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