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