Commit | Line | Data |
---|---|---|
bbb8329f | 1 | #ifndef lint |
2bb24b34 | 2 | static char sccsid[] = "@(#)wwupdate.c 3.15 %G%"; |
bbb8329f EW |
3 | #endif |
4 | ||
5 | #include "ww.h" | |
e908bfac | 6 | #include "tt.h" |
bbb8329f | 7 | |
b1189050 | 8 | wwupdate1(top, bot) |
bbb8329f | 9 | { |
b7f39bc5 EW |
10 | int i; |
11 | register j; | |
bbb8329f | 12 | register union ww_char *ns, *os; |
b7f39bc5 | 13 | char *touched; |
6e3b31ff | 14 | char didit; |
bbb8329f | 15 | |
861cd1ed | 16 | wwnupdate++; |
b1189050 EW |
17 | for (i = top, touched = &wwtouched[i]; i < bot && !wwinterrupt(); |
18 | i++, touched++) { | |
861cd1ed EW |
19 | if (!*touched) |
20 | continue; | |
6e3b31ff EW |
21 | if (*touched & WWU_MAJOR && tt.tt_clreol != 0) { |
22 | register gain = 0; | |
23 | register best_gain = 0; | |
24 | register best; | |
b7f39bc5 | 25 | |
04d70db4 EW |
26 | wwnmajline++; |
27 | j = wwncol; | |
6e3b31ff EW |
28 | ns = &wwns[i][j]; |
29 | os = &wwos[i][j]; | |
04d70db4 | 30 | while (--j >= 0) { |
6e3b31ff EW |
31 | /* |
32 | * The cost of clearing is: | |
33 | * ncol - nblank + X | |
34 | * The cost of straight update is: | |
35 | * ncol - nsame | |
36 | * We clear if: nblank - nsame > X | |
37 | * X is the clreol overhead. | |
38 | * So we make gain = nblank - nsame. | |
39 | */ | |
40 | if ((--ns)->c_w == (--os)->c_w) | |
41 | gain--; | |
42 | else | |
43 | best_gain--; | |
44 | if (ns->c_w == ' ') | |
45 | gain++; | |
46 | if (gain >= best_gain) { | |
47 | best = j; | |
48 | best_gain = gain; | |
49 | } | |
04d70db4 | 50 | } |
6e3b31ff EW |
51 | if (best_gain > 4) { |
52 | (*tt.tt_move)(i, best); | |
04d70db4 | 53 | (*tt.tt_clreol)(); |
6e3b31ff EW |
54 | for (j = wwncol - best, os = &wwos[i][best]; |
55 | --j >= 0;) | |
04d70db4 EW |
56 | os++->c_w = ' '; |
57 | } else | |
58 | wwnmajmiss++; | |
59 | } | |
2b19684f | 60 | *touched = 0; |
04d70db4 EW |
61 | wwnupdline++; |
62 | didit = 0; | |
bbb8329f EW |
63 | ns = wwns[i]; |
64 | os = wwos[i]; | |
b7f39bc5 | 65 | for (j = 0; j < wwncol;) { |
6e3b31ff EW |
66 | register char *p, *q; |
67 | char m; | |
68 | int c; | |
69 | register n; | |
70 | char buf[512]; /* > wwncol */ | |
71 | union ww_char lastc; | |
72 | ||
b7f39bc5 EW |
73 | for (; j++ < wwncol && ns++->c_w == os++->c_w;) |
74 | ; | |
75 | if (j > wwncol) | |
76 | break; | |
77 | p = buf; | |
3130283e | 78 | m = ns[-1].c_m & tt.tt_availmodes; |
b7f39bc5 EW |
79 | c = j - 1; |
80 | os[-1] = ns[-1]; | |
81 | *p++ = ns[-1].c_c; | |
6e3b31ff | 82 | n = 5; |
b7f39bc5 | 83 | q = p; |
3130283e | 84 | while (j < wwncol && (ns->c_m&tt.tt_availmodes) == m) { |
b7f39bc5 EW |
85 | *p++ = ns->c_c; |
86 | if (ns->c_w == os->c_w) { | |
6e3b31ff | 87 | if (--n <= 0) |
b7f39bc5 EW |
88 | break; |
89 | os++; | |
90 | ns++; | |
91 | } else { | |
6e3b31ff | 92 | n = 5; |
b7f39bc5 | 93 | q = p; |
5e785082 | 94 | lastc = *os; |
b7f39bc5 EW |
95 | *os++ = *ns++; |
96 | } | |
97 | j++; | |
bbb8329f | 98 | } |
3130283e | 99 | tt.tt_nmodes = m; |
5e785082 EW |
100 | if (wwwrap |
101 | && i == wwnrow - 1 && q - buf + c == wwncol) { | |
3130283e | 102 | if (tt.tt_hasinsert) { |
594208de EW |
103 | if (q - buf != 1) { |
104 | (*tt.tt_move)(i, c); | |
105 | (*tt.tt_write)(buf + 1, | |
106 | q - buf - 1); | |
107 | (*tt.tt_move)(i, c); | |
108 | tt.tt_ninsert = 1; | |
109 | (*tt.tt_write)(buf, 1); | |
110 | tt.tt_ninsert = 0; | |
111 | } else { | |
112 | (*tt.tt_move)(i, c - 1); | |
113 | (*tt.tt_write)(buf, 1); | |
114 | tt.tt_nmodes = ns[-2].c_m; | |
115 | (*tt.tt_move)(i, c - 1); | |
116 | tt.tt_ninsert = 1; | |
117 | (*tt.tt_write)(&ns[-2].c_c, 1); | |
118 | tt.tt_ninsert = 0; | |
119 | } | |
5e785082 | 120 | } else { |
2bb24b34 EW |
121 | if (q - buf > 1) { |
122 | (*tt.tt_move)(i, c); | |
123 | (*tt.tt_write)(buf, q-buf-1); | |
124 | } | |
2b19684f EW |
125 | os[-1] = lastc; |
126 | *touched = WWU_TOUCHED; | |
5e785082 | 127 | } |
594208de EW |
128 | } else { |
129 | (*tt.tt_move)(i, c); | |
3130283e | 130 | (*tt.tt_write)(buf, q - buf); |
594208de | 131 | } |
b7f39bc5 | 132 | didit++; |
bbb8329f | 133 | } |
861cd1ed | 134 | if (!didit) |
04d70db4 | 135 | wwnupdmiss++; |
bbb8329f EW |
136 | } |
137 | } |