Annotation of src/usr.bin/talk/display.c, Revision 1.17
1.17 ! deraadt 1: /* $OpenBSD: display.c,v 1.16 2010/08/12 23:31:29 tedu Exp $ */
1.1 deraadt 2: /* $NetBSD: display.c,v 1.3 1994/12/09 02:14:13 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1983, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
1.13 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: /*
34: * The window 'manager', initializes curses and handles the actual
35: * displaying of text
36: */
37: #include "talk.h"
1.3 deraadt 38: #include <ctype.h>
1.1 deraadt 39:
40: xwin_t my_win;
41: xwin_t his_win;
42: WINDOW *line_win;
43:
1.16 tedu 44: int curses_initialized;
45: int high_print;
46: bool smooth_scroll;
1.1 deraadt 47:
48: /*
49: * max HAS to be a function, it is called with
1.16 tedu 50: * an argument of the form --foo at least once.
1.1 deraadt 51: */
1.5 pjanzen 52: int
1.16 tedu 53: max(int a, int b)
1.1 deraadt 54: {
55:
56: return (a > b ? a : b);
57: }
58:
59: /*
60: * Display some text on somebody's window, processing some control
61: * characters while we are at it.
62: */
1.5 pjanzen 63: void
1.16 tedu 64: display(xwin_t *win, char *text, int size)
1.1 deraadt 65: {
1.9 mpech 66: int i;
1.1 deraadt 67: char cch;
68:
69: for (i = 0; i < size; i++) {
1.6 millert 70: /*
71: * Since we do not use curses's input routines we must
72: * convert '\r' -> '\n' ourselves.
73: */
74: if (*text == '\r')
75: *text = '\n';
76: if (*text == '\n') {
1.1 deraadt 77: xscroll(win, 0);
78: text++;
79: continue;
80: }
81: /* erase character */
82: if (*text == win->cerase) {
83: wmove(win->x_win, win->x_line, max(--win->x_col, 0));
84: getyx(win->x_win, win->x_line, win->x_col);
85: waddch(win->x_win, ' ');
86: wmove(win->x_win, win->x_line, win->x_col);
87: getyx(win->x_win, win->x_line, win->x_col);
88: text++;
89: continue;
90: }
91: /*
92: * On word erase search backwards until we find
93: * the beginning of a word or the beginning of
94: * the line.
95: */
96: if (*text == win->werase) {
97: int endcol, xcol, i, c;
98:
99: endcol = win->x_col;
100: xcol = endcol - 1;
101: while (xcol >= 0) {
102: c = readwin(win->x_win, win->x_line, xcol);
103: if (c != ' ')
104: break;
105: xcol--;
106: }
107: while (xcol >= 0) {
108: c = readwin(win->x_win, win->x_line, xcol);
109: if (c == ' ')
110: break;
111: xcol--;
112: }
113: wmove(win->x_win, win->x_line, xcol + 1);
114: for (i = xcol + 1; i < endcol; i++)
115: waddch(win->x_win, ' ');
116: wmove(win->x_win, win->x_line, xcol + 1);
117: getyx(win->x_win, win->x_line, win->x_col);
118: text++;
119: continue;
120: }
121: /* line kill */
122: if (*text == win->kill) {
123: wmove(win->x_win, win->x_line, 0);
124: wclrtoeol(win->x_win);
125: getyx(win->x_win, win->x_line, win->x_col);
126: text++;
127: continue;
128: }
129: if (*text == '\f') {
130: if (win == &my_win)
131: wrefresh(curscr);
132: text++;
133: continue;
134: }
135: if (win->x_col == COLS-1) {
136: /* check for wraparound */
137: xscroll(win, 0);
138: }
1.8 hugh 139: if (*text != '\t' &&
1.17 ! deraadt 140: ((!high_print && !isprint((unsigned char)*text)) ||
! 141: iscntrl((unsigned char)*text))) {
1.1 deraadt 142: waddch(win->x_win, '^');
143: getyx(win->x_win, win->x_line, win->x_col);
144: if (win->x_col == COLS-1) /* check for wraparound */
145: xscroll(win, 0);
146: cch = (*text & 63) + 64;
147: waddch(win->x_win, cch);
148: } else
1.7 angelos 149: waddch(win->x_win, (unsigned char)(*text));
1.1 deraadt 150: getyx(win->x_win, win->x_line, win->x_col);
151: text++;
152: }
153: wrefresh(win->x_win);
154: }
155:
156: /*
157: * Read the character at the indicated position in win
158: */
1.5 pjanzen 159: int
1.16 tedu 160: readwin(WINDOW *win, int line, int col)
1.1 deraadt 161: {
162: int oldline, oldcol;
1.9 mpech 163: int c;
1.1 deraadt 164:
165: getyx(win, oldline, oldcol);
166: wmove(win, line, col);
167: c = winch(win);
168: wmove(win, oldline, oldcol);
169: return (c);
170: }
171:
172: /*
173: * Scroll a window, blanking out the line following the current line
174: * so that the current position is obvious
175: */
1.5 pjanzen 176: void
1.16 tedu 177: xscroll(xwin_t *win, int flag)
1.1 deraadt 178: {
179:
180: if (flag == -1) {
181: wmove(win->x_win, 0, 0);
182: win->x_line = 0;
183: win->x_col = 0;
184: return;
185: }
186: win->x_col = 0;
1.12 millert 187: if (smooth_scroll) {
188: if (++win->x_line == win->x_nlines) {
189: --win->x_line;
190: scroll(win->x_win);
191: }
192: } else {
193: win->x_line = (win->x_line + 1) % win->x_nlines;
194: wmove(win->x_win, win->x_line, win->x_col);
195: wclrtoeol(win->x_win);
196: wmove(win->x_win, (win->x_line + 1) % win->x_nlines,
197: win->x_col);
198: wclrtoeol(win->x_win);
199: }
1.1 deraadt 200: wmove(win->x_win, win->x_line, win->x_col);
201: }
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