gdb/ui-out.c

   1 /* Output generating routines for GDB.
   2
   3    Copyright (C) 1999-2016 Free Software Foundation, Inc.
   4
   5    Contributed by Cygnus Solutions.
   6    Written by Fernando Nasser for Cygnus.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include "defs.h"
  24 #include "expression.h"         /* For language.h */
  25 #include "language.h"
  26 #include "ui-out.h"
  27
  28 /* table header structures */
  29
  30 struct ui_out_hdr
  31   {
  32     int colno;
  33     int width;
  34     enum ui_align alignment;
  35     char *col_name;
  36     char *colhdr;
  37     struct ui_out_hdr *next;
  38   };
  39
  40 struct ui_out_level
  41   {
  42     /* Count each field; the first element is for non-list fields.  */
  43     int field_count;
  44     /* The type of this level.  */
  45     enum ui_out_type type;
  46   };
  47
  48 /* Define uiout->level vector types and operations.  */
  49 typedef struct ui_out_level *ui_out_level_p;
  50 DEF_VEC_P (ui_out_level_p);
  51
  52 /* Tables are special.  Maintain a separate structure that tracks
  53    their state.  At present an output can only contain a single table
  54    but that restriction might eventually be lifted.  */
  55
  56 struct ui_out_table
  57 {
  58   /* If on, a table is being generated.  */
  59   int flag;
  60
  61   /* If on, the body of a table is being generated.  If off, the table
  62      header is being generated.  */
  63   int body_flag;
  64
  65   /* The level at which each entry of the table is to be found.  A row
  66      (a tuple) is made up of entries.  Consequently ENTRY_LEVEL is one
  67      above that of the table.  */
  68   int entry_level;
  69
  70   /* Number of table columns (as specified in the table_begin call).  */
  71   int columns;
  72
  73   /* String identifying the table (as specified in the table_begin
  74      call).  */
  75   char *id;
  76
  77   /* Points to the first table header (if any).  */
  78   struct ui_out_hdr *header_first;
  79
  80   /* Points to the last table header (if any).  */
  81   struct ui_out_hdr *header_last;
  82
  83   /* Points to header of NEXT column to format.  */
  84   struct ui_out_hdr *header_next;
  85
  86 };
  87
  88
  89 /* The ui_out structure */
  90 /* Any change here requires a corresponding one in the initialization
  91    of the default uiout, which is statically initialized.  */
  92
  93 struct ui_out
  94   {
  95     int flags;
  96     /* Specific implementation of ui-out.  */
  97     const struct ui_out_impl *impl;
  98     void *data;
  99
 100     /* Current level.  */
 101     int level;
 102
 103     /* Vector to store and track the ui-out levels.  */
 104     VEC (ui_out_level_p) *levels;
 105
 106     /* A table, if any.  At present only a single table is supported.  */
 107     struct ui_out_table table;
 108   };
 109
 110 /* The current (inner most) level.  */
 111 static struct ui_out_level *
 112 current_level (struct ui_out *uiout)
 113 {
 114   return VEC_index (ui_out_level_p, uiout->levels, uiout->level);
 115 }
 116
 117 /* Create a new level, of TYPE.  Return the new level's index.  */
 118 static int
 119 push_level (struct ui_out *uiout,
 120             enum ui_out_type type,
 121             const char *id)
 122 {
 123   struct ui_out_level *current;
 124
 125   uiout->level++;
 126   current = XNEW (struct ui_out_level);
 127   current->field_count = 0;
 128   current->type = type;
 129   VEC_safe_push (ui_out_level_p, uiout->levels, current);
 130   return uiout->level;
 131 }
 132
 133 /* Discard the current level, return the discarded level's index.
 134    TYPE is the type of the level being discarded.  */
 135 static int
 136 pop_level (struct ui_out *uiout,
 137            enum ui_out_type type)
 138 {
 139   struct ui_out_level *current;
 140
 141   /* We had better not underflow the buffer.  */
 142   gdb_assert (uiout->level > 0);
 143   gdb_assert (current_level (uiout)->type == type);
 144   current = VEC_pop (ui_out_level_p, uiout->levels);
 145   xfree (current);
 146   uiout->level--;
 147   return uiout->level + 1;
 148 }
 149
 150 /* These are the interfaces to implementation functions.  */
 151
 152 static void uo_table_begin (struct ui_out *uiout, int nbrofcols,
 153                             int nr_rows, const char *tblid);
 154 static void uo_table_body (struct ui_out *uiout);
 155 static void uo_table_end (struct ui_out *uiout);
 156 static void uo_table_header (struct ui_out *uiout, int width,
 157                              enum ui_align align, const char *col_name,
 158                              const char *colhdr);
 159 static void uo_begin (struct ui_out *uiout,
 160                       enum ui_out_type type,
 161                       int level, const char *id);
 162 static void uo_end (struct ui_out *uiout,
 163                     enum ui_out_type type,
 164                     int level);
 165 static void uo_field_int (struct ui_out *uiout, int fldno, int width,
 166                           enum ui_align align, const char *fldname, int value);
 167 static void uo_field_skip (struct ui_out *uiout, int fldno, int width,
 168                            enum ui_align align, const char *fldname);
 169 static void uo_field_fmt (struct ui_out *uiout, int fldno, int width,
 170                           enum ui_align align, const char *fldname,
 171                           const char *format, va_list args)
 172      ATTRIBUTE_PRINTF (6, 0);
 173 static void uo_spaces (struct ui_out *uiout, int numspaces);
 174 static void uo_text (struct ui_out *uiout, const char *string);
 175 static void uo_message (struct ui_out *uiout, int verbosity,
 176                         const char *format, va_list args)
 177      ATTRIBUTE_PRINTF (3, 0);
 178 static void uo_wrap_hint (struct ui_out *uiout, char *identstring);
 179 static void uo_flush (struct ui_out *uiout);
 180 static int uo_redirect (struct ui_out *uiout, struct ui_file *outstream);
 181 static void uo_data_destroy (struct ui_out *uiout);
 182
 183 /* Prototypes for local functions */
 184
 185 extern void _initialize_ui_out (void);
 186 static void append_header_to_list (struct ui_out *uiout, int width,
 187                                    enum ui_align alignment, const char *col_name,
 188                                    const char *colhdr);
 189 static int get_next_header (struct ui_out *uiout, int *colno, int *width,
 190                             enum ui_align *alignment, char **colhdr);
 191 static void clear_header_list (struct ui_out *uiout);
 192 static void clear_table (struct ui_out *uiout);
 193 static void verify_field (struct ui_out *uiout, int *fldno, int *width,
 194                           enum ui_align *align);
 195
 196 /* exported functions (ui_out API) */
 197
 198 /* Mark beginning of a table.  */
 199
 200 static void
 201 ui_out_table_begin (struct ui_out *uiout, int nbrofcols,
 202                     int nr_rows,
 203                     const char *tblid)
 204 {
 205   if (uiout->table.flag)
 206     internal_error (__FILE__, __LINE__,
 207                     _("tables cannot be nested; table_begin found before \
 208 previous table_end."));
 209
 210   uiout->table.flag = 1;
 211   uiout->table.body_flag = 0;
 212   uiout->table.entry_level = uiout->level + 1;
 213   uiout->table.columns = nbrofcols;
 214   if (tblid != NULL)
 215     uiout->table.id = xstrdup (tblid);
 216   else
 217     uiout->table.id = NULL;
 218   clear_header_list (uiout);
 219
 220   uo_table_begin (uiout, nbrofcols, nr_rows, uiout->table.id);
 221 }
 222
 223 void
 224 ui_out_table_body (struct ui_out *uiout)
 225 {
 226   if (!uiout->table.flag)
 227     internal_error (__FILE__, __LINE__,
 228                     _("table_body outside a table is not valid; it must be \
 229 after a table_begin and before a table_end."));
 230   if (uiout->table.body_flag)
 231     internal_error (__FILE__, __LINE__,
 232                     _("extra table_body call not allowed; there must be \
 233 only one table_body after a table_begin and before a table_end."));
 234   if (uiout->table.header_next->colno != uiout->table.columns)
 235     internal_error (__FILE__, __LINE__,
 236                     _("number of headers differ from number of table \
 237 columns."));
 238
 239   uiout->table.body_flag = 1;
 240   uiout->table.header_next = uiout->table.header_first;
 241
 242   uo_table_body (uiout);
 243 }
 244
 245 static void
 246 ui_out_table_end (struct ui_out *uiout)
 247 {
 248   if (!uiout->table.flag)
 249     internal_error (__FILE__, __LINE__,
 250                     _("misplaced table_end or missing table_begin."));
 251
 252   uiout->table.entry_level = 0;
 253   uiout->table.body_flag = 0;
 254   uiout->table.flag = 0;
 255
 256   uo_table_end (uiout);
 257   clear_table (uiout);
 258 }
 259
 260 void
 261 ui_out_table_header (struct ui_out *uiout, int width, enum ui_align alignment,
 262                      const char *col_name,
 263                      const char *colhdr)
 264 {
 265   if (!uiout->table.flag || uiout->table.body_flag)
 266     internal_error (__FILE__, __LINE__,
 267                     _("table header must be specified after table_begin \
 268 and before table_body."));
 269
 270   append_header_to_list (uiout, width, alignment, col_name, colhdr);
 271
 272   uo_table_header (uiout, width, alignment, col_name, colhdr);
 273 }
 274
 275 static void
 276 do_cleanup_table_end (void *data)
 277 {
 278   struct ui_out *ui_out = (struct ui_out *) data;
 279
 280   ui_out_table_end (ui_out);
 281 }
 282
 283 struct cleanup *
 284 make_cleanup_ui_out_table_begin_end (struct ui_out *ui_out, int nr_cols,
 285                                      int nr_rows, const char *tblid)
 286 {
 287   ui_out_table_begin (ui_out, nr_cols, nr_rows, tblid);
 288   return make_cleanup (do_cleanup_table_end, ui_out);
 289 }
 290
 291 void
 292 ui_out_begin (struct ui_out *uiout,
 293               enum ui_out_type type,
 294               const char *id)
 295 {
 296   int new_level;
 297
 298   if (uiout->table.flag && !uiout->table.body_flag)
 299     internal_error (__FILE__, __LINE__,
 300                     _("table header or table_body expected; lists must be \
 301 specified after table_body."));
 302
 303   /* Be careful to verify the ``field'' before the new tuple/list is
 304      pushed onto the stack.  That way the containing list/table/row is
 305      verified and not the newly created tuple/list.  This verification
 306      is needed (at least) for the case where a table row entry
 307      contains either a tuple/list.  For that case bookkeeping such as
 308      updating the column count or advancing to the next heading still
 309      needs to be performed.  */
 310   {
 311     int fldno;
 312     int width;
 313     enum ui_align align;
 314
 315     verify_field (uiout, &fldno, &width, &align);
 316   }
 317
 318   new_level = push_level (uiout, type, id);
 319
 320   /* If the push puts us at the same level as a table row entry, we've
 321      got a new table row.  Put the header pointer back to the start.  */
 322   if (uiout->table.body_flag
 323       && uiout->table.entry_level == new_level)
 324     uiout->table.header_next = uiout->table.header_first;
 325
 326   uo_begin (uiout, type, new_level, id);
 327 }
 328
 329 void
 330 ui_out_end (struct ui_out *uiout,
 331             enum ui_out_type type)
 332 {
 333   int old_level = pop_level (uiout, type);
 334
 335   uo_end (uiout, type, old_level);
 336 }
 337
 338 struct ui_out_end_cleanup_data
 339 {
 340   struct ui_out *uiout;
 341   enum ui_out_type type;
 342 };
 343
 344 static void
 345 do_cleanup_end (void *data)
 346 {
 347   struct ui_out_end_cleanup_data *end_cleanup_data
 348     = (struct ui_out_end_cleanup_data *) data;
 349
 350   ui_out_end (end_cleanup_data->uiout, end_cleanup_data->type);
 351   xfree (end_cleanup_data);
 352 }
 353
 354 static struct cleanup *
 355 make_cleanup_ui_out_end (struct ui_out *uiout,
 356                          enum ui_out_type type)
 357 {
 358   struct ui_out_end_cleanup_data *end_cleanup_data;
 359
 360   end_cleanup_data = XNEW (struct ui_out_end_cleanup_data);
 361   end_cleanup_data->uiout = uiout;
 362   end_cleanup_data->type = type;
 363   return make_cleanup (do_cleanup_end, end_cleanup_data);
 364 }
 365
 366 struct cleanup *
 367 make_cleanup_ui_out_tuple_begin_end (struct ui_out *uiout,
 368                                      const char *id)
 369 {
 370   ui_out_begin (uiout, ui_out_type_tuple, id);
 371   return make_cleanup_ui_out_end (uiout, ui_out_type_tuple);
 372 }
 373
 374 struct cleanup *
 375 make_cleanup_ui_out_list_begin_end (struct ui_out *uiout,
 376                                     const char *id)
 377 {
 378   ui_out_begin (uiout, ui_out_type_list, id);
 379   return make_cleanup_ui_out_end (uiout, ui_out_type_list);
 380 }
 381
 382 void
 383 ui_out_field_int (struct ui_out *uiout,
 384                   const char *fldname,
 385                   int value)
 386 {
 387   int fldno;
 388   int width;
 389   enum ui_align align;
 390
 391   verify_field (uiout, &fldno, &width, &align);
 392
 393   uo_field_int (uiout, fldno, width, align, fldname, value);
 394 }
 395
 396 void
 397 ui_out_field_fmt_int (struct ui_out *uiout,
 398                       int input_width,
 399                       enum ui_align input_align,
 400                       const char *fldname,
 401                       int value)
 402 {
 403   int fldno;
 404   int width;
 405   enum ui_align align;
 406
 407   verify_field (uiout, &fldno, &width, &align);
 408
 409   uo_field_int (uiout, fldno, input_width, input_align, fldname, value);
 410 }
 411
 412 /* Documented in ui-out.h.  */
 413
 414 void
 415 ui_out_field_core_addr (struct ui_out *uiout,
 416                         const char *fldname,
 417                         struct gdbarch *gdbarch,
 418                         CORE_ADDR address)
 419 {
 420   ui_out_field_string (uiout, fldname,
 421                        print_core_address (gdbarch, address));
 422 }
 423
 424 void
 425 ui_out_field_stream (struct ui_out *uiout,
 426                      const char *fldname,
 427                      struct ui_file *stream)
 428 {
 429   long length;
 430   char *buffer = ui_file_xstrdup (stream, &length);
 431   struct cleanup *old_cleanup = make_cleanup (xfree, buffer);
 432
 433   if (length > 0)
 434     ui_out_field_string (uiout, fldname, buffer);
 435   else
 436     ui_out_field_skip (uiout, fldname);
 437   ui_file_rewind (stream);
 438   do_cleanups (old_cleanup);
 439 }
 440
 441 /* Used to omit a field.  */
 442
 443 void
 444 ui_out_field_skip (struct ui_out *uiout,
 445                    const char *fldname)
 446 {
 447   int fldno;
 448   int width;
 449   enum ui_align align;
 450
 451   verify_field (uiout, &fldno, &width, &align);
 452
 453   uo_field_skip (uiout, fldno, width, align, fldname);
 454 }
 455
 456 void
 457 ui_out_field_string (struct ui_out *uiout,
 458                      const char *fldname,
 459                      const char *string)
 460 {
 461   int fldno;
 462   int width;
 463   enum ui_align align;
 464
 465   verify_field (uiout, &fldno, &width, &align);
 466
 467   uo_field_string (uiout, fldno, width, align, fldname, string);
 468 }
 469
 470 /* VARARGS */
 471 void
 472 ui_out_field_fmt (struct ui_out *uiout,
 473                   const char *fldname,
 474                   const char *format, ...)
 475 {
 476   va_list args;
 477   int fldno;
 478   int width;
 479   enum ui_align align;
 480
 481   /* Will not align, but has to call anyway.  */
 482   verify_field (uiout, &fldno, &width, &align);
 483
 484   va_start (args, format);
 485
 486   uo_field_fmt (uiout, fldno, width, align, fldname, format, args);
 487
 488   va_end (args);
 489 }
 490
 491 void
 492 ui_out_spaces (struct ui_out *uiout, int numspaces)
 493 {
 494   uo_spaces (uiout, numspaces);
 495 }
 496
 497 void
 498 ui_out_text (struct ui_out *uiout,
 499              const char *string)
 500 {
 501   uo_text (uiout, string);
 502 }
 503
 504 void
 505 ui_out_message (struct ui_out *uiout, int verbosity,
 506                 const char *format,...)
 507 {
 508   va_list args;
 509
 510   va_start (args, format);
 511   uo_message (uiout, verbosity, format, args);
 512   va_end (args);
 513 }
 514
 515 void
 516 ui_out_wrap_hint (struct ui_out *uiout, char *identstring)
 517 {
 518   uo_wrap_hint (uiout, identstring);
 519 }
 520
 521 void
 522 ui_out_flush (struct ui_out *uiout)
 523 {
 524   uo_flush (uiout);
 525 }
 526
 527 int
 528 ui_out_redirect (struct ui_out *uiout, struct ui_file *outstream)
 529 {
 530   return uo_redirect (uiout, outstream);
 531 }
 532
 533 /* Set the flags specified by the mask given.  */
 534 int
 535 ui_out_set_flags (struct ui_out *uiout, int mask)
 536 {
 537   int oldflags = uiout->flags;
 538
 539   uiout->flags |= mask;
 540   return oldflags;
 541 }
 542
 543 /* Clear the flags specified by the mask given.  */
 544 int
 545 ui_out_clear_flags (struct ui_out *uiout, int mask)
 546 {
 547   int oldflags = uiout->flags;
 548
 549   uiout->flags &= ~mask;
 550   return oldflags;
 551 }
 552
 553 /* Test the flags against the mask given.  */
 554 int
 555 ui_out_test_flags (struct ui_out *uiout, int mask)
 556 {
 557   return (uiout->flags & mask);
 558 }
 559
 560 /* Obtain the current verbosity level (as stablished by the
 561    'set verbositylevel' command.  */
 562
 563 int
 564 ui_out_get_verblvl (struct ui_out *uiout)
 565 {
 566   /* FIXME: not implemented yet.  */
 567   return 0;
 568 }
 569
 570 int
 571 ui_out_is_mi_like_p (struct ui_out *uiout)
 572 {
 573   return uiout->impl->is_mi_like_p;
 574 }
 575
 576 /* Interface to the implementation functions.  */
 577
 578 void
 579 uo_table_begin (struct ui_out *uiout, int nbrofcols,
 580                 int nr_rows,
 581                 const char *tblid)
 582 {
 583   if (!uiout->impl->table_begin)
 584     return;
 585   uiout->impl->table_begin (uiout, nbrofcols, nr_rows, tblid);
 586 }
 587
 588 void
 589 uo_table_body (struct ui_out *uiout)
 590 {
 591   if (!uiout->impl->table_body)
 592     return;
 593   uiout->impl->table_body (uiout);
 594 }
 595
 596 void
 597 uo_table_end (struct ui_out *uiout)
 598 {
 599   if (!uiout->impl->table_end)
 600     return;
 601   uiout->impl->table_end (uiout);
 602 }
 603
 604 void
 605 uo_table_header (struct ui_out *uiout, int width, enum ui_align align,
 606                  const char *col_name,
 607                  const char *colhdr)
 608 {
 609   if (!uiout->impl->table_header)
 610     return;
 611   uiout->impl->table_header (uiout, width, align, col_name, colhdr);
 612 }
 613
 614 /* Clear the table associated with UIOUT.  */
 615
 616 static void
 617 clear_table (struct ui_out *uiout)
 618 {
 619   xfree (uiout->table.id);
 620   uiout->table.id = NULL;
 621   clear_header_list (uiout);
 622 }
 623
 624 void
 625 uo_begin (struct ui_out *uiout,
 626           enum ui_out_type type,
 627           int level,
 628           const char *id)
 629 {
 630   if (uiout->impl->begin == NULL)
 631     return;
 632   uiout->impl->begin (uiout, type, level, id);
 633 }
 634
 635 void
 636 uo_end (struct ui_out *uiout,
 637         enum ui_out_type type,
 638         int level)
 639 {
 640   if (uiout->impl->end == NULL)
 641     return;
 642   uiout->impl->end (uiout, type, level);
 643 }
 644
 645 void
 646 uo_field_int (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 647               const char *fldname,
 648               int value)
 649 {
 650   if (!uiout->impl->field_int)
 651     return;
 652   uiout->impl->field_int (uiout, fldno, width, align, fldname, value);
 653 }
 654
 655 void
 656 uo_field_skip (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 657                const char *fldname)
 658 {
 659   if (!uiout->impl->field_skip)
 660     return;
 661   uiout->impl->field_skip (uiout, fldno, width, align, fldname);
 662 }
 663
 664 void
 665 uo_field_string (struct ui_out *uiout, int fldno, int width,
 666                  enum ui_align align,
 667                  const char *fldname,
 668                  const char *string)
 669 {
 670   if (!uiout->impl->field_string)
 671     return;
 672   uiout->impl->field_string (uiout, fldno, width, align, fldname, string);
 673 }
 674
 675 void
 676 uo_field_fmt (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 677               const char *fldname,
 678               const char *format,
 679               va_list args)
 680 {
 681   if (!uiout->impl->field_fmt)
 682     return;
 683   uiout->impl->field_fmt (uiout, fldno, width, align, fldname, format, args);
 684 }
 685
 686 void
 687 uo_spaces (struct ui_out *uiout, int numspaces)
 688 {
 689   if (!uiout->impl->spaces)
 690     return;
 691   uiout->impl->spaces (uiout, numspaces);
 692 }
 693
 694 void
 695 uo_text (struct ui_out *uiout,
 696          const char *string)
 697 {
 698   if (!uiout->impl->text)
 699     return;
 700   uiout->impl->text (uiout, string);
 701 }
 702
 703 void
 704 uo_message (struct ui_out *uiout, int verbosity,
 705             const char *format,
 706             va_list args)
 707 {
 708   if (!uiout->impl->message)
 709     return;
 710   uiout->impl->message (uiout, verbosity, format, args);
 711 }
 712
 713 void
 714 uo_wrap_hint (struct ui_out *uiout, char *identstring)
 715 {
 716   if (!uiout->impl->wrap_hint)
 717     return;
 718   uiout->impl->wrap_hint (uiout, identstring);
 719 }
 720
 721 void
 722 uo_flush (struct ui_out *uiout)
 723 {
 724   if (!uiout->impl->flush)
 725     return;
 726   uiout->impl->flush (uiout);
 727 }
 728
 729 int
 730 uo_redirect (struct ui_out *uiout, struct ui_file *outstream)
 731 {
 732   if (!uiout->impl->redirect)
 733     return -1;
 734   uiout->impl->redirect (uiout, outstream);
 735   return 0;
 736 }
 737
 738 void
 739 uo_data_destroy (struct ui_out *uiout)
 740 {
 741   if (!uiout->impl->data_destroy)
 742     return;
 743
 744   uiout->impl->data_destroy (uiout);
 745 }
 746
 747 /* local functions */
 748
 749 /* List of column headers manipulation routines.  */
 750
 751 static void
 752 clear_header_list (struct ui_out *uiout)
 753 {
 754   while (uiout->table.header_first != NULL)
 755     {
 756       uiout->table.header_next = uiout->table.header_first;
 757       uiout->table.header_first = uiout->table.header_first->next;
 758       xfree (uiout->table.header_next->colhdr);
 759       xfree (uiout->table.header_next->col_name);
 760       xfree (uiout->table.header_next);
 761     }
 762   gdb_assert (uiout->table.header_first == NULL);
 763   uiout->table.header_last = NULL;
 764   uiout->table.header_next = NULL;
 765 }
 766
 767 static void
 768 append_header_to_list (struct ui_out *uiout,
 769                        int width,
 770                        enum ui_align alignment,
 771                        const char *col_name,
 772                        const char *colhdr)
 773 {
 774   struct ui_out_hdr *temphdr;
 775
 776   temphdr = XNEW (struct ui_out_hdr);
 777   temphdr->width = width;
 778   temphdr->alignment = alignment;
 779   /* We have to copy the column title as the original may be an
 780      automatic.  */
 781   if (colhdr != NULL)
 782     temphdr->colhdr = xstrdup (colhdr);
 783   else
 784     temphdr->colhdr = NULL;
 785
 786   if (col_name != NULL)
 787     temphdr->col_name = xstrdup (col_name);
 788   else if (colhdr != NULL)
 789     temphdr->col_name = xstrdup (colhdr);
 790   else
 791     temphdr->col_name = NULL;
 792
 793   temphdr->next = NULL;
 794   if (uiout->table.header_first == NULL)
 795     {
 796       temphdr->colno = 1;
 797       uiout->table.header_first = temphdr;
 798       uiout->table.header_last = temphdr;
 799     }
 800   else
 801     {
 802       temphdr->colno = uiout->table.header_last->colno + 1;
 803       uiout->table.header_last->next = temphdr;
 804       uiout->table.header_last = temphdr;
 805     }
 806   uiout->table.header_next = uiout->table.header_last;
 807 }
 808
 809 /* Extract the format information for the NEXT header and advance
 810    the header pointer.  Return 0 if there was no next header.  */
 811
 812 static int
 813 get_next_header (struct ui_out *uiout,
 814                  int *colno,
 815                  int *width,
 816                  enum ui_align *alignment,
 817                  char **colhdr)
 818 {
 819   /* There may be no headers at all or we may have used all columns.  */
 820   if (uiout->table.header_next == NULL)
 821     return 0;
 822   *colno = uiout->table.header_next->colno;
 823   *width = uiout->table.header_next->width;
 824   *alignment = uiout->table.header_next->alignment;
 825   *colhdr = uiout->table.header_next->colhdr;
 826   /* Advance the header pointer to the next entry.  */
 827   uiout->table.header_next = uiout->table.header_next->next;
 828   return 1;
 829 }
 830
 831
 832 /* Verify that the field/tuple/list is correctly positioned.  Return
 833    the field number and corresponding alignment (if
 834    available/applicable).  */
 835
 836 static void
 837 verify_field (struct ui_out *uiout, int *fldno, int *width,
 838               enum ui_align *align)
 839 {
 840   struct ui_out_level *current = current_level (uiout);
 841   char *text;
 842
 843   if (uiout->table.flag)
 844     {
 845       if (!uiout->table.body_flag)
 846         internal_error (__FILE__, __LINE__,
 847                         _("table_body missing; table fields must be \
 848 specified after table_body and inside a list."));
 849       /* NOTE: cagney/2001-12-08: There was a check here to ensure
 850          that this code was only executed when uiout->level was
 851          greater than zero.  That no longer applies - this code is run
 852          before each table row tuple is started and at that point the
 853          level is zero.  */
 854     }
 855
 856   current->field_count += 1;
 857
 858   if (uiout->table.body_flag
 859       && uiout->table.entry_level == uiout->level
 860       && get_next_header (uiout, fldno, width, align, &text))
 861     {
 862       if (*fldno != current->field_count)
 863         internal_error (__FILE__, __LINE__,
 864                         _("ui-out internal error in handling headers."));
 865     }
 866   else
 867     {
 868       *width = 0;
 869       *align = ui_noalign;
 870       *fldno = current->field_count;
 871     }
 872 }
 873
 874
 875 /* Access to ui-out members data.  */
 876
 877 void *
 878 ui_out_data (struct ui_out *uiout)
 879 {
 880   return uiout->data;
 881 }
 882
 883 /* Access table field parameters.  */
 884 int
 885 ui_out_query_field (struct ui_out *uiout, int colno,
 886                     int *width, int *alignment, char **col_name)
 887 {
 888   struct ui_out_hdr *hdr;
 889
 890   if (!uiout->table.flag)
 891     return 0;
 892
 893   for (hdr = uiout->table.header_first; hdr; hdr = hdr->next)
 894     if (hdr->colno == colno)
 895       {
 896         *width = hdr->width;
 897         *alignment = hdr->alignment;
 898         *col_name = hdr->col_name;
 899         return 1;
 900       }
 901
 902   return 0;
 903 }
 904
 905 /* Initalize private members at startup.  */
 906
 907 struct ui_out *
 908 ui_out_new (const struct ui_out_impl *impl, void *data,
 909             int flags)
 910 {
 911   struct ui_out *uiout = XNEW (struct ui_out);
 912   struct ui_out_level *current = XNEW (struct ui_out_level);
 913
 914   uiout->data = data;
 915   uiout->impl = impl;
 916   uiout->flags = flags;
 917   uiout->table.flag = 0;
 918   uiout->table.body_flag = 0;
 919   uiout->level = 0;
 920   uiout->levels = NULL;
 921
 922   /* Create uiout->level 0, the default level.  */
 923   current->type = ui_out_type_tuple;
 924   current->field_count = 0;
 925   VEC_safe_push (ui_out_level_p, uiout->levels, current);
 926
 927   uiout->table.id = NULL;
 928   uiout->table.header_first = NULL;
 929   uiout->table.header_last = NULL;
 930   uiout->table.header_next = NULL;
 931   return uiout;
 932 }
 933
 934 /* Free  UIOUT and the memory areas it references.  */
 935
 936 void
 937 ui_out_destroy (struct ui_out *uiout)
 938 {
 939   int i;
 940   struct ui_out_level *current;
 941
 942   /* Make sure that all levels are freed in the case where levels have
 943      been pushed, but not popped before the ui_out object is
 944      destroyed.  */
 945   for (i = 0;
 946        VEC_iterate (ui_out_level_p, uiout->levels, i, current);
 947        ++i)
 948     xfree (current);
 949
 950   VEC_free (ui_out_level_p, uiout->levels);
 951   uo_data_destroy (uiout);
 952   clear_table (uiout);
 953   xfree (uiout);
 954 }
 955
 956 /* Standard gdb initialization hook.  */
 957
 958 void
 959 _initialize_ui_out (void)
 960 {
 961   /* nothing needs to be done */
 962 }