projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 2c7129ee EW |
1 | #ifndef lint |
| 2 | static char *sccsid = "@(#)wwinsline.c 3.1 83/08/09"; | |
| 3 | #endif | |
| 4 | ||
| 5 | #include "ww.h" | |
| 6 | ||
| 7 | wwinsline(w, line) | |
| 8 | register struct ww *w; | |
| 9 | int line; | |
| 10 | { | |
| 11 | register i; | |
| 12 | int j; | |
| 13 | int row = line - w->ww_scroll; | |
| 14 | int srow = MAX(row, 0) + w->ww_w.t; | |
| 15 | int startrow, endrow; | |
| 16 | int nvis; | |
| 17 | int nvismax; | |
| 18 | int deleted = 0; | |
| 19 | ||
| 20 | /* | |
| 21 | * Fix the buffer. | |
| 22 | * But leave clearing the first line for wwclreol(). | |
| 23 | */ | |
| 24 | { | |
| 25 | register union ww_char *tmp; | |
| 26 | register union ww_char **cpp, **cqq; | |
| 27 | cpp = &w->ww_buf[w->ww_nline]; | |
| 28 | cqq = cpp - 1; | |
| 29 | tmp = *cqq; | |
| 30 | for (i = w->ww_nline - line - 1; --i >= 0;) | |
| 31 | *--cpp = *--cqq; | |
| 32 | *cqq = tmp; | |
| 33 | } | |
| 34 | /* | |
| 35 | * See how many lines on the screen are affected. | |
| 36 | */ | |
| 37 | for (i = MAX(0, row); i < w->ww_w.nr && w->ww_nvis[i] == 0; i++) | |
| 38 | ; | |
| 39 | if ((startrow = i + w->ww_w.t) == w->ww_w.b) { | |
| 40 | endrow = startrow - 1; | |
| 41 | goto out; | |
| 42 | } | |
| 43 | for (i = w->ww_w.nr - 1; i > 0 && w->ww_nvis[i] == 0; i--) | |
| 44 | ; | |
| 45 | if ((endrow = i + w->ww_w.t) == startrow) | |
| 46 | goto out; /* just one line is easy */ | |
| 47 | /* | |
| 48 | * See how much of this window is visible. | |
| 49 | */ | |
| 50 | nvismax = wwncol * (endrow - startrow + 1); | |
| 51 | nvis = 0; | |
| 52 | for (i = startrow; i <= endrow; i++) | |
| 53 | nvis += w->ww_nvis[i]; | |
| 54 | /* | |
| 55 | * If it's a good idea to use delete and insert line | |
| 56 | * and the terminal can, then do it. | |
| 57 | */ | |
| 58 | if (endrow > startrow && nvis > nvismax / 2 | |
| 59 | && tt.tt_delline && tt.tt_insline) { | |
| 60 | register union ww_char *tmp; | |
| 61 | register union ww_char **cpp, **cqq; | |
| 62 | ||
| 63 | (*tt.tt_move)(startrow, 0); | |
| 64 | (*tt.tt_delline)(); | |
| 65 | if (endrow != wwnrow - 1) { | |
| 66 | (*tt.tt_move)(endrow, 0); | |
| 67 | (*tt.tt_insline)(); | |
| 68 | } | |
| 69 | /* | |
| 70 | * Fix up the old screen. | |
| 71 | */ | |
| 72 | cpp = &wwos[startrow]; | |
| 73 | cqq = cpp + 1; | |
| 74 | tmp = *cpp; | |
| 75 | for (i = endrow - startrow; --i >= 0;) | |
| 76 | *cpp++ = *cqq++; | |
| 77 | *cpp = tmp; | |
| 78 | for (i = wwncol; --i >= 0;) | |
| 79 | tmp++->c_w = ' '; | |
| 80 | deleted++; | |
| 81 | } | |
| 82 | /* | |
| 83 | * Fix the new screen. | |
| 84 | */ | |
| 85 | if (endrow > startrow && nvis == nvismax) { | |
| 86 | register union ww_char *tmp; | |
| 87 | register union ww_char **cpp, **cqq; | |
| 88 | ||
| 89 | cpp = &wwns[startrow]; | |
| 90 | cqq = cpp + 1; | |
| 91 | tmp = *cpp; | |
| 92 | for (i = endrow - startrow; --i >= 0;) | |
| 93 | *cpp++ = *cqq; | |
| 94 | *cpp = tmp; | |
| 95 | i = startrow - 1; | |
| 96 | } else { | |
| 97 | out: | |
| 98 | /* wwclreol() will do the last line */ | |
| 99 | if ((i = endrow) == w->ww_nline - w->ww_scroll + w->ww_w.t - 1) | |
| 100 | i--; | |
| 101 | } | |
| 102 | for (; i >= srow; i--) { | |
| 103 | register char *smap; | |
| 104 | register union ww_char *buf; | |
| 105 | register char *win; | |
| 106 | register union ww_char *ns; | |
| 107 | ||
| 108 | ns = &wwns[i][w->ww_w.l]; | |
| 109 | smap = &wwsmap[i][w->ww_w.l]; | |
| 110 | buf = w->ww_buf[w->ww_scroll + i - w->ww_w.t]; | |
| 111 | win = w->ww_win[i - w->ww_w.t]; | |
| 112 | for (j = w->ww_w.nc; --j >= 0;) | |
| 113 | if (*smap++ != w->ww_index) | |
| 114 | win++, ns++, buf++; | |
| 115 | else | |
| 116 | ns++->c_w = buf++->c_w | |
| 117 | ^ *win++ << WWC_MSHIFT; | |
| 118 | } | |
| 119 | wwclreol(w, w->ww_nline - 1, 0, deleted); | |
| 120 | } |