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/* TUI display source window.

   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008

   Free Software Foundation, Inc.

   Contributed by Hewlett-Packard Company.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include <ctype.h>

#include "symtab.h"

#include "frame.h"

#include "breakpoint.h"

#include "source.h"

#include "symtab.h"

#include "tui/tui.h"

#include "tui/tui-data.h"

#include "tui/tui-stack.h"

#include "tui/tui-winsource.h"

#include "tui/tui-source.h"

#include "gdb_string.h"

#include "gdb_curses.h"

/* Function to display source in the source window.  */

enum tui_status

tui_set_source_content (struct symtab *s,

                        int line_no,

                        int noerror)

{

  enum tui_status ret = TUI_FAILURE;

  if (s != (struct symtab *) NULL && s->filename != (char *) NULL)

    {

      FILE *stream;

      int i, desc, c, line_width, nlines;

      char *src_line = 0;

      if ((ret = tui_alloc_source_buffer (TUI_SRC_WIN)) == TUI_SUCCESS)

        {

          line_width = TUI_SRC_WIN->generic.width - 1;

          /* Take hilite (window border) into account, when

             calculating the number of lines.  */

          nlines = (line_no + (TUI_SRC_WIN->generic.height - 2)) - line_no;

          desc = open_source_file (s);

          if (desc < 0)

            {

              if (!noerror)

                {

                  char *name = alloca (strlen (s->filename) + 100);

                  sprintf (name, "%s:%d", s->filename, line_no);

                  print_sys_errmsg (name, errno);

                }

              ret = TUI_FAILURE;

            }

          else

            {

              if (s->line_charpos == 0)

                find_source_lines (s, desc);

              if (line_no < 1 || line_no > s->nlines)

                {

                  close (desc);

                  printf_unfiltered (

                          "Line number %d out of range; %s has %d lines.\n",

                                      line_no, s->filename, s->nlines);

                }

              else if (lseek (desc, s->line_charpos[line_no - 1], 0) < 0)

                {

                  close (desc);

                  perror_with_name (s->filename);

                }

              else

                {

                  int offset, cur_line_no, cur_line, cur_len, threshold;

                  struct tui_gen_win_info *locator = tui_locator_win_info_ptr ();

                  struct tui_source_info *src = &TUI_SRC_WIN->detail.source_info;

                  if (TUI_SRC_WIN->generic.title)

                    xfree (TUI_SRC_WIN->generic.title);

                  TUI_SRC_WIN->generic.title = xstrdup (s->filename);

                  if (src->filename)

                    xfree (src->filename);

                  src->filename = xstrdup (s->filename);

                  /* Determine the threshold for the length of the

                     line and the offset to start the display.  */

                  offset = src->horizontal_offset;

                  threshold = (line_width - 1) + offset;

                  stream = fdopen (desc, FOPEN_RT);

                  clearerr (stream);

                  cur_line = 0;

                  src->start_line_or_addr.loa = LOA_LINE;

                  cur_line_no = src->start_line_or_addr.u.line_no = line_no;

                  if (offset > 0)

                    src_line = (char *) xmalloc (

                                           (threshold + 1) * sizeof (char));

                  while (cur_line < nlines)

                    {

                      struct tui_win_element *element = (struct tui_win_element *)

                      TUI_SRC_WIN->generic.content[cur_line];

                      /* Get the first character in the line.  */

                      c = fgetc (stream);

                      if (offset == 0)

                        src_line = ((struct tui_win_element *)

                                   TUI_SRC_WIN->generic.content[

                                        cur_line])->which_element.source.line;

                      /* Init the line with the line number.  */

                      sprintf (src_line, "%-6d", cur_line_no);

                      cur_len = strlen (src_line);

                      i = cur_len -

                        ((cur_len / tui_default_tab_len ()) * tui_default_tab_len ());

                      while (i < tui_default_tab_len ())

                        {

                          src_line[cur_len] = ' ';

                          i++;

                          cur_len++;

                        }

                      src_line[cur_len] = (char) 0;

                      /* Set whether element is the execution point

                         and whether there is a break point on it.  */

                      element->which_element.source.line_or_addr.loa =

                        LOA_LINE;

                      element->which_element.source.line_or_addr.u.line_no =

                        cur_line_no;

                      element->which_element.source.is_exec_point =

                        (strcmp (((struct tui_win_element *)

                                  locator->content[0])->which_element.locator.file_name,

                                 s->filename) == 0

                         && cur_line_no == ((struct tui_win_element *)

                                            locator->content[0])->which_element.locator.line_no);

                      if (c != EOF)

                        {

                          i = strlen (src_line) - 1;

                          do

                            {

                              if ((c != '\n') && (c != '\r')

                                  && (++i < threshold))

                                {

                                  if (c < 040 && c != '\t')

                                    {

                                      src_line[i++] = '^';

                                      src_line[i] = c + 0100;

                                    }

                                  else if (c == 0177)

                                    {

                                      src_line[i++] = '^';

                                      src_line[i] = '?';

                                    }

                                  else

                                    { /* Store the charcter in the

                                         line buffer.  If it is a tab,

                                         then translate to the correct

                                         number of chars so we don't

                                         overwrite our buffer.  */

                                      if (c == '\t')

                                        {

                                          int j, max_tab_len = tui_default_tab_len ();

                                          for (j = i - ((i / max_tab_len) * max_tab_len);

                                               j < max_tab_len

                                                 && i < threshold;

                                               i++, j++)

                                            src_line[i] = ' ';

                                          i--;

                                        }

                                      else

                                        src_line[i] = c;

                                    }

                                  src_line[i + 1] = 0;

                                }

                              else

                                { /* If we have not reached EOL, then

                                     eat chars until we do.  */

                                  while (c != EOF && c != '\n' && c != '\r')

                                    c = fgetc (stream);

                                  /* Handle non-'\n' end-of-line.  */

                                  if (c == '\r'

                                      && (c = fgetc (stream)) != '\n'

                                      && c != EOF)

                                    {

                                       ungetc (c, stream);

                                       c = '\r';

                                    }

                                }

                            }

                          while (c != EOF && c != '\n' && c != '\r'

                                 && i < threshold

                                 && (c = fgetc (stream)));

                        }

                      /* Now copy the line taking the offset into

                         account.  */

                      if (strlen (src_line) > offset)

                        strcpy (((struct tui_win_element *) TUI_SRC_WIN->generic.content[

                                        cur_line])->which_element.source.line,

                                &src_line[offset]);

                      else

                        ((struct tui_win_element *)

                         TUI_SRC_WIN->generic.content[

                          cur_line])->which_element.source.line[0] = (char) 0;

                      cur_line++;

                      cur_line_no++;

                    }

                  if (offset > 0)

                    xfree (src_line);

                  fclose (stream);

                  TUI_SRC_WIN->generic.content_size = nlines;

                  ret = TUI_SUCCESS;

                }

            }

        }

    }

  return ret;

}

/* elz: This function sets the contents of the source window to empty

   except for a line in the middle with a warning message about the

   source not being available.  This function is called by

   tui_erase_source_contents(), which in turn is invoked when the

   source files cannot be accessed.  */

void

tui_set_source_content_nil (struct tui_win_info *win_info,

                            char *warning_string)

{

  int line_width;

  int n_lines;

  int curr_line = 0;

  line_width = win_info->generic.width - 1;

  n_lines = win_info->generic.height - 2;

  /* Set to empty each line in the window, except for the one which

     contains the message.  */

  while (curr_line < win_info->generic.content_size)

    {

      /* Set the information related to each displayed line to null:

         i.e. the line number is 0, there is no bp, it is not where

         the program is stopped.  */

      struct tui_win_element *element =

        (struct tui_win_element *) win_info->generic.content[curr_line];

      element->which_element.source.line_or_addr.loa = LOA_LINE;

      element->which_element.source.line_or_addr.u.line_no = 0;

      element->which_element.source.is_exec_point = FALSE;

      element->which_element.source.has_break = FALSE;

      /* Set the contents of the line to blank.  */

      element->which_element.source.line[0] = (char) 0;

      /* If the current line is in the middle of the screen, then we

         want to display the 'no source available' message in it.

         Note: the 'weird' arithmetic with the line width and height

         comes from the function tui_erase_source_content().  We need

         to keep the screen and the window's actual contents in

         synch.  */

      if (curr_line == (n_lines / 2 + 1))

        {

          int i;

          int xpos;

          int warning_length = strlen (warning_string);

          char *src_line;

          src_line = element->which_element.source.line;

          if (warning_length >= ((line_width - 1) / 2))

            xpos = 1;

          else

            xpos = (line_width - 1) / 2 - warning_length;

          for (i = 0; i < xpos; i++)

            src_line[i] = ' ';

          sprintf (src_line + i, "%s", warning_string);

          for (i = xpos + warning_length; i < line_width; i++)

            src_line[i] = ' ';

          src_line[i] = '\n';

        }                       /* end if */

      curr_line++;

    }                           /* end while */

}

/* Function to display source in the source window.  This function

   initializes the horizontal scroll to 0.  */

void

tui_show_symtab_source (struct symtab *s,

                        struct tui_line_or_address line,

                        int noerror)

{

  TUI_SRC_WIN->detail.source_info.horizontal_offset = 0;

  tui_update_source_window_as_is (TUI_SRC_WIN, s, line, noerror);

}

/* Answer whether the source is currently displayed in the source

   window.  */

int

tui_source_is_displayed (char *fname)

{

  return (TUI_SRC_WIN->generic.content_in_use

          && (strcmp (((struct tui_win_element *) (tui_locator_win_info_ptr ())->

                       content[0])->which_element.locator.file_name, fname) == 0));

}

/* Scroll the source forward or backward vertically.  */

void

tui_vertical_source_scroll (enum tui_scroll_direction scroll_direction,

                            int num_to_scroll)

{

  if (TUI_SRC_WIN->generic.content != NULL)

    {

      struct tui_line_or_address l;

      struct symtab *s;

      tui_win_content content = (tui_win_content) TUI_SRC_WIN->generic.content;

      struct symtab_and_line cursal = get_current_source_symtab_and_line ();

      if (cursal.symtab == (struct symtab *) NULL)

        s = find_pc_symtab (get_frame_pc (get_selected_frame (NULL)));

      else

        s = cursal.symtab;

      l.loa = LOA_LINE;

      if (scroll_direction == FORWARD_SCROLL)

        {

          l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no

            + num_to_scroll;

          if (l.u.line_no > s->nlines)

            /* line = s->nlines - win_info->generic.content_size + 1; */

            /* elz: fix for dts 23398.  */

            l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no;

        }

      else

        {

          l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no

            - num_to_scroll;

          if (l.u.line_no <= 0)

            l.u.line_no = 1;

        }

      print_source_lines (s, l.u.line_no, l.u.line_no + 1, 0);

    }

}