gdb/tui/tui-source.c

   1 /* TUI display source window.
   2
   3    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009
   4    Free Software Foundation, Inc.
   5
   6    Contributed by Hewlett-Packard Company.
   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 <ctype.h>
  25 #include "symtab.h"
  26 #include "frame.h"
  27 #include "breakpoint.h"
  28 #include "source.h"
  29 #include "symtab.h"
  30
  31 #include "tui/tui.h"
  32 #include "tui/tui-data.h"
  33 #include "tui/tui-stack.h"
  34 #include "tui/tui-winsource.h"
  35 #include "tui/tui-source.h"
  36
  37 #include "gdb_string.h"
  38 #include "gdb_curses.h"
  39
  40 /* Function to display source in the source window.  */
  41 enum tui_status
  42 tui_set_source_content (struct symtab *s,
  43                         int line_no,
  44                         int noerror)
  45 {
  46   enum tui_status ret = TUI_FAILURE;
  47
  48   if (s != (struct symtab *) NULL && s->filename != (char *) NULL)
  49     {
  50       FILE *stream;
  51       int i, desc, c, line_width, nlines;
  52       char *src_line = 0;
  53
  54       if ((ret = tui_alloc_source_buffer (TUI_SRC_WIN)) == TUI_SUCCESS)
  55         {
  56           line_width = TUI_SRC_WIN->generic.width - 1;
  57           /* Take hilite (window border) into account, when
  58              calculating the number of lines.  */
  59           nlines = (line_no + (TUI_SRC_WIN->generic.height - 2)) - line_no;
  60           desc = open_source_file (s);
  61           if (desc < 0)
  62             {
  63               if (!noerror)
  64                 {
  65                   char *name = alloca (strlen (s->filename) + 100);
  66                   sprintf (name, "%s:%d", s->filename, line_no);
  67                   print_sys_errmsg (name, errno);
  68                 }
  69               ret = TUI_FAILURE;
  70             }
  71           else
  72             {
  73               if (s->line_charpos == 0)
  74                 find_source_lines (s, desc);
  75
  76               if (line_no < 1 || line_no > s->nlines)
  77                 {
  78                   close (desc);
  79                   printf_unfiltered (
  80                           "Line number %d out of range; %s has %d lines.\n",
  81                                       line_no, s->filename, s->nlines);
  82                 }
  83               else if (lseek (desc, s->line_charpos[line_no - 1], 0) < 0)
  84                 {
  85                   close (desc);
  86                   perror_with_name (s->filename);
  87                 }
  88               else
  89                 {
  90                   int offset, cur_line_no, cur_line, cur_len, threshold;
  91                   struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();
  92                   struct tui_source_info *src = &TUI_SRC_WIN->detail.source_info;
  93
  94                   if (TUI_SRC_WIN->generic.title)
  95                     xfree (TUI_SRC_WIN->generic.title);
  96                   TUI_SRC_WIN->generic.title = xstrdup (s->filename);
  97
  98                   if (src->filename)
  99                     xfree (src->filename);
 100                   src->filename = xstrdup (s->filename);
 101
 102                   /* Determine the threshold for the length of the
 103                      line and the offset to start the display.  */
 104                   offset = src->horizontal_offset;
 105                   threshold = (line_width - 1) + offset;
 106                   stream = fdopen (desc, FOPEN_RT);
 107                   clearerr (stream);
 108                   cur_line = 0;
 109                   src->start_line_or_addr.loa = LOA_LINE;
 110                   cur_line_no = src->start_line_or_addr.u.line_no = line_no;
 111                   if (offset > 0)
 112                     src_line = (char *) xmalloc (
 113                                            (threshold + 1) * sizeof (char));
 114                   while (cur_line < nlines)
 115                     {
 116                       struct tui_win_element *element = (struct tui_win_element *)
 117                       TUI_SRC_WIN->generic.content[cur_line];
 118
 119                       /* Get the first character in the line.  */
 120                       c = fgetc (stream);
 121
 122                       if (offset == 0)
 123                         src_line = ((struct tui_win_element *)
 124                                    TUI_SRC_WIN->generic.content[
 125                                         cur_line])->which_element.source.line;
 126                       /* Init the line with the line number.  */
 127                       sprintf (src_line, "%-6d", cur_line_no);
 128                       cur_len = strlen (src_line);
 129                       i = cur_len -
 130                         ((cur_len / tui_default_tab_len ()) * tui_default_tab_len ());
 131                       while (i < tui_default_tab_len ())
 132                         {
 133                           src_line[cur_len] = ' ';
 134                           i++;
 135                           cur_len++;
 136                         }
 137                       src_line[cur_len] = (char) 0;
 138
 139                       /* Set whether element is the execution point
 140                          and whether there is a break point on it.  */
 141                       element->which_element.source.line_or_addr.loa =
 142                         LOA_LINE;
 143                       element->which_element.source.line_or_addr.u.line_no =
 144                         cur_line_no;
 145                       element->which_element.source.is_exec_point =
 146                         (strcmp (((struct tui_win_element *)
 147                                   locator->content[0])->which_element.locator.file_name,
 148                                  s->filename) == 0
 149                          && cur_line_no == ((struct tui_win_element *)
 150                                             locator->content[0])->which_element.locator.line_no);
 151                       if (c != EOF)
 152                         {
 153                           i = strlen (src_line) - 1;
 154                           do
 155                             {
 156                               if ((c != '\n') && (c != '\r')
 157                                   && (++i < threshold))
 158                                 {
 159                                   if (c < 040 && c != '\t')
 160                                     {
 161                                       src_line[i++] = '^';
 162                                       src_line[i] = c + 0100;
 163                                     }
 164                                   else if (c == 0177)
 165                                     {
 166                                       src_line[i++] = '^';
 167                                       src_line[i] = '?';
 168                                     }
 169                                   else
 170                                     { /* Store the charcter in the
 171                                          line buffer.  If it is a tab,
 172                                          then translate to the correct
 173                                          number of chars so we don't
 174                                          overwrite our buffer.  */
 175                                       if (c == '\t')
 176                                         {
 177                                           int j, max_tab_len = tui_default_tab_len ();
 178
 179                                           for (j = i - ((i / max_tab_len) * max_tab_len);
 180                                                j < max_tab_len
 181                                                  && i < threshold;
 182                                                i++, j++)
 183                                             src_line[i] = ' ';
 184                                           i--;
 185                                         }
 186                                       else
 187                                         src_line[i] = c;
 188                                     }
 189                                   src_line[i + 1] = 0;
 190                                 }
 191                               else
 192                                 { /* If we have not reached EOL, then
 193                                      eat chars until we do.  */
 194                                   while (c != EOF && c != '\n' && c != '\r')
 195                                     c = fgetc (stream);
 196                                   /* Handle non-'\n' end-of-line.  */
 197                                   if (c == '\r'
 198                                       && (c = fgetc (stream)) != '\n'
 199                                       && c != EOF)
 200                                     {
 201                                        ungetc (c, stream);
 202                                        c = '\r';
 203                                     }
 204
 205                                 }
 206                             }
 207                           while (c != EOF && c != '\n' && c != '\r'
 208                                  && i < threshold
 209                                  && (c = fgetc (stream)));
 210                         }
 211                       /* Now copy the line taking the offset into
 212                          account.  */
 213                       if (strlen (src_line) > offset)
 214                         strcpy (((struct tui_win_element *) TUI_SRC_WIN->generic.content[
 215                                         cur_line])->which_element.source.line,
 216                                 &src_line[offset]);
 217                       else
 218                         ((struct tui_win_element *)
 219                          TUI_SRC_WIN->generic.content[
 220                           cur_line])->which_element.source.line[0] = (char) 0;
 221                       cur_line++;
 222                       cur_line_no++;
 223                     }
 224                   if (offset > 0)
 225                     xfree (src_line);
 226                   fclose (stream);
 227                   TUI_SRC_WIN->generic.content_size = nlines;
 228                   ret = TUI_SUCCESS;
 229                 }
 230             }
 231         }
 232     }
 233   return ret;
 234 }
 235
 236
 237 /* elz: This function sets the contents of the source window to empty
 238    except for a line in the middle with a warning message about the
 239    source not being available.  This function is called by
 240    tui_erase_source_contents(), which in turn is invoked when the
 241    source files cannot be accessed.  */
 242
 243 void
 244 tui_set_source_content_nil (struct tui_win_info *win_info,
 245                             char *warning_string)
 246 {
 247   int line_width;
 248   int n_lines;
 249   int curr_line = 0;
 250
 251   line_width = win_info->generic.width - 1;
 252   n_lines = win_info->generic.height - 2;
 253
 254   /* Set to empty each line in the window, except for the one which
 255      contains the message.  */
 256   while (curr_line < win_info->generic.content_size)
 257     {
 258       /* Set the information related to each displayed line to null:
 259          i.e. the line number is 0, there is no bp, it is not where
 260          the program is stopped.  */
 261
 262       struct tui_win_element *element =
 263         (struct tui_win_element *) win_info->generic.content[curr_line];
 264       element->which_element.source.line_or_addr.loa = LOA_LINE;
 265       element->which_element.source.line_or_addr.u.line_no = 0;
 266       element->which_element.source.is_exec_point = FALSE;
 267       element->which_element.source.has_break = FALSE;
 268
 269       /* Set the contents of the line to blank.  */
 270       element->which_element.source.line[0] = (char) 0;
 271
 272       /* If the current line is in the middle of the screen, then we
 273          want to display the 'no source available' message in it.
 274          Note: the 'weird' arithmetic with the line width and height
 275          comes from the function tui_erase_source_content().  We need
 276          to keep the screen and the window's actual contents in
 277          synch.  */
 278
 279       if (curr_line == (n_lines / 2 + 1))
 280         {
 281           int i;
 282           int xpos;
 283           int warning_length = strlen (warning_string);
 284           char *src_line;
 285
 286           src_line = element->which_element.source.line;
 287
 288           if (warning_length >= ((line_width - 1) / 2))
 289             xpos = 1;
 290           else
 291             xpos = (line_width - 1) / 2 - warning_length;
 292
 293           for (i = 0; i < xpos; i++)
 294             src_line[i] = ' ';
 295
 296           sprintf (src_line + i, "%s", warning_string);
 297
 298           for (i = xpos + warning_length; i < line_width; i++)
 299             src_line[i] = ' ';
 300
 301           src_line[i] = '\n';
 302
 303         }                       /* end if */
 304
 305       curr_line++;
 306
 307     }                           /* end while */
 308 }
 309
 310
 311 /* Function to display source in the source window.  This function
 312    initializes the horizontal scroll to 0.  */
 313 void
 314 tui_show_symtab_source (struct symtab *s,
 315                         struct tui_line_or_address line,
 316                         int noerror)
 317 {
 318   TUI_SRC_WIN->detail.source_info.horizontal_offset = 0;
 319   tui_update_source_window_as_is (TUI_SRC_WIN, s, line, noerror);
 320 }
 321
 322
 323 /* Answer whether the source is currently displayed in the source
 324    window.  */
 325 int
 326 tui_source_is_displayed (char *fname)
 327 {
 328   return (TUI_SRC_WIN->generic.content_in_use
 329           && (strcmp (((struct tui_win_element *) (tui_locator_win_info_ptr ())->
 330                        content[0])->which_element.locator.file_name, fname) == 0));
 331 }
 332
 333
 334 /* Scroll the source forward or backward vertically.  */
 335 void
 336 tui_vertical_source_scroll (enum tui_scroll_direction scroll_direction,
 337                             int num_to_scroll)
 338 {
 339   if (TUI_SRC_WIN->generic.content != NULL)
 340     {
 341       struct tui_line_or_address l;
 342       struct symtab *s;
 343       tui_win_content content = (tui_win_content) TUI_SRC_WIN->generic.content;
 344       struct symtab_and_line cursal = get_current_source_symtab_and_line ();
 345
 346       if (cursal.symtab == (struct symtab *) NULL)
 347         s = find_pc_symtab (get_frame_pc (get_selected_frame (NULL)));
 348       else
 349         s = cursal.symtab;
 350
 351       l.loa = LOA_LINE;
 352       if (scroll_direction == FORWARD_SCROLL)
 353         {
 354           l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no
 355             + num_to_scroll;
 356           if (l.u.line_no > s->nlines)
 357             /* line = s->nlines - win_info->generic.content_size + 1; */
 358             /* elz: fix for dts 23398.  */
 359             l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no;
 360         }
 361       else
 362         {
 363           l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no
 364             - num_to_scroll;
 365           if (l.u.line_no <= 0)
 366             l.u.line_no = 1;
 367         }
 368
 369       print_source_lines (s, l.u.line_no, l.u.line_no + 1, 0);
 370     }
 371 }