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d0aeaf5a DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
f9ac90b4 KB |
3 | * All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
b36fc510 KB |
6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
d0aeaf5a DF |
16 | */ |
17 | ||
963ce42e | 18 | #ifndef lint |
b36fc510 | 19 | static char sccsid[] = "@(#)display.c 5.3 (Berkeley) %G%"; |
f9ac90b4 | 20 | #endif /* not lint */ |
a07b5a38 | 21 | |
963ce42e MK |
22 | /* |
23 | * The window 'manager', initializes curses and handles the actual | |
a07b5a38 MK |
24 | * displaying of text |
25 | */ | |
a07b5a38 MK |
26 | #include "talk.h" |
27 | ||
963ce42e MK |
28 | xwin_t my_win; |
29 | xwin_t his_win; | |
30 | WINDOW *line_win; | |
a07b5a38 | 31 | |
963ce42e | 32 | int curses_initialized = 0; |
a07b5a38 | 33 | |
963ce42e MK |
34 | /* |
35 | * max HAS to be a function, it is called with | |
36 | * a argument of the form --foo at least once. | |
37 | */ | |
a07b5a38 | 38 | max(a,b) |
963ce42e | 39 | int a, b; |
a07b5a38 | 40 | { |
963ce42e MK |
41 | |
42 | return (a > b ? a : b); | |
a07b5a38 MK |
43 | } |
44 | ||
45 | /* | |
46 | * Display some text on somebody's window, processing some control | |
47 | * characters while we are at it. | |
48 | */ | |
a07b5a38 | 49 | display(win, text, size) |
963ce42e MK |
50 | register xwin_t *win; |
51 | register char *text; | |
52 | int size; | |
a07b5a38 | 53 | { |
963ce42e MK |
54 | register int i; |
55 | char cch; | |
56 | ||
57 | for (i = 0; i < size; i++) { | |
58 | if (*text == '\n') { | |
59 | xscroll(win, 0); | |
60 | text++; | |
61 | continue; | |
62 | } | |
63 | /* erase character */ | |
64 | if (*text == win->cerase) { | |
65 | wmove(win->x_win, win->x_line, max(--win->x_col, 0)); | |
66 | getyx(win->x_win, win->x_line, win->x_col); | |
67 | waddch(win->x_win, ' '); | |
68 | wmove(win->x_win, win->x_line, win->x_col); | |
69 | getyx(win->x_win, win->x_line, win->x_col); | |
70 | text++; | |
71 | continue; | |
72 | } | |
73 | /* | |
74 | * On word erase search backwards until we find | |
75 | * the beginning of a word or the beginning of | |
76 | * the line. | |
77 | */ | |
78 | if (*text == win->werase) { | |
79 | int endcol, xcol, i, c; | |
80 | ||
81 | endcol = win->x_col; | |
82 | xcol = endcol - 1; | |
83 | while (xcol >= 0) { | |
84 | c = readwin(win->x_win, win->x_line, xcol); | |
85 | if (c != ' ') | |
86 | break; | |
87 | xcol--; | |
88 | } | |
89 | while (xcol >= 0) { | |
90 | c = readwin(win->x_win, win->x_line, xcol); | |
91 | if (c == ' ') | |
92 | break; | |
93 | xcol--; | |
94 | } | |
95 | wmove(win->x_win, win->x_line, xcol + 1); | |
96 | for (i = xcol + 1; i < endcol; i++) | |
97 | waddch(win->x_win, ' '); | |
98 | wmove(win->x_win, win->x_line, xcol + 1); | |
99 | getyx(win->x_win, win->x_line, win->x_col); | |
100 | continue; | |
101 | } | |
102 | /* line kill */ | |
103 | if (*text == win->kill) { | |
104 | wmove(win->x_win, win->x_line, 0); | |
105 | wclrtoeol(win->x_win); | |
106 | getyx(win->x_win, win->x_line, win->x_col); | |
107 | text++; | |
108 | continue; | |
109 | } | |
110 | if (*text == '\f') { | |
111 | if (win == &my_win) | |
112 | wrefresh(curscr); | |
113 | text++; | |
114 | continue; | |
115 | } | |
116 | if (win->x_col == COLS-1) { | |
117 | /* check for wraparound */ | |
118 | xscroll(win, 0); | |
119 | } | |
120 | if (*text < ' ' && *text != '\t') { | |
121 | waddch(win->x_win, '^'); | |
122 | getyx(win->x_win, win->x_line, win->x_col); | |
123 | if (win->x_col == COLS-1) /* check for wraparound */ | |
124 | xscroll(win, 0); | |
125 | cch = (*text & 63) + 64; | |
126 | waddch(win->x_win, cch); | |
127 | } else | |
128 | waddch(win->x_win, *text); | |
129 | getyx(win->x_win, win->x_line, win->x_col); | |
130 | text++; | |
a07b5a38 | 131 | } |
963ce42e | 132 | wrefresh(win->x_win); |
a07b5a38 MK |
133 | } |
134 | ||
135 | /* | |
963ce42e MK |
136 | * Read the character at the indicated position in win |
137 | */ | |
a07b5a38 | 138 | readwin(win, line, col) |
963ce42e | 139 | WINDOW *win; |
a07b5a38 | 140 | { |
963ce42e MK |
141 | int oldline, oldcol; |
142 | register int c; | |
143 | ||
144 | getyx(win, oldline, oldcol); | |
145 | wmove(win, line, col); | |
146 | c = winch(win); | |
147 | wmove(win, oldline, oldcol); | |
148 | return (c); | |
a07b5a38 MK |
149 | } |
150 | ||
151 | /* | |
963ce42e MK |
152 | * Scroll a window, blanking out the line following the current line |
153 | * so that the current position is obvious | |
154 | */ | |
a07b5a38 | 155 | xscroll(win, flag) |
963ce42e MK |
156 | register xwin_t *win; |
157 | int flag; | |
a07b5a38 | 158 | { |
963ce42e MK |
159 | |
160 | if (flag == -1) { | |
161 | wmove(win->x_win, 0, 0); | |
162 | win->x_line = 0; | |
163 | win->x_col = 0; | |
164 | return; | |
165 | } | |
166 | win->x_line = (win->x_line + 1) % win->x_nlines; | |
a07b5a38 | 167 | win->x_col = 0; |
963ce42e MK |
168 | wmove(win->x_win, win->x_line, win->x_col); |
169 | wclrtoeol(win->x_win); | |
170 | wmove(win->x_win, (win->x_line + 1) % win->x_nlines, win->x_col); | |
171 | wclrtoeol(win->x_win); | |
172 | wmove(win->x_win, win->x_line, win->x_col); | |
a07b5a38 | 173 | } |