gdb/ui-out.c

   1 /* Output generating routines for GDB.
   2    Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
   3    Contributed by Cygnus Solutions.
   4    Written by Fernando Nasser for Cygnus.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #include "defs.h"
  24 #include "gdb_string.h"
  25 #include "expression.h"         /* For language.h */
  26 #include "language.h"
  27 #include "ui-out.h"
  28 #include "gdb_assert.h"
  29
  30 /* Convenience macro for allocting typesafe memory. */
  31
  32 #undef XMALLOC
  33 #define XMALLOC(TYPE) (TYPE*) xmalloc (sizeof (TYPE))
  34
  35 /* table header structures */
  36
  37 struct ui_out_hdr
  38   {
  39     int colno;
  40     int width;
  41     int alignment;
  42     char *col_name;
  43     char *colhdr;
  44     struct ui_out_hdr *next;
  45   };
  46
  47 /* Maintain a stack so that the info applicable to the inner most list
  48    is always available.  Stack/nested level 0 is reserved for the
  49    top-level result. */
  50
  51 enum { MAX_UI_OUT_LEVELS = 5 };
  52
  53 struct ui_out_level
  54   {
  55     /* Count each field; the first element is for non-list fields */
  56     int field_count;
  57     /* The type of this level. */
  58     enum ui_out_type type;
  59   };
  60
  61 /* Tables are special.  Maintain a separate structure that tracks
  62    their state.  At present an output can only contain a single table
  63    but that restriction might eventually be lifted.  */
  64
  65 struct ui_out_table
  66 {
  67   /* If on, a table is being generated.  */
  68   int flag;
  69
  70   /* If on, the body of a table is being generated.  If off, the table
  71      header is being generated.  */
  72   int body_flag;
  73
  74   /* Number of table columns (as specified in the table_begin call).  */
  75   int columns;
  76
  77   /* String identifying the table (as specified in the table_begin
  78      call).  */
  79   char *id;
  80
  81   /* Points to the first table header (if any).  */
  82   struct ui_out_hdr *header_first;
  83
  84   /* Points to the last table header (if any).  */
  85   struct ui_out_hdr *header_last;
  86
  87   /* Points to header of NEXT column to format.  */
  88   struct ui_out_hdr *header_next;
  89
  90 };
  91
  92
  93 /* The ui_out structure */
  94 /* Any change here requires a corresponding one in the initialization
  95    of the default uiout, which is statically initialized */
  96
  97 struct ui_out
  98   {
  99     int flags;
 100     /* specific implementation of ui-out */
 101     struct ui_out_impl *impl;
 102     struct ui_out_data *data;
 103
 104     /* Sub structure tracking the ui-out depth.  */
 105     int level;
 106     struct ui_out_level levels[MAX_UI_OUT_LEVELS];
 107
 108     /* A table, if any.  At present only a single table is supported.  */
 109     struct ui_out_table table;
 110   };
 111
 112 /* The current (inner most) level. */
 113 static struct ui_out_level *
 114 current_level (struct ui_out *uiout)
 115 {
 116   return &uiout->levels[uiout->level];
 117 }
 118
 119 /* Create a new level, of TYPE.  Return the new level's index. */
 120 static int
 121 push_level (struct ui_out *uiout,
 122             enum ui_out_type type,
 123             const char *id)
 124 {
 125   struct ui_out_level *current;
 126   /* We had better not overflow the buffer. */
 127   uiout->level++;
 128   gdb_assert (uiout->level >= 0 && uiout->level < MAX_UI_OUT_LEVELS);
 129   current = current_level (uiout);
 130   current->field_count = 0;
 131   current->type = type;
 132   return uiout->level;
 133 }
 134
 135 /* Discard the current level, return the discarded level's index.
 136    TYPE is the type of the level being discarded. */
 137 static int
 138 pop_level (struct ui_out *uiout,
 139            enum ui_out_type type)
 140 {
 141   /* We had better not underflow the buffer. */
 142   gdb_assert (uiout->level > 0 && uiout->level < MAX_UI_OUT_LEVELS);
 143   gdb_assert (current_level (uiout)->type == type);
 144   uiout->level--;
 145   return uiout->level + 1;
 146 }
 147
 148
 149 /* These are the default implementation functions */
 150
 151 static void default_table_begin (struct ui_out *uiout, int nbrofcols,
 152                                  int nr_rows, const char *tblid);
 153 static void default_table_body (struct ui_out *uiout);
 154 static void default_table_end (struct ui_out *uiout);
 155 static void default_table_header (struct ui_out *uiout, int width,
 156                                   enum ui_align alig, const char *col_name,
 157                                   const char *colhdr);
 158 static void default_begin (struct ui_out *uiout,
 159                            enum ui_out_type type,
 160                            int level, const char *id);
 161 static void default_end (struct ui_out *uiout,
 162                          enum ui_out_type type,
 163                          int level);
 164 static void default_field_int (struct ui_out *uiout, int fldno, int width,
 165                                enum ui_align alig,
 166                                const char *fldname,
 167                                int value);
 168 static void default_field_skip (struct ui_out *uiout, int fldno, int width,
 169                                 enum ui_align alig,
 170                                 const char *fldname);
 171 static void default_field_string (struct ui_out *uiout, int fldno, int width,
 172                                   enum ui_align align,
 173                                   const char *fldname,
 174                                   const char *string);
 175 static void default_field_fmt (struct ui_out *uiout, int fldno,
 176                                int width, enum ui_align align,
 177                                const char *fldname,
 178                                const char *format,
 179                                va_list args);
 180 static void default_spaces (struct ui_out *uiout, int numspaces);
 181 static void default_text (struct ui_out *uiout, const char *string);
 182 static void default_message (struct ui_out *uiout, int verbosity,
 183                              const char *format,
 184                              va_list args);
 185 static void default_wrap_hint (struct ui_out *uiout, char *identstring);
 186 static void default_flush (struct ui_out *uiout);
 187
 188 /* This is the default ui-out implementation functions vector */
 189
 190 struct ui_out_impl default_ui_out_impl =
 191 {
 192   default_table_begin,
 193   default_table_body,
 194   default_table_end,
 195   default_table_header,
 196   default_begin,
 197   default_end,
 198   default_field_int,
 199   default_field_skip,
 200   default_field_string,
 201   default_field_fmt,
 202   default_spaces,
 203   default_text,
 204   default_message,
 205   default_wrap_hint,
 206   default_flush,
 207   0, /* Does not need MI hacks.  */
 208 };
 209
 210 /* The default ui_out */
 211
 212 struct ui_out def_uiout =
 213 {
 214   0,                            /* flags */
 215   &default_ui_out_impl,         /* impl */
 216 };
 217
 218 /* Pointer to current ui_out */
 219 /* FIXME: This should not be a global, but something passed down from main.c
 220    or top.c */
 221
 222 struct ui_out *uiout = &def_uiout;
 223
 224 /* These are the interfaces to implementation functions */
 225
 226 static void uo_table_begin (struct ui_out *uiout, int nbrofcols,
 227                             int nr_rows, const char *tblid);
 228 static void uo_table_body (struct ui_out *uiout);
 229 static void uo_table_end (struct ui_out *uiout);
 230 static void uo_table_header (struct ui_out *uiout, int width,
 231                              enum ui_align align, const char *col_name,
 232                              const char *colhdr);
 233 static void uo_begin (struct ui_out *uiout,
 234                       enum ui_out_type type,
 235                       int level, const char *id);
 236 static void uo_end (struct ui_out *uiout,
 237                     enum ui_out_type type,
 238                     int level);
 239 static void uo_field_int (struct ui_out *uiout, int fldno, int width,
 240                           enum ui_align align, const char *fldname, int value);
 241 static void uo_field_skip (struct ui_out *uiout, int fldno, int width,
 242                            enum ui_align align, const char *fldname);
 243 static void uo_field_string (struct ui_out *uiout, int fldno, int width,
 244                              enum ui_align align, const char *fldname,
 245                              const char *string);
 246 static void uo_field_fmt (struct ui_out *uiout, int fldno, int width,
 247                           enum ui_align align, const char *fldname,
 248                           const char *format, va_list args);
 249 static void uo_spaces (struct ui_out *uiout, int numspaces);
 250 static void uo_text (struct ui_out *uiout, const char *string);
 251 static void uo_message (struct ui_out *uiout, int verbosity,
 252                         const char *format, va_list args);
 253 static void uo_wrap_hint (struct ui_out *uiout, char *identstring);
 254 static void uo_flush (struct ui_out *uiout);
 255
 256 /* Prototypes for local functions */
 257
 258 extern void _initialize_ui_out (void);
 259 static void append_header_to_list (struct ui_out *uiout, int width,
 260                                    int alignment, const char *col_name,
 261                                    const char *colhdr);
 262 static int get_next_header (struct ui_out *uiout, int *colno, int *width,
 263                             int *alignment, char **colhdr);
 264 static void clear_header_list (struct ui_out *uiout);
 265 static void verify_field_proper_position (struct ui_out *uiout);
 266 static void verify_field_alignment (struct ui_out *uiout, int fldno, int *width, int *alignment);
 267
 268 static void init_ui_out_state (struct ui_out *uiout);
 269
 270 /* exported functions (ui_out API) */
 271
 272 /* Mark beginning of a table */
 273
 274 void
 275 ui_out_table_begin (struct ui_out *uiout, int nbrofcols,
 276                     int nr_rows,
 277                     const char *tblid)
 278 {
 279   if (uiout->table.flag)
 280     internal_error (__FILE__, __LINE__,
 281                     "tables cannot be nested; table_begin found before \
 282 previous table_end.");
 283
 284   uiout->table.flag = 1;
 285   uiout->table.body_flag = 0;
 286   uiout->table.columns = nbrofcols;
 287   if (tblid != NULL)
 288     uiout->table.id = xstrdup (tblid);
 289   else
 290     uiout->table.id = NULL;
 291   clear_header_list (uiout);
 292
 293   uo_table_begin (uiout, nbrofcols, nr_rows, uiout->table.id);
 294 }
 295
 296 void
 297 ui_out_table_body (struct ui_out *uiout)
 298 {
 299   if (!uiout->table.flag)
 300     internal_error (__FILE__, __LINE__,
 301                     "table_body outside a table is not valid; it must be \
 302 after a table_begin and before a table_end.");
 303   if (uiout->table.body_flag)
 304     internal_error (__FILE__, __LINE__,
 305                     "extra table_body call not allowed; there must be \
 306 only one table_body after a table_begin and before a table_end.");
 307   if (uiout->table.header_next->colno != uiout->table.columns)
 308     internal_error (__FILE__, __LINE__,
 309                     "number of headers differ from number of table \
 310 columns.");
 311
 312   uiout->table.body_flag = 1;
 313   uiout->table.header_next = uiout->table.header_first;
 314
 315   uo_table_body (uiout);
 316 }
 317
 318 void
 319 ui_out_table_end (struct ui_out *uiout)
 320 {
 321   if (!uiout->table.flag)
 322     internal_error (__FILE__, __LINE__,
 323                     "misplaced table_end or missing table_begin.");
 324
 325   uiout->table.body_flag = 0;
 326   uiout->table.flag = 0;
 327
 328   uo_table_end (uiout);
 329
 330   if (uiout->table.id)
 331     xfree (uiout->table.id);
 332   clear_header_list (uiout);
 333 }
 334
 335 void
 336 ui_out_table_header (struct ui_out *uiout, int width, enum ui_align alignment,
 337                      const char *col_name,
 338                      const char *colhdr)
 339 {
 340   if (!uiout->table.flag || uiout->table.body_flag)
 341     internal_error (__FILE__, __LINE__,
 342                     "table header must be specified after table_begin \
 343 and before table_body.");
 344
 345   append_header_to_list (uiout, width, alignment, col_name, colhdr);
 346
 347   uo_table_header (uiout, width, alignment, col_name, colhdr);
 348 }
 349
 350 void
 351 ui_out_begin (struct ui_out *uiout,
 352               enum ui_out_type type,
 353               const char *id)
 354 {
 355   int new_level;
 356   if (uiout->table.flag && !uiout->table.body_flag)
 357     internal_error (__FILE__, __LINE__,
 358                     "table header or table_body expected; lists must be \
 359 specified after table_body.");
 360   new_level = push_level (uiout, type, id);
 361   if (uiout->table.flag && (new_level == 1))
 362     uiout->table.header_next = uiout->table.header_first;
 363   uo_begin (uiout, type, new_level, id);
 364 }
 365
 366 void
 367 ui_out_list_begin (struct ui_out *uiout,
 368                    const char *id)
 369 {
 370   ui_out_begin (uiout, ui_out_type_list, id);
 371 }
 372
 373 void
 374 ui_out_tuple_begin (struct ui_out *uiout, const char *id)
 375 {
 376   ui_out_begin (uiout, ui_out_type_tuple, id);
 377 }
 378
 379 void
 380 ui_out_end (struct ui_out *uiout,
 381             enum ui_out_type type)
 382 {
 383   int old_level = pop_level (uiout, type);
 384   uo_end (uiout, type, old_level);
 385 }
 386
 387 void
 388 ui_out_list_end (struct ui_out *uiout)
 389 {
 390   ui_out_end (uiout, ui_out_type_list);
 391 }
 392
 393 void
 394 ui_out_tuple_end (struct ui_out *uiout)
 395 {
 396   ui_out_end (uiout, ui_out_type_tuple);
 397 }
 398
 399 struct ui_out_end_cleanup_data
 400 {
 401   struct ui_out *uiout;
 402   enum ui_out_type type;
 403 };
 404
 405 static void
 406 do_cleanup_end (void *data)
 407 {
 408   struct ui_out_end_cleanup_data *end_cleanup_data = data;
 409   ui_out_end (end_cleanup_data->uiout, end_cleanup_data->type);
 410   xfree (end_cleanup_data);
 411 }
 412
 413 static struct cleanup *
 414 make_cleanup_ui_out_end (struct ui_out *uiout,
 415                          enum ui_out_type type)
 416 {
 417   struct ui_out_end_cleanup_data *end_cleanup_data;
 418   end_cleanup_data = XMALLOC (struct ui_out_end_cleanup_data);
 419   end_cleanup_data->uiout = uiout;
 420   end_cleanup_data->type = type;
 421   return make_cleanup (do_cleanup_end, end_cleanup_data);
 422 }
 423
 424 struct cleanup *
 425 make_cleanup_ui_out_begin_end (struct ui_out *uiout,
 426                                enum ui_out_type type,
 427                                const char *id)
 428 {
 429   ui_out_begin (uiout, type, id);
 430   return make_cleanup_ui_out_end (uiout, type);
 431 }
 432
 433 struct cleanup *
 434 make_cleanup_ui_out_tuple_begin_end (struct ui_out *uiout,
 435                                      const char *id)
 436 {
 437   ui_out_tuple_begin (uiout, id);
 438   return make_cleanup_ui_out_end (uiout, ui_out_type_tuple);
 439 }
 440
 441 struct cleanup *
 442 make_cleanup_ui_out_list_begin_end (struct ui_out *uiout,
 443                                     const char *id)
 444 {
 445   ui_out_list_begin (uiout, id);
 446   return make_cleanup_ui_out_end (uiout, ui_out_type_list);
 447 }
 448
 449 void
 450 ui_out_field_int (struct ui_out *uiout,
 451                   const char *fldname,
 452                   int value)
 453 {
 454   int fldno;
 455   int width;
 456   int align;
 457   struct ui_out_level *current = current_level (uiout);
 458
 459   verify_field_proper_position (uiout);
 460
 461   current->field_count += 1;
 462   fldno = current->field_count;
 463
 464   verify_field_alignment (uiout, fldno, &width, &align);
 465
 466   uo_field_int (uiout, fldno, width, align, fldname, value);
 467 }
 468
 469 void
 470 ui_out_field_core_addr (struct ui_out *uiout,
 471                         const char *fldname,
 472                         CORE_ADDR address)
 473 {
 474   char addstr[20];
 475
 476   /* FIXME-32x64: need a print_address_numeric with field width */
 477   /* print_address_numeric (address, 1, local_stream); */
 478   strcpy (addstr, local_hex_string_custom ((unsigned long) address, "08l"));
 479
 480   ui_out_field_string (uiout, fldname, addstr);
 481 }
 482
 483 void
 484 ui_out_field_stream (struct ui_out *uiout,
 485                      const char *fldname,
 486                      struct ui_stream *buf)
 487 {
 488   long length;
 489   char *buffer = ui_file_xstrdup (buf->stream, &length);
 490   struct cleanup *old_cleanup = make_cleanup (xfree, buffer);
 491   if (length > 0)
 492     ui_out_field_string (uiout, fldname, buffer);
 493   else
 494     ui_out_field_skip (uiout, fldname);
 495   ui_file_rewind (buf->stream);
 496   do_cleanups (old_cleanup);
 497 }
 498
 499 /* used to ommit a field */
 500
 501 void
 502 ui_out_field_skip (struct ui_out *uiout,
 503                    const char *fldname)
 504 {
 505   int fldno;
 506   int width;
 507   int align;
 508   struct ui_out_level *current = current_level (uiout);
 509
 510   verify_field_proper_position (uiout);
 511
 512   current->field_count += 1;
 513   fldno = current->field_count;
 514
 515   verify_field_alignment (uiout, fldno, &width, &align);
 516
 517   uo_field_skip (uiout, fldno, width, align, fldname);
 518 }
 519
 520 void
 521 ui_out_field_string (struct ui_out *uiout,
 522                      const char *fldname,
 523                      const char *string)
 524 {
 525   int fldno;
 526   int width;
 527   int align;
 528   struct ui_out_level *current = current_level (uiout);
 529
 530   verify_field_proper_position (uiout);
 531
 532   current->field_count += 1;
 533   fldno = current->field_count;
 534
 535   verify_field_alignment (uiout, fldno, &width, &align);
 536
 537   uo_field_string (uiout, fldno, width, align, fldname, string);
 538 }
 539
 540 /* VARARGS */
 541 void
 542 ui_out_field_fmt (struct ui_out *uiout,
 543                   const char *fldname,
 544                   const char *format, ...)
 545 {
 546   va_list args;
 547   int fldno;
 548   int width;
 549   int align;
 550   struct ui_out_level *current = current_level (uiout);
 551
 552   verify_field_proper_position (uiout);
 553
 554   current->field_count += 1;
 555   fldno = current->field_count;
 556
 557   /* will not align, but has to call anyway */
 558   verify_field_alignment (uiout, fldno, &width, &align);
 559
 560   va_start (args, format);
 561
 562   uo_field_fmt (uiout, fldno, width, align, fldname, format, args);
 563
 564   va_end (args);
 565 }
 566
 567 void
 568 ui_out_spaces (struct ui_out *uiout, int numspaces)
 569 {
 570   uo_spaces (uiout, numspaces);
 571 }
 572
 573 void
 574 ui_out_text (struct ui_out *uiout,
 575              const char *string)
 576 {
 577   uo_text (uiout, string);
 578 }
 579
 580 void
 581 ui_out_message (struct ui_out *uiout, int verbosity,
 582                 const char *format,...)
 583 {
 584   va_list args;
 585
 586   va_start (args, format);
 587
 588   uo_message (uiout, verbosity, format, args);
 589
 590   va_end (args);
 591 }
 592
 593 struct ui_stream *
 594 ui_out_stream_new (struct ui_out *uiout)
 595 {
 596   struct ui_stream *tempbuf;
 597
 598   tempbuf = XMALLOC (struct ui_stream);
 599   tempbuf->uiout = uiout;
 600   tempbuf->stream = mem_fileopen ();
 601   return tempbuf;
 602 }
 603
 604 void
 605 ui_out_stream_delete (struct ui_stream *buf)
 606 {
 607   ui_file_delete (buf->stream);
 608   xfree (buf);
 609 }
 610
 611 static void
 612 do_stream_delete (void *buf)
 613 {
 614   ui_out_stream_delete (buf);
 615 }
 616
 617 struct cleanup *
 618 make_cleanup_ui_out_stream_delete (struct ui_stream *buf)
 619 {
 620   return make_cleanup (do_stream_delete, buf);
 621 }
 622
 623
 624 void
 625 ui_out_wrap_hint (struct ui_out *uiout, char *identstring)
 626 {
 627   uo_wrap_hint (uiout, identstring);
 628 }
 629
 630 void
 631 ui_out_flush (struct ui_out *uiout)
 632 {
 633   uo_flush (uiout);
 634 }
 635
 636 /* set the flags specified by the mask given */
 637 int
 638 ui_out_set_flags (struct ui_out *uiout, int mask)
 639 {
 640   int oldflags = uiout->flags;
 641
 642   uiout->flags |= mask;
 643
 644   return oldflags;
 645 }
 646
 647 /* clear the flags specified by the mask given */
 648 int
 649 ui_out_clear_flags (struct ui_out *uiout, int mask)
 650 {
 651   int oldflags = uiout->flags;
 652
 653   uiout->flags &= ~mask;
 654
 655   return oldflags;
 656 }
 657
 658 /* test the flags against the mask given */
 659 int
 660 ui_out_test_flags (struct ui_out *uiout, int mask)
 661 {
 662   return (uiout->flags & mask);
 663 }
 664
 665 /* obtain the current verbosity level (as stablished by the
 666    'set verbositylevel' command */
 667
 668 int
 669 ui_out_get_verblvl (struct ui_out *uiout)
 670 {
 671   /* FIXME: not implemented yet */
 672   return 0;
 673 }
 674
 675 #if 0
 676 void
 677 ui_out_result_begin (struct ui_out *uiout, char *class)
 678 {
 679 }
 680
 681 void
 682 ui_out_result_end (struct ui_out *uiout)
 683 {
 684 }
 685
 686 void
 687 ui_out_info_begin (struct ui_out *uiout, char *class)
 688 {
 689 }
 690
 691 void
 692 ui_out_info_end (struct ui_out *uiout)
 693 {
 694 }
 695
 696 void
 697 ui_out_notify_begin (struct ui_out *uiout, char *class)
 698 {
 699 }
 700
 701 void
 702 ui_out_notify_end (struct ui_out *uiout)
 703 {
 704 }
 705
 706 void
 707 ui_out_error_begin (struct ui_out *uiout, char *class)
 708 {
 709 }
 710
 711 void
 712 ui_out_error_end (struct ui_out *uiout)
 713 {
 714 }
 715 #endif
 716
 717 #if 0
 718 void
 719 gdb_error (ui_out * uiout, int severity, char *format,...)
 720 {
 721   va_list args;
 722 }
 723
 724 void
 725 gdb_query (struct ui_out *uiout, int qflags, char *qprompt)
 726 {
 727 }
 728 #endif
 729
 730 int
 731 ui_out_is_mi_like_p (struct ui_out *uiout)
 732 {
 733   return uiout->impl->is_mi_like_p;
 734 }
 735
 736 /* default gdb-out hook functions */
 737
 738 static void
 739 default_table_begin (struct ui_out *uiout, int nbrofcols,
 740                      int nr_rows,
 741                      const char *tblid)
 742 {
 743 }
 744
 745 static void
 746 default_table_body (struct ui_out *uiout)
 747 {
 748 }
 749
 750 static void
 751 default_table_end (struct ui_out *uiout)
 752 {
 753 }
 754
 755 static void
 756 default_table_header (struct ui_out *uiout, int width, enum ui_align alignment,
 757                       const char *col_name,
 758                       const char *colhdr)
 759 {
 760 }
 761
 762 static void
 763 default_begin (struct ui_out *uiout,
 764                enum ui_out_type type,
 765                int level,
 766                const char *id)
 767 {
 768 }
 769
 770 static void
 771 default_end (struct ui_out *uiout,
 772              enum ui_out_type type,
 773              int level)
 774 {
 775 }
 776
 777 static void
 778 default_field_int (struct ui_out *uiout, int fldno, int width,
 779                    enum ui_align align,
 780                    const char *fldname, int value)
 781 {
 782 }
 783
 784 static void
 785 default_field_skip (struct ui_out *uiout, int fldno, int width,
 786                     enum ui_align align, const char *fldname)
 787 {
 788 }
 789
 790 static void
 791 default_field_string (struct ui_out *uiout,
 792                       int fldno,
 793                       int width,
 794                       enum ui_align align,
 795                       const char *fldname,
 796                       const char *string)
 797 {
 798 }
 799
 800 static void
 801 default_field_fmt (struct ui_out *uiout, int fldno, int width,
 802                    enum ui_align align,
 803                    const char *fldname,
 804                    const char *format,
 805                    va_list args)
 806 {
 807 }
 808
 809 static void
 810 default_spaces (struct ui_out *uiout, int numspaces)
 811 {
 812 }
 813
 814 static void
 815 default_text (struct ui_out *uiout, const char *string)
 816 {
 817 }
 818
 819 static void
 820 default_message (struct ui_out *uiout, int verbosity,
 821                  const char *format,
 822                  va_list args)
 823 {
 824 }
 825
 826 static void
 827 default_wrap_hint (struct ui_out *uiout, char *identstring)
 828 {
 829 }
 830
 831 static void
 832 default_flush (struct ui_out *uiout)
 833 {
 834 }
 835
 836 /* Interface to the implementation functions */
 837
 838 void
 839 uo_table_begin (struct ui_out *uiout, int nbrofcols,
 840                 int nr_rows,
 841                 const char *tblid)
 842 {
 843   if (!uiout->impl->table_begin)
 844     return;
 845   uiout->impl->table_begin (uiout, nbrofcols, nr_rows, tblid);
 846 }
 847
 848 void
 849 uo_table_body (struct ui_out *uiout)
 850 {
 851   if (!uiout->impl->table_body)
 852     return;
 853   uiout->impl->table_body (uiout);
 854 }
 855
 856 void
 857 uo_table_end (struct ui_out *uiout)
 858 {
 859   if (!uiout->impl->table_end)
 860     return;
 861   uiout->impl->table_end (uiout);
 862 }
 863
 864 void
 865 uo_table_header (struct ui_out *uiout, int width, enum ui_align align,
 866                  const char *col_name,
 867                  const char *colhdr)
 868 {
 869   if (!uiout->impl->table_header)
 870     return;
 871   uiout->impl->table_header (uiout, width, align, col_name, colhdr);
 872 }
 873
 874 void
 875 uo_begin (struct ui_out *uiout,
 876           enum ui_out_type type,
 877           int level,
 878           const char *id)
 879 {
 880   if (uiout->impl->begin == NULL)
 881     return;
 882   uiout->impl->begin (uiout, type, level, id);
 883 }
 884
 885 void
 886 uo_end (struct ui_out *uiout,
 887         enum ui_out_type type,
 888         int level)
 889 {
 890   if (uiout->impl->end == NULL)
 891     return;
 892   uiout->impl->end (uiout, type, level);
 893 }
 894
 895 void
 896 uo_field_int (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 897               const char *fldname,
 898               int value)
 899 {
 900   if (!uiout->impl->field_int)
 901     return;
 902   uiout->impl->field_int (uiout, fldno, width, align, fldname, value);
 903 }
 904
 905 void
 906 uo_field_skip (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 907                const char *fldname)
 908 {
 909   if (!uiout->impl->field_skip)
 910     return;
 911   uiout->impl->field_skip (uiout, fldno, width, align, fldname);
 912 }
 913
 914 void
 915 uo_field_string (struct ui_out *uiout, int fldno, int width,
 916                  enum ui_align align,
 917                  const char *fldname,
 918                  const char *string)
 919 {
 920   if (!uiout->impl->field_string)
 921     return;
 922   uiout->impl->field_string (uiout, fldno, width, align, fldname, string);
 923 }
 924
 925 void
 926 uo_field_fmt (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 927               const char *fldname,
 928               const char *format,
 929               va_list args)
 930 {
 931   if (!uiout->impl->field_fmt)
 932     return;
 933   uiout->impl->field_fmt (uiout, fldno, width, align, fldname, format, args);
 934 }
 935
 936 void
 937 uo_spaces (struct ui_out *uiout, int numspaces)
 938 {
 939   if (!uiout->impl->spaces)
 940     return;
 941   uiout->impl->spaces (uiout, numspaces);
 942 }
 943
 944 void
 945 uo_text (struct ui_out *uiout,
 946          const char *string)
 947 {
 948   if (!uiout->impl->text)
 949     return;
 950   uiout->impl->text (uiout, string);
 951 }
 952
 953 void
 954 uo_message (struct ui_out *uiout, int verbosity,
 955             const char *format,
 956             va_list args)
 957 {
 958   if (!uiout->impl->message)
 959     return;
 960   uiout->impl->message (uiout, verbosity, format, args);
 961 }
 962
 963 void
 964 uo_wrap_hint (struct ui_out *uiout, char *identstring)
 965 {
 966   if (!uiout->impl->wrap_hint)
 967     return;
 968   uiout->impl->wrap_hint (uiout, identstring);
 969 }
 970
 971 void
 972 uo_flush (struct ui_out *uiout)
 973 {
 974   if (!uiout->impl->flush)
 975     return;
 976   uiout->impl->flush (uiout);
 977 }
 978
 979 /* local functions */
 980
 981 /* list of column headers manipulation routines */
 982
 983 static void
 984 clear_header_list (struct ui_out *uiout)
 985 {
 986   while (uiout->table.header_first != NULL)
 987     {
 988       uiout->table.header_next = uiout->table.header_first;
 989       uiout->table.header_first = uiout->table.header_first->next;
 990       if (uiout->table.header_next->colhdr != NULL)
 991         xfree (uiout->table.header_next->colhdr);
 992       xfree (uiout->table.header_next);
 993     }
 994   gdb_assert (uiout->table.header_first == NULL);
 995   uiout->table.header_last = NULL;
 996   uiout->table.header_next = NULL;
 997 }
 998
 999 static void
1000 append_header_to_list (struct ui_out *uiout,
1001                        int width,
1002                        int alignment,
1003                        const char *col_name,
1004                        const char *colhdr)
1005 {
1006   struct ui_out_hdr *temphdr;
1007
1008   temphdr = XMALLOC (struct ui_out_hdr);
1009   temphdr->width = width;
1010   temphdr->alignment = alignment;
1011   /* we have to copy the column title as the original may be an automatic */
1012   if (colhdr != NULL)
1013     temphdr->colhdr = xstrdup (colhdr);
1014   else
1015     temphdr->colhdr = NULL;
1016   if (col_name != NULL)
1017     temphdr->col_name = xstrdup (colhdr);
1018   else
1019     temphdr->col_name = xstrdup (colhdr);
1020   temphdr->next = NULL;
1021   if (uiout->table.header_first == NULL)
1022     {
1023       temphdr->colno = 1;
1024       uiout->table.header_first = temphdr;
1025       uiout->table.header_last = temphdr;
1026     }
1027   else
1028     {
1029       temphdr->colno = uiout->table.header_last->colno + 1;
1030       uiout->table.header_last->next = temphdr;
1031       uiout->table.header_last = temphdr;
1032     }
1033   uiout->table.header_next = uiout->table.header_last;
1034 }
1035
1036 /* Extract the format information for the NEXT header and and advance
1037    the header pointer.  Return 0 if there was no next header.  */
1038
1039 static int
1040 get_next_header (struct ui_out *uiout,
1041                  int *colno,
1042                  int *width,
1043                  int *alignment,
1044                  char **colhdr)
1045 {
1046   /* There may be no headers at all or we may have used all columns.  */
1047   if (uiout->table.header_next == NULL)
1048     return 0;
1049   *colno = uiout->table.header_next->colno;
1050   *width = uiout->table.header_next->width;
1051   *alignment = uiout->table.header_next->alignment;
1052   *colhdr = uiout->table.header_next->colhdr;
1053   /* Advance the header pointer to the next entry.  */
1054   uiout->table.header_next = uiout->table.header_next->next;
1055   return 1;
1056 }
1057
1058 /* makes sure the field_* calls were properly placed */
1059
1060 static void
1061 verify_field_proper_position (struct ui_out *uiout)
1062 {
1063   if (uiout->table.flag)
1064     {
1065       if (!uiout->table.body_flag)
1066         internal_error (__FILE__, __LINE__,
1067                         "table_body missing; table fields must be \
1068 specified after table_body and inside a list.");
1069       if (uiout->level == 0)
1070         internal_error (__FILE__, __LINE__,
1071                         "list_begin missing; table fields must be \
1072 specified after table_body and inside a list.");
1073     }
1074 }
1075
1076 /* determines what is the alignment policy */
1077
1078 static void
1079 verify_field_alignment (struct ui_out *uiout,
1080                         int fldno,
1081                         int *width,
1082                         int *align)
1083 {
1084   int colno;
1085   char *text;
1086
1087   if (uiout->table.flag
1088       && get_next_header (uiout, &colno, width, align, &text))
1089     {
1090       if (fldno != colno)
1091         internal_error (__FILE__, __LINE__,
1092                         "ui-out internal error in handling headers.");
1093     }
1094   else
1095     {
1096       *width = 0;
1097       *align = ui_noalign;
1098     }
1099 }
1100
1101 /* access to ui_out format private members */
1102
1103 void
1104 ui_out_get_field_separator (struct ui_out *uiout)
1105 {
1106 }
1107
1108 /* Access to ui-out members data */
1109
1110 struct ui_out_data *
1111 ui_out_data (struct ui_out *uiout)
1112 {
1113   return uiout->data;
1114 }
1115
1116 /* initalize private members at startup */
1117
1118 struct ui_out *
1119 ui_out_new (struct ui_out_impl *impl,
1120             struct ui_out_data *data,
1121             int flags)
1122 {
1123   struct ui_out *uiout = XMALLOC (struct ui_out);
1124   uiout->data = data;
1125   uiout->impl = impl;
1126   uiout->flags = flags;
1127   uiout->table.flag = 0;
1128   uiout->table.body_flag = 0;
1129   uiout->level = 0;
1130   memset (uiout->levels, 0, sizeof (uiout->levels));
1131   uiout->table.header_first = NULL;
1132   uiout->table.header_last = NULL;
1133   uiout->table.header_next = NULL;
1134   return uiout;
1135 }
1136
1137 /* standard gdb initialization hook */
1138
1139 void
1140 _initialize_ui_out (void)
1141 {
1142   /* nothing needs to be done */
1143 }