IABSD.fr/xenocara/app/xterm/scrollback.c

Branch : - branch - master - tag -

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  Commit

• Author : matthieu
  Date : 2019-12-29 08:54:02
  Hash : 150aa6e9
  Message : Update to xterm 351. tested and ok solene@ jca@

• app/xterm/scrollback.c

• /* $XTermId: scrollback.c,v 1.19 2019/06/30 19:10:00 tom Exp $ */
  
  /*
   * Copyright 2009-2016,2019 by Thomas E. Dickey
   *
   *                         All Rights Reserved
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the
   * "Software"), to deal in the Software without restriction, including
   * without limitation the rights to use, copy, modify, merge, publish,
   * distribute, sublicense, and/or sell copies of the Software, and to
   * permit persons to whom the Software is furnished to do so, subject to
   * the following conditions:
   *
   * The above copyright notice and this permission notice shall be included
   * in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
   * IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
   * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
   * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
   * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   *
   * Except as contained in this notice, the name(s) of the above copyright
   * holders shall not be used in advertising or otherwise to promote the
   * sale, use or other dealings in this Software without prior written
   * authorization.
   */
  
  #include <xterm.h>
  
  #define REAL_ROW(screen, row) ((row) + (screen)->saved_fifo)
  #define ROW2FIFO(screen, row) \
  	(unsigned) (REAL_ROW(screen, row) % (screen)->savelines)
  
  /*
   * Given a row-number, find the corresponding data for the line in the VT100
   * widget's saved-line FIFO.  The row-number (from getLineData) is negative.
   * So we just count backwards from the last saved line.
   */
  LineData *
  getScrollback(TScreen *screen, int row)
  {
      LineData *result = 0;
  
      if (screen->saved_fifo > 0 && REAL_ROW(screen, row) >= 0) {
  	unsigned which = ROW2FIFO(screen, row);
  	ScrnBuf where = scrnHeadAddr(screen, screen->saveBuf_index, which);
  	result = (LineData *) where;
      }
  
      TRACE(("getScrollback %d -> %d -> %p\n",
  	   row, ROW2FIFO(screen, row),
  	   (void *) result));
      return result;
  }
  
  /*
   * Allocate a new row in the scrollback FIFO, returning a pointer to it.
   */
  LineData *
  addScrollback(TScreen *screen)
  {
      ScrnBuf where = 0;
      unsigned ncols = (unsigned) MaxCols(screen);
  
      if (screen->saveBuf_index != 0 && screen->savelines != 0) {
  	unsigned which;
  	Char *block;
  
  	TRACE(("addScrollback %lu\n", screen->saved_fifo));
  
  	/* first, see which index we'll use */
  	which = (unsigned) (screen->saved_fifo % screen->savelines);
  	where = scrnHeadAddr(screen, screen->saveBuf_index, which);
  
  	/* discard any obsolete index data */
  	if (screen->saved_fifo > screen->savelines) {
  	    LineData *prior = (LineData *) where;
  	    /*
  	     * setupLineData uses the attribs as the first address used from the
  	     * data block.
  	     */
  	    if (prior->attribs != 0) {
  		TRACE(("...freeing prior FIFO data in slot %d: %p->%p\n",
  		       which, (void *) prior, (void *) prior->attribs));
  		free(prior->attribs);
  		prior->attribs = 0;
  	    }
  	    if (screen->saved_fifo > 2 * screen->savelines) {
  		screen->saved_fifo -= screen->savelines;
  	    }
  	}
  
  	/* allocate the new data */
  	block = allocScrnData(screen, 1, ncols);
  
  	/* record the new data in the index */
  	setupLineData(screen, where, (Char *) block, 1, ncols);
  
  	TRACE(("...storing new FIFO data in slot %d: %p->%p\n",
  	       which, (void *) where, block));
  
  	screen->saved_fifo++;
      }
      return (LineData *) where;
  }
  
  void
  deleteScrollback(TScreen *screen)
  {
      unsigned which = ROW2FIFO(screen, -1);
      ScrnBuf where = scrnHeadAddr(screen, screen->saveBuf_index, which);
      LineData *prior = (LineData *) where;
      /*
       * setupLineData uses the attribs as the first address used from the
       * data block.
       */
      if (prior->attribs != 0) {
  	TRACE(("...freeing prior FIFO data in slot %d: %p->%p\n",
  	       which, (void *) prior, (void *) prior->attribs));
  	free(prior->attribs);
  	prior->attribs = 0;
      }
      screen->saved_fifo--;
  }