Annotation of src/usr.bin/talk/display.c, Revision 1.18
1.18 ! mestre 1: /* $OpenBSD: display.c,v 1.17 2013/11/28 18:24:55 deraadt 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: */
1.18 ! mestre 37: #include <ctype.h>
! 38:
1.1 deraadt 39: #include "talk.h"
40:
41: xwin_t my_win;
42: xwin_t his_win;
43: WINDOW *line_win;
44:
1.16 tedu 45: int curses_initialized;
46: int high_print;
47: bool smooth_scroll;
1.1 deraadt 48:
49: /*
50: * max HAS to be a function, it is called with
1.16 tedu 51: * an argument of the form --foo at least once.
1.1 deraadt 52: */
1.5 pjanzen 53: int
1.16 tedu 54: max(int a, int b)
1.1 deraadt 55: {
56:
57: return (a > b ? a : b);
58: }
59:
60: /*
61: * Display some text on somebody's window, processing some control
62: * characters while we are at it.
63: */
1.5 pjanzen 64: void
1.16 tedu 65: display(xwin_t *win, char *text, int size)
1.1 deraadt 66: {
1.9 mpech 67: int i;
1.1 deraadt 68: char cch;
69:
70: for (i = 0; i < size; i++) {
1.6 millert 71: /*
72: * Since we do not use curses's input routines we must
73: * convert '\r' -> '\n' ourselves.
74: */
75: if (*text == '\r')
76: *text = '\n';
77: if (*text == '\n') {
1.1 deraadt 78: xscroll(win, 0);
79: text++;
80: continue;
81: }
82: /* erase character */
83: if (*text == win->cerase) {
84: wmove(win->x_win, win->x_line, max(--win->x_col, 0));
85: getyx(win->x_win, win->x_line, win->x_col);
86: waddch(win->x_win, ' ');
87: wmove(win->x_win, win->x_line, win->x_col);
88: getyx(win->x_win, win->x_line, win->x_col);
89: text++;
90: continue;
91: }
92: /*
93: * On word erase search backwards until we find
94: * the beginning of a word or the beginning of
95: * the line.
96: */
97: if (*text == win->werase) {
98: int endcol, xcol, i, c;
99:
100: endcol = win->x_col;
101: xcol = endcol - 1;
102: while (xcol >= 0) {
103: c = readwin(win->x_win, win->x_line, xcol);
104: if (c != ' ')
105: break;
106: xcol--;
107: }
108: while (xcol >= 0) {
109: c = readwin(win->x_win, win->x_line, xcol);
110: if (c == ' ')
111: break;
112: xcol--;
113: }
114: wmove(win->x_win, win->x_line, xcol + 1);
115: for (i = xcol + 1; i < endcol; i++)
116: waddch(win->x_win, ' ');
117: wmove(win->x_win, win->x_line, xcol + 1);
118: getyx(win->x_win, win->x_line, win->x_col);
119: text++;
120: continue;
121: }
122: /* line kill */
123: if (*text == win->kill) {
124: wmove(win->x_win, win->x_line, 0);
125: wclrtoeol(win->x_win);
126: getyx(win->x_win, win->x_line, win->x_col);
127: text++;
128: continue;
129: }
130: if (*text == '\f') {
131: if (win == &my_win)
132: wrefresh(curscr);
133: text++;
134: continue;
135: }
136: if (win->x_col == COLS-1) {
137: /* check for wraparound */
138: xscroll(win, 0);
139: }
1.8 hugh 140: if (*text != '\t' &&
1.17 deraadt 141: ((!high_print && !isprint((unsigned char)*text)) ||
142: iscntrl((unsigned char)*text))) {
1.1 deraadt 143: waddch(win->x_win, '^');
144: getyx(win->x_win, win->x_line, win->x_col);
145: if (win->x_col == COLS-1) /* check for wraparound */
146: xscroll(win, 0);
147: cch = (*text & 63) + 64;
148: waddch(win->x_win, cch);
149: } else
1.7 angelos 150: waddch(win->x_win, (unsigned char)(*text));
1.1 deraadt 151: getyx(win->x_win, win->x_line, win->x_col);
152: text++;
153: }
154: wrefresh(win->x_win);
155: }
156:
157: /*
158: * Read the character at the indicated position in win
159: */
1.5 pjanzen 160: int
1.16 tedu 161: readwin(WINDOW *win, int line, int col)
1.1 deraadt 162: {
163: int oldline, oldcol;
1.9 mpech 164: int c;
1.1 deraadt 165:
166: getyx(win, oldline, oldcol);
167: wmove(win, line, col);
168: c = winch(win);
169: wmove(win, oldline, oldcol);
170: return (c);
171: }
172:
173: /*
174: * Scroll a window, blanking out the line following the current line
175: * so that the current position is obvious
176: */
1.5 pjanzen 177: void
1.16 tedu 178: xscroll(xwin_t *win, int flag)
1.1 deraadt 179: {
180:
181: if (flag == -1) {
182: wmove(win->x_win, 0, 0);
183: win->x_line = 0;
184: win->x_col = 0;
185: return;
186: }
187: win->x_col = 0;
1.12 millert 188: if (smooth_scroll) {
189: if (++win->x_line == win->x_nlines) {
190: --win->x_line;
191: scroll(win->x_win);
192: }
193: } else {
194: win->x_line = (win->x_line + 1) % win->x_nlines;
195: wmove(win->x_win, win->x_line, win->x_col);
196: wclrtoeol(win->x_win);
197: wmove(win->x_win, (win->x_line + 1) % win->x_nlines,
198: win->x_col);
199: wclrtoeol(win->x_win);
200: }
1.1 deraadt 201: wmove(win->x_win, win->x_line, win->x_col);
202: }