gdb/tui/tui-source.c

   1 /* TUI display source window.
   2
   3    Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 Free Software
   4    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., 59 Temple Place - Suite 330,
  23    Boston, MA 02111-1307, 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_curses.h"
  40
  41 /* Function to display source in the source window.  */
  42 enum tui_status
  43 tui_set_source_content (struct symtab *s, int line_no, int noerror)
  44 {
  45   enum tui_status ret = TUI_FAILURE;
  46
  47   if (s != (struct symtab *) NULL && s->filename != (char *) NULL)
  48     {
  49       FILE *stream;
  50       int i, desc, c, line_width, nlines;
  51       char *src_line = 0;
  52
  53       if ((ret = tui_alloc_source_buffer (TUI_SRC_WIN)) == TUI_SUCCESS)
  54         {
  55           line_width = TUI_SRC_WIN->generic.width - 1;
  56           /* Take hilite (window border) into account, when calculating
  57              the number of lines  */
  58           nlines = (line_no + (TUI_SRC_WIN->generic.height - 2)) - line_no;
  59           desc = open_source_file (s);
  60           if (desc < 0)
  61             {
  62               if (!noerror)
  63                 {
  64                   char *name = alloca (strlen (s->filename) + 100);
  65                   sprintf (name, "%s:%d", s->filename, line_no);
  66                   print_sys_errmsg (name, errno);
  67                 }
  68               ret = TUI_FAILURE;
  69             }
  70           else
  71             {
  72               if (s->line_charpos == 0)
  73                 find_source_lines (s, desc);
  74
  75               if (line_no < 1 || line_no > s->nlines)
  76                 {
  77                   close (desc);
  78                   printf_unfiltered (
  79                           "Line number %d out of range; %s has %d lines.\n",
  80                                       line_no, s->filename, s->nlines);
  81                 }
  82               else if (lseek (desc, s->line_charpos[line_no - 1], 0) < 0)
  83                 {
  84                   close (desc);
  85                   perror_with_name (s->filename);
  86                 }
  87               else
  88                 {
  89                   int offset, cur_line_no, cur_line, cur_len, threshold;
  90                   struct tui_gen_win_info * locator = tui_locator_win_info_ptr ();
  91                   struct tui_source_info * src = &TUI_SRC_WIN->detail.source_info;
  92
  93                   if (TUI_SRC_WIN->generic.title)
  94                     xfree (TUI_SRC_WIN->generic.title);
  95                   TUI_SRC_WIN->generic.title = xstrdup (s->filename);
  96
  97                   if (src->filename)
  98                     xfree (src->filename);
  99                   src->filename = xstrdup (s->filename);
 100
 101                   /* Determine the threshold for the length of the line
 102                      and the offset to start the display.  */
 103                   offset = src->horizontal_offset;
 104                   threshold = (line_width - 1) + offset;
 105                   stream = fdopen (desc, FOPEN_RT);
 106                   clearerr (stream);
 107                   cur_line = 0;
 108                   cur_line_no = src->start_line_or_addr.line_no = line_no;
 109                   if (offset > 0)
 110                     src_line = (char *) xmalloc (
 111                                            (threshold + 1) * sizeof (char));
 112                   while (cur_line < nlines)
 113                     {
 114                       struct tui_win_element * element = (struct tui_win_element *)
 115                       TUI_SRC_WIN->generic.content[cur_line];
 116
 117                       /* get the first character in the line */
 118                       c = fgetc (stream);
 119
 120                       if (offset == 0)
 121                         src_line = ((struct tui_win_element *)
 122                                    TUI_SRC_WIN->generic.content[
 123                                         cur_line])->which_element.source.line;
 124                       /* Init the line with the line number */
 125                       sprintf (src_line, "%-6d", cur_line_no);
 126                       cur_len = strlen (src_line);
 127                       i = cur_len -
 128                         ((cur_len / tui_default_tab_len ()) * tui_default_tab_len ());
 129                       while (i < tui_default_tab_len ())
 130                         {
 131                           src_line[cur_len] = ' ';
 132                           i++;
 133                           cur_len++;
 134                         }
 135                       src_line[cur_len] = (char) 0;
 136
 137                       /* Set whether element is the execution point and
 138                          whether there is a break point on it.  */
 139                       element->which_element.source.line_or_addr.line_no =
 140                         cur_line_no;
 141                       element->which_element.source.is_exec_point =
 142                         (strcmp (((struct tui_win_element *)
 143                         locator->content[0])->which_element.locator.file_name,
 144                                  s->filename) == 0
 145                          && cur_line_no == ((struct tui_win_element *)
 146                          locator->content[0])->which_element.locator.line_no);
 147                       if (c != EOF)
 148                         {
 149                           i = strlen (src_line) - 1;
 150                           do
 151                             {
 152                               if ((c != '\n') &&
 153                                   (c != '\r') && (++i < threshold))
 154                                 {
 155                                   if (c < 040 && c != '\t')
 156                                     {
 157                                       src_line[i++] = '^';
 158                                       src_line[i] = c + 0100;
 159                                     }
 160                                   else if (c == 0177)
 161                                     {
 162                                       src_line[i++] = '^';
 163                                       src_line[i] = '?';
 164                                     }
 165                                   else
 166                                     {   /* Store the charcter in the line
 167                                            buffer.  If it is a tab, then
 168                                            translate to the correct number of
 169                                            chars so we don't overwrite our
 170                                            buffer.  */
 171                                       if (c == '\t')
 172                                         {
 173                                           int j, max_tab_len = tui_default_tab_len ();
 174
 175                                           for (j = i - (
 176                                                (i / max_tab_len) * max_tab_len);
 177                                                ((j < max_tab_len) &&
 178                                                 i < threshold);
 179                                                i++, j++)
 180                                             src_line[i] = ' ';
 181                                           i--;
 182                                         }
 183                                       else
 184                                         src_line[i] = c;
 185                                     }
 186                                   src_line[i + 1] = 0;
 187                                 }
 188                               else
 189                                 {       /* If we have not reached EOL, then eat
 190                                            chars until we do  */
 191                                   while (c != EOF && c != '\n' && c != '\r')
 192                                     c = fgetc (stream);
 193                                 }
 194                             }
 195                           while (c != EOF && c != '\n' && c != '\r' &&
 196                                  i < threshold && (c = fgetc (stream)));
 197                         }
 198                       /* Now copy the line taking the offset into account */
 199                       if (strlen (src_line) > offset)
 200                         strcpy (((struct tui_win_element *) TUI_SRC_WIN->generic.content[
 201                                         cur_line])->which_element.source.line,
 202                                 &src_line[offset]);
 203                       else
 204                         ((struct tui_win_element *)
 205                          TUI_SRC_WIN->generic.content[
 206                           cur_line])->which_element.source.line[0] = (char) 0;
 207                       cur_line++;
 208                       cur_line_no++;
 209                     }
 210                   if (offset > 0)
 211                     xfree (src_line);
 212                   fclose (stream);
 213                   TUI_SRC_WIN->generic.content_size = nlines;
 214                   ret = TUI_SUCCESS;
 215                 }
 216             }
 217         }
 218     }
 219   return ret;
 220 }
 221
 222
 223 /* elz: this function sets the contents of the source window to empty
 224    except for a line in the middle with a warning message about the
 225    source not being available. This function is called by
 226    tui_erase_source_contents(), which in turn is invoked when the
 227    source files cannot be accessed.  */
 228
 229 void
 230 tui_set_source_content_nil (struct tui_win_info * win_info, char *warning_string)
 231 {
 232   int line_width;
 233   int n_lines;
 234   int curr_line = 0;
 235
 236   line_width = win_info->generic.width - 1;
 237   n_lines = win_info->generic.height - 2;
 238
 239   /* set to empty each line in the window, except for the one
 240      which contains the message */
 241   while (curr_line < win_info->generic.content_size)
 242     {
 243       /* set the information related to each displayed line
 244          to null: i.e. the line number is 0, there is no bp,
 245          it is not where the program is stopped */
 246
 247       struct tui_win_element * element =
 248       (struct tui_win_element *) win_info->generic.content[curr_line];
 249       element->which_element.source.line_or_addr.line_no = 0;
 250       element->which_element.source.is_exec_point = FALSE;
 251       element->which_element.source.has_break = FALSE;
 252
 253       /* set the contents of the line to blank */
 254       element->which_element.source.line[0] = (char) 0;
 255
 256       /* if the current line is in the middle of the screen, then we
 257          want to display the 'no source available' message in it.
 258          Note: the 'weird' arithmetic with the line width and height
 259          comes from the function tui_erase_source_content(). We need
 260          to keep the screen and the window's actual contents in synch.  */
 261
 262       if (curr_line == (n_lines / 2 + 1))
 263         {
 264           int i;
 265           int xpos;
 266           int warning_length = strlen (warning_string);
 267           char *src_line;
 268
 269           src_line = element->which_element.source.line;
 270
 271           if (warning_length >= ((line_width - 1) / 2))
 272             xpos = 1;
 273           else
 274             xpos = (line_width - 1) / 2 - warning_length;
 275
 276           for (i = 0; i < xpos; i++)
 277             src_line[i] = ' ';
 278
 279           sprintf (src_line + i, "%s", warning_string);
 280
 281           for (i = xpos + warning_length; i < line_width; i++)
 282             src_line[i] = ' ';
 283
 284           src_line[i] = '\n';
 285
 286         }                       /* end if */
 287
 288       curr_line++;
 289
 290     }                           /* end while */
 291 }
 292
 293
 294 /* Function to display source in the source window.  This function
 295    initializes the horizontal scroll to 0.  */
 296 void
 297 tui_show_symtab_source (struct symtab *s, union tui_line_or_address line, int noerror)
 298 {
 299   TUI_SRC_WIN->detail.source_info.horizontal_offset = 0;
 300   tui_update_source_window_as_is (TUI_SRC_WIN, s, line, noerror);
 301 }
 302
 303
 304 /* Answer whether the source is currently displayed in the source
 305    window.  */
 306 int
 307 tui_source_is_displayed (char *fname)
 308 {
 309   return (TUI_SRC_WIN->generic.content_in_use &&
 310           (strcmp (((struct tui_win_element *) (tui_locator_win_info_ptr ())->
 311                   content[0])->which_element.locator.file_name, fname) == 0));
 312 }
 313
 314
 315 /* Scroll the source forward or backward vertically.  */
 316 void
 317 tui_vertical_source_scroll (enum tui_scroll_direction scroll_direction,
 318                             int num_to_scroll)
 319 {
 320   if (TUI_SRC_WIN->generic.content != NULL)
 321     {
 322       union tui_line_or_address l;
 323       struct symtab *s;
 324       tui_win_content content = (tui_win_content) TUI_SRC_WIN->generic.content;
 325       struct symtab_and_line cursal = get_current_source_symtab_and_line ();
 326
 327       if (cursal.symtab == (struct symtab *) NULL)
 328         s = find_pc_symtab (get_frame_pc (deprecated_selected_frame));
 329       else
 330         s = cursal.symtab;
 331
 332       if (scroll_direction == FORWARD_SCROLL)
 333         {
 334           l.line_no = content[0]->which_element.source.line_or_addr.line_no +
 335             num_to_scroll;
 336           if (l.line_no > s->nlines)
 337             /*line = s->nlines - win_info->generic.content_size + 1; */
 338             /*elz: fix for dts 23398 */
 339             l.line_no = content[0]->which_element.source.line_or_addr.line_no;
 340         }
 341       else
 342         {
 343           l.line_no = content[0]->which_element.source.line_or_addr.line_no -
 344             num_to_scroll;
 345           if (l.line_no <= 0)
 346             l.line_no = 1;
 347         }
 348
 349       print_source_lines (s, l.line_no, l.line_no + 1, 0);
 350     }
 351 }