ui_file *file,
 445               ui_file_put_method_ftype *write,
 446               void *dest)
 447 {
 448   struct mem_file *stream = ui_file_data (file);
 449
 450   if (stream->magic != &mem_file_magic)
 451     internal_error (__FILE__, __LINE__,
 452                     _("mem_file_put: bad magic number"));
 453   if (stream->length_buffer > 0)
 454     write (dest, stream->buffer, stream->length_buffer);
 455 }
 456
 457 void
 458 mem_file_write (struct ui_file *file,
 459                 const char *buffer,
 460                 long length_buffer)
 461 {
 462   struct mem_file *stream = ui_file_data (file);
 463
 464   if (stream->magic != &mem_file_magic)
 465     internal_error (__FILE__, __LINE__,
 466                     _("mem_file_write: bad magic number"));
 467   if (stream->buffer == NULL)
 468     {
 469       stream->length_buffer = length_buffer;
 470       stream->sizeof_buffer = length_buffer;
 471       stream->buffer = xmalloc (stream->sizeof_buffer);
 472       memcpy (stream->buffer, buffer, length_buffer);
 473     }
 474   else
 475     {
 476       int new_length = stream->length_buffer + length_buffer;
 477
 478       if (new_length >= stream->sizeof_buffer)
 479         {
 480           stream->sizeof_buffer = new_length;
 481           stream->buffer = xrealloc (stream->buffer, stream->sizeof_buffer);
 482         }
 483       memcpy (stream->buffer + stream->length_buffer, buffer, length_buffer);
 484       stream->length_buffer = new_length;
 485     }
 486 }
 487 \f
 488 /* ``struct ui_file'' implementation that maps directly onto
 489    <stdio.h>'s FILE.  */
 490
 491 static ui_file_write_ftype stdio_file_write;
 492 static ui_file_write_async_safe_ftype stdio_file_write_async_safe;
 493 static ui_file_fputs_ftype stdio_file_fputs;
 494 static ui_file_read_ftype stdio_file_read;
 495 static ui_file_isatty_ftype stdio_file_isatty;
 496 static ui_file_delete_ftype stdio_file_delete;
 497 static struct ui_file *stdio_file_new (FILE *file, int close_p);
 498 static ui_file_flush_ftype stdio_file_flush;
 499 static ui_file_fseek_ftype stdio_file_fseek;
 500
 501 static int stdio_file_magic;
 502
 503 struct stdio_file
 504   {
 505     int *magic;
 506     FILE *file;
 507     /* The associated file descriptor is extracted ahead of time for
 508        stdio_file_write_async_safe's benefit, in case fileno isn't async-safe.  */
 509     int fd;
 510     int close_p;
 511   };
 512
 513 static struct ui_file *
 514 stdio_file_new (FILE *file, int close_p)
 515 {
 516   struct ui_file *ui_file = ui_file_new ();
 517   struct stdio_file *stdio = XNEW (struct stdio_file);
 518
 519   stdio->magic = &stdio_file_magic;
 520   stdio->file = file;
 521   stdio->fd = fileno (file);
 522   stdio->close_p = close_p;
 523   set_ui_file_data (ui_file, stdio, stdio_file_delete);
 524   set_ui_file_flush (ui_file, stdio_file_flush);
 525   set_ui_file_write (ui_file, stdio_file_write);
 526   set_ui_file_write_async_safe (ui_file, stdio_file_write_async_safe);
 527   set_ui_file_fputs (ui_file, stdio_file_fputs);
 528   set_ui_file_read (ui_file, stdio_file_read);
 529   set_ui_file_isatty (ui_file, stdio_file_isatty);
 530   set_ui_file_fseek (ui_file, stdio_file_fseek);
 531   return ui_file;
 532 }
 533
 534 static void
 535 stdio_file_delete (struct ui_file *file)
 536 {
 537   struct stdio_file *stdio = ui_file_data (file);
 538
 539   if (stdio->magic != &stdio_file_magic)
 540     internal_error (__FILE__, __LINE__,
 541                     _("stdio_file_delete: bad magic number"));
 542   if (stdio->close_p)
 543     {
 544       fclose (stdio->file);
 545     }
 546   xfree (stdio);
 547 }
 548
 549 static void
 550 stdio_file_flush (struct ui_file *file)
 551 {
 552   struct stdio_file *stdio = ui_file_data (file);
 553
 554   if (stdio->magic != &stdio_file_magic)
 555     internal_error (__FILE__, __LINE__,
 556                     _("stdio_file_flush: bad magic number"));
 557   fflush (stdio->file);
 558 }
 559
 560 static long
 561 stdio_file_read (struct ui_file *file, char *buf, long length_buf)
 562 {
 563   struct stdio_file *stdio = ui_file_data (file);
 564
 565   if (stdio->magic != &stdio_file_magic)
 566     internal_error (__FILE__, __LINE__,
 567                     _("stdio_file_read: bad magic number"));
 568
 569   /* For the benefit of Windows, call gdb_select before reading from
 570      the file.  Wait until at least one byte of data is available.
 571      Control-C can interrupt gdb_select, but not read.  */
 572   {
 573     fd_set readfds;
 574     FD_ZERO (&readfds);
 575     FD_SET (stdio->fd, &readfds);
 576     if (gdb_select (stdio->fd + 1, &readfds, NULL, NULL, NULL) == -1)
 577       return -1;
 578   }
 579
 580   return read (stdio->fd, buf, length_buf);
 581 }
 582
 583 static void
 584 stdio_file_write (struct ui_file *file, const char *buf, long length_buf)
 585 {
 586   struct stdio_file *stdio = ui_file_data (file);
 587
 588   if (stdio->magic != &stdio_file_magic)
 589     internal_error (__FILE__, __LINE__,
 590                     _("stdio_file_write: bad magic number"));
 591   /* Calling error crashes when we are called from the exception framework.  */
 592   if (fwrite (buf, length_buf, 1, stdio->file))
 593     {
 594       /* Nothing.  */
 595     }
 596 }
 597
 598 static void
 599 stdio_file_write_async_safe (struct ui_file *file,
 600                              const char *buf, long length_buf)
 601 {
 602   struct stdio_file *stdio = ui_file_data (file);
 603
 604   if (stdio->magic != &stdio_file_magic)
 605     {
 606       /* gettext isn't necessarily async safe, so we can't use _("error message") here.
 607          We could extract the correct translation ahead of time, but this is an extremely
 608          rare event, and one of the other stdio_file_* routines will presumably catch
 609          the problem anyway.  For now keep it simple and ignore the error here.  */
 610       return;
 611     }
 612
 613   /* This is written the way it is to avoid a warning from gcc about not using the
 614      result of write (since it can be declared with attribute warn_unused_result).
 615      Alas casting to void doesn't work for this.  */
 616   if (write (stdio->fd, buf, length_buf))
 617     {
 618       /* Nothing.  */
 619     }
 620 }
 621
 622 static void
 623 stdio_file_fputs (const char *linebuffer, struct ui_file *file)
 624 {
 625   struct stdio_file *stdio = ui_file_data (file);
 626
 627   if (stdio->magic != &stdio_file_magic)
 628     internal_error (__FILE__, __LINE__,
 629                     _("stdio_file_fputs: bad magic number"));
 630   /* Calling error crashes when we are called from the exception framework.  */
 631   if (fputs (linebuffer, stdio->file))
 632     {
 633       /* Nothing.  */
 634     }
 635 }
 636
 637 static int
 638 stdio_file_isatty (struct ui_file *file)
 639 {
 640   struct stdio_file *stdio = ui_file_data (file);
 641
 642   if (stdio->magic != &stdio_file_magic)
 643     internal_error (__FILE__, __LINE__,
 644                     _("stdio_file_isatty: bad magic number"));
 645   return (isatty (stdio->fd));
 646 }
 647
 648 static int
 649 stdio_file_fseek (struct ui_file *file, long offset, int whence)
 650 {
 651   struct stdio_file *stdio = ui_file_data (file);
 652
 653   if (stdio->magic != &stdio_file_magic)
 654     internal_error (__FILE__, __LINE__,
 655                     _("stdio_file_fseek: bad magic number"));
 656
 657   return fseek (stdio->file, offset, whence);
 658 }
 659
 660 #ifdef __MINGW32__
 661 /* This is the implementation of ui_file method to_write for stderr.
 662    gdb_stdout is flushed before writing to gdb_stderr.  */
 663
 664 static void
 665 stderr_file_write (struct ui_file *file, const char *buf, long length_buf)
 666 {
 667   gdb_flush (gdb_stdout);
 668   stdio_file_write (file, buf, length_buf);
 669 }
 670
 671 /* This is the implementation of ui_file method to_fputs for stderr.
 672    gdb_stdout is flushed before writing to gdb_stderr.  */
 673
 674 static void
 675 stderr_file_fputs (const char *linebuffer, struct ui_file *file)
 676 {
 677   gdb_flush (gdb_stdout);
 678   stdio_file_fputs (linebuffer, file);
 679 }
 680 #endif
 681
 682 struct ui_file *
 683 stderr_fileopen (void)
 684 {
 685   struct ui_file *ui_file = stdio_fileopen (stderr);
 686
 687 #ifdef __MINGW32__
 688   /* There is no real line-buffering on Windows, see
 689      http://msdn.microsoft.com/en-us/library/86cebhfs%28v=vs.71%29.aspx
 690      so the stdout is either fully-buffered or non-buffered.  We can't
 691      make stdout non-buffered, because of two concerns,
 692      1.  non-buffering hurts performance,
 693      2.  non-buffering may change GDB's behavior when it is interacting
 694      with front-end, such as Emacs.
 695
 696      We decided to leave stdout as fully buffered, but flush it first
 697      when something is written to stderr.  */
 698
 699   /* Method 'to_write_async_safe' is not overwritten, because there's
 700      no way to flush a stream in an async-safe manner.  Fortunately,
 701      it doesn't really matter, because:
 702      - that method is only used for printing internal debug output
 703        from signal handlers.
 704      - Windows hosts don't have a concept of async-safeness.  Signal
 705        handlers run in a separate thread, so they can call
 706        the regular non-async-safe output routines freely.  */
 707   set_ui_file_write (ui_file, stderr_file_write);
 708   set_ui_file_fputs (ui_file, stderr_file_fputs);
 709 #endif
 710
 711   return ui_file;
 712 }
 713
 714 /* Like fdopen().  Create a ui_file from a previously opened FILE.  */
 715
 716 struct ui_file *
 717 stdio_fileopen (FILE *file)
 718 {
 719   return stdio_file_new (file, 0);
 720 }
 721
 722 struct ui_file *
 723 gdb_fopen (const char *name, const char *mode)
 724 {
 725   FILE *f = gdb_fopen_cloexec (name, mode);
 726
 727   if (f == NULL)
 728     return NULL;
 729   return stdio_file_new (f, 1);
 730 }
 731
 732 /* ``struct ui_file'' implementation that maps onto two ui-file objects.  */
 733
 734 static ui_file_write_ftype tee_file_write;
 735 static ui_file_fputs_ftype tee_file_fputs;
 736 static ui_file_isatty_ftype tee_file_isatty;
 737 static ui_file_delete_ftype tee_file_delete;
 738 static ui_file_flush_ftype tee_file_flush;
 739
 740 static int tee_file_magic;
 741
 742 struct tee_file
 743   {
 744     int *magic;
 745     struct ui_file *one, *two;
 746     int close_one, close_two;
 747   };
 748
 749 struct ui_file *
 750 tee_file_new (struct ui_file *one, int close_one,
 751               struct ui_file *two, int close_two)
 752 {
 753   struct ui_file *ui_file = ui_file_new ();
 754   struct tee_file *tee = XNEW (struct tee_file);
 755
 756   tee->magic = &tee_file_magic;
 757   tee->one = one;
 758   tee->two = two;
 759   tee->close_one = close_one;
 760   tee->close_two = close_two;
 761   set_ui_file_data (ui_file, tee, tee_file_delete);
 762   set_ui_file_flush (ui_file, tee_file_flush);
 763   set_ui_file_write (ui_file, tee_file_write);
 764   set_ui_file_fputs (ui_file, tee_file_fputs);
 765   set_ui_file_isatty (ui_file, tee_file_isatty);
 766   return ui_file;
 767 }
 768
 769 static void
 770 tee_file_delete (struct ui_file *file)
 771 {
 772   struct tee_file *tee = ui_file_data (file);
 773
 774   if (tee->magic != &tee_file_magic)
 775     internal_error (__FILE__, __LINE__,
 776                     _("tee_file_delete: bad magic number"));
 777   if (tee->close_one)
 778     ui_file_delete (tee->one);
 779   if (tee->close_two)
 780     ui_file_delete (tee->two);
 781
 782   xfree (tee);
 783 }
 784
 785 static void
 786 tee_file_flush (struct ui_file *file)
 787 {
 788   struct tee_file *tee = ui_file_data (file);
 789
 790   if (tee->magic != &tee_file_magic)
 791     internal_error (__FILE__, __LINE__,
 792                     _("tee_file_flush: bad magic number"));
 793   tee->one->to_flush (tee->one);
 794   tee->two->to_flush (tee->two);
 795 }
 796
 797 static void
 798 tee_file_write (struct ui_file *file, const char *buf, long length_buf)
 799 {
 800   struct tee_file *tee = ui_file_data (file);
 801
 802   if (tee->magic != &tee_file_magic)
 803     internal_error (__FILE__, __LINE__,
 804                     _("tee_file_write: bad magic number"));
 805   ui_file_write (tee->one, buf, length_buf);
 806   ui_file_write (tee->two, buf, length_buf);
 807 }
 808
 809 static void
 810 tee_file_fputs (const char *linebuffer, struct ui_file *file)
 811 {
 812   struct tee_file *tee = ui_file_data (file);
 813
 814   if (tee->magic != &tee_file_magic)
 815     internal_error (__FILE__, __LINE__,
 816                     _("tee_file_fputs: bad magic number"));
 817   tee->one->to_fputs (linebuffer, tee->one);
 818   tee->two->to_fputs (linebuffer, tee->two);
 819 }
 820
 821 static int
 822 tee_file_isatty (struct ui_file *file)
 823 {
 824   struct tee_file *tee = ui_file_data (file);
 825
 826   if (tee->magic != &tee_file_magic)
 827     internal_error (__FILE__, __LINE__,
 828                     _("tee_file_isatty: bad magic number"));
 829
 830   return ui_file_isatty (tee->one);
 831 }