gdb/cli-out.c

   1 /* Output generating routines for GDB CLI.
   2
   3    Copyright (C) 1999-2017 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
  29 /* These are the CLI output functions */
  30
  31 /* Mark beginning of a table */
  32
  33 void
  34 cli_ui_out::do_table_begin (int nbrofcols, int nr_rows, const char *tblid)
  35 {
  36   if (nr_rows == 0)
  37     m_suppress_output = true;
  38   else
  39     /* Only the table suppresses the output and, fortunately, a table
  40        is not a recursive data structure.  */
  41     gdb_assert (!m_suppress_output);
  42 }
  43
  44 /* Mark beginning of a table body */
  45
  46 void
  47 cli_ui_out::do_table_body ()
  48 {
  49   if (m_suppress_output)
  50     return;
  51
  52   /* first, close the table header line */
  53   text ("\n");
  54 }
  55
  56 /* Mark end of a table */
  57
  58 void
  59 cli_ui_out::do_table_end ()
  60 {
  61   m_suppress_output = false;
  62 }
  63
  64 /* Specify table header */
  65
  66 void
  67 cli_ui_out::do_table_header (int width, ui_align alignment,
  68                              const std::string &col_name,
  69                              const std::string &col_hdr)
  70 {
  71   if (m_suppress_output)
  72     return;
  73
  74   do_field_string (0, width, alignment, 0, col_hdr.c_str ());
  75 }
  76
  77 /* Mark beginning of a list */
  78
  79 void
  80 cli_ui_out::do_begin (ui_out_type type, const char *id)
  81 {
  82 }
  83
  84 /* Mark end of a list */
  85
  86 void
  87 cli_ui_out::do_end (ui_out_type type)
  88 {
  89 }
  90
  91 /* output an int field */
  92
  93 void
  94 cli_ui_out::do_field_int (int fldno, int width, ui_align alignment,
  95                           const char *fldname, int value)
  96 {
  97   char buffer[20];      /* FIXME: how many chars long a %d can become? */
  98
  99   if (m_suppress_output)
 100     return;
 101
 102   xsnprintf (buffer, sizeof (buffer), "%d", value);
 103
 104   do_field_string (fldno, width, alignment, fldname, buffer);
 105 }
 106
 107 /* used to omit a field */
 108
 109 void
 110 cli_ui_out::do_field_skip (int fldno, int width, ui_align alignment,
 111                            const char *fldname)
 112 {
 113   if (m_suppress_output)
 114     return;
 115
 116   do_field_string (fldno, width, alignment, fldname, "");
 117 }
 118
 119 /* other specific cli_field_* end up here so alignment and field
 120    separators are both handled by cli_field_string */
 121
 122 void
 123 cli_ui_out::do_field_string (int fldno, int width, ui_align align,
 124                              const char *fldname, const char *string)
 125 {
 126   int before = 0;
 127   int after = 0;
 128
 129   if (m_suppress_output)
 130     return;
 131
 132   if ((align != ui_noalign) && string)
 133     {
 134       before = width - strlen (string);
 135       if (before <= 0)
 136         before = 0;
 137       else
 138         {
 139           if (align == ui_right)
 140             after = 0;
 141           else if (align == ui_left)
 142             {
 143               after = before;
 144               before = 0;
 145             }
 146           else
 147             /* ui_center */
 148             {
 149               after = before / 2;
 150               before -= after;
 151             }
 152         }
 153     }
 154
 155   if (before)
 156     spaces (before);
 157
 158   if (string)
 159     out_field_fmt (fldno, fldname, "%s", string);
 160
 161   if (after)
 162     spaces (after);
 163
 164   if (align != ui_noalign)
 165     field_separator ();
 166 }
 167
 168 /* This is the only field function that does not align.  */
 169
 170 void
 171 cli_ui_out::do_field_fmt (int fldno, int width, ui_align align,
 172                           const char *fldname, const char *format,
 173                           va_list args)
 174 {
 175   if (m_suppress_output)
 176     return;
 177
 178   vfprintf_filtered (m_streams.back (), format, args);
 179
 180   if (align != ui_noalign)
 181     field_separator ();
 182 }
 183
 184 void
 185 cli_ui_out::do_spaces (int numspaces)
 186 {
 187   if (m_suppress_output)
 188     return;
 189
 190   print_spaces_filtered (numspaces, m_streams.back ());
 191 }
 192
 193 void
 194 cli_ui_out::do_text (const char *string)
 195 {
 196   if (m_suppress_output)
 197     return;
 198
 199   fputs_filtered (string, m_streams.back ());
 200 }
 201
 202 void
 203 cli_ui_out::do_message (const char *format, va_list args)
 204 {
 205   if (m_suppress_output)
 206     return;
 207
 208   vfprintf_unfiltered (m_streams.back (), format, args);
 209 }
 210
 211 void
 212 cli_ui_out::do_wrap_hint (const char *identstring)
 213 {
 214   if (m_suppress_output)
 215     return;
 216
 217   wrap_here (identstring);
 218 }
 219
 220 void
 221 cli_ui_out::do_flush ()
 222 {
 223   gdb_flush (m_streams.back ());
 224 }
 225
 226 /* OUTSTREAM as non-NULL will push OUTSTREAM on the stack of output streams
 227    and make it therefore active.  OUTSTREAM as NULL will pop the last pushed
 228    output stream; it is an internal error if it does not exist.  */
 229
 230 int
 231 cli_ui_out::do_redirect (ui_file *outstream)
 232 {
 233   if (outstream != NULL)
 234     m_streams.push_back (outstream);
 235   else
 236     m_streams.pop_back ();
 237
 238   return 0;
 239 }
 240
 241 /* local functions */
 242
 243 /* Like cli_ui_out::do_field_fmt, but takes a variable number of args
 244    and makes a va_list and does not insert a separator.  */
 245
 246 /* VARARGS */
 247 void
 248 cli_ui_out::out_field_fmt (int fldno, const char *fldname,
 249                            const char *format, ...)
 250 {
 251   va_list args;
 252
 253   va_start (args, format);
 254   vfprintf_filtered (m_streams.back (), format, args);
 255
 256   va_end (args);
 257 }
 258
 259 void
 260 cli_ui_out::field_separator ()
 261 {
 262   fputc_filtered (' ', m_streams.back ());
 263 }
 264
 265 /* Constructor for cli_ui_out.  */
 266
 267 cli_ui_out::cli_ui_out (ui_file *stream, ui_out_flags flags)
 268 : ui_out (flags),
 269   m_suppress_output (false)
 270 {
 271   gdb_assert (stream != NULL);
 272
 273   m_streams.push_back (stream);
 274 }
 275
 276 cli_ui_out::~cli_ui_out ()
 277 {
 278 }
 279
 280 /* Initialize private members at startup.  */
 281
 282 cli_ui_out *
 283 cli_out_new (struct ui_file *stream)
 284 {
 285   return new cli_ui_out (stream, ui_source_list);
 286 }
 287
 288 ui_file *
 289 cli_ui_out::set_stream (struct ui_file *stream)
 290 {
 291   ui_file *old;
 292
 293   old = m_streams.back ();
 294   m_streams.back () = stream;
 295
 296   return old;
 297 }
 298
 299 /* CLI interface to display tab-completion matches.  */
 300
 301 /* CLI version of displayer.crlf.  */
 302
 303 static void
 304 cli_mld_crlf (const struct match_list_displayer *displayer)
 305 {
 306   rl_crlf ();
 307 }
 308
 309 /* CLI version of displayer.putch.  */
 310
 311 static void
 312 cli_mld_putch (const struct match_list_displayer *displayer, int ch)
 313 {
 314   putc (ch, rl_outstream);
 315 }
 316
 317 /* CLI version of displayer.puts.  */
 318
 319 static void
 320 cli_mld_puts (const struct match_list_displayer *displayer, const char *s)
 321 {
 322   fputs (s, rl_outstream);
 323 }
 324
 325 /* CLI version of displayer.flush.  */
 326
 327 static void
 328 cli_mld_flush (const struct match_list_displayer *displayer)
 329 {
 330   fflush (rl_outstream);
 331 }
 332
 333 EXTERN_C void _rl_erase_entire_line (void);
 334
 335 /* CLI version of displayer.erase_entire_line.  */
 336
 337 static void
 338 cli_mld_erase_entire_line (const struct match_list_displayer *displayer)
 339 {
 340   _rl_erase_entire_line ();
 341 }
 342
 343 /* CLI version of displayer.beep.  */
 344
 345 static void
 346 cli_mld_beep (const struct match_list_displayer *displayer)
 347 {
 348   rl_ding ();
 349 }
 350
 351 /* CLI version of displayer.read_key.  */
 352
 353 static int
 354 cli_mld_read_key (const struct match_list_displayer *displayer)
 355 {
 356   return rl_read_key ();
 357 }
 358
 359 /* CLI version of rl_completion_display_matches_hook.
 360    See gdb_display_match_list for a description of the arguments.  */
 361
 362 void
 363 cli_display_match_list (char **matches, int len, int max)
 364 {
 365   struct match_list_displayer displayer;
 366
 367   rl_get_screen_size (&displayer.height, &displayer.width);
 368   displayer.crlf = cli_mld_crlf;
 369   displayer.putch = cli_mld_putch;
 370   displayer.puts = cli_mld_puts;
 371   displayer.flush = cli_mld_flush;
 372   displayer.erase_entire_line = cli_mld_erase_entire_line;
 373   displayer.beep = cli_mld_beep;
 374   displayer.read_key = cli_mld_read_key;
 375
 376   gdb_display_match_list (matches, len, max, &displayer);
 377   rl_forced_update_display ();
 378 }