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1.1 root 1: /*
2: * Copyright (c) 1983 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms are permitted
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.
16: */
17:
18: #ifndef lint
19: static char sccsid[] = "@(#)display.c 5.3 (Berkeley) 6/29/88";
20: #endif /* not lint */
21:
22: /*
23: * The window 'manager', initializes curses and handles the actual
24: * displaying of text
25: */
26: #include "talk.h"
27:
28: xwin_t my_win;
29: xwin_t his_win;
30: WINDOW *line_win;
31:
32: int curses_initialized = 0;
33:
34: /*
35: * max HAS to be a function, it is called with
36: * a argument of the form --foo at least once.
37: */
38: max(a,b)
39: int a, b;
40: {
41:
42: return (a > b ? a : b);
43: }
44:
45: /*
46: * Display some text on somebody's window, processing some control
47: * characters while we are at it.
48: */
49: display(win, text, size)
50: register xwin_t *win;
51: register char *text;
52: int size;
53: {
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++;
131: }
132: wrefresh(win->x_win);
133: }
134:
135: /*
136: * Read the character at the indicated position in win
137: */
138: readwin(win, line, col)
139: WINDOW *win;
140: {
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);
149: }
150:
151: /*
152: * Scroll a window, blanking out the line following the current line
153: * so that the current position is obvious
154: */
155: xscroll(win, flag)
156: register xwin_t *win;
157: int flag;
158: {
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;
167: win->x_col = 0;
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);
173: }
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