gdb/ui-out.c

   1 /* Output generating routines for GDB.
   2    Copyright 1999, 2000 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
  29 /* Convenience macro for allocting typesafe memory. */
  30
  31 #undef XMALLOC
  32 #define XMALLOC(TYPE) (TYPE*) xmalloc (sizeof (TYPE))
  33
  34 /* table header structures */
  35
  36 struct ui_out_hdr
  37   {
  38     int colno;
  39     int width;
  40     int alignment;
  41     char *colhdr;
  42     struct ui_out_hdr *next;
  43   };
  44
  45 /* The ui_out structure */
  46 /* Any change here requires a corresponding one in the initialization
  47    of the default uiout, which is statically initialized */
  48
  49 struct ui_out
  50   {
  51     int flags;
  52     /* specific implementation of ui-out */
  53     struct ui_out_impl *impl;
  54     struct ui_out_data *data;
  55
  56     /* if on, a table is being generated */
  57     int table_flag;
  58
  59     /* if on, the body of a table is being generated */
  60     int body_flag;
  61
  62     /* number of table columns (as specified in the table_begin call) */
  63     int table_columns;
  64
  65     /* strinf identifying the table (as specified in the table_begin call) */
  66     char *table_id;
  67
  68     /* if on, a list is being generated.  The value is the level of nesting */
  69     int list_flag;
  70
  71     /* we count each field; the first element is for non-list fields */
  72     int field_count[5];
  73
  74     /* points to the first header (if any) */
  75     struct ui_out_hdr *headerfirst;
  76
  77     /* points to the last header (if any) */
  78     struct ui_out_hdr *headerlast;
  79
  80     /* points to header of next column to format */
  81     struct ui_out_hdr *headercurr;
  82
  83   };
  84
  85 /* These are the default implementation functions */
  86
  87 static void default_table_begin (struct ui_out *uiout, int nbrofcols,
  88                                  char *tblid);
  89 static void default_table_body (struct ui_out *uiout);
  90 static void default_table_end (struct ui_out *uiout);
  91 static void default_table_header (struct ui_out *uiout, int width,
  92                                   enum ui_align alig, char *colhdr);
  93 static void default_list_begin (struct ui_out *uiout, int list_flag,
  94                                 char *lstid);
  95 static void default_list_end (struct ui_out *uiout, int list_flag);
  96 static void default_field_int (struct ui_out *uiout, int fldno, int width,
  97                                enum ui_align alig, char *fldname, int value);
  98 static void default_field_skip (struct ui_out *uiout, int fldno, int width,
  99                                 enum ui_align alig, char *fldname);
 100 static void default_field_string (struct ui_out *uiout, int fldno, int width,
 101                                   enum ui_align align, char *fldname,
 102                                   const char *string);
 103 static void default_field_fmt (struct ui_out *uiout, int fldno,
 104                                int width, enum ui_align align,
 105                                char *fldname, char *format, va_list args);
 106 static void default_spaces (struct ui_out *uiout, int numspaces);
 107 static void default_text (struct ui_out *uiout, char *string);
 108 static void default_message (struct ui_out *uiout, int verbosity, char *format,
 109                              va_list args);
 110 static void default_wrap_hint (struct ui_out *uiout, char *identstring);
 111 static void default_flush (struct ui_out *uiout);
 112
 113 /* This is the default ui-out implementation functions vector */
 114
 115 struct ui_out_impl default_ui_out_impl =
 116 {
 117   default_table_begin,
 118   default_table_body,
 119   default_table_end,
 120   default_table_header,
 121   default_list_begin,
 122   default_list_end,
 123   default_field_int,
 124   default_field_skip,
 125   default_field_string,
 126   default_field_fmt,
 127   default_spaces,
 128   default_text,
 129   default_message,
 130   default_wrap_hint,
 131   default_flush
 132 };
 133
 134 /* The default ui_out */
 135
 136 struct ui_out def_uiout =
 137 {
 138   0,                            /* flags */
 139   &default_ui_out_impl,         /* impl */
 140 };
 141
 142 /* Pointer to current ui_out */
 143 /* FIXME: This should not be a global, but something passed down from main.c
 144    or top.c */
 145
 146 struct ui_out *uiout = &def_uiout;
 147
 148 /* These are the interfaces to implementation functions */
 149
 150 static void uo_table_begin (struct ui_out *uiout, int nbrofcols, char *tblid);
 151 static void uo_table_body (struct ui_out *uiout);
 152 static void uo_table_end (struct ui_out *uiout);
 153 static void uo_table_header (struct ui_out *uiout, int width,
 154                              enum ui_align align, char *colhdr);
 155 static void uo_list_begin (struct ui_out *uiout, int list_flag, char *lstid);
 156 static void uo_list_end (struct ui_out *uiout, int list_flag);
 157 static void uo_field_int (struct ui_out *uiout, int fldno, int width,
 158                           enum ui_align align, char *fldname, int value);
 159 static void uo_field_skip (struct ui_out *uiout, int fldno, int width,
 160                            enum ui_align align, char *fldname);
 161 static void uo_field_string (struct ui_out *uiout, int fldno, int width,
 162                           enum ui_align align, char *fldname, const char *string);
 163 static void uo_field_fmt (struct ui_out *uiout, int fldno, int width,
 164                           enum ui_align align, char *fldname,
 165                           char *format, va_list args);
 166 static void uo_spaces (struct ui_out *uiout, int numspaces);
 167 static void uo_text (struct ui_out *uiout, char *string);
 168 static void uo_message (struct ui_out *uiout, int verbosity,
 169                         char *format, va_list args);
 170 static void uo_wrap_hint (struct ui_out *uiout, char *identstring);
 171 static void uo_flush (struct ui_out *uiout);
 172
 173 /* Prototypes for local functions */
 174
 175 extern void _initialize_ui_out (void);
 176 static void append_header_to_list (struct ui_out *uiout, int width, int alignment, char *colhdr);
 177 static int get_curr_header (struct ui_out *uiout, int *colno, int *width,
 178                             int *alignment, char **colhdr);
 179 static void clear_header_list (struct ui_out *uiout);
 180 static void verify_field_proper_position (struct ui_out *uiout);
 181 static void verify_field_alignment (struct ui_out *uiout, int fldno, int *width, int *alignment);
 182
 183 static void init_ui_out_state (struct ui_out *uiout);
 184
 185 /* exported functions (ui_out API) */
 186
 187 /* Mark beginning of a table */
 188
 189 void
 190 ui_out_table_begin (struct ui_out *uiout, int nbrofcols, char *tblid)
 191 {
 192   if (uiout->table_flag)
 193     internal_error ("gdb/ui_out.c: tables cannot be nested; table_begin found before \
 194 previous table_end.");
 195
 196   uiout->table_flag = 1;
 197   uiout->table_columns = nbrofcols;
 198   if (tblid != NULL)
 199     uiout->table_id = xstrdup (tblid);
 200   else
 201     uiout->table_id = NULL;
 202   clear_header_list (uiout);
 203
 204   uo_table_begin (uiout, nbrofcols, uiout->table_id);
 205 }
 206
 207 void
 208 ui_out_table_body (struct ui_out *uiout)
 209 {
 210   if (!uiout->table_flag)
 211     internal_error ("gdb/ui_out.c: table_body outside a table is not valid; it must be \
 212 after a table_begin and before a table_end.");
 213   if (uiout->body_flag)
 214     internal_error ("gdb/ui_out.c: extra table_body call not allowed; there must be \
 215 only one table_body after a table_begin and before a table_end.");
 216   if (uiout->headercurr->colno != uiout->table_columns)
 217     internal_error ("gdb/ui_out.c: number of headers differ from number of table \
 218 columns.");
 219
 220   uiout->body_flag = 1;
 221   uiout->headercurr = uiout->headerfirst;
 222
 223   uo_table_body (uiout);
 224 }
 225
 226 void
 227 ui_out_table_end (struct ui_out *uiout)
 228 {
 229   if (!uiout->table_flag)
 230     internal_error ("gdb/ui_out.c: misplaced table_end or missing table_begin.");
 231
 232   uiout->body_flag = 0;
 233   uiout->table_flag = 0;
 234
 235   uo_table_end (uiout);
 236
 237   if (uiout->table_id)
 238     free (uiout->table_id);
 239   clear_header_list (uiout);
 240 }
 241
 242 void
 243 ui_out_table_header (struct ui_out *uiout, int width, enum ui_align alignment,
 244                      char *colhdr)
 245 {
 246   if (!uiout->table_flag || uiout->body_flag)
 247     internal_error ("ui_out: table header must be specified after table_begin \
 248 and before table_body.");
 249
 250   append_header_to_list (uiout, width, alignment, colhdr);
 251
 252   uo_table_header (uiout, width, alignment, colhdr);
 253 }
 254
 255 void
 256 ui_out_list_begin (struct ui_out *uiout, char *lstid)
 257 {
 258   if (uiout->table_flag && !uiout->body_flag)
 259     internal_error ("ui_out: table header or table_body expected; lists must be \
 260 specified after table_body.");
 261   if (uiout->list_flag >= 4)
 262     internal_error ("ui_out: list depth exceeded; only 4 levels of lists can be \
 263 nested.");
 264
 265   uiout->list_flag++;
 266   uiout->field_count[uiout->list_flag] = 0;
 267   if (uiout->table_flag && (uiout->list_flag == 1))
 268     uiout->headercurr = uiout->headerfirst;
 269
 270   uo_list_begin (uiout, uiout->list_flag, lstid);
 271 }
 272
 273 void
 274 ui_out_list_end (struct ui_out *uiout)
 275 {
 276   if (!uiout->list_flag)
 277     internal_error ("ui_out: misplaced list_end; there is no list to be closed.");
 278
 279   uo_list_end (uiout, uiout->list_flag);
 280
 281   uiout->list_flag--;
 282 }
 283
 284 void
 285 ui_out_field_int (struct ui_out *uiout, char *fldname, int value)
 286 {
 287   int fldno;
 288   int width;
 289   int align;
 290
 291   verify_field_proper_position (uiout);
 292
 293   uiout->field_count[uiout->list_flag] += 1;
 294   fldno = uiout->field_count[uiout->list_flag];
 295
 296   verify_field_alignment (uiout, fldno, &width, &align);
 297
 298   uo_field_int (uiout, fldno, width, align, fldname, value);
 299 }
 300
 301 void
 302 ui_out_field_core_addr (struct ui_out *uiout, char *fldname, CORE_ADDR address)
 303 {
 304   char addstr[20];
 305
 306   /* FIXME-32x64: need a print_address_numeric with field width */
 307   /* print_address_numeric (address, 1, local_stream); */
 308   strcpy (addstr, local_hex_string_custom ((unsigned long) address, "08l"));
 309
 310   ui_out_field_string (uiout, fldname, addstr);
 311 }
 312
 313 void
 314 ui_out_field_stream (struct ui_out *uiout, char *fldname, struct ui_stream *buf)
 315 {
 316   long length;
 317   char *buffer = ui_file_xstrdup (buf->stream, &length);
 318   struct cleanup *old_cleanup = make_cleanup (free, buffer);
 319   if (length > 0)
 320     ui_out_field_string (uiout, fldname, buffer);
 321   else
 322     ui_out_field_skip (uiout, fldname);
 323   ui_file_rewind (buf->stream);
 324   do_cleanups (old_cleanup);
 325 }
 326
 327 /* used to ommit a field */
 328
 329 void
 330 ui_out_field_skip (struct ui_out *uiout, char *fldname)
 331 {
 332   int fldno;
 333   int width;
 334   int align;
 335
 336   verify_field_proper_position (uiout);
 337
 338   uiout->field_count[uiout->list_flag] += 1;
 339   fldno = uiout->field_count[uiout->list_flag];
 340
 341   verify_field_alignment (uiout, fldno, &width, &align);
 342
 343   uo_field_skip (uiout, fldno, width, align, fldname);
 344 }
 345
 346 void
 347 ui_out_field_string (struct ui_out *uiout,
 348                      char *fldname,
 349                      const char *string)
 350 {
 351   int fldno;
 352   int width;
 353   int align;
 354
 355   verify_field_proper_position (uiout);
 356
 357   uiout->field_count[uiout->list_flag] += 1;
 358   fldno = uiout->field_count[uiout->list_flag];
 359
 360   verify_field_alignment (uiout, fldno, &width, &align);
 361
 362   uo_field_string (uiout, fldno, width, align, fldname, string);
 363 }
 364
 365 /* VARARGS */
 366 void
 367 ui_out_field_fmt (struct ui_out *uiout, char *fldname, char *format,...)
 368 {
 369   va_list args;
 370   int fldno;
 371   int width;
 372   int align;
 373
 374   verify_field_proper_position (uiout);
 375
 376   uiout->field_count[uiout->list_flag] += 1;
 377   fldno = uiout->field_count[uiout->list_flag];
 378
 379   /* will not align, but has to call anyway */
 380   verify_field_alignment (uiout, fldno, &width, &align);
 381
 382   va_start (args, format);
 383
 384   uo_field_fmt (uiout, fldno, width, align, fldname, format, args);
 385
 386   va_end (args);
 387 }
 388
 389 void
 390 ui_out_spaces (struct ui_out *uiout, int numspaces)
 391 {
 392   uo_spaces (uiout, numspaces);
 393 }
 394
 395 void
 396 ui_out_text (struct ui_out *uiout, char *string)
 397 {
 398   uo_text (uiout, string);
 399 }
 400
 401 void
 402 ui_out_message (struct ui_out *uiout, int verbosity, char *format,...)
 403 {
 404   va_list args;
 405
 406   va_start (args, format);
 407
 408   uo_message (uiout, verbosity, format, args);
 409
 410   va_end (args);
 411 }
 412
 413 struct ui_stream *
 414 ui_out_stream_new (struct ui_out *uiout)
 415 {
 416   struct ui_stream *tempbuf;
 417
 418   tempbuf = XMALLOC (struct ui_stream);
 419   tempbuf->uiout = uiout;
 420   tempbuf->stream = mem_fileopen ();
 421   return tempbuf;
 422 }
 423
 424 void
 425 ui_out_stream_delete (struct ui_stream *buf)
 426 {
 427   ui_file_delete (buf->stream);
 428   free (buf);
 429 }
 430
 431 static void
 432 do_stream_delete (void *buf)
 433 {
 434   ui_out_stream_delete (buf);
 435 }
 436
 437 struct cleanup *
 438 make_cleanup_ui_out_stream_delete (struct ui_stream *buf)
 439 {
 440   return make_cleanup (do_stream_delete, buf);
 441 }
 442
 443
 444 void
 445 ui_out_wrap_hint (struct ui_out *uiout, char *identstring)
 446 {
 447   uo_wrap_hint (uiout, identstring);
 448 }
 449
 450 void
 451 ui_out_flush (struct ui_out *uiout)
 452 {
 453   uo_flush (uiout);
 454 }
 455
 456 /* set the flags specified by the mask given */
 457 int
 458 ui_out_set_flags (struct ui_out *uiout, int mask)
 459 {
 460   int oldflags = uiout->flags;
 461
 462   uiout->flags |= mask;
 463
 464   return oldflags;
 465 }
 466
 467 /* clear the flags specified by the mask given */
 468 int
 469 ui_out_clear_flags (struct ui_out *uiout, int mask)
 470 {
 471   int oldflags = uiout->flags;
 472
 473   uiout->flags &= ~mask;
 474
 475   return oldflags;
 476 }
 477
 478 /* test the flags against the mask given */
 479 int
 480 ui_out_test_flags (struct ui_out *uiout, int mask)
 481 {
 482   return (uiout->flags & mask);
 483 }
 484
 485 /* obtain the current verbosity level (as stablished by the
 486    'set verbositylevel' command */
 487
 488 int
 489 ui_out_get_verblvl (struct ui_out *uiout)
 490 {
 491   /* FIXME: not implemented yet */
 492   return 0;
 493 }
 494
 495 #if 0
 496 void
 497 ui_out_result_begin (struct ui_out *uiout, char *class)
 498 {
 499 }
 500
 501 void
 502 ui_out_result_end (struct ui_out *uiout)
 503 {
 504 }
 505
 506 void
 507 ui_out_info_begin (struct ui_out *uiout, char *class)
 508 {
 509 }
 510
 511 void
 512 ui_out_info_end (struct ui_out *uiout)
 513 {
 514 }
 515
 516 void
 517 ui_out_notify_begin (struct ui_out *uiout, char *class)
 518 {
 519 }
 520
 521 void
 522 ui_out_notify_end (struct ui_out *uiout)
 523 {
 524 }
 525
 526 void
 527 ui_out_error_begin (struct ui_out *uiout, char *class)
 528 {
 529 }
 530
 531 void
 532 ui_out_error_end (struct ui_out *uiout)
 533 {
 534 }
 535 #endif
 536
 537 #if 0
 538 void
 539 gdb_error (ui_out * uiout, int severity, char *format,...)
 540 {
 541   va_list args;
 542 }
 543
 544 void
 545 gdb_query (uiout, qflags, qprompt)
 546      struct ui_out *uiout;
 547      int flags;
 548      char *qprompt;
 549 {
 550 }
 551 #endif
 552
 553 /* default gdb-out hook functions */
 554
 555 static void
 556 default_table_begin (struct ui_out *uiout, int nbrofcols, char *tblid)
 557 {
 558 }
 559
 560 static void
 561 default_table_body (struct ui_out *uiout)
 562 {
 563 }
 564
 565 static void
 566 default_table_end (struct ui_out *uiout)
 567 {
 568 }
 569
 570 static void
 571 default_table_header (struct ui_out *uiout, int width, enum ui_align alignment,
 572                       char *colhdr)
 573 {
 574 }
 575
 576 static void
 577 default_list_begin (struct ui_out *uiout, int list_flag, char *lstid)
 578 {
 579 }
 580
 581 static void
 582 default_list_end (struct ui_out *uiout, int list_flag)
 583 {
 584 }
 585
 586 static void
 587 default_field_int (struct ui_out *uiout, int fldno, int width,
 588                    enum ui_align align, char *fldname, int value)
 589 {
 590 }
 591
 592 static void
 593 default_field_skip (struct ui_out *uiout, int fldno, int width,
 594                     enum ui_align align, char *fldname)
 595 {
 596 }
 597
 598 static void
 599 default_field_string (struct ui_out *uiout,
 600                       int fldno,
 601                       int width,
 602                       enum ui_align align,
 603                       char *fldname,
 604                       const char *string)
 605 {
 606 }
 607
 608 static void
 609 default_field_fmt (struct ui_out *uiout, int fldno, int width,
 610                    enum ui_align align, char *fldname, char *format,
 611                    va_list args)
 612 {
 613 }
 614
 615 static void
 616 default_spaces (struct ui_out *uiout, int numspaces)
 617 {
 618 }
 619
 620 static void
 621 default_text (struct ui_out *uiout, char *string)
 622 {
 623 }
 624
 625 static void
 626 default_message (struct ui_out *uiout, int verbosity, char *format,
 627                  va_list args)
 628 {
 629 }
 630
 631 static void
 632 default_wrap_hint (struct ui_out *uiout, char *identstring)
 633 {
 634 }
 635
 636 static void
 637 default_flush (struct ui_out *uiout)
 638 {
 639 }
 640
 641 /* Interface to the implementation functions */
 642
 643 void
 644 uo_table_begin (struct ui_out *uiout, int nbrofcols, char *tblid)
 645 {
 646   if (!uiout->impl->table_begin)
 647     return;
 648   uiout->impl->table_begin (uiout, nbrofcols, tblid);
 649 }
 650
 651 void
 652 uo_table_body (struct ui_out *uiout)
 653 {
 654   if (!uiout->impl->table_body)
 655     return;
 656   uiout->impl->table_body (uiout);
 657 }
 658
 659 void
 660 uo_table_end (struct ui_out *uiout)
 661 {
 662   if (!uiout->impl->table_end)
 663     return;
 664   uiout->impl->table_end (uiout);
 665 }
 666
 667 void
 668 uo_table_header (struct ui_out *uiout, int width, enum ui_align align, char *colhdr)
 669 {
 670   if (!uiout->impl->table_header)
 671     return;
 672   uiout->impl->table_header (uiout, width, align, colhdr);
 673 }
 674
 675 void
 676 uo_list_begin (struct ui_out *uiout, int list_flag, char *lstid)
 677 {
 678   if (!uiout->impl->list_begin)
 679     return;
 680   uiout->impl->list_begin (uiout, list_flag, lstid);
 681 }
 682
 683 void
 684 uo_list_end (struct ui_out *uiout, int list_flag)
 685 {
 686   if (!uiout->impl->list_end)
 687     return;
 688   uiout->impl->list_end (uiout, list_flag);
 689 }
 690
 691 void
 692 uo_field_int (struct ui_out *uiout, int fldno, int width, enum ui_align align, char *fldname, int value)
 693 {
 694   if (!uiout->impl->field_int)
 695     return;
 696   uiout->impl->field_int (uiout, fldno, width, align, fldname, value);
 697 }
 698
 699 void
 700 uo_field_skip (struct ui_out *uiout, int fldno, int width, enum ui_align align, char *fldname)
 701 {
 702   if (!uiout->impl->field_skip)
 703     return;
 704   uiout->impl->field_skip (uiout, fldno, width, align, fldname);
 705 }
 706
 707 void
 708 uo_field_string (struct ui_out *uiout, int fldno, int width,
 709                  enum ui_align align, char *fldname, const char *string)
 710 {
 711   if (!uiout->impl->field_string)
 712     return;
 713   uiout->impl->field_string (uiout, fldno, width, align, fldname, string);
 714 }
 715
 716 void
 717 uo_field_fmt (struct ui_out *uiout, int fldno, int width, enum ui_align align, char *fldname, char *format, va_list args)
 718 {
 719   if (!uiout->impl->field_fmt)
 720     return;
 721   uiout->impl->field_fmt (uiout, fldno, width, align, fldname, format, args);
 722 }
 723
 724 void
 725 uo_spaces (struct ui_out *uiout, int numspaces)
 726 {
 727   if (!uiout->impl->spaces)
 728     return;
 729   uiout->impl->spaces (uiout, numspaces);
 730 }
 731
 732 void
 733 uo_text (struct ui_out *uiout, char *string)
 734 {
 735   if (!uiout->impl->text)
 736     return;
 737   uiout->impl->text (uiout, string);
 738 }
 739
 740 void
 741 uo_message (struct ui_out *uiout, int verbosity, char *format, va_list args)
 742 {
 743   if (!uiout->impl->message)
 744     return;
 745   uiout->impl->message (uiout, verbosity, format, args);
 746 }
 747
 748 void
 749 uo_wrap_hint (struct ui_out *uiout, char *identstring)
 750 {
 751   if (!uiout->impl->wrap_hint)
 752     return;
 753   uiout->impl->wrap_hint (uiout, identstring);
 754 }
 755
 756 void
 757 uo_flush (struct ui_out *uiout)
 758 {
 759   if (!uiout->impl->flush)
 760     return;
 761   uiout->impl->flush (uiout);
 762 }
 763
 764 /* local functions */
 765
 766 /* list of column headers manipulation routines */
 767
 768 static void
 769 clear_header_list (struct ui_out *uiout)
 770 {
 771   while (uiout->headerfirst != NULL)
 772     {
 773       uiout->headercurr = uiout->headerfirst;
 774       uiout->headerfirst = uiout->headerfirst->next;
 775       if (uiout->headercurr->colhdr != NULL)
 776         free (uiout->headercurr->colhdr);
 777       free (uiout->headercurr);
 778     }
 779   uiout->headerlast = NULL;
 780   uiout->headercurr = NULL;
 781 }
 782
 783 static void
 784 append_header_to_list (struct ui_out *uiout,
 785                        int width,
 786                        int alignment,
 787                        char *colhdr)
 788 {
 789   struct ui_out_hdr *temphdr;
 790
 791   temphdr = XMALLOC (struct ui_out_hdr);
 792   temphdr->width = width;
 793   temphdr->alignment = alignment;
 794   /* we have to copy the column title as the original may be an automatic */
 795   if (colhdr != NULL)
 796     {
 797       temphdr->colhdr = xmalloc (strlen (colhdr) + 1);
 798       strcpy (temphdr->colhdr, colhdr);
 799     }
 800   temphdr->next = NULL;
 801   if (uiout->headerfirst == NULL)
 802     {
 803       temphdr->colno = 1;
 804       uiout->headerfirst = temphdr;
 805       uiout->headerlast = temphdr;
 806     }
 807   else
 808     {
 809       temphdr->colno = uiout->headerlast->colno + 1;
 810       uiout->headerlast->next = temphdr;
 811       uiout->headerlast = temphdr;
 812     }
 813   uiout->headercurr = uiout->headerlast;
 814 }
 815
 816 /* returns 0 if there is no more headers */
 817
 818 static int
 819 get_curr_header (struct ui_out *uiout,
 820                  int *colno,
 821                  int *width,
 822                  int *alignment,
 823                  char **colhdr)
 824 {
 825   /* There may be no headers at all or we may have used all columns */
 826   if (uiout->headercurr == NULL)
 827     return 0;
 828   *colno = uiout->headercurr->colno;
 829   *width = uiout->headercurr->width;
 830   *alignment = uiout->headercurr->alignment;
 831   *colhdr = uiout->headercurr->colhdr;
 832   uiout->headercurr = uiout->headercurr->next;
 833   return 1;
 834 }
 835
 836 /* makes sure the field_* calls were properly placed */
 837
 838 static void
 839 verify_field_proper_position (struct ui_out *uiout)
 840 {
 841   if (uiout->table_flag)
 842     {
 843       if (!uiout->body_flag)
 844         internal_error ("ui_out: table_body missing; table fields must be \
 845 specified after table_body and inside a list.");
 846       if (!uiout->list_flag)
 847         internal_error ("ui_out: list_begin missing; table fields must be \
 848 specified after table_body and inside a list.");
 849     }
 850 }
 851
 852 /* determines what is the alignment policy */
 853
 854 static void
 855 verify_field_alignment (struct ui_out *uiout,
 856                         int fldno,
 857                         int *width,
 858                         int *align)
 859 {
 860   int colno;
 861   char *text;
 862
 863   if (uiout->table_flag
 864       && get_curr_header (uiout, &colno, width, align, &text))
 865     {
 866       if (fldno != colno)
 867         internal_error ("gdb/ui-out.c: ui-out internal error in handling headers.");
 868     }
 869   else
 870     {
 871       *width = 0;
 872       *align = ui_noalign;
 873     }
 874 }
 875
 876 /* access to ui_out format private members */
 877
 878 void
 879 ui_out_get_field_separator (struct ui_out *uiout)
 880 {
 881 }
 882
 883 /* Access to ui-out members data */
 884
 885 struct ui_out_data *
 886 ui_out_data (struct ui_out *uiout)
 887 {
 888   return uiout->data;
 889 }
 890
 891 /* initalize private members at startup */
 892
 893 struct ui_out *
 894 ui_out_new (struct ui_out_impl *impl,
 895             struct ui_out_data *data,
 896             int flags)
 897 {
 898   struct ui_out *uiout = XMALLOC (struct ui_out);
 899   uiout->data = data;
 900   uiout->impl = impl;
 901   uiout->flags = flags;
 902   uiout->table_flag = 0;
 903   uiout->body_flag = 0;
 904   uiout->list_flag = 0;
 905   uiout->field_count[0] = 0;
 906   uiout->headerfirst = NULL;
 907   uiout->headerlast = NULL;
 908   uiout->headercurr = NULL;
 909   return uiout;
 910 }
 911
 912 /* standard gdb initialization hook */
 913
 914 void
 915 _initialize_ui_out (void)
 916 {
 917   /* nothing needs to be done */
 918 }