gdb/ui-out.c

   1 /* Output generating routines for GDB.
   2
   3    Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005
   4    Free Software Foundation, Inc.
   5
   6    Contributed by Cygnus Solutions.
   7    Written by Fernando Nasser for Cygnus.
   8
   9    This file is part of GDB.
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24    Boston, MA 02110-1301, USA.  */
  25
  26 #include "defs.h"
  27 #include "gdb_string.h"
  28 #include "expression.h"         /* For language.h */
  29 #include "language.h"
  30 #include "ui-out.h"
  31 #include "gdb_assert.h"
  32
  33 /* table header structures */
  34
  35 struct ui_out_hdr
  36   {
  37     int colno;
  38     int width;
  39     int alignment;
  40     char *col_name;
  41     char *colhdr;
  42     struct ui_out_hdr *next;
  43   };
  44
  45 /* Maintain a stack so that the info applicable to the inner most list
  46    is always available.  Stack/nested level 0 is reserved for the
  47    top-level result. */
  48
  49 enum { MAX_UI_OUT_LEVELS = 6 };
  50
  51 struct ui_out_level
  52   {
  53     /* Count each field; the first element is for non-list fields */
  54     int field_count;
  55     /* The type of this level. */
  56     enum ui_out_type type;
  57   };
  58
  59 /* Tables are special.  Maintain a separate structure that tracks
  60    their state.  At present an output can only contain a single table
  61    but that restriction might eventually be lifted.  */
  62
  63 struct ui_out_table
  64 {
  65   /* If on, a table is being generated.  */
  66   int flag;
  67
  68   /* If on, the body of a table is being generated.  If off, the table
  69      header is being generated.  */
  70   int body_flag;
  71
  72   /* The level at which each entry of the table is to be found.  A row
  73      (a tuple) is made up of entries.  Consequently ENTRY_LEVEL is one
  74      above that of the table.  */
  75   int entry_level;
  76
  77   /* Number of table columns (as specified in the table_begin call).  */
  78   int columns;
  79
  80   /* String identifying the table (as specified in the table_begin
  81      call).  */
  82   char *id;
  83
  84   /* Points to the first table header (if any).  */
  85   struct ui_out_hdr *header_first;
  86
  87   /* Points to the last table header (if any).  */
  88   struct ui_out_hdr *header_last;
  89
  90   /* Points to header of NEXT column to format.  */
  91   struct ui_out_hdr *header_next;
  92
  93 };
  94
  95
  96 /* The ui_out structure */
  97 /* Any change here requires a corresponding one in the initialization
  98    of the default uiout, which is statically initialized */
  99
 100 struct ui_out
 101   {
 102     int flags;
 103     /* specific implementation of ui-out */
 104     struct ui_out_impl *impl;
 105     struct ui_out_data *data;
 106
 107     /* Sub structure tracking the ui-out depth.  */
 108     int level;
 109     struct ui_out_level levels[MAX_UI_OUT_LEVELS];
 110
 111     /* A table, if any.  At present only a single table is supported.  */
 112     struct ui_out_table table;
 113   };
 114
 115 /* The current (inner most) level. */
 116 static struct ui_out_level *
 117 current_level (struct ui_out *uiout)
 118 {
 119   return &uiout->levels[uiout->level];
 120 }
 121
 122 /* Create a new level, of TYPE.  Return the new level's index. */
 123 static int
 124 push_level (struct ui_out *uiout,
 125             enum ui_out_type type,
 126             const char *id)
 127 {
 128   struct ui_out_level *current;
 129   /* We had better not overflow the buffer. */
 130   uiout->level++;
 131   gdb_assert (uiout->level >= 0 && uiout->level < MAX_UI_OUT_LEVELS);
 132   current = current_level (uiout);
 133   current->field_count = 0;
 134   current->type = type;
 135   return uiout->level;
 136 }
 137
 138 /* Discard the current level, return the discarded level's index.
 139    TYPE is the type of the level being discarded. */
 140 static int
 141 pop_level (struct ui_out *uiout,
 142            enum ui_out_type type)
 143 {
 144   /* We had better not underflow the buffer. */
 145   gdb_assert (uiout->level > 0 && uiout->level < MAX_UI_OUT_LEVELS);
 146   gdb_assert (current_level (uiout)->type == type);
 147   uiout->level--;
 148   return uiout->level + 1;
 149 }
 150
 151
 152 /* These are the default implementation functions */
 153
 154 static void default_table_begin (struct ui_out *uiout, int nbrofcols,
 155                                  int nr_rows, const char *tblid);
 156 static void default_table_body (struct ui_out *uiout);
 157 static void default_table_end (struct ui_out *uiout);
 158 static void default_table_header (struct ui_out *uiout, int width,
 159                                   enum ui_align alig, const char *col_name,
 160                                   const char *colhdr);
 161 static void default_begin (struct ui_out *uiout,
 162                            enum ui_out_type type,
 163                            int level, const char *id);
 164 static void default_end (struct ui_out *uiout,
 165                          enum ui_out_type type,
 166                          int level);
 167 static void default_field_int (struct ui_out *uiout, int fldno, int width,
 168                                enum ui_align alig,
 169                                const char *fldname,
 170                                int value);
 171 static void default_field_skip (struct ui_out *uiout, int fldno, int width,
 172                                 enum ui_align alig,
 173                                 const char *fldname);
 174 static void default_field_string (struct ui_out *uiout, int fldno, int width,
 175                                   enum ui_align align,
 176                                   const char *fldname,
 177                                   const char *string);
 178 static void default_field_fmt (struct ui_out *uiout, int fldno,
 179                                int width, enum ui_align align,
 180                                const char *fldname,
 181                                const char *format,
 182                                va_list args) ATTR_FORMAT (printf, 6, 0);
 183 static void default_spaces (struct ui_out *uiout, int numspaces);
 184 static void default_text (struct ui_out *uiout, const char *string);
 185 static void default_message (struct ui_out *uiout, int verbosity,
 186                              const char *format,
 187                              va_list args) ATTR_FORMAT (printf, 3, 0);
 188 static void default_wrap_hint (struct ui_out *uiout, char *identstring);
 189 static void default_flush (struct ui_out *uiout);
 190
 191 /* This is the default ui-out implementation functions vector */
 192
 193 struct ui_out_impl default_ui_out_impl =
 194 {
 195   default_table_begin,
 196   default_table_body,
 197   default_table_end,
 198   default_table_header,
 199   default_begin,
 200   default_end,
 201   default_field_int,
 202   default_field_skip,
 203   default_field_string,
 204   default_field_fmt,
 205   default_spaces,
 206   default_text,
 207   default_message,
 208   default_wrap_hint,
 209   default_flush,
 210   NULL,
 211   0, /* Does not need MI hacks.  */
 212 };
 213
 214 /* The default ui_out */
 215
 216 struct ui_out def_uiout =
 217 {
 218   0,                            /* flags */
 219   &default_ui_out_impl,         /* impl */
 220 };
 221
 222 /* Pointer to current ui_out */
 223 /* FIXME: This should not be a global, but something passed down from main.c
 224    or top.c */
 225
 226 struct ui_out *uiout = &def_uiout;
 227
 228 /* These are the interfaces to implementation functions */
 229
 230 static void uo_table_begin (struct ui_out *uiout, int nbrofcols,
 231                             int nr_rows, const char *tblid);
 232 static void uo_table_body (struct ui_out *uiout);
 233 static void uo_table_end (struct ui_out *uiout);
 234 static void uo_table_header (struct ui_out *uiout, int width,
 235                              enum ui_align align, const char *col_name,
 236                              const char *colhdr);
 237 static void uo_begin (struct ui_out *uiout,
 238                       enum ui_out_type type,
 239                       int level, const char *id);
 240 static void uo_end (struct ui_out *uiout,
 241                     enum ui_out_type type,
 242                     int level);
 243 static void uo_field_int (struct ui_out *uiout, int fldno, int width,
 244                           enum ui_align align, const char *fldname, int value);
 245 static void uo_field_skip (struct ui_out *uiout, int fldno, int width,
 246                            enum ui_align align, const char *fldname);
 247 static void uo_field_string (struct ui_out *uiout, int fldno, int width,
 248                              enum ui_align align, const char *fldname,
 249                              const char *string);
 250 static void uo_field_fmt (struct ui_out *uiout, int fldno, int width,
 251                           enum ui_align align, const char *fldname,
 252                           const char *format, va_list args)
 253      ATTR_FORMAT (printf, 6, 0);
 254 static void uo_spaces (struct ui_out *uiout, int numspaces);
 255 static void uo_text (struct ui_out *uiout, const char *string);
 256 static void uo_message (struct ui_out *uiout, int verbosity,
 257                         const char *format, va_list args)
 258      ATTR_FORMAT (printf, 3, 0);
 259 static void uo_wrap_hint (struct ui_out *uiout, char *identstring);
 260 static void uo_flush (struct ui_out *uiout);
 261 static int uo_redirect (struct ui_out *uiout, struct ui_file *outstream);
 262
 263 /* Prototypes for local functions */
 264
 265 extern void _initialize_ui_out (void);
 266 static void append_header_to_list (struct ui_out *uiout, int width,
 267                                    int alignment, const char *col_name,
 268                                    const char *colhdr);
 269 static int get_next_header (struct ui_out *uiout, int *colno, int *width,
 270                             int *alignment, char **colhdr);
 271 static void clear_header_list (struct ui_out *uiout);
 272 static void verify_field (struct ui_out *uiout, int *fldno, int *width,
 273                           int *align);
 274
 275 /* exported functions (ui_out API) */
 276
 277 /* Mark beginning of a table */
 278
 279 static void
 280 ui_out_table_begin (struct ui_out *uiout, int nbrofcols,
 281                     int nr_rows,
 282                     const char *tblid)
 283 {
 284   if (uiout->table.flag)
 285     internal_error (__FILE__, __LINE__,
 286                     _("tables cannot be nested; table_begin found before \
 287 previous table_end."));
 288
 289   uiout->table.flag = 1;
 290   uiout->table.body_flag = 0;
 291   uiout->table.entry_level = uiout->level + 1;
 292   uiout->table.columns = nbrofcols;
 293   if (tblid != NULL)
 294     uiout->table.id = xstrdup (tblid);
 295   else
 296     uiout->table.id = NULL;
 297   clear_header_list (uiout);
 298
 299   uo_table_begin (uiout, nbrofcols, nr_rows, uiout->table.id);
 300 }
 301
 302 void
 303 ui_out_table_body (struct ui_out *uiout)
 304 {
 305   if (!uiout->table.flag)
 306     internal_error (__FILE__, __LINE__,
 307                     _("table_body outside a table is not valid; it must be \
 308 after a table_begin and before a table_end."));
 309   if (uiout->table.body_flag)
 310     internal_error (__FILE__, __LINE__,
 311                     _("extra table_body call not allowed; there must be \
 312 only one table_body after a table_begin and before a table_end."));
 313   if (uiout->table.header_next->colno != uiout->table.columns)
 314     internal_error (__FILE__, __LINE__,
 315                     _("number of headers differ from number of table \
 316 columns."));
 317
 318   uiout->table.body_flag = 1;
 319   uiout->table.header_next = uiout->table.header_first;
 320
 321   uo_table_body (uiout);
 322 }
 323
 324 static void
 325 ui_out_table_end (struct ui_out *uiout)
 326 {
 327   if (!uiout->table.flag)
 328     internal_error (__FILE__, __LINE__,
 329                     _("misplaced table_end or missing table_begin."));
 330
 331   uiout->table.entry_level = 0;
 332   uiout->table.body_flag = 0;
 333   uiout->table.flag = 0;
 334
 335   uo_table_end (uiout);
 336
 337   if (uiout->table.id)
 338     xfree (uiout->table.id);
 339   clear_header_list (uiout);
 340 }
 341
 342 void
 343 ui_out_table_header (struct ui_out *uiout, int width, enum ui_align alignment,
 344                      const char *col_name,
 345                      const char *colhdr)
 346 {
 347   if (!uiout->table.flag || uiout->table.body_flag)
 348     internal_error (__FILE__, __LINE__,
 349                     _("table header must be specified after table_begin \
 350 and before table_body."));
 351
 352   append_header_to_list (uiout, width, alignment, col_name, colhdr);
 353
 354   uo_table_header (uiout, width, alignment, col_name, colhdr);
 355 }
 356
 357 static void
 358 do_cleanup_table_end (void *data)
 359 {
 360   struct ui_out *ui_out = data;
 361
 362   ui_out_table_end (ui_out);
 363 }
 364
 365 struct cleanup *
 366 make_cleanup_ui_out_table_begin_end (struct ui_out *ui_out, int nr_cols,
 367                                      int nr_rows, const char *tblid)
 368 {
 369   ui_out_table_begin (ui_out, nr_cols, nr_rows, tblid);
 370   return make_cleanup (do_cleanup_table_end, ui_out);
 371 }
 372
 373 void
 374 ui_out_begin (struct ui_out *uiout,
 375               enum ui_out_type type,
 376               const char *id)
 377 {
 378   int new_level;
 379   if (uiout->table.flag && !uiout->table.body_flag)
 380     internal_error (__FILE__, __LINE__,
 381                     _("table header or table_body expected; lists must be \
 382 specified after table_body."));
 383
 384   /* Be careful to verify the ``field'' before the new tuple/list is
 385      pushed onto the stack.  That way the containing list/table/row is
 386      verified and not the newly created tuple/list.  This verification
 387      is needed (at least) for the case where a table row entry
 388      contains either a tuple/list.  For that case bookkeeping such as
 389      updating the column count or advancing to the next heading still
 390      needs to be performed.  */
 391   {
 392     int fldno;
 393     int width;
 394     int align;
 395     verify_field (uiout, &fldno, &width, &align);
 396   }
 397
 398   new_level = push_level (uiout, type, id);
 399
 400   /* If the push puts us at the same level as a table row entry, we've
 401      got a new table row.  Put the header pointer back to the start.  */
 402   if (uiout->table.body_flag
 403       && uiout->table.entry_level == new_level)
 404     uiout->table.header_next = uiout->table.header_first;
 405
 406   uo_begin (uiout, type, new_level, id);
 407 }
 408
 409 void
 410 ui_out_end (struct ui_out *uiout,
 411             enum ui_out_type type)
 412 {
 413   int old_level = pop_level (uiout, type);
 414   uo_end (uiout, type, old_level);
 415 }
 416
 417 struct ui_out_end_cleanup_data
 418 {
 419   struct ui_out *uiout;
 420   enum ui_out_type type;
 421 };
 422
 423 static void
 424 do_cleanup_end (void *data)
 425 {
 426   struct ui_out_end_cleanup_data *end_cleanup_data = data;
 427   ui_out_end (end_cleanup_data->uiout, end_cleanup_data->type);
 428   xfree (end_cleanup_data);
 429 }
 430
 431 static struct cleanup *
 432 make_cleanup_ui_out_end (struct ui_out *uiout,
 433                          enum ui_out_type type)
 434 {
 435   struct ui_out_end_cleanup_data *end_cleanup_data;
 436   end_cleanup_data = XMALLOC (struct ui_out_end_cleanup_data);
 437   end_cleanup_data->uiout = uiout;
 438   end_cleanup_data->type = type;
 439   return make_cleanup (do_cleanup_end, end_cleanup_data);
 440 }
 441
 442 struct cleanup *
 443 make_cleanup_ui_out_tuple_begin_end (struct ui_out *uiout,
 444                                      const char *id)
 445 {
 446   ui_out_begin (uiout, ui_out_type_tuple, id);
 447   return make_cleanup_ui_out_end (uiout, ui_out_type_tuple);
 448 }
 449
 450 struct cleanup *
 451 make_cleanup_ui_out_list_begin_end (struct ui_out *uiout,
 452                                     const char *id)
 453 {
 454   ui_out_begin (uiout, ui_out_type_list, id);
 455   return make_cleanup_ui_out_end (uiout, ui_out_type_list);
 456 }
 457
 458 void
 459 ui_out_field_int (struct ui_out *uiout,
 460                   const char *fldname,
 461                   int value)
 462 {
 463   int fldno;
 464   int width;
 465   int align;
 466   struct ui_out_level *current = current_level (uiout);
 467
 468   verify_field (uiout, &fldno, &width, &align);
 469
 470   uo_field_int (uiout, fldno, width, align, fldname, value);
 471 }
 472
 473 void
 474 ui_out_field_fmt_int (struct ui_out *uiout,
 475                       int input_width,
 476                       enum ui_align input_align,
 477                       const char *fldname,
 478                       int value)
 479 {
 480   int fldno;
 481   int width;
 482   int align;
 483   struct ui_out_level *current = current_level (uiout);
 484
 485   verify_field (uiout, &fldno, &width, &align);
 486
 487   uo_field_int (uiout, fldno, input_width, input_align, fldname, value);
 488 }
 489
 490 void
 491 ui_out_field_core_addr (struct ui_out *uiout,
 492                         const char *fldname,
 493                         CORE_ADDR address)
 494 {
 495   char addstr[20];
 496
 497   /* FIXME: cagney/2002-05-03: Need local_address_string() function
 498      that returns the language localized string formatted to a width
 499      based on TARGET_ADDR_BIT.  */
 500   /* deprecated_print_address_numeric (address, 1, local_stream); */
 501   if (TARGET_ADDR_BIT <= 32)
 502     strcpy (addstr, hex_string_custom (address, 8));
 503   else
 504     strcpy (addstr, hex_string_custom (address, 16));
 505
 506   ui_out_field_string (uiout, fldname, addstr);
 507 }
 508
 509 void
 510 ui_out_field_stream (struct ui_out *uiout,
 511                      const char *fldname,
 512                      struct ui_stream *buf)
 513 {
 514   long length;
 515   char *buffer = ui_file_xstrdup (buf->stream, &length);
 516   struct cleanup *old_cleanup = make_cleanup (xfree, buffer);
 517   if (length > 0)
 518     ui_out_field_string (uiout, fldname, buffer);
 519   else
 520     ui_out_field_skip (uiout, fldname);
 521   ui_file_rewind (buf->stream);
 522   do_cleanups (old_cleanup);
 523 }
 524
 525 /* used to ommit a field */
 526
 527 void
 528 ui_out_field_skip (struct ui_out *uiout,
 529                    const char *fldname)
 530 {
 531   int fldno;
 532   int width;
 533   int align;
 534
 535   verify_field (uiout, &fldno, &width, &align);
 536
 537   uo_field_skip (uiout, fldno, width, align, fldname);
 538 }
 539
 540 void
 541 ui_out_field_string (struct ui_out *uiout,
 542                      const char *fldname,
 543                      const char *string)
 544 {
 545   int fldno;
 546   int width;
 547   int align;
 548
 549   verify_field (uiout, &fldno, &width, &align);
 550
 551   uo_field_string (uiout, fldno, width, align, fldname, string);
 552 }
 553
 554 /* VARARGS */
 555 void
 556 ui_out_field_fmt (struct ui_out *uiout,
 557                   const char *fldname,
 558                   const char *format, ...)
 559 {
 560   va_list args;
 561   int fldno;
 562   int width;
 563   int align;
 564
 565   /* will not align, but has to call anyway */
 566   verify_field (uiout, &fldno, &width, &align);
 567
 568   va_start (args, format);
 569
 570   uo_field_fmt (uiout, fldno, width, align, fldname, format, args);
 571
 572   va_end (args);
 573 }
 574
 575 void
 576 ui_out_spaces (struct ui_out *uiout, int numspaces)
 577 {
 578   uo_spaces (uiout, numspaces);
 579 }
 580
 581 void
 582 ui_out_text (struct ui_out *uiout,
 583              const char *string)
 584 {
 585   uo_text (uiout, string);
 586 }
 587
 588 void
 589 ui_out_message (struct ui_out *uiout, int verbosity,
 590                 const char *format,...)
 591 {
 592   va_list args;
 593
 594   va_start (args, format);
 595
 596   uo_message (uiout, verbosity, format, args);
 597
 598   va_end (args);
 599 }
 600
 601 struct ui_stream *
 602 ui_out_stream_new (struct ui_out *uiout)
 603 {
 604   struct ui_stream *tempbuf;
 605
 606   tempbuf = XMALLOC (struct ui_stream);
 607   tempbuf->uiout = uiout;
 608   tempbuf->stream = mem_fileopen ();
 609   return tempbuf;
 610 }
 611
 612 void
 613 ui_out_stream_delete (struct ui_stream *buf)
 614 {
 615   ui_file_delete (buf->stream);
 616   xfree (buf);
 617 }
 618
 619 static void
 620 do_stream_delete (void *buf)
 621 {
 622   ui_out_stream_delete (buf);
 623 }
 624
 625 struct cleanup *
 626 make_cleanup_ui_out_stream_delete (struct ui_stream *buf)
 627 {
 628   return make_cleanup (do_stream_delete, buf);
 629 }
 630
 631
 632 void
 633 ui_out_wrap_hint (struct ui_out *uiout, char *identstring)
 634 {
 635   uo_wrap_hint (uiout, identstring);
 636 }
 637
 638 void
 639 ui_out_flush (struct ui_out *uiout)
 640 {
 641   uo_flush (uiout);
 642 }
 643
 644 int
 645 ui_out_redirect (struct ui_out *uiout, struct ui_file *outstream)
 646 {
 647   return uo_redirect (uiout, outstream);
 648 }
 649
 650 /* set the flags specified by the mask given */
 651 int
 652 ui_out_set_flags (struct ui_out *uiout, int mask)
 653 {
 654   int oldflags = uiout->flags;
 655
 656   uiout->flags |= mask;
 657
 658   return oldflags;
 659 }
 660
 661 /* clear the flags specified by the mask given */
 662 int
 663 ui_out_clear_flags (struct ui_out *uiout, int mask)
 664 {
 665   int oldflags = uiout->flags;
 666
 667   uiout->flags &= ~mask;
 668
 669   return oldflags;
 670 }
 671
 672 /* test the flags against the mask given */
 673 int
 674 ui_out_test_flags (struct ui_out *uiout, int mask)
 675 {
 676   return (uiout->flags & mask);
 677 }
 678
 679 /* obtain the current verbosity level (as stablished by the
 680    'set verbositylevel' command */
 681
 682 int
 683 ui_out_get_verblvl (struct ui_out *uiout)
 684 {
 685   /* FIXME: not implemented yet */
 686   return 0;
 687 }
 688
 689 #if 0
 690 void
 691 ui_out_result_begin (struct ui_out *uiout, char *class)
 692 {
 693 }
 694
 695 void
 696 ui_out_result_end (struct ui_out *uiout)
 697 {
 698 }
 699
 700 void
 701 ui_out_info_begin (struct ui_out *uiout, char *class)
 702 {
 703 }
 704
 705 void
 706 ui_out_info_end (struct ui_out *uiout)
 707 {
 708 }
 709
 710 void
 711 ui_out_notify_begin (struct ui_out *uiout, char *class)
 712 {
 713 }
 714
 715 void
 716 ui_out_notify_end (struct ui_out *uiout)
 717 {
 718 }
 719
 720 void
 721 ui_out_error_begin (struct ui_out *uiout, char *class)
 722 {
 723 }
 724
 725 void
 726 ui_out_error_end (struct ui_out *uiout)
 727 {
 728 }
 729 #endif
 730
 731 #if 0
 732 void
 733 gdb_error (ui_out * uiout, int severity, char *format,...)
 734 {
 735   va_list args;
 736 }
 737
 738 void
 739 gdb_query (struct ui_out *uiout, int qflags, char *qprompt)
 740 {
 741 }
 742 #endif
 743
 744 int
 745 ui_out_is_mi_like_p (struct ui_out *uiout)
 746 {
 747   return uiout->impl->is_mi_like_p;
 748 }
 749
 750 /* default gdb-out hook functions */
 751
 752 static void
 753 default_table_begin (struct ui_out *uiout, int nbrofcols,
 754                      int nr_rows,
 755                      const char *tblid)
 756 {
 757 }
 758
 759 static void
 760 default_table_body (struct ui_out *uiout)
 761 {
 762 }
 763
 764 static void
 765 default_table_end (struct ui_out *uiout)
 766 {
 767 }
 768
 769 static void
 770 default_table_header (struct ui_out *uiout, int width, enum ui_align alignment,
 771                       const char *col_name,
 772                       const char *colhdr)
 773 {
 774 }
 775
 776 static void
 777 default_begin (struct ui_out *uiout,
 778                enum ui_out_type type,
 779                int level,
 780                const char *id)
 781 {
 782 }
 783
 784 static void
 785 default_end (struct ui_out *uiout,
 786              enum ui_out_type type,
 787              int level)
 788 {
 789 }
 790
 791 static void
 792 default_field_int (struct ui_out *uiout, int fldno, int width,
 793                    enum ui_align align,
 794                    const char *fldname, int value)
 795 {
 796 }
 797
 798 static void
 799 default_field_skip (struct ui_out *uiout, int fldno, int width,
 800                     enum ui_align align, const char *fldname)
 801 {
 802 }
 803
 804 static void
 805 default_field_string (struct ui_out *uiout,
 806                       int fldno,
 807                       int width,
 808                       enum ui_align align,
 809                       const char *fldname,
 810                       const char *string)
 811 {
 812 }
 813
 814 static void
 815 default_field_fmt (struct ui_out *uiout, int fldno, int width,
 816                    enum ui_align align,
 817                    const char *fldname,
 818                    const char *format,
 819                    va_list args)
 820 {
 821 }
 822
 823 static void
 824 default_spaces (struct ui_out *uiout, int numspaces)
 825 {
 826 }
 827
 828 static void
 829 default_text (struct ui_out *uiout, const char *string)
 830 {
 831 }
 832
 833 static void
 834 default_message (struct ui_out *uiout, int verbosity,
 835                  const char *format,
 836                  va_list args)
 837 {
 838 }
 839
 840 static void
 841 default_wrap_hint (struct ui_out *uiout, char *identstring)
 842 {
 843 }
 844
 845 static void
 846 default_flush (struct ui_out *uiout)
 847 {
 848 }
 849
 850 /* Interface to the implementation functions */
 851
 852 void
 853 uo_table_begin (struct ui_out *uiout, int nbrofcols,
 854                 int nr_rows,
 855                 const char *tblid)
 856 {
 857   if (!uiout->impl->table_begin)
 858     return;
 859   uiout->impl->table_begin (uiout, nbrofcols, nr_rows, tblid);
 860 }
 861
 862 void
 863 uo_table_body (struct ui_out *uiout)
 864 {
 865   if (!uiout->impl->table_body)
 866     return;
 867   uiout->impl->table_body (uiout);
 868 }
 869
 870 void
 871 uo_table_end (struct ui_out *uiout)
 872 {
 873   if (!uiout->impl->table_end)
 874     return;
 875   uiout->impl->table_end (uiout);
 876 }
 877
 878 void
 879 uo_table_header (struct ui_out *uiout, int width, enum ui_align align,
 880                  const char *col_name,
 881                  const char *colhdr)
 882 {
 883   if (!uiout->impl->table_header)
 884     return;
 885   uiout->impl->table_header (uiout, width, align, col_name, colhdr);
 886 }
 887
 888 void
 889 uo_begin (struct ui_out *uiout,
 890           enum ui_out_type type,
 891           int level,
 892           const char *id)
 893 {
 894   if (uiout->impl->begin == NULL)
 895     return;
 896   uiout->impl->begin (uiout, type, level, id);
 897 }
 898
 899 void
 900 uo_end (struct ui_out *uiout,
 901         enum ui_out_type type,
 902         int level)
 903 {
 904   if (uiout->impl->end == NULL)
 905     return;
 906   uiout->impl->end (uiout, type, level);
 907 }
 908
 909 void
 910 uo_field_int (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 911               const char *fldname,
 912               int value)
 913 {
 914   if (!uiout->impl->field_int)
 915     return;
 916   uiout->impl->field_int (uiout, fldno, width, align, fldname, value);
 917 }
 918
 919 void
 920 uo_field_skip (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 921                const char *fldname)
 922 {
 923   if (!uiout->impl->field_skip)
 924     return;
 925   uiout->impl->field_skip (uiout, fldno, width, align, fldname);
 926 }
 927
 928 void
 929 uo_field_string (struct ui_out *uiout, int fldno, int width,
 930                  enum ui_align align,
 931                  const char *fldname,
 932                  const char *string)
 933 {
 934   if (!uiout->impl->field_string)
 935     return;
 936   uiout->impl->field_string (uiout, fldno, width, align, fldname, string);
 937 }
 938
 939 void
 940 uo_field_fmt (struct ui_out *uiout, int fldno, int width, enum ui_align align,
 941               const char *fldname,
 942               const char *format,
 943               va_list args)
 944 {
 945   if (!uiout->impl->field_fmt)
 946     return;
 947   uiout->impl->field_fmt (uiout, fldno, width, align, fldname, format, args);
 948 }
 949
 950 void
 951 uo_spaces (struct ui_out *uiout, int numspaces)
 952 {
 953   if (!uiout->impl->spaces)
 954     return;
 955   uiout->impl->spaces (uiout, numspaces);
 956 }
 957
 958 void
 959 uo_text (struct ui_out *uiout,
 960          const char *string)
 961 {
 962   if (!uiout->impl->text)
 963     return;
 964   uiout->impl->text (uiout, string);
 965 }
 966
 967 void
 968 uo_message (struct ui_out *uiout, int verbosity,
 969             const char *format,
 970             va_list args)
 971 {
 972   if (!uiout->impl->message)
 973     return;
 974   uiout->impl->message (uiout, verbosity, format, args);
 975 }
 976
 977 void
 978 uo_wrap_hint (struct ui_out *uiout, char *identstring)
 979 {
 980   if (!uiout->impl->wrap_hint)
 981     return;
 982   uiout->impl->wrap_hint (uiout, identstring);
 983 }
 984
 985 void
 986 uo_flush (struct ui_out *uiout)
 987 {
 988   if (!uiout->impl->flush)
 989     return;
 990   uiout->impl->flush (uiout);
 991 }
 992
 993 int
 994 uo_redirect (struct ui_out *uiout, struct ui_file *outstream)
 995 {
 996   if (!uiout->impl->redirect)
 997     return -1;
 998   uiout->impl->redirect (uiout, outstream);
 999   return 0;
1000 }
1001
1002 /* local functions */
1003
1004 /* list of column headers manipulation routines */
1005
1006 static void
1007 clear_header_list (struct ui_out *uiout)
1008 {
1009   while (uiout->table.header_first != NULL)
1010     {
1011       uiout->table.header_next = uiout->table.header_first;
1012       uiout->table.header_first = uiout->table.header_first->next;
1013       if (uiout->table.header_next->colhdr != NULL)
1014         xfree (uiout->table.header_next->colhdr);
1015       xfree (uiout->table.header_next);
1016     }
1017   gdb_assert (uiout->table.header_first == NULL);
1018   uiout->table.header_last = NULL;
1019   uiout->table.header_next = NULL;
1020 }
1021
1022 static void
1023 append_header_to_list (struct ui_out *uiout,
1024                        int width,
1025                        int alignment,
1026                        const char *col_name,
1027                        const char *colhdr)
1028 {
1029   struct ui_out_hdr *temphdr;
1030
1031   temphdr = XMALLOC (struct ui_out_hdr);
1032   temphdr->width = width;
1033   temphdr->alignment = alignment;
1034   /* we have to copy the column title as the original may be an automatic */
1035   if (colhdr != NULL)
1036     temphdr->colhdr = xstrdup (colhdr);
1037   else
1038     temphdr->colhdr = NULL;
1039   if (col_name != NULL)
1040     temphdr->col_name = xstrdup (colhdr);
1041   else
1042     temphdr->col_name = xstrdup (colhdr);
1043   temphdr->next = NULL;
1044   if (uiout->table.header_first == NULL)
1045     {
1046       temphdr->colno = 1;
1047       uiout->table.header_first = temphdr;
1048       uiout->table.header_last = temphdr;
1049     }
1050   else
1051     {
1052       temphdr->colno = uiout->table.header_last->colno + 1;
1053       uiout->table.header_last->next = temphdr;
1054       uiout->table.header_last = temphdr;
1055     }
1056   uiout->table.header_next = uiout->table.header_last;
1057 }
1058
1059 /* Extract the format information for the NEXT header and and advance
1060    the header pointer.  Return 0 if there was no next header.  */
1061
1062 static int
1063 get_next_header (struct ui_out *uiout,
1064                  int *colno,
1065                  int *width,
1066                  int *alignment,
1067                  char **colhdr)
1068 {
1069   /* There may be no headers at all or we may have used all columns.  */
1070   if (uiout->table.header_next == NULL)
1071     return 0;
1072   *colno = uiout->table.header_next->colno;
1073   *width = uiout->table.header_next->width;
1074   *alignment = uiout->table.header_next->alignment;
1075   *colhdr = uiout->table.header_next->colhdr;
1076   /* Advance the header pointer to the next entry.  */
1077   uiout->table.header_next = uiout->table.header_next->next;
1078   return 1;
1079 }
1080
1081
1082 /* Verify that the field/tuple/list is correctly positioned.  Return
1083    the field number and corresponding alignment (if
1084    available/applicable).  */
1085
1086 static void
1087 verify_field (struct ui_out *uiout, int *fldno, int *width, int *align)
1088 {
1089   struct ui_out_level *current = current_level (uiout);
1090   char *text;
1091
1092   if (uiout->table.flag)
1093     {
1094       if (!uiout->table.body_flag)
1095         internal_error (__FILE__, __LINE__,
1096                         _("table_body missing; table fields must be \
1097 specified after table_body and inside a list."));
1098       /* NOTE: cagney/2001-12-08: There was a check here to ensure
1099          that this code was only executed when uiout->level was
1100          greater than zero.  That no longer applies - this code is run
1101          before each table row tuple is started and at that point the
1102          level is zero.  */
1103     }
1104
1105   current->field_count += 1;
1106
1107   if (uiout->table.body_flag
1108       && uiout->table.entry_level == uiout->level
1109       && get_next_header (uiout, fldno, width, align, &text))
1110     {
1111       if (*fldno != current->field_count)
1112         internal_error (__FILE__, __LINE__,
1113                         _("ui-out internal error in handling headers."));
1114     }
1115   else
1116     {
1117       *width = 0;
1118       *align = ui_noalign;
1119       *fldno = current->field_count;
1120     }
1121 }
1122
1123
1124 /* access to ui_out format private members */
1125
1126 void
1127 ui_out_get_field_separator (struct ui_out *uiout)
1128 {
1129 }
1130
1131 /* Access to ui-out members data */
1132
1133 struct ui_out_data *
1134 ui_out_data (struct ui_out *uiout)
1135 {
1136   return uiout->data;
1137 }
1138
1139 /* initalize private members at startup */
1140
1141 struct ui_out *
1142 ui_out_new (struct ui_out_impl *impl,
1143             struct ui_out_data *data,
1144             int flags)
1145 {
1146   struct ui_out *uiout = XMALLOC (struct ui_out);
1147   uiout->data = data;
1148   uiout->impl = impl;
1149   uiout->flags = flags;
1150   uiout->table.flag = 0;
1151   uiout->table.body_flag = 0;
1152   uiout->level = 0;
1153   memset (uiout->levels, 0, sizeof (uiout->levels));
1154   uiout->table.header_first = NULL;
1155   uiout->table.header_last = NULL;
1156   uiout->table.header_next = NULL;
1157   return uiout;
1158 }
1159
1160 /* standard gdb initialization hook */
1161
1162 void
1163 _initialize_ui_out (void)
1164 {
1165   /* nothing needs to be done */
1166 }