diff options
Diffstat (limited to 'usr.bin/window/wwdelchar.c')
-rw-r--r-- | usr.bin/window/wwdelchar.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/usr.bin/window/wwdelchar.c b/usr.bin/window/wwdelchar.c new file mode 100644 index 0000000..cd58833 --- /dev/null +++ b/usr.bin/window/wwdelchar.c @@ -0,0 +1,123 @@ +/* + * Copyright (c) 1983, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Edward Wang at The University of California, Berkeley. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char sccsid[] = "@(#)wwdelchar.c 8.1 (Berkeley) 6/6/93"; +#endif /* not lint */ + +#include "ww.h" +#include "tt.h" + +wwdelchar(w, row, col) +register struct ww *w; +{ + register i; + int nvis; + + /* + * First, shift the line. + */ + { + register union ww_char *p, *q; + + p = &w->ww_buf[row][col]; + q = p + 1; + for (i = w->ww_b.r - col; --i > 0;) + *p++ = *q++; + p->c_w = ' '; + } + + /* + * If can't see it, just return. + */ + if (row < w->ww_i.t || row >= w->ww_i.b + || w->ww_i.r <= 0 || w->ww_i.r <= col) + return; + + if (col < w->ww_i.l) + col = w->ww_i.l; + + /* + * Now find out how much is actually changed, and fix wwns. + */ + { + register union ww_char *buf; + register char *win; + register union ww_char *ns; + register char *smap; + char touched; + + nvis = 0; + smap = &wwsmap[row][col]; + for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++) + ; + if (i >= w->ww_i.r) + return; + col = i; + buf = w->ww_buf[row]; + win = w->ww_win[row]; + ns = wwns[row]; + smap = &wwsmap[row][i]; + touched = wwtouched[row]; + for (; i < w->ww_i.r; i++) { + if (*smap++ != w->ww_index) + continue; + touched |= WWU_TOUCHED; + if (win[i]) + ns[i].c_w = + buf[i].c_w ^ win[i] << WWC_MSHIFT; + else { + nvis++; + ns[i] = buf[i]; + } + } + wwtouched[row] = touched; + } + + /* + * Can/Should we use delete character? + */ + if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) { + register union ww_char *p, *q; + + xxdelchar(row, col); + p = &wwos[row][col]; + q = p + 1; + for (i = wwncol - col; --i > 0;) + *p++ = *q++; + p->c_w = ' '; + } +} |