129 lines
4.1 KiB
C
129 lines
4.1 KiB
C
/* $XTermId: scrollback.c,v 1.17 2014/05/11 14:08:11 tom Exp $ */
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/*
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* Copyright 2009-2013,2014 by Thomas E. Dickey
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*
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* All Rights Reserved
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name(s) of the above copyright
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* holders shall not be used in advertising or otherwise to promote the
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* sale, use or other dealings in this Software without prior written
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* authorization.
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*/
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#include <xterm.h>
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#define REAL_ROW(screen, row) ((row) + (screen)->saved_fifo)
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#define ROW2FIFO(screen, row) \
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(unsigned) (REAL_ROW(screen, row) % (screen)->savelines)
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/*
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* Given a row-number, find the corresponding data for the line in the VT100
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* widget's saved-line FIFO. The row-number (from getLineData) is negative.
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* So we just count backwards from the last saved line.
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*/
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LineData *
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getScrollback(TScreen *screen, int row)
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{
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LineData *result = 0;
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if (screen->saved_fifo > 0 && REAL_ROW(screen, row) >= 0) {
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unsigned which = ROW2FIFO(screen, row);
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ScrnBuf where = scrnHeadAddr(screen, screen->saveBuf_index, which);
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result = (LineData *) where;
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}
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TRACE(("getScrollback %d -> %d -> %p\n",
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row, ROW2FIFO(screen, row),
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(void *) result));
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return result;
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}
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/*
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* Allocate a new row in the scrollback FIFO, returning a pointer to it.
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*/
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LineData *
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addScrollback(TScreen *screen)
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{
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ScrnBuf where = 0;
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unsigned which;
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unsigned ncols = (unsigned) MaxCols(screen);
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Char *block;
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if (screen->saveBuf_index != 0) {
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TRACE(("addScrollback %lu\n", screen->saved_fifo));
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/* first, see which index we'll use */
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which = (unsigned) (screen->saved_fifo % screen->savelines);
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where = scrnHeadAddr(screen, screen->saveBuf_index, which);
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/* discard any obsolete index data */
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if (screen->saved_fifo > screen->savelines) {
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LineData *prior = (LineData *) where;
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/*
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* setupLineData uses the attribs as the first address used from the
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* data block.
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*/
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if (prior->attribs != 0) {
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TRACE(("...freeing prior FIFO data in slot %d: %p->%p\n",
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which, (void *) prior, (void *) prior->attribs));
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free(prior->attribs);
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prior->attribs = 0;
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}
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if (screen->saved_fifo > 2 * screen->savelines) {
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screen->saved_fifo -= screen->savelines;
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}
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}
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/* allocate the new data */
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block = allocScrnData(screen, 1, ncols);
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/* record the new data in the index */
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setupLineData(screen, where, (Char *) block, 1, ncols);
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TRACE(("...storing new FIFO data in slot %d: %p->%p\n",
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which, (void *) where, block));
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screen->saved_fifo++;
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}
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return (LineData *) where;
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}
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void
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deleteScrollback(TScreen *screen)
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{
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unsigned which = ROW2FIFO(screen, -1);
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ScrnBuf where = scrnHeadAddr(screen, screen->saveBuf_index, which);
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LineData *prior = (LineData *) where;
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/*
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* setupLineData uses the attribs as the first address used from the
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* data block.
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*/
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if (prior->attribs != 0) {
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TRACE(("...freeing prior FIFO data in slot %d: %p->%p\n",
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which, (void *) prior, (void *) prior->attribs));
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free(prior->attribs);
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prior->attribs = 0;
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}
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screen->saved_fifo--;
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}
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