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/* TUI display source window.

   Copyright 1998, 1999, 2000, 2001, 2002 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 2 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, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

/* FIXME: cagney/2002-02-28: The GDB coding standard indicates that

   "defs.h" should be included first.  Unfortunatly some systems

   (currently Debian GNU/Linux) include the <stdbool.h> via <curses.h>

   and they clash with "bfd.h"'s definiton of true/false.  The correct

   fix is to remove true/false from "bfd.h", however, until that

   happens, hack around it by including "config.h" and <curses.h>

   first.  */

#include "config.h"

#ifdef HAVE_NCURSES_H       

#include <ncurses.h>

#else

#ifdef HAVE_CURSES_H

#include <curses.h>

#endif

#endif

#include "defs.h"

#include <ctype.h>

#include "symtab.h"

#include "frame.h"

#include "breakpoint.h"

#include "source.h"

#include "symtab.h"

#include "tui.h"

#include "tuiData.h"

#include "tuiStack.h"

#include "tuiSourceWin.h"

#include "tuiSource.h"

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

TuiStatus

tuiSetSourceContent (struct symtab *s, int lineNo, int noerror)

{

  TuiStatus ret = TUI_FAILURE;

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

    {

      register FILE *stream;

      register int i, desc, c, lineWidth, nlines;

      register char *srcLine = 0;

      if ((ret = tuiAllocSourceBuffer (srcWin)) == TUI_SUCCESS)

        {

          lineWidth = srcWin->generic.width - 1;

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

             the number of lines  */

          nlines = (lineNo + (srcWin->generic.height - 2)) - lineNo;

          desc = open_source_file (s);

          if (desc < 0)

            {

              if (!noerror)

                {

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

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

                  print_sys_errmsg (name, errno);

                }

              ret = TUI_FAILURE;

            }

          else

            {

              if (s->line_charpos == 0)

                find_source_lines (s, desc);

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

                {

                  close (desc);

                  printf_unfiltered (

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

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

                }

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

                {

                  close (desc);

                  perror_with_name (s->filename);

                }

              else

                {

                  register int offset, curLineNo, curLine, curLen, threshold;

                  TuiGenWinInfoPtr locator = locatorWinInfoPtr ();

                  TuiSourceInfoPtr src = &srcWin->detail.sourceInfo;

                  if (srcWin->generic.title)

                    xfree (srcWin->generic.title);

                  srcWin->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->horizontalOffset;

                  threshold = (lineWidth - 1) + offset;

                  stream = fdopen (desc, FOPEN_RT);

                  clearerr (stream);

                  curLine = 0;

                  curLineNo = src->startLineOrAddr.lineNo = lineNo;

                  if (offset > 0)

                    srcLine = (char *) xmalloc (

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

                  while (curLine < nlines)

                    {

                      TuiWinElementPtr element = (TuiWinElementPtr)

                      srcWin->generic.content[curLine];

                      /* get the first character in the line */

                      c = fgetc (stream);

                      if (offset == 0)

                        srcLine = ((TuiWinElementPtr)

                                   srcWin->generic.content[

                                        curLine])->whichElement.source.line;

                      /* Init the line with the line number */

                      sprintf (srcLine, "%-6d", curLineNo);

                      curLen = strlen (srcLine);

                      i = curLen -

                        ((curLen / tuiDefaultTabLen ()) * tuiDefaultTabLen ());

                      while (i < tuiDefaultTabLen ())

                        {

                          srcLine[curLen] = ' ';

                          i++;

                          curLen++;

                        }

                      srcLine[curLen] = (char) 0;

                      /* Set whether element is the execution point and

                         whether there is a break point on it.  */

                      element->whichElement.source.lineOrAddr.lineNo =

                        curLineNo;

                      element->whichElement.source.isExecPoint =

                        (strcmp (((TuiWinElementPtr)

                        locator->content[0])->whichElement.locator.fileName,

                                 s->filename) == 0

                         && curLineNo == ((TuiWinElementPtr)

                         locator->content[0])->whichElement.locator.lineNo);

                      if (c != EOF)

                        {

                          i = strlen (srcLine) - 1;

                          do

                            {

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

                                  (c != '\r') && (++i < threshold))

                                {

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

                                    {

                                      srcLine[i++] = '^';

                                      srcLine[i] = c + 0100;

                                    }

                                  else if (c == 0177)

                                    {

                                      srcLine[i++] = '^';

                                      srcLine[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, maxTabLen = tuiDefaultTabLen ();

                                          for (j = i - (

                                               (i / maxTabLen) * maxTabLen);

                                               ((j < maxTabLen) &&

                                                i < threshold);

                                               i++, j++)

                                            srcLine[i] = ' ';

                                          i--;

                                        }

                                      else

                                        srcLine[i] = c;

                                    }

                                  srcLine[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);

                                }

                            }

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

                                 i < threshold && (c = fgetc (stream)));

                        }

                      /* Now copy the line taking the offset into account */

                      if (strlen (srcLine) > offset)

                        strcpy (((TuiWinElementPtr) srcWin->generic.content[

                                        curLine])->whichElement.source.line,

                                &srcLine[offset]);

                      else

                        ((TuiWinElementPtr)

                         srcWin->generic.content[

                          curLine])->whichElement.source.line[0] = (char) 0;

                      curLine++;

                      curLineNo++;

                    }

                  if (offset > 0)

                    tuiFree (srcLine);

                  fclose (stream);

                  srcWin->generic.contentSize = 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

   tuiEraseSourceContents, which in turn is invoked when the source files

   cannot be accessed */

void

tuiSetSourceContentNil (TuiWinInfoPtr winInfo, char *warning_string)

{

  int lineWidth;

  int nLines;

  int curr_line = 0;

  lineWidth = winInfo->generic.width - 1;

  nLines = winInfo->generic.height - 2;

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

     which contains the message */

  while (curr_line < winInfo->generic.contentSize)

    {

      /* 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 */

      TuiWinElementPtr element =

      (TuiWinElementPtr) winInfo->generic.content[curr_line];

      element->whichElement.source.lineOrAddr.lineNo = 0;

      element->whichElement.source.isExecPoint = FALSE;

      element->whichElement.source.hasBreak = FALSE;

      /* set the contents of the line to blank */

      element->whichElement.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 tuiEraseSourceContent. We need to keep the screen and the

         window's actual contents in synch */

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

        {

          int i;

          int xpos;

          int warning_length = strlen (warning_string);

          char *srcLine;

          srcLine = element->whichElement.source.line;

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

            xpos = 1;

          else

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

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

            srcLine[i] = ' ';

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

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

            srcLine[i] = ' ';

          srcLine[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

tuiShowSource (struct symtab *s, TuiLineOrAddress line, int noerror)

{

  srcWin->detail.sourceInfo.horizontalOffset = 0;

  tuiUpdateSourceWindowAsIs(srcWin, s, line, noerror);

}

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

int

tuiSourceIsDisplayed (char *fname)

{

  return (srcWin->generic.contentInUse &&

          (strcmp (((TuiWinElementPtr) (locatorWinInfoPtr ())->

                  content[0])->whichElement.locator.fileName, fname) == 0));

}

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

void

tuiVerticalSourceScroll (TuiScrollDirection scrollDirection,

                         int numToScroll)

{

  if (srcWin->generic.content != (OpaquePtr) NULL)

    {

      TuiLineOrAddress l;

      struct symtab *s;

      TuiWinContent content = (TuiWinContent) srcWin->generic.content;

      if (current_source_symtab == (struct symtab *) NULL)

        s = find_pc_symtab (selected_frame->pc);

      else

        s = current_source_symtab;

      if (scrollDirection == FORWARD_SCROLL)

        {

          l.lineNo = content[0]->whichElement.source.lineOrAddr.lineNo +

            numToScroll;

          if (l.lineNo > s->nlines)

            /*line = s->nlines - winInfo->generic.contentSize + 1; */

            /*elz: fix for dts 23398 */

            l.lineNo = content[0]->whichElement.source.lineOrAddr.lineNo;

        }

      else

        {

          l.lineNo = content[0]->whichElement.source.lineOrAddr.lineNo -

            numToScroll;

          if (l.lineNo <= 0)

            l.lineNo = 1;

        }

      print_source_lines (s, l.lineNo, l.lineNo + 1, 0);

    }

}