gdb/cli-out.c

   1 /* Output generating routines for GDB CLI.
   2
   3    Copyright (C) 1999-2022 Free Software Foundation, Inc.
   4
   5    Contributed by Cygnus Solutions.
   6    Written by Fernando Nasser for Cygnus.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #include "defs.h"
  24 #include "ui-out.h"
  25 #include "cli-out.h"
  26 #include "completer.h"
  27 #include "readline/readline.h"
  28 #include "cli/cli-style.h"
  29
  30 /* These are the CLI output functions */
  31
  32 /* Mark beginning of a table */
  33
  34 void
  35 cli_ui_out::do_table_begin (int nbrofcols, int nr_rows, const char *tblid)
  36 {
  37   if (nr_rows == 0)
  38     m_suppress_output = true;
  39   else
  40     /* Only the table suppresses the output and, fortunately, a table
  41        is not a recursive data structure.  */
  42     gdb_assert (!m_suppress_output);
  43 }
  44
  45 /* Mark beginning of a table body */
  46
  47 void
  48 cli_ui_out::do_table_body ()
  49 {
  50   if (m_suppress_output)
  51     return;
  52
  53   /* first, close the table header line */
  54   text ("\n");
  55 }
  56
  57 /* Mark end of a table */
  58
  59 void
  60 cli_ui_out::do_table_end ()
  61 {
  62   m_suppress_output = false;
  63 }
  64
  65 /* Specify table header */
  66
  67 void
  68 cli_ui_out::do_table_header (int width, ui_align alignment,
  69                              const std::string &col_name,
  70                              const std::string &col_hdr)
  71 {
  72   if (m_suppress_output)
  73     return;
  74
  75   do_field_string (0, width, alignment, 0, col_hdr.c_str (),
  76                    ui_file_style ());
  77 }
  78
  79 /* Mark beginning of a list */
  80
  81 void
  82 cli_ui_out::do_begin (ui_out_type type, const char *id)
  83 {
  84 }
  85
  86 /* Mark end of a list */
  87
  88 void
  89 cli_ui_out::do_end (ui_out_type type)
  90 {
  91 }
  92
  93 /* output an int field */
  94
  95 void
  96 cli_ui_out::do_field_signed (int fldno, int width, ui_align alignment,
  97                              const char *fldname, LONGEST value)
  98 {
  99   if (m_suppress_output)
 100     return;
 101
 102   do_field_string (fldno, width, alignment, fldname, plongest (value),
 103                    ui_file_style ());
 104 }
 105
 106 /* output an unsigned field */
 107
 108 void
 109 cli_ui_out::do_field_unsigned (int fldno, int width, ui_align alignment,
 110                                const char *fldname, ULONGEST value)
 111 {
 112   if (m_suppress_output)
 113     return;
 114
 115   do_field_string (fldno, width, alignment, fldname, pulongest (value),
 116                    ui_file_style ());
 117 }
 118
 119 /* used to omit a field */
 120
 121 void
 122 cli_ui_out::do_field_skip (int fldno, int width, ui_align alignment,
 123                            const char *fldname)
 124 {
 125   if (m_suppress_output)
 126     return;
 127
 128   do_field_string (fldno, width, alignment, fldname, "",
 129                    ui_file_style ());
 130 }
 131
 132 /* other specific cli_field_* end up here so alignment and field
 133    separators are both handled by cli_field_string */
 134
 135 void
 136 cli_ui_out::do_field_string (int fldno, int width, ui_align align,
 137                              const char *fldname, const char *string,
 138                              const ui_file_style &style)
 139 {
 140   int before = 0;
 141   int after = 0;
 142
 143   if (m_suppress_output)
 144     return;
 145
 146   if ((align != ui_noalign) && string)
 147     {
 148       before = width - strlen (string);
 149       if (before <= 0)
 150         before = 0;
 151       else
 152         {
 153           if (align == ui_right)
 154             after = 0;
 155           else if (align == ui_left)
 156             {
 157               after = before;
 158               before = 0;
 159             }
 160           else
 161             /* ui_center */
 162             {
 163               after = before / 2;
 164               before -= after;
 165             }
 166         }
 167     }
 168
 169   if (before)
 170     spaces (before);
 171
 172   if (string)
 173     {
 174       if (test_flags (unfiltered_output))
 175         fputs_styled_unfiltered (string, style, m_streams.back ());
 176       else
 177         fputs_styled (string, style, m_streams.back ());
 178     }
 179
 180   if (after)
 181     spaces (after);
 182
 183   if (align != ui_noalign)
 184     field_separator ();
 185 }
 186
 187 /* Output field containing ARGS using printf formatting in FORMAT.  */
 188
 189 void
 190 cli_ui_out::do_field_fmt (int fldno, int width, ui_align align,
 191                           const char *fldname, const ui_file_style &style,
 192                           const char *format, va_list args)
 193 {
 194   if (m_suppress_output)
 195     return;
 196
 197   std::string str = string_vprintf (format, args);
 198
 199   do_field_string (fldno, width, align, fldname, str.c_str (), style);
 200 }
 201
 202 void
 203 cli_ui_out::do_spaces (int numspaces)
 204 {
 205   if (m_suppress_output)
 206     return;
 207
 208   if (test_flags (unfiltered_output))
 209     print_spaces (numspaces, m_streams.back ());
 210   else
 211     print_spaces_filtered (numspaces, m_streams.back ());
 212 }
 213
 214 void
 215 cli_ui_out::do_text (const char *string)
 216 {
 217   if (m_suppress_output)
 218     return;
 219
 220   if (test_flags (unfiltered_output))
 221     fputs_unfiltered (string, m_streams.back ());
 222   else
 223     fputs_filtered (string, m_streams.back ());
 224 }
 225
 226 void
 227 cli_ui_out::do_message (const ui_file_style &style,
 228                         const char *format, va_list args)
 229 {
 230   if (m_suppress_output)
 231     return;
 232
 233   /* Use the "no_gdbfmt" variant here to avoid recursion.
 234      vfprintf_styled calls into cli_ui_out::message to handle the
 235      gdb-specific printf formats.  */
 236   vfprintf_styled_no_gdbfmt (m_streams.back (), style,
 237                              !test_flags (unfiltered_output), format, args);
 238 }
 239
 240 void
 241 cli_ui_out::do_wrap_hint (const char *identstring)
 242 {
 243   if (m_suppress_output)
 244     return;
 245
 246   wrap_here (identstring);
 247 }
 248
 249 void
 250 cli_ui_out::do_flush ()
 251 {
 252   gdb_flush (m_streams.back ());
 253 }
 254
 255 /* OUTSTREAM as non-NULL will push OUTSTREAM on the stack of output streams
 256    and make it therefore active.  OUTSTREAM as NULL will pop the last pushed
 257    output stream; it is an internal error if it does not exist.  */
 258
 259 void
 260 cli_ui_out::do_redirect (ui_file *outstream)
 261 {
 262   if (outstream != NULL)
 263     m_streams.push_back (outstream);
 264   else
 265     m_streams.pop_back ();
 266 }
 267
 268 /* The cli_ui_out::do_progress_* functions result in the following:
 269    - printed for tty, SHOULD_PRINT == true:
 270      <NAME
 271       [#####                      ]\r>
 272    - printed for tty, SHOULD_PRINT == false:
 273      <>
 274    - printed for not-a-tty:
 275      <NAME...
 276      >
 277 */
 278
 279 void
 280 cli_ui_out::do_progress_start (const std::string &name, bool should_print)
 281 {
 282   struct ui_file *stream = m_streams.back ();
 283   cli_progress_info meter;
 284
 285   meter.last_value = 0;
 286   meter.name = name;
 287   if (!stream->isatty ())
 288     {
 289       fprintf_unfiltered (stream, "%s...", meter.name.c_str ());
 290       gdb_flush (stream);
 291       meter.printing = WORKING;
 292     }
 293   else
 294     {
 295       /* Don't actually emit anything until the first call notifies us
 296          of progress.  This makes it so a second progress message can
 297          be started before the first one has been notified, without
 298          messy output.  */
 299       meter.printing = should_print ? START : NO_PRINT;
 300     }
 301
 302   m_meters.push_back (std::move (meter));
 303 }
 304
 305 void
 306 cli_ui_out::do_progress_notify (double howmuch)
 307 {
 308   struct ui_file *stream = m_streams.back ();
 309   cli_progress_info &meter (m_meters.back ());
 310
 311   if (meter.printing == NO_PRINT)
 312     return;
 313
 314   if (meter.printing == START)
 315     {
 316       fprintf_unfiltered (stream, "%s\n", meter.name.c_str ());
 317       gdb_flush (stream);
 318       meter.printing = WORKING;
 319     }
 320
 321   if (meter.printing == WORKING && howmuch >= 1.0)
 322     return;
 323
 324   if (!stream->isatty ())
 325     return;
 326
 327   int chars_per_line = get_chars_per_line ();
 328   if (chars_per_line > 0)
 329     {
 330       int i, max;
 331       int width = chars_per_line - 3;
 332
 333       max = width * howmuch;
 334       fprintf_unfiltered (stream, "\r[");
 335       for (i = 0; i < width; ++i)
 336         fprintf_unfiltered (stream, i < max ? "#" : " ");
 337       fprintf_unfiltered (stream, "]");
 338       gdb_flush (stream);
 339       meter.printing = PROGRESS;
 340     }
 341 }
 342
 343 void
 344 cli_ui_out::do_progress_end ()
 345 {
 346   struct ui_file *stream = m_streams.back ();
 347   cli_progress_info &meter = m_meters.back ();
 348
 349   if (!stream->isatty ())
 350     {
 351       fprintf_unfiltered (stream, "\n");
 352       gdb_flush (stream);
 353     }
 354   else if (meter.printing == PROGRESS)
 355     {
 356       int i;
 357       int width = get_chars_per_line () - 3;
 358
 359       fprintf_unfiltered (stream, "\r");
 360       for (i = 0; i < width + 2; ++i)
 361         fprintf_unfiltered (stream, " ");
 362       fprintf_unfiltered (stream, "\r");
 363       gdb_flush (stream);
 364     }
 365
 366   m_meters.pop_back ();
 367 }
 368
 369 /* local functions */
 370
 371 void
 372 cli_ui_out::field_separator ()
 373 {
 374   if (test_flags (unfiltered_output))
 375     fputc_unfiltered (' ', m_streams.back ());
 376   else
 377     fputc_filtered (' ', m_streams.back ());
 378 }
 379
 380 /* Constructor for cli_ui_out.  */
 381
 382 cli_ui_out::cli_ui_out (ui_file *stream, ui_out_flags flags)
 383 : ui_out (flags),
 384   m_suppress_output (false)
 385 {
 386   gdb_assert (stream != NULL);
 387
 388   m_streams.push_back (stream);
 389 }
 390
 391 cli_ui_out::~cli_ui_out ()
 392 {
 393 }
 394
 395 /* Initialize private members at startup.  */
 396
 397 cli_ui_out *
 398 cli_out_new (struct ui_file *stream)
 399 {
 400   return new cli_ui_out (stream, ui_source_list);
 401 }
 402
 403 ui_file *
 404 cli_ui_out::set_stream (struct ui_file *stream)
 405 {
 406   ui_file *old;
 407
 408   old = m_streams.back ();
 409   m_streams.back () = stream;
 410
 411   return old;
 412 }
 413
 414 bool
 415 cli_ui_out::can_emit_style_escape () const
 416 {
 417   return m_streams.back ()->can_emit_style_escape ();
 418 }
 419
 420 /* CLI interface to display tab-completion matches.  */
 421
 422 /* CLI version of displayer.crlf.  */
 423
 424 static void
 425 cli_mld_crlf (const struct match_list_displayer *displayer)
 426 {
 427   rl_crlf ();
 428 }
 429
 430 /* CLI version of displayer.putch.  */
 431
 432 static void
 433 cli_mld_putch (const struct match_list_displayer *displayer, int ch)
 434 {
 435   putc (ch, rl_outstream);
 436 }
 437
 438 /* CLI version of displayer.puts.  */
 439
 440 static void
 441 cli_mld_puts (const struct match_list_displayer *displayer, const char *s)
 442 {
 443   fputs (s, rl_outstream);
 444 }
 445
 446 /* CLI version of displayer.flush.  */
 447
 448 static void
 449 cli_mld_flush (const struct match_list_displayer *displayer)
 450 {
 451   fflush (rl_outstream);
 452 }
 453
 454 EXTERN_C void _rl_erase_entire_line (void);
 455
 456 /* CLI version of displayer.erase_entire_line.  */
 457
 458 static void
 459 cli_mld_erase_entire_line (const struct match_list_displayer *displayer)
 460 {
 461   _rl_erase_entire_line ();
 462 }
 463
 464 /* CLI version of displayer.beep.  */
 465
 466 static void
 467 cli_mld_beep (const struct match_list_displayer *displayer)
 468 {
 469   rl_ding ();
 470 }
 471
 472 /* CLI version of displayer.read_key.  */
 473
 474 static int
 475 cli_mld_read_key (const struct match_list_displayer *displayer)
 476 {
 477   return rl_read_key ();
 478 }
 479
 480 /* CLI version of rl_completion_display_matches_hook.
 481    See gdb_display_match_list for a description of the arguments.  */
 482
 483 void
 484 cli_display_match_list (char **matches, int len, int max)
 485 {
 486   struct match_list_displayer displayer;
 487
 488   rl_get_screen_size (&displayer.height, &displayer.width);
 489   displayer.crlf = cli_mld_crlf;
 490   displayer.putch = cli_mld_putch;
 491   displayer.puts = cli_mld_puts;
 492   displayer.flush = cli_mld_flush;
 493   displayer.erase_entire_line = cli_mld_erase_entire_line;
 494   displayer.beep = cli_mld_beep;
 495   displayer.read_key = cli_mld_read_key;
 496
 497   gdb_display_match_list (matches, len, max, &displayer);
 498   rl_forced_update_display ();
 499 }