1 /****************************************************************************
2  * Copyright 2018,2020 Thomas E. Dickey                                     *
3  * Copyright 1998-2011,2017 Free Software Foundation, Inc.                  *
4  *                                                                          *
5  * Permission is hereby granted, free of charge, to any person obtaining a  *
6  * copy of this software and associated documentation files (the            *
7  * "Software"), to deal in the Software without restriction, including      *
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9  * distribute, distribute with modifications, sublicense, and/or sell       *
10  * copies of the Software, and to permit persons to whom the Software is    *
11  * furnished to do so, subject to the following conditions:                 *
12  *                                                                          *
13  * The above copyright notice and this permission notice shall be included  *
14  * in all copies or substantial portions of the Software.                   *
15  *                                                                          *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
19  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
22  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
23  *                                                                          *
24  * Except as contained in this notice, the name(s) of the above copyright   *
25  * holders shall not be used in advertising or otherwise to promote the     *
26  * sale, use or other dealings in this Software without prior written       *
27  * authorization.                                                           *
28  ****************************************************************************/
29 
30 /****************************************************************************
31  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
32  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
33  ****************************************************************************/
34 
35 /*
36 **	lib_getstr.c
37 **
38 **	The routine wgetstr().
39 **
40 */
41 
42 #include <curses.priv.h>
43 
44 MODULE_ID("$Id: lib_getstr.c,v 1.34 2020/02/02 23:34:34 tom Exp $")
45 
46 /*
47  * This wipes out the last character, no matter whether it was a tab, control
48  * or other character, and handles reverse wraparound.
49  */
50 static char *
51 WipeOut(WINDOW *win, int y, int x, char *first, char *last, int echoed)
52 {
53     if (last > first) {
54 	*--last = '\0';
55 	if (echoed) {
56 	    int y1 = win->_cury;
57 	    int x1 = win->_curx;
58 
59 	    wmove(win, y, x);
60 	    waddstr(win, first);
61 	    getyx(win, y, x);
62 	    while (win->_cury < y1
63 		   || (win->_cury == y1 && win->_curx < x1))
64 		waddch(win, (chtype) ' ');
65 
66 	    wmove(win, y, x);
67 	}
68     }
69     return last;
70 }
71 
72 NCURSES_EXPORT(int)
73 wgetnstr_events(WINDOW *win,
74 		char *str,
75 		int maxlen,
76 		EVENTLIST_1st(_nc_eventlist * evl))
77 {
78     SCREEN *sp = _nc_screen_of(win);
79     TTY buf;
80     bool oldnl, oldecho, oldraw, oldcbreak;
81     char erasec;
82     char killc;
83     char *oldstr;
84     int ch;
85     int y, x;
86 
87     T((T_CALLED("wgetnstr(%p,%p,%d)"), (void *) win, (void *) str, maxlen));
88 
89     if (!win || !str)
90 	returnCode(ERR);
91 
92     maxlen = _nc_getstr_limit(maxlen);
93 
94     NCURSES_SP_NAME(_nc_get_tty_mode) (NCURSES_SP_ARGx &buf);
95 
96     oldnl = sp->_nl;
97     oldecho = sp->_echo;
98     oldraw = sp->_raw;
99     oldcbreak = sp->_cbreak;
100     NCURSES_SP_NAME(nl) (NCURSES_SP_ARG);
101     NCURSES_SP_NAME(noecho) (NCURSES_SP_ARG);
102     NCURSES_SP_NAME(noraw) (NCURSES_SP_ARG);
103     NCURSES_SP_NAME(cbreak) (NCURSES_SP_ARG);
104 
105     erasec = NCURSES_SP_NAME(erasechar) (NCURSES_SP_ARG);
106     killc = NCURSES_SP_NAME(killchar) (NCURSES_SP_ARG);
107 
108     oldstr = str;
109     getyx(win, y, x);
110 
111     if (is_wintouched(win) || (win->_flags & _HASMOVED))
112 	wrefresh(win);
113 
114     while ((ch = wgetch_events(win, evl)) != ERR) {
115 	/*
116 	 * Some terminals (the Wyse-50 is the most common) generate
117 	 * a \n from the down-arrow key.  With this logic, it's the
118 	 * user's choice whether to set kcud=\n for wgetch();
119 	 * terminating *getstr() with \n should work either way.
120 	 */
121 	if (ch == '\n'
122 	    || ch == '\r'
123 	    || ch == KEY_DOWN
124 	    || ch == KEY_ENTER) {
125 	    if (oldecho == TRUE
126 		&& win->_cury == win->_maxy
127 		&& win->_scroll)
128 		wechochar(win, (chtype) '\n');
129 	    break;
130 	}
131 #ifdef KEY_EVENT
132 	if (ch == KEY_EVENT)
133 	    break;
134 #endif
135 #ifdef KEY_RESIZE
136 	if (ch == KEY_RESIZE)
137 	    break;
138 #endif
139 	if (ch == erasec || ch == KEY_LEFT || ch == KEY_BACKSPACE) {
140 	    if (str > oldstr) {
141 		str = WipeOut(win, y, x, oldstr, str, oldecho);
142 	    }
143 	} else if (ch == killc) {
144 	    while (str > oldstr) {
145 		str = WipeOut(win, y, x, oldstr, str, oldecho);
146 	    }
147 	} else if (ch >= KEY_MIN
148 		   || (str - oldstr >= maxlen)) {
149 	    NCURSES_SP_NAME(beep) (NCURSES_SP_ARG);
150 	} else {
151 	    *str++ = (char) ch;
152 	    if (oldecho == TRUE) {
153 		int oldy = win->_cury;
154 		if (waddch(win, (chtype) ch) == ERR) {
155 		    /*
156 		     * We can't really use the lower-right
157 		     * corner for input, since it'll mess
158 		     * up bookkeeping for erases.
159 		     */
160 		    win->_flags &= ~_WRAPPED;
161 		    waddch(win, (chtype) ' ');
162 		    str = WipeOut(win, y, x, oldstr, str, oldecho);
163 		    continue;
164 		} else if (win->_flags & _WRAPPED) {
165 		    /*
166 		     * If the last waddch forced a wrap &
167 		     * scroll, adjust our reference point
168 		     * for erasures.
169 		     */
170 		    if (win->_scroll
171 			&& oldy == win->_maxy
172 			&& win->_cury == win->_maxy) {
173 			if (--y <= 0) {
174 			    y = 0;
175 			}
176 		    }
177 		    win->_flags &= ~_WRAPPED;
178 		}
179 		wrefresh(win);
180 	    }
181 	}
182     }
183 
184     win->_curx = 0;
185     win->_flags &= ~_WRAPPED;
186     if (win->_cury < win->_maxy)
187 	win->_cury++;
188     wrefresh(win);
189 
190     /* Restore with a single I/O call, to fix minor asymmetry between
191      * raw/noraw, etc.
192      */
193     sp->_nl = oldnl;
194     sp->_echo = oldecho;
195     sp->_raw = oldraw;
196     sp->_cbreak = oldcbreak;
197 
198     NCURSES_SP_NAME(_nc_set_tty_mode) (NCURSES_SP_ARGx &buf);
199 
200     *str = '\0';
201     if (ch == ERR)
202 	returnCode(ch);
203 
204     T(("wgetnstr returns %s", _nc_visbuf(oldstr)));
205 
206 #ifdef KEY_EVENT
207     if (ch == KEY_EVENT)
208 	returnCode(ch);
209 #endif
210 #ifdef KEY_RESIZE
211     if (ch == KEY_RESIZE)
212 	returnCode(ch);
213 #endif
214 
215     returnCode(OK);
216 }
217 
218 #ifdef NCURSES_WGETCH_EVENTS
219 NCURSES_EXPORT(int)
220 wgetnstr(WINDOW *win, char *str, int maxlen)
221 {
222     returnCode(wgetnstr_events(win,
223 			       str,
224 			       maxlen,
225 			       EVENTLIST_1st((_nc_eventlist *) 0)));
226 }
227 #endif
228