gdb/ui-file.c

   1 /* UI_FILE - a generic STDIO like output stream.
   2
   3    Copyright 1999, 2000, 2001, 2002 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 2 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, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 /* Implement the ``struct ui_file'' object. */
  23
  24 #include "defs.h"
  25 #include "ui-file.h"
  26 #include "gdb_string.h"
  27
  28 static ui_file_isatty_ftype null_file_isatty;
  29 static ui_file_write_ftype null_file_write;
  30 static ui_file_fputs_ftype null_file_fputs;
  31 static ui_file_flush_ftype null_file_flush;
  32 static ui_file_delete_ftype null_file_delete;
  33 static ui_file_rewind_ftype null_file_rewind;
  34 static ui_file_put_ftype null_file_put;
  35
  36 struct ui_file
  37   {
  38     int *magic;
  39     ui_file_flush_ftype *to_flush;
  40     ui_file_write_ftype *to_write;
  41     ui_file_fputs_ftype *to_fputs;
  42     ui_file_delete_ftype *to_delete;
  43     ui_file_isatty_ftype *to_isatty;
  44     ui_file_rewind_ftype *to_rewind;
  45     ui_file_put_ftype *to_put;
  46     void *to_data;
  47   };
  48 int ui_file_magic;
  49
  50 struct ui_file *
  51 ui_file_new (void)
  52 {
  53   struct ui_file *file = xmalloc (sizeof (struct ui_file));
  54   file->magic = &ui_file_magic;
  55   set_ui_file_data (file, NULL, null_file_delete);
  56   set_ui_file_flush (file, null_file_flush);
  57   set_ui_file_write (file, null_file_write);
  58   set_ui_file_fputs (file, null_file_fputs);
  59   set_ui_file_isatty (file, null_file_isatty);
  60   set_ui_file_rewind (file, null_file_rewind);
  61   set_ui_file_put (file, null_file_put);
  62   return file;
  63 }
  64
  65 void
  66 ui_file_delete (struct ui_file *file)
  67 {
  68   file->to_delete (file);
  69   xfree (file);
  70 }
  71
  72 static int
  73 null_file_isatty (struct ui_file *file)
  74 {
  75   return 0;
  76 }
  77
  78 static void
  79 null_file_rewind (struct ui_file *file)
  80 {
  81   return;
  82 }
  83
  84 static void
  85 null_file_put (struct ui_file *file,
  86                ui_file_put_method_ftype *write,
  87                void *dest)
  88 {
  89   return;
  90 }
  91
  92 static void
  93 null_file_flush (struct ui_file *file)
  94 {
  95   return;
  96 }
  97
  98 static void
  99 null_file_write (struct ui_file *file,
 100                  const char *buf,
 101                  long sizeof_buf)
 102 {
 103   if (file->to_fputs == null_file_fputs)
 104     /* Both the write and fputs methods are null. Discard the
 105        request. */
 106     return;
 107   else
 108     {
 109       /* The fputs method isn't null, slowly pass the write request
 110          onto that.  FYI, this isn't as bad as it may look - the
 111          current (as of 1999-11-07) printf_* function calls fputc and
 112          fputc does exactly the below.  By having a write function it
 113          is possible to clean up that code.  */
 114       int i;
 115       char b[2];
 116       b[1] = '\0';
 117       for (i = 0; i < sizeof_buf; i++)
 118         {
 119           b[0] = buf[i];
 120           file->to_fputs (b, file);
 121         }
 122       return;
 123     }
 124 }
 125
 126 static void
 127 null_file_fputs (const char *buf, struct ui_file *file)
 128 {
 129   if (file->to_write == null_file_write)
 130     /* Both the write and fputs methods are null. Discard the
 131        request. */
 132     return;
 133   else
 134     {
 135       /* The write method was implemented, use that. */
 136       file->to_write (file, buf, strlen (buf));
 137     }
 138 }
 139
 140 static void
 141 null_file_delete (struct ui_file *file)
 142 {
 143   return;
 144 }
 145
 146 void *
 147 ui_file_data (struct ui_file *file)
 148 {
 149   if (file->magic != &ui_file_magic)
 150     internal_error (__FILE__, __LINE__,
 151                     "ui_file_data: bad magic number");
 152   return file->to_data;
 153 }
 154
 155 void
 156 gdb_flush (struct ui_file *file)
 157 {
 158   file->to_flush (file);
 159 }
 160
 161 int
 162 ui_file_isatty (struct ui_file *file)
 163 {
 164   return file->to_isatty (file);
 165 }
 166
 167 void
 168 ui_file_rewind (struct ui_file *file)
 169 {
 170   file->to_rewind (file);
 171 }
 172
 173 void
 174 ui_file_put (struct ui_file *file,
 175               ui_file_put_method_ftype *write,
 176               void *dest)
 177 {
 178   file->to_put (file, write, dest);
 179 }
 180
 181 void
 182 ui_file_write (struct ui_file *file,
 183                 const char *buf,
 184                 long length_buf)
 185 {
 186   file->to_write (file, buf, length_buf);
 187 }
 188
 189 void
 190 fputs_unfiltered (const char *buf, struct ui_file *file)
 191 {
 192   file->to_fputs (buf, file);
 193 }
 194
 195 void
 196 set_ui_file_flush (struct ui_file *file, ui_file_flush_ftype *flush)
 197 {
 198   file->to_flush = flush;
 199 }
 200
 201 void
 202 set_ui_file_isatty (struct ui_file *file, ui_file_isatty_ftype *isatty)
 203 {
 204   file->to_isatty = isatty;
 205 }
 206
 207 void
 208 set_ui_file_rewind (struct ui_file *file, ui_file_rewind_ftype *rewind)
 209 {
 210   file->to_rewind = rewind;
 211 }
 212
 213 void
 214 set_ui_file_put (struct ui_file *file, ui_file_put_ftype *put)
 215 {
 216   file->to_put = put;
 217 }
 218
 219 void
 220 set_ui_file_write (struct ui_file *file,
 221                     ui_file_write_ftype *write)
 222 {
 223   file->to_write = write;
 224 }
 225
 226 void
 227 set_ui_file_fputs (struct ui_file *file, ui_file_fputs_ftype *fputs)
 228 {
 229   file->to_fputs = fputs;
 230 }
 231
 232 void
 233 set_ui_file_data (struct ui_file *file, void *data,
 234                   ui_file_delete_ftype *delete)
 235 {
 236   file->to_data = data;
 237   file->to_delete = delete;
 238 }
 239
 240 /* ui_file utility function for converting a ``struct ui_file'' into
 241    a memory buffer''. */
 242
 243 struct accumulated_ui_file
 244 {
 245   char *buffer;
 246   long length;
 247 };
 248
 249 static void
 250 do_ui_file_xstrdup (void *context, const char *buffer, long length)
 251 {
 252   struct accumulated_ui_file *acc = context;
 253   if (acc->buffer == NULL)
 254     acc->buffer = xmalloc (length + 1);
 255   else
 256     acc->buffer = xrealloc (acc->buffer, acc->length + length + 1);
 257   memcpy (acc->buffer + acc->length, buffer, length);
 258   acc->length += length;
 259   acc->buffer[acc->length] = '\0';
 260 }
 261
 262 char *
 263 ui_file_xstrdup (struct ui_file *file,
 264                   long *length)
 265 {
 266   struct accumulated_ui_file acc;
 267   acc.buffer = NULL;
 268   acc.length = 0;
 269   ui_file_put (file, do_ui_file_xstrdup, &acc);
 270   if (acc.buffer == NULL)
 271     acc.buffer = xstrdup ("");
 272   *length = acc.length;
 273   return acc.buffer;
 274 }
 275 \f
 276 /* A pure memory based ``struct ui_file'' that can be used an output
 277    buffer. The buffers accumulated contents are available via
 278    ui_file_put(). */
 279
 280 struct mem_file
 281   {
 282     int *magic;
 283     char *buffer;
 284     int sizeof_buffer;
 285     int length_buffer;
 286   };
 287
 288 static ui_file_rewind_ftype mem_file_rewind;
 289 static ui_file_put_ftype mem_file_put;
 290 static ui_file_write_ftype mem_file_write;
 291 static ui_file_delete_ftype mem_file_delete;
 292 static struct ui_file *mem_file_new (void);
 293 static int mem_file_magic;
 294
 295 static struct ui_file *
 296 mem_file_new (void)
 297 {
 298   struct mem_file *stream = XMALLOC (struct mem_file);
 299   struct ui_file *file = ui_file_new ();
 300   set_ui_file_data (file, stream, mem_file_delete);
 301   set_ui_file_rewind (file, mem_file_rewind);
 302   set_ui_file_put (file, mem_file_put);
 303   set_ui_file_write (file, mem_file_write);
 304   stream->magic = &mem_file_magic;
 305   stream->buffer = NULL;
 306   stream->sizeof_buffer = 0;
 307   stream->length_buffer = 0;
 308   return file;
 309 }
 310
 311 static void
 312 mem_file_delete (struct ui_file *file)
 313 {
 314   struct mem_file *stream = ui_file_data (file);
 315   if (stream->magic != &mem_file_magic)
 316     internal_error (__FILE__, __LINE__,
 317                     "mem_file_delete: bad magic number");
 318   if (stream->buffer != NULL)
 319     xfree (stream->buffer);
 320   xfree (stream);
 321 }
 322
 323 struct ui_file *
 324 mem_fileopen (void)
 325 {
 326   return mem_file_new ();
 327 }
 328
 329 static void
 330 mem_file_rewind (struct ui_file *file)
 331 {
 332   struct mem_file *stream = ui_file_data (file);
 333   if (stream->magic != &mem_file_magic)
 334     internal_error (__FILE__, __LINE__,
 335                     "mem_file_rewind: bad magic number");
 336   stream->length_buffer = 0;
 337 }
 338
 339 static void
 340 mem_file_put (struct ui_file *file,
 341               ui_file_put_method_ftype *write,
 342               void *dest)
 343 {
 344   struct mem_file *stream = ui_file_data (file);
 345   if (stream->magic != &mem_file_magic)
 346     internal_error (__FILE__, __LINE__,
 347                     "mem_file_put: bad magic number");
 348   if (stream->length_buffer > 0)
 349     write (dest, stream->buffer, stream->length_buffer);
 350 }
 351
 352 void
 353 mem_file_write (struct ui_file *file,
 354                 const char *buffer,
 355                 long length_buffer)
 356 {
 357   struct mem_file *stream = ui_file_data (file);
 358   if (stream->magic != &mem_file_magic)
 359     internal_error (__FILE__, __LINE__,
 360                     "mem_file_write: bad magic number");
 361   if (stream->buffer == NULL)
 362     {
 363       stream->length_buffer = length_buffer;
 364       stream->sizeof_buffer = length_buffer;
 365       stream->buffer = xmalloc (stream->sizeof_buffer);
 366       memcpy (stream->buffer, buffer, length_buffer);
 367     }
 368   else
 369     {
 370       int new_length = stream->length_buffer + length_buffer;
 371       if (new_length >= stream->sizeof_buffer)
 372         {
 373           stream->sizeof_buffer = new_length;
 374           stream->buffer = xrealloc (stream->buffer, stream->sizeof_buffer);
 375         }
 376       memcpy (stream->buffer + stream->length_buffer, buffer, length_buffer);
 377       stream->length_buffer = new_length;
 378     }
 379 }
 380 \f
 381 /* ``struct ui_file'' implementation that maps directly onto
 382    <stdio.h>'s FILE. */
 383
 384 static ui_file_write_ftype stdio_file_write;
 385 static ui_file_fputs_ftype stdio_file_fputs;
 386 static ui_file_isatty_ftype stdio_file_isatty;
 387 static ui_file_delete_ftype stdio_file_delete;
 388 static struct ui_file *stdio_file_new (FILE * file, int close_p);
 389 static ui_file_flush_ftype stdio_file_flush;
 390
 391 static int stdio_file_magic;
 392
 393 struct stdio_file
 394   {
 395     int *magic;
 396     FILE *file;
 397     int close_p;
 398   };
 399
 400 static struct ui_file *
 401 stdio_file_new (FILE *file, int close_p)
 402 {
 403   struct ui_file *ui_file = ui_file_new ();
 404   struct stdio_file *stdio = xmalloc (sizeof (struct stdio_file));
 405   stdio->magic = &stdio_file_magic;
 406   stdio->file = file;
 407   stdio->close_p = close_p;
 408   set_ui_file_data (ui_file, stdio, stdio_file_delete);
 409   set_ui_file_flush (ui_file, stdio_file_flush);
 410   set_ui_file_write (ui_file, stdio_file_write);
 411   set_ui_file_fputs (ui_file, stdio_file_fputs);
 412   set_ui_file_isatty (ui_file, stdio_file_isatty);
 413   return ui_file;
 414 }
 415
 416 static void
 417 stdio_file_delete (struct ui_file *file)
 418 {
 419   struct stdio_file *stdio = ui_file_data (file);
 420   if (stdio->magic != &stdio_file_magic)
 421     internal_error (__FILE__, __LINE__,
 422                     "stdio_file_delete: bad magic number");
 423   if (stdio->close_p)
 424     {
 425       fclose (stdio->file);
 426     }
 427   xfree (stdio);
 428 }
 429
 430 static void
 431 stdio_file_flush (struct ui_file *file)
 432 {
 433   struct stdio_file *stdio = ui_file_data (file);
 434   if (stdio->magic != &stdio_file_magic)
 435     internal_error (__FILE__, __LINE__,
 436                     "stdio_file_flush: bad magic number");
 437   fflush (stdio->file);
 438 }
 439
 440 static void
 441 stdio_file_write (struct ui_file *file, const char *buf, long length_buf)
 442 {
 443   struct stdio_file *stdio = ui_file_data (file);
 444   if (stdio->magic != &stdio_file_magic)
 445     internal_error (__FILE__, __LINE__,
 446                     "stdio_file_write: bad magic number");
 447   fwrite (buf, length_buf, 1, stdio->file);
 448 }
 449
 450 static void
 451 stdio_file_fputs (const char *linebuffer, struct ui_file *file)
 452 {
 453   struct stdio_file *stdio = ui_file_data (file);
 454   if (stdio->magic != &stdio_file_magic)
 455     internal_error (__FILE__, __LINE__,
 456                     "stdio_file_fputs: bad magic number");
 457   fputs (linebuffer, stdio->file);
 458 }
 459
 460 static int
 461 stdio_file_isatty (struct ui_file *file)
 462 {
 463   struct stdio_file *stdio = ui_file_data (file);
 464   if (stdio->magic != &stdio_file_magic)
 465     internal_error (__FILE__, __LINE__,
 466                     "stdio_file_isatty: bad magic number");
 467   return (isatty (fileno (stdio->file)));
 468 }
 469
 470 /* Like fdopen().  Create a ui_file from a previously opened FILE. */
 471
 472 struct ui_file *
 473 stdio_fileopen (FILE *file)
 474 {
 475   return stdio_file_new (file, 0);
 476 }
 477
 478 struct ui_file *
 479 gdb_fopen (char *name, char *mode)
 480 {
 481   FILE *f = fopen (name, mode);
 482   if (f == NULL)
 483     return NULL;
 484   return stdio_file_new (f, 1);
 485 }
 486
 487 /* ``struct ui_file'' implementation that maps onto two ui-file objects.  */
 488
 489 static ui_file_write_ftype tee_file_write;
 490 static ui_file_fputs_ftype tee_file_fputs;
 491 static ui_file_isatty_ftype tee_file_isatty;
 492 static ui_file_delete_ftype tee_file_delete;
 493 static ui_file_flush_ftype tee_file_flush;
 494
 495 static int tee_file_magic;
 496
 497 struct tee_file
 498   {
 499     int *magic;
 500     struct ui_file *one, *two;
 501     int close_one, close_two;
 502   };
 503
 504 struct ui_file *
 505 tee_file_new (struct ui_file *one, int close_one,
 506               struct ui_file *two, int close_two)
 507 {
 508   struct ui_file *ui_file = ui_file_new ();
 509   struct tee_file *tee = xmalloc (sizeof (struct tee_file));
 510   tee->magic = &tee_file_magic;
 511   tee->one = one;
 512   tee->two = two;
 513   tee->close_one = close_one;
 514   tee->close_two = close_two;
 515   set_ui_file_data (ui_file, tee, tee_file_delete);
 516   set_ui_file_flush (ui_file, tee_file_flush);
 517   set_ui_file_write (ui_file, tee_file_write);
 518   set_ui_file_fputs (ui_file, tee_file_fputs);
 519   set_ui_file_isatty (ui_file, tee_file_isatty);
 520   return ui_file;
 521 }
 522
 523 static void
 524 tee_file_delete (struct ui_file *file)
 525 {
 526   struct tee_file *tee = ui_file_data (file);
 527   if (tee->magic != &tee_file_magic)
 528     internal_error (__FILE__, __LINE__,
 529                     "tee_file_delete: bad magic number");
 530   if (tee->close_one)
 531     ui_file_delete (tee->one);
 532   if (tee->close_two)
 533     ui_file_delete (tee->two);
 534
 535   xfree (tee);
 536 }
 537
 538 static void
 539 tee_file_flush (struct ui_file *file)
 540 {
 541   struct tee_file *tee = ui_file_data (file);
 542   if (tee->magic != &tee_file_magic)
 543     internal_error (__FILE__, __LINE__,
 544                     "tee_file_flush: bad magic number");
 545   tee->one->to_flush (tee->one);
 546   tee->two->to_flush (tee->two);
 547 }
 548
 549 static void
 550 tee_file_write (struct ui_file *file, const char *buf, long length_buf)
 551 {
 552   struct tee_file *tee = ui_file_data (file);
 553   if (tee->magic != &tee_file_magic)
 554     internal_error (__FILE__, __LINE__,
 555                     "tee_file_write: bad magic number");
 556   ui_file_write (tee->one, buf, length_buf);
 557   ui_file_write (tee->two, buf, length_buf);
 558 }
 559
 560 static void
 561 tee_file_fputs (const char *linebuffer, struct ui_file *file)
 562 {
 563   struct tee_file *tee = ui_file_data (file);
 564   if (tee->magic != &tee_file_magic)
 565     internal_error (__FILE__, __LINE__,
 566                     "tee_file_fputs: bad magic number");
 567   tee->one->to_fputs (linebuffer, tee->one);
 568   tee->two->to_fputs (linebuffer, tee->two);
 569 }
 570
 571 static int
 572 tee_file_isatty (struct ui_file *file)
 573 {
 574   struct tee_file *tee = ui_file_data (file);
 575   if (tee->magic != &tee_file_magic)
 576     internal_error (__FILE__, __LINE__,
 577                     "tee_file_isatty: bad magic number");
 578   return (0);
 579 }