| | 1 | #ifndef lint |
| | 2 | static char sccsid[] = "@(#)wwclreol.c 3.14 %G%"; |
| | 3 | #endif |
| | 4 | |
| | 5 | /* |
| | 6 | * Copyright (c) 1983 Regents of the University of California, |
| | 7 | * All rights reserved. Redistribution permitted subject to |
| | 8 | * the terms of the Berkeley Software License Agreement. |
| | 9 | */ |
| | 10 | |
| | 11 | #include "ww.h" |
| | 12 | #include "tt.h" |
| | 13 | |
| | 14 | /* |
| | 15 | * Clear w to the end of line. |
| | 16 | * If cleared is true, then the screen line has already been cleared |
| | 17 | * previously. |
| | 18 | */ |
| | 19 | wwclreol1(w, row, col, cleared) |
| | 20 | register struct ww *w; |
| | 21 | int row, col; |
| | 22 | char cleared; |
| | 23 | { |
| | 24 | register i; |
| | 25 | int gain; |
| | 26 | |
| | 27 | /* |
| | 28 | * Clear the buffer right off |
| | 29 | */ |
| | 30 | { |
| | 31 | register union ww_char *buf; |
| | 32 | |
| | 33 | buf = &w->ww_buf[row][col]; |
| | 34 | for (i = w->ww_b.r - col; --i >= 0;) |
| | 35 | buf++->c_w = ' '; |
| | 36 | } |
| | 37 | |
| | 38 | /* |
| | 39 | * If can't see it, just return. |
| | 40 | */ |
| | 41 | if (row < w->ww_i.t || row >= w->ww_i.b |
| | 42 | || w->ww_i.r <= 0 || w->ww_i.r <= col) |
| | 43 | return; |
| | 44 | |
| | 45 | if (col < w->ww_i.l) |
| | 46 | col = w->ww_i.l; |
| | 47 | |
| | 48 | /* |
| | 49 | * Now find out how much is actually cleared, and fix wwns. |
| | 50 | */ |
| | 51 | if (cleared) { |
| | 52 | register union ww_char *s; |
| | 53 | register char *smap, *win; |
| | 54 | |
| | 55 | i = col; |
| | 56 | smap = &wwsmap[row][i]; |
| | 57 | s = &wwns[row][i]; |
| | 58 | win = &w->ww_win[row][i]; |
| | 59 | for (i = w->ww_i.r - i; --i >= 0;) { |
| | 60 | if (*smap++ != w->ww_index) |
| | 61 | continue; |
| | 62 | s++->c_w = ' ' | *win++ << WWC_MSHIFT; |
| | 63 | } |
| | 64 | } else { |
| | 65 | register union ww_char *s; |
| | 66 | register char *smap, *win; |
| | 67 | int ntouched = 0; |
| | 68 | |
| | 69 | i = col; |
| | 70 | smap = &wwsmap[row][i]; |
| | 71 | s = wwns[row]; |
| | 72 | win = w->ww_win[row]; |
| | 73 | gain = 0; |
| | 74 | for (; i < w->ww_i.r; i++) { |
| | 75 | if (*smap++ != w->ww_index) { |
| | 76 | if (s[i].c_w != ' ') |
| | 77 | gain--; |
| | 78 | } else if (win[i] == 0) { |
| | 79 | if (s[i].c_w != ' ') { |
| | 80 | gain++; |
| | 81 | ntouched++; |
| | 82 | s[i].c_w = ' '; |
| | 83 | } |
| | 84 | } else { |
| | 85 | short c = ' ' | win[i] << WWC_MSHIFT; |
| | 86 | if (s[i].c_w == c) |
| | 87 | gain--; |
| | 88 | else { |
| | 89 | s[i].c_w = c; |
| | 90 | ntouched++; |
| | 91 | } |
| | 92 | } |
| | 93 | } |
| | 94 | s += i; |
| | 95 | for (i = wwncol - i; --i >= 0;) |
| | 96 | if (s++->c_w != ' ') |
| | 97 | gain--; |
| | 98 | if (ntouched > 0) |
| | 99 | wwtouched[row] |= WWU_TOUCHED; |
| | 100 | } |
| | 101 | |
| | 102 | /* |
| | 103 | * Can/Should we use clear eol? |
| | 104 | */ |
| | 105 | if (!cleared && tt.tt_clreol != 0 && gain > 4) { |
| | 106 | register union ww_char *s; |
| | 107 | |
| | 108 | /* clear to the end */ |
| | 109 | (*tt.tt_move)(row, col); |
| | 110 | (*tt.tt_clreol)(); |
| | 111 | s = &wwos[row][col]; |
| | 112 | for (i = wwncol - col; --i >= 0;) |
| | 113 | s++->c_w = ' '; |
| | 114 | } |
| | 115 | } |
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