gdb/tui/tui-source.c

   1 /* TUI display source window.
   2
   3    Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007
   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 2 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, write to the Free Software
  22    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23    Boston, MA 02110-1301, USA.  */
  24
  25 #include "defs.h"
  26 #include <ctype.h>
  27 #include "symtab.h"
  28 #include "frame.h"
  29 #include "breakpoint.h"
  30 #include "source.h"
  31 #include "symtab.h"
  32
  33 #include "tui/tui.h"
  34 #include "tui/tui-data.h"
  35 #include "tui/tui-stack.h"
  36 #include "tui/tui-winsource.h"
  37 #include "tui/tui-source.h"
  38
  39 #include "gdb_string.h"
  40 #include "gdb_curses.h"
  41
  42 /* Function to display source in the source window.  */
  43 enum tui_status
  44 tui_set_source_content (struct symtab *s, int line_no, 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 calculating
  58              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 line
 103                      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 and
 140                          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') &&
 157                                   (c != '\r') && (++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 line
 171                                            buffer.  If it is a tab, then
 172                                            translate to the correct number of
 173                                            chars so we don't overwrite our
 174                                            buffer.  */
 175                                       if (c == '\t')
 176                                         {
 177                                           int j, max_tab_len = tui_default_tab_len ();
 178
 179                                           for (j = i - (
 180                                                (i / max_tab_len) * max_tab_len);
 181                                                ((j < max_tab_len) &&
 182                                                 i < threshold);
 183                                                i++, j++)
 184                                             src_line[i] = ' ';
 185                                           i--;
 186                                         }
 187                                       else
 188                                         src_line[i] = c;
 189                                     }
 190                                   src_line[i + 1] = 0;
 191                                 }
 192                               else
 193                                 {       /* If we have not reached EOL, then eat
 194                                            chars until we do  */
 195                                   while (c != EOF && c != '\n' && c != '\r')
 196                                     c = fgetc (stream);
 197                                   /* Handle non-'\n' end-of-line.  */
 198                                   if (c == '\r' &&
 199                                      (c = fgetc (stream)) != '\n' && 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 && (c = fgetc (stream)));
 209                         }
 210                       /* Now copy the line taking the offset into account */
 211                       if (strlen (src_line) > offset)
 212                         strcpy (((struct tui_win_element *) TUI_SRC_WIN->generic.content[
 213                                         cur_line])->which_element.source.line,
 214                                 &src_line[offset]);
 215                       else
 216                         ((struct tui_win_element *)
 217                          TUI_SRC_WIN->generic.content[
 218                           cur_line])->which_element.source.line[0] = (char) 0;
 219                       cur_line++;
 220                       cur_line_no++;
 221                     }
 222                   if (offset > 0)
 223                     xfree (src_line);
 224                   fclose (stream);
 225                   TUI_SRC_WIN->generic.content_size = nlines;
 226                   ret = TUI_SUCCESS;
 227                 }
 228             }
 229         }
 230     }
 231   return ret;
 232 }
 233
 234
 235 /* elz: this function sets the contents of the source window to empty
 236    except for a line in the middle with a warning message about the
 237    source not being available. This function is called by
 238    tui_erase_source_contents(), which in turn is invoked when the
 239    source files cannot be accessed.  */
 240
 241 void
 242 tui_set_source_content_nil (struct tui_win_info *win_info, char *warning_string)
 243 {
 244   int line_width;
 245   int n_lines;
 246   int curr_line = 0;
 247
 248   line_width = win_info->generic.width - 1;
 249   n_lines = win_info->generic.height - 2;
 250
 251   /* set to empty each line in the window, except for the one
 252      which contains the message */
 253   while (curr_line < win_info->generic.content_size)
 254     {
 255       /* set the information related to each displayed line
 256          to null: i.e. the line number is 0, there is no bp,
 257          it is not where the program is stopped */
 258
 259       struct tui_win_element *element =
 260         (struct tui_win_element *) win_info->generic.content[curr_line];
 261       element->which_element.source.line_or_addr.loa = LOA_LINE;
 262       element->which_element.source.line_or_addr.u.line_no = 0;
 263       element->which_element.source.is_exec_point = FALSE;
 264       element->which_element.source.has_break = FALSE;
 265
 266       /* set the contents of the line to blank */
 267       element->which_element.source.line[0] = (char) 0;
 268
 269       /* if the current line is in the middle of the screen, then we
 270          want to display the 'no source available' message in it.
 271          Note: the 'weird' arithmetic with the line width and height
 272          comes from the function tui_erase_source_content(). We need
 273          to keep the screen and the window's actual contents in synch.  */
 274
 275       if (curr_line == (n_lines / 2 + 1))
 276         {
 277           int i;
 278           int xpos;
 279           int warning_length = strlen (warning_string);
 280           char *src_line;
 281
 282           src_line = element->which_element.source.line;
 283
 284           if (warning_length >= ((line_width - 1) / 2))
 285             xpos = 1;
 286           else
 287             xpos = (line_width - 1) / 2 - warning_length;
 288
 289           for (i = 0; i < xpos; i++)
 290             src_line[i] = ' ';
 291
 292           sprintf (src_line + i, "%s", warning_string);
 293
 294           for (i = xpos + warning_length; i < line_width; i++)
 295             src_line[i] = ' ';
 296
 297           src_line[i] = '\n';
 298
 299         }                       /* end if */
 300
 301       curr_line++;
 302
 303     }                           /* end while */
 304 }
 305
 306
 307 /* Function to display source in the source window.  This function
 308    initializes the horizontal scroll to 0.  */
 309 void
 310 tui_show_symtab_source (struct symtab *s, struct tui_line_or_address line, int noerror)
 311 {
 312   TUI_SRC_WIN->detail.source_info.horizontal_offset = 0;
 313   tui_update_source_window_as_is (TUI_SRC_WIN, s, line, noerror);
 314 }
 315
 316
 317 /* Answer whether the source is currently displayed in the source
 318    window.  */
 319 int
 320 tui_source_is_displayed (char *fname)
 321 {
 322   return (TUI_SRC_WIN->generic.content_in_use &&
 323           (strcmp (((struct tui_win_element *) (tui_locator_win_info_ptr ())->
 324                   content[0])->which_element.locator.file_name, fname) == 0));
 325 }
 326
 327
 328 /* Scroll the source forward or backward vertically.  */
 329 void
 330 tui_vertical_source_scroll (enum tui_scroll_direction scroll_direction,
 331                             int num_to_scroll)
 332 {
 333   if (TUI_SRC_WIN->generic.content != NULL)
 334     {
 335       struct tui_line_or_address l;
 336       struct symtab *s;
 337       tui_win_content content = (tui_win_content) TUI_SRC_WIN->generic.content;
 338       struct symtab_and_line cursal = get_current_source_symtab_and_line ();
 339
 340       if (cursal.symtab == (struct symtab *) NULL)
 341         s = find_pc_symtab (get_frame_pc (get_selected_frame (NULL)));
 342       else
 343         s = cursal.symtab;
 344
 345       l.loa = LOA_LINE;
 346       if (scroll_direction == FORWARD_SCROLL)
 347         {
 348           l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no
 349             + num_to_scroll;
 350           if (l.u.line_no > s->nlines)
 351             /*line = s->nlines - win_info->generic.content_size + 1; */
 352             /*elz: fix for dts 23398 */
 353             l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no;
 354         }
 355       else
 356         {
 357           l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no
 358             - num_to_scroll;
 359           if (l.u.line_no <= 0)
 360             l.u.line_no = 1;
 361         }
 362
 363       print_source_lines (s, l.u.line_no, l.u.line_no + 1, 0);
 364     }
 365 }