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 (void)
  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 (struct ui_file *file)
  69 {
  70   file->to_delete (file);
  71   free (file);
  72 }
  73
  74 static int
  75 null_file_isatty (struct ui_file *file)
  76 {
  77   return 0;
  78 }
  79
  80 static void
  81 null_file_rewind (struct ui_file *file)
  82 {
  83   return;
  84 }
  85
  86 static void
  87 null_file_put (struct ui_file *file,
  88                ui_file_put_method_ftype *write,
  89                void *dest)
  90 {
  91   return;
  92 }
  93
  94 static void
  95 null_file_flush (struct ui_file *file)
  96 {
  97   return;
  98 }
  99
 100 static void
 101 null_file_write (struct ui_file *file,
 102                  const char *buf,
 103                  long sizeof_buf)
 104 {
 105   if (file->to_fputs == null_file_fputs)
 106     /* Both the write and fputs methods are null. Discard the
 107        request. */
 108     return;
 109   else
 110     {
 111       /* The fputs method isn't null, slowly pass the write request
 112          onto that.  FYI, this isn't as bad as it may look - the
 113          current (as of 1999-11-07) printf_* function calls fputc and
 114          fputc does exactly the below.  By having a write function it
 115          is possible to clean up that code.  */
 116       int i;
 117       char b[2];
 118       b[1] = '\0';
 119       for (i = 0; i < sizeof_buf; i++)
 120         {
 121           b[0] = buf[i];
 122           file->to_fputs (b, file);
 123         }
 124       return;
 125     }
 126 }
 127
 128 static void
 129 null_file_fputs (const char *buf, struct ui_file *file)
 130 {
 131   if (file->to_write == null_file_write)
 132     /* Both the write and fputs methods are null. Discard the
 133        request. */
 134     return;
 135   else
 136     {
 137       /* The write method was implemented, use that. */
 138       file->to_write (file, buf, strlen (buf));
 139     }
 140 }
 141
 142 static void
 143 null_file_delete (struct ui_file *file)
 144 {
 145   return;
 146 }
 147
 148 void *
 149 ui_file_data (struct ui_file *file)
 150 {
 151   if (file->magic != &ui_file_magic)
 152     internal_error ("ui_file_data: bad magic number");
 153   return file->to_data;
 154 }
 155
 156 void
 157 gdb_flush (struct ui_file *file)
 158 {
 159   file->to_flush (file);
 160 }
 161
 162 int
 163 ui_file_isatty (struct ui_file *file)
 164 {
 165   return file->to_isatty (file);
 166 }
 167
 168 void
 169 ui_file_rewind (struct ui_file *file)
 170 {
 171   file->to_rewind (file);
 172 }
 173
 174 void
 175 ui_file_put (struct ui_file *file,
 176               ui_file_put_method_ftype *write,
 177               void *dest)
 178 {
 179   file->to_put (file, write, dest);
 180 }
 181
 182 void
 183 ui_file_write (struct ui_file *file,
 184                 const char *buf,
 185                 long length_buf)
 186 {
 187   file->to_write (file, buf, length_buf);
 188 }
 189
 190 void
 191 fputs_unfiltered (const char *buf, struct ui_file *file)
 192 {
 193   file->to_fputs (buf, file);
 194 }
 195
 196 void
 197 set_ui_file_flush (struct ui_file *file, ui_file_flush_ftype *flush)
 198 {
 199   file->to_flush = flush;
 200 }
 201
 202 void
 203 set_ui_file_isatty (struct ui_file *file, ui_file_isatty_ftype *isatty)
 204 {
 205   file->to_isatty = isatty;
 206 }
 207
 208 void
 209 set_ui_file_rewind (struct ui_file *file, ui_file_rewind_ftype *rewind)
 210 {
 211   file->to_rewind = rewind;
 212 }
 213
 214 void
 215 set_ui_file_put (struct ui_file *file, ui_file_put_ftype *put)
 216 {
 217   file->to_put = put;
 218 }
 219
 220 void
 221 set_ui_file_write (struct ui_file *file,
 222                     ui_file_write_ftype *write)
 223 {
 224   file->to_write = write;
 225 }
 226
 227 void
 228 set_ui_file_fputs (struct ui_file *file, ui_file_fputs_ftype *fputs)
 229 {
 230   file->to_fputs = fputs;
 231 }
 232
 233 void
 234 set_ui_file_data (struct ui_file *file, void *data,
 235                   ui_file_delete_ftype *delete)
 236 {
 237   file->to_data = data;
 238   file->to_delete = delete;
 239 }
 240
 241 /* ui_file utility function for converting a ``struct ui_file'' into
 242    a memory buffer''. */
 243
 244 struct accumulated_ui_file
 245 {
 246   char *buffer;
 247   long length;
 248 };
 249
 250 static void
 251 do_ui_file_xstrdup (void *context, const char *buffer, long length)
 252 {
 253   struct accumulated_ui_file *acc = context;
 254   if (acc->buffer == NULL)
 255     acc->buffer = xmalloc (length + 1);
 256   else
 257     acc->buffer = xrealloc (acc->buffer, acc->length + length + 1);
 258   memcpy (acc->buffer + acc->length, buffer, length);
 259   acc->length += length;
 260   acc->buffer[acc->length] = '\0';
 261 }
 262
 263 char *
 264 ui_file_xstrdup (struct ui_file *file,
 265                   long *length)
 266 {
 267   struct accumulated_ui_file acc;
 268   acc.buffer = NULL;
 269   acc.length = 0;
 270   ui_file_put (file, do_ui_file_xstrdup, &acc);
 271   if (acc.buffer == NULL)
 272     acc.buffer = xstrdup ("");
 273   *length = acc.length;
 274   return acc.buffer;
 275 }
 276 \f
 277 /* A pure memory based ``struct ui_file'' that can be used an output
 278    buffer. The buffers accumulated contents are available via
 279    ui_file_put(). */
 280
 281 struct mem_file
 282   {
 283     int *magic;
 284     char *buffer;
 285     int sizeof_buffer;
 286     int length_buffer;
 287   };
 288
 289 static ui_file_rewind_ftype mem_file_rewind;
 290 static ui_file_put_ftype mem_file_put;
 291 static ui_file_write_ftype mem_file_write;
 292 static ui_file_delete_ftype mem_file_delete;
 293 static struct ui_file *mem_file_new (void);
 294 static int mem_file_magic;
 295
 296 static struct ui_file *
 297 mem_file_new (void)
 298 {
 299   struct mem_file *stream = XMALLOC (struct mem_file);
 300   struct ui_file *file = ui_file_new ();
 301   set_ui_file_data (file, stream, mem_file_delete);
 302   set_ui_file_rewind (file, mem_file_rewind);
 303   set_ui_file_put (file, mem_file_put);
 304   set_ui_file_write (file, mem_file_write);
 305   stream->magic = &mem_file_magic;
 306   stream->buffer = NULL;
 307   stream->sizeof_buffer = 0;
 308   stream->length_buffer = 0;
 309   return file;
 310 }
 311
 312 static void
 313 mem_file_delete (struct ui_file *file)
 314 {
 315   struct mem_file *stream = ui_file_data (file);
 316   if (stream->magic != &mem_file_magic)
 317     internal_error ("mem_file_delete: bad magic number");
 318   if (stream->buffer != NULL)
 319     free (stream->buffer);
 320   free (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 ("mem_file_rewind: bad magic number");
 335   stream->length_buffer = 0;
 336 }
 337
 338 static void
 339 mem_file_put (struct ui_file *file,
 340               ui_file_put_method_ftype *write,
 341               void *dest)
 342 {
 343   struct mem_file *stream = ui_file_data (file);
 344   if (stream->magic != &mem_file_magic)
 345     internal_error ("mem_file_put: bad magic number");
 346   if (stream->length_buffer > 0)
 347     write (dest, stream->buffer, stream->length_buffer);
 348 }
 349
 350 void
 351 mem_file_write (struct ui_file *file,
 352                 const char *buffer,
 353                 long length_buffer)
 354 {
 355   struct mem_file *stream = ui_file_data (file);
 356   if (stream->magic != &mem_file_magic)
 357     internal_error ("mem_file_write: bad magic number");
 358   if (stream->buffer == NULL)
 359     {
 360       stream->length_buffer = length_buffer;
 361       stream->sizeof_buffer = length_buffer;
 362       stream->buffer = xmalloc (stream->sizeof_buffer);
 363       memcpy (stream->buffer, buffer, length_buffer);
 364     }
 365   else
 366     {
 367       int new_length = stream->length_buffer + length_buffer;
 368       if (new_length >= stream->sizeof_buffer)
 369         {
 370           stream->sizeof_buffer = new_length;
 371           stream->buffer = xrealloc (stream->buffer, stream->sizeof_buffer);
 372         }
 373       memcpy (stream->buffer + stream->length_buffer, buffer, length_buffer);
 374       stream->length_buffer = new_length;
 375     }
 376 }
 377 \f
 378 /* ``struct ui_file'' implementation that maps directly onto
 379    <stdio.h>'s FILE. */
 380
 381 static ui_file_write_ftype stdio_file_write;
 382 static ui_file_fputs_ftype stdio_file_fputs;
 383 static ui_file_isatty_ftype stdio_file_isatty;
 384 static ui_file_delete_ftype stdio_file_delete;
 385 static struct ui_file *stdio_file_new (FILE * file, int close_p);
 386 static ui_file_flush_ftype stdio_file_flush;
 387
 388 static int stdio_file_magic;
 389
 390 struct stdio_file
 391   {
 392     int *magic;
 393     FILE *file;
 394     int close_p;
 395   };
 396
 397 static struct ui_file *
 398 stdio_file_new (FILE *file, int close_p)
 399 {
 400   struct ui_file *ui_file = ui_file_new ();
 401   struct stdio_file *stdio = xmalloc (sizeof (struct stdio_file));
 402   stdio->magic = &stdio_file_magic;
 403   stdio->file = file;
 404   stdio->close_p = close_p;
 405   set_ui_file_data (ui_file, stdio, stdio_file_delete);
 406   set_ui_file_flush (ui_file, stdio_file_flush);
 407   set_ui_file_write (ui_file, stdio_file_write);
 408   set_ui_file_fputs (ui_file, stdio_file_fputs);
 409   set_ui_file_isatty (ui_file, stdio_file_isatty);
 410   return ui_file;
 411 }
 412
 413 static void
 414 stdio_file_delete (struct ui_file *file)
 415 {
 416   struct stdio_file *stdio = ui_file_data (file);
 417   if (stdio->magic != &stdio_file_magic)
 418     internal_error ("stdio_file_delete: bad magic number");
 419   if (stdio->close_p)
 420     {
 421       fclose (stdio->file);
 422     }
 423   free (stdio);
 424 }
 425
 426 static void
 427 stdio_file_flush (struct ui_file *file)
 428 {
 429   struct stdio_file *stdio = ui_file_data (file);
 430   if (stdio->magic != &stdio_file_magic)
 431     internal_error ("stdio_file_flush: bad magic number");
 432   fflush (stdio->file);
 433 }
 434
 435 static void
 436 stdio_file_write (struct ui_file *file, const char *buf, long length_buf)
 437 {
 438   struct stdio_file *stdio = ui_file_data (file);
 439   if (stdio->magic != &stdio_file_magic)
 440     internal_error ("stdio_file_write: bad magic number");
 441   fwrite (buf, length_buf, 1, stdio->file);
 442 }
 443
 444 static void
 445 stdio_file_fputs (const char *linebuffer, struct ui_file *file)
 446 {
 447   struct stdio_file *stdio = ui_file_data (file);
 448   if (stdio->magic != &stdio_file_magic)
 449     internal_error ("stdio_file_fputs: bad magic number");
 450   fputs (linebuffer, stdio->file);
 451 }
 452
 453 static int
 454 stdio_file_isatty (struct ui_file *file)
 455 {
 456   struct stdio_file *stdio = ui_file_data (file);
 457   if (stdio->magic != &stdio_file_magic)
 458     internal_error ("stdio_file_isatty: bad magic number");
 459   return (isatty (fileno (stdio->file)));
 460 }
 461
 462 /* Like fdopen().  Create a ui_file from a previously opened FILE. */
 463
 464 struct ui_file *
 465 stdio_fileopen (FILE *file)
 466 {
 467   return stdio_file_new (file, 0);
 468 }
 469
 470 struct ui_file *
 471 gdb_fopen (char *name, char *mode)
 472 {
 473   FILE *f = fopen (name, mode);
 474   if (f == NULL)
 475     return NULL;
 476   return stdio_file_new (f, 1);
 477 }