gdb/ui-file.c

   1 /* UI_FILE - a generic STDIO like output stream.
   2    Copyright (C) 1999, 2000 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 /* Implement the ``struct ui_file'' object. */
  22
  23 #include "defs.h"
  24 #include "ui-file.h"
  25 #include "gdb_string.h"
  26
  27 #undef XMALLOC
  28 #define XMALLOC(TYPE) ((TYPE*) xmalloc (sizeof (TYPE)))
  29
  30 static ui_file_isatty_ftype null_file_isatty;
  31 static ui_file_write_ftype null_file_write;
  32 static ui_file_fputs_ftype null_file_fputs;
  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
  38 struct ui_file
  39   {
  40     int *magic;
  41     ui_file_flush_ftype *to_flush;
  42     ui_file_write_ftype *to_write;
  43     ui_file_fputs_ftype *to_fputs;
  44     ui_file_delete_ftype *to_delete;
  45     ui_file_isatty_ftype *to_isatty;
  46     ui_file_rewind_ftype *to_rewind;
  47     ui_file_put_ftype *to_put;
  48     void *to_data;
  49   };
  50 int ui_file_magic;
  51
  52 struct ui_file *
  53 ui_file_new ()
  54 {
  55   struct ui_file *file = xmalloc (sizeof (struct ui_file));
  56   file->magic = &ui_file_magic;
  57   set_ui_file_data (file, NULL, null_file_delete);
  58   set_ui_file_flush (file, null_file_flush);
  59   set_ui_file_write (file, null_file_write);
  60   set_ui_file_fputs (file, null_file_fputs);
  61   set_ui_file_isatty (file, null_file_isatty);
  62   set_ui_file_rewind (file, null_file_rewind);
  63   set_ui_file_put (file, null_file_put);
  64   return file;
  65 }
  66
  67 void
  68 ui_file_delete (file)
  69      struct ui_file *file;
  70 {
  71   file->to_delete (file);
  72   free (file);
  73 }
  74
  75 static int
  76 null_file_isatty (file)
  77      struct ui_file *file;
  78 {
  79   return 0;
  80 }
  81
  82 static void
  83 null_file_rewind (file)
  84      struct ui_file *file;
  85 {
  86   return;
  87 }
  88
  89 static void
  90 null_file_put (struct ui_file *file,
  91                ui_file_put_method_ftype *write,
  92                void *dest)
  93 {
  94   return;
  95 }
  96
  97 static void
  98 null_file_flush (file)
  99      struct ui_file *file;
 100 {
 101   return;
 102 }
 103
 104 static void
 105 null_file_write (struct ui_file *file,
 106                  const char *buf,
 107                  long sizeof_buf)
 108 {
 109   if (file->to_fputs == null_file_fputs)
 110     /* Both the write and fputs methods are null. Discard the
 111        request. */
 112     return;
 113   else
 114     {
 115       /* The fputs method isn't null, slowly pass the write request
 116          onto that.  FYI, this isn't as bad as it may look - the
 117          current (as of 1999-11-07) printf_* function calls fputc and
 118          fputc does exactly the below.  By having a write function it
 119          is possible to clean up that code.  */
 120       int i;
 121       char b[2];
 122       b[1] = '\0';
 123       for (i = 0; i < sizeof_buf; i++)
 124         {
 125           b[0] = buf[i];
 126           file->to_fputs (b, file);
 127         }
 128       return;
 129     }
 130 }
 131
 132 static void
 133 null_file_fputs (buf, file)
 134      const char *buf;
 135      struct ui_file *file;
 136 {
 137   if (file->to_write == null_file_write)
 138     /* Both the write and fputs methods are null. Discard the
 139        request. */
 140     return;
 141   else
 142     {
 143       /* The write method was implemented, use that. */
 144       file->to_write (file, buf, strlen (buf));
 145     }
 146 }
 147
 148 static void
 149 null_file_delete (file)
 150      struct ui_file *file;
 151 {
 152   return;
 153 }
 154
 155 void *
 156 ui_file_data (file)
 157      struct ui_file *file;
 158 {
 159   if (file->magic != &ui_file_magic)
 160     internal_error ("ui_file_data: bad magic number");
 161   return file->to_data;
 162 }
 163
 164 void
 165 gdb_flush (file)
 166      struct ui_file *file;
 167 {
 168   file->to_flush (file);
 169 }
 170
 171 int
 172 ui_file_isatty (file)
 173      struct ui_file *file;
 174 {
 175   return file->to_isatty (file);
 176 }
 177
 178 void
 179 ui_file_rewind (file)
 180      struct ui_file *file;
 181 {
 182   file->to_rewind (file);
 183 }
 184
 185 void
 186 ui_file_put (struct ui_file *file,
 187               ui_file_put_method_ftype *write,
 188               void *dest)
 189 {
 190   file->to_put (file, write, dest);
 191 }
 192
 193 void
 194 ui_file_write (struct ui_file *file,
 195                 const char *buf,
 196                 long length_buf)
 197 {
 198   file->to_write (file, buf, length_buf);
 199 }
 200
 201 void
 202 fputs_unfiltered (buf, file)
 203      const char *buf;
 204      struct ui_file *file;
 205 {
 206   file->to_fputs (buf, file);
 207 }
 208
 209 void
 210 set_ui_file_flush (file, flush)
 211      struct ui_file *file;
 212      ui_file_flush_ftype *flush;
 213 {
 214   file->to_flush = flush;
 215 }
 216
 217 void
 218 set_ui_file_isatty (file, isatty)
 219      struct ui_file *file;
 220      ui_file_isatty_ftype *isatty;
 221 {
 222   file->to_isatty = isatty;
 223 }
 224
 225 void
 226 set_ui_file_rewind (file, rewind)
 227      struct ui_file *file;
 228      ui_file_rewind_ftype *rewind;
 229 {
 230   file->to_rewind = rewind;
 231 }
 232
 233 void
 234 set_ui_file_put (file, put)
 235      struct ui_file *file;
 236      ui_file_put_ftype *put;
 237 {
 238   file->to_put = put;
 239 }
 240
 241 void
 242 set_ui_file_write (struct ui_file *file,
 243                     ui_file_write_ftype *write)
 244 {
 245   file->to_write = write;
 246 }
 247
 248 void
 249 set_ui_file_fputs (file, fputs)
 250      struct ui_file *file;
 251      ui_file_fputs_ftype *fputs;
 252 {
 253   file->to_fputs = fputs;
 254 }
 255
 256 void
 257 set_ui_file_data (file, data, delete)
 258      struct ui_file *file;
 259      void *data;
 260      ui_file_delete_ftype *delete;
 261 {
 262   file->to_data = data;
 263   file->to_delete = delete;
 264 }
 265
 266 /* ui_file utility function for converting a ``struct ui_file'' into
 267    a memory buffer''. */
 268
 269 struct accumulated_ui_file
 270 {
 271   char *buffer;
 272   long length;
 273 };
 274
 275 static void
 276 do_ui_file_xstrdup (void *context, const char *buffer, long length)
 277 {
 278   struct accumulated_ui_file *acc = context;
 279   if (acc->buffer == NULL)
 280     acc->buffer = xmalloc (length + 1);
 281   else
 282     acc->buffer = xrealloc (acc->buffer, acc->length + length + 1);
 283   memcpy (acc->buffer + acc->length, buffer, length);
 284   acc->length += length;
 285   acc->buffer[acc->length] = '\0';
 286 }
 287
 288 char *
 289 ui_file_xstrdup (struct ui_file *file,
 290                   long *length)
 291 {
 292   struct accumulated_ui_file acc;
 293   acc.buffer = NULL;
 294   acc.length = 0;
 295   ui_file_put (file, do_ui_file_xstrdup, &acc);
 296   if (acc.buffer == NULL)
 297     acc.buffer = xstrdup ("");
 298   *length = acc.length;
 299   return acc.buffer;
 300 }
 301 \f
 302 /* A pure memory based ``struct ui_file'' that can be used an output
 303    buffer. The buffers accumulated contents are available via
 304    ui_file_put(). */
 305
 306 struct mem_file
 307   {
 308     int *magic;
 309     char *buffer;
 310     int sizeof_buffer;
 311     int length_buffer;
 312   };
 313
 314 static ui_file_rewind_ftype mem_file_rewind;
 315 static ui_file_put_ftype mem_file_put;
 316 static ui_file_write_ftype mem_file_write;
 317 static ui_file_delete_ftype mem_file_delete;
 318 static struct ui_file *mem_file_new PARAMS ((void));
 319 static int mem_file_magic;
 320
 321 static struct ui_file *
 322 mem_file_new (void)
 323 {
 324   struct mem_file *stream = XMALLOC (struct mem_file);
 325   struct ui_file *file = ui_file_new ();
 326   set_ui_file_data (file, stream, mem_file_delete);
 327   set_ui_file_rewind (file, mem_file_rewind);
 328   set_ui_file_put (file, mem_file_put);
 329   set_ui_file_write (file, mem_file_write);
 330   stream->magic = &mem_file_magic;
 331   stream->buffer = NULL;
 332   stream->sizeof_buffer = 0;
 333   stream->length_buffer = 0;
 334   return file;
 335 }
 336
 337 static void
 338 mem_file_delete (struct ui_file *file)
 339 {
 340   struct mem_file *stream = ui_file_data (file);
 341   if (stream->magic != &mem_file_magic)
 342     internal_error ("mem_file_delete: bad magic number");
 343   if (stream->buffer != NULL)
 344     free (stream->buffer);
 345   free (stream);
 346 }
 347
 348 struct ui_file *
 349 mem_fileopen (void)
 350 {
 351   return mem_file_new ();
 352 }
 353
 354 static void
 355 mem_file_rewind (struct ui_file *file)
 356 {
 357   struct mem_file *stream = ui_file_data (file);
 358   if (stream->magic != &mem_file_magic)
 359     internal_error ("mem_file_rewind: bad magic number");
 360   stream->length_buffer = 0;
 361 }
 362
 363 static void
 364 mem_file_put (struct ui_file *file,
 365               ui_file_put_method_ftype *write,
 366               void *dest)
 367 {
 368   struct mem_file *stream = ui_file_data (file);
 369   if (stream->magic != &mem_file_magic)
 370     internal_error ("mem_file_put: bad magic number");
 371   if (stream->length_buffer > 0)
 372     write (dest, stream->buffer, stream->length_buffer);
 373 }
 374
 375 void
 376 mem_file_write (struct ui_file *file,
 377                 const char *buffer,
 378                 long length_buffer)
 379 {
 380   struct mem_file *stream = ui_file_data (file);
 381   if (stream->magic != &mem_file_magic)
 382     internal_error ("mem_file_write: bad magic number");
 383   if (stream->buffer == NULL)
 384     {
 385       stream->length_buffer = length_buffer;
 386       stream->sizeof_buffer = length_buffer;
 387       stream->buffer = xmalloc (stream->sizeof_buffer);
 388       memcpy (stream->buffer, buffer, length_buffer);
 389     }
 390   else
 391     {
 392       int new_length = stream->length_buffer + length_buffer;
 393       if (new_length >= stream->sizeof_buffer)
 394         {
 395           stream->sizeof_buffer = new_length;
 396           stream->buffer = xrealloc (stream->buffer, stream->sizeof_buffer);
 397         }
 398       memcpy (stream->buffer + stream->length_buffer, buffer, length_buffer);
 399       stream->length_buffer = new_length;
 400     }
 401 }
 402 \f
 403 /* ``struct ui_file'' implementation that maps directly onto
 404    <stdio.h>'s FILE. */
 405
 406 static ui_file_write_ftype stdio_file_write;
 407 static ui_file_fputs_ftype stdio_file_fputs;
 408 static ui_file_isatty_ftype stdio_file_isatty;
 409 static ui_file_delete_ftype stdio_file_delete;
 410 static struct ui_file *stdio_file_new PARAMS ((FILE * file, int close_p));
 411 static ui_file_flush_ftype stdio_file_flush;
 412
 413 static int stdio_file_magic;
 414
 415 struct stdio_file
 416   {
 417     int *magic;
 418     FILE *file;
 419     int close_p;
 420   };
 421
 422 static struct ui_file *
 423 stdio_file_new (file, close_p)
 424      FILE *file;
 425      int close_p;
 426 {
 427   struct ui_file *ui_file = ui_file_new ();
 428   struct stdio_file *stdio = xmalloc (sizeof (struct stdio_file));
 429   stdio->magic = &stdio_file_magic;
 430   stdio->file = file;
 431   stdio->close_p = close_p;
 432   set_ui_file_data (ui_file, stdio, stdio_file_delete);
 433   set_ui_file_flush (ui_file, stdio_file_flush);
 434   set_ui_file_write (ui_file, stdio_file_write);
 435   set_ui_file_fputs (ui_file, stdio_file_fputs);
 436   set_ui_file_isatty (ui_file, stdio_file_isatty);
 437   return ui_file;
 438 }
 439
 440 static void
 441 stdio_file_delete (file)
 442      struct ui_file *file;
 443 {
 444   struct stdio_file *stdio = ui_file_data (file);
 445   if (stdio->magic != &stdio_file_magic)
 446     internal_error ("stdio_file_delete: bad magic number");
 447   if (stdio->close_p)
 448     {
 449       fclose (stdio->file);
 450     }
 451   free (stdio);
 452 }
 453
 454 static void
 455 stdio_file_flush (file)
 456      struct ui_file *file;
 457 {
 458   struct stdio_file *stdio = ui_file_data (file);
 459   if (stdio->magic != &stdio_file_magic)
 460     internal_error ("stdio_file_flush: bad magic number");
 461   fflush (stdio->file);
 462 }
 463
 464 static void
 465 stdio_file_write (struct ui_file *file, const char *buf, long length_buf)
 466 {
 467   struct stdio_file *stdio = ui_file_data (file);
 468   if (stdio->magic != &stdio_file_magic)
 469     internal_error ("stdio_file_write: bad magic number");
 470   fwrite (buf, length_buf, 1, stdio->file);
 471 }
 472
 473 static void
 474 stdio_file_fputs (linebuffer, file)
 475      const char *linebuffer;
 476      struct ui_file *file;
 477 {
 478   struct stdio_file *stdio = ui_file_data (file);
 479   if (stdio->magic != &stdio_file_magic)
 480     internal_error ("stdio_file_fputs: bad magic number");
 481   fputs (linebuffer, stdio->file);
 482 }
 483
 484 static int
 485 stdio_file_isatty (file)
 486      struct ui_file *file;
 487 {
 488   struct stdio_file *stdio = ui_file_data (file);
 489   if (stdio->magic != &stdio_file_magic)
 490     internal_error ("stdio_file_isatty: bad magic number");
 491   return (isatty (fileno (stdio->file)));
 492 }
 493
 494 /* Like fdopen().  Create a ui_file from a previously opened FILE. */
 495
 496 struct ui_file *
 497 stdio_fileopen (file)
 498      FILE *file;
 499 {
 500   return stdio_file_new (file, 0);
 501 }
 502
 503 struct ui_file *
 504 gdb_fopen (name, mode)
 505      char *name;
 506      char *mode;
 507 {
 508   FILE *f = fopen (name, mode);
 509   if (f == NULL)
 510     return NULL;
 511   return stdio_file_new (f, 1);
 512 }