contrib/ncurses-5.4/ncurses/base/lib_getstr.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2000,2002 Free Software Foundation, Inc.              *
   3  *                                                                          *
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   5  * copy of this software and associated documentation files (the            *
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  10  * furnished to do so, subject to the following conditions:                 *
  11  *                                                                          *
  12  * The above copyright notice and this permission notice shall be included  *
  13  * in all copies or substantial portions of the Software.                   *
  14  *                                                                          *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
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  28
  29 /****************************************************************************
  30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
  32  ****************************************************************************/
  33
  34 /*
  35 **      lib_getstr.c
  36 **
  37 **      The routine wgetstr().
  38 **
  39 */
  40
  41 #include <curses.priv.h>
  42 #include <term.h>
  43
  44 MODULE_ID("$Id: lib_getstr.c,v 1.24 2002/09/01 17:31:12 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, bool 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     TTY buf;
  79     bool oldnl, oldecho, oldraw, oldcbreak;
  80     char erasec;
  81     char killc;
  82     char *oldstr;
  83     int ch;
  84     int y, x;
  85
  86     T((T_CALLED("wgetnstr(%p,%p, %d)"), win, str, maxlen));
  87
  88     if (!win)
  89         returnCode(ERR);
  90
  91     _nc_get_tty_mode(&buf);
  92
  93     oldnl = SP->_nl;
  94     oldecho = SP->_echo;
  95     oldraw = SP->_raw;
  96     oldcbreak = SP->_cbreak;
  97     nl();
  98     noecho();
  99     noraw();
 100     cbreak();
 101
 102     erasec = erasechar();
 103     killc = killchar();
 104
 105     oldstr = str;
 106     getyx(win, y, x);
 107
 108     if (is_wintouched(win) || (win->_flags & _HASMOVED))
 109         wrefresh(win);
 110
 111     while ((ch = wgetch_events(win, evl)) != ERR) {
 112         /*
 113          * Some terminals (the Wyse-50 is the most common) generate
 114          * a \n from the down-arrow key.  With this logic, it's the
 115          * user's choice whether to set kcud=\n for wgetch();
 116          * terminating *getstr() with \n should work either way.
 117          */
 118         if (ch == '\n'
 119             || ch == '\r'
 120             || ch == KEY_DOWN
 121             || ch == KEY_ENTER) {
 122             if (oldecho == TRUE
 123                 && win->_cury == win->_maxy
 124                 && win->_scroll)
 125                 wechochar(win, (chtype) '\n');
 126             break;
 127         }
 128 #ifdef KEY_EVENT
 129         if (ch == KEY_EVENT)
 130             break;
 131 #endif
 132         if (ch == erasec || ch == KEY_LEFT || ch == KEY_BACKSPACE) {
 133             if (str > oldstr) {
 134                 str = WipeOut(win, y, x, oldstr, str, oldecho);
 135             }
 136         } else if (ch == killc) {
 137             while (str > oldstr) {
 138                 str = WipeOut(win, y, x, oldstr, str, oldecho);
 139             }
 140         } else if (ch >= KEY_MIN
 141                    || (maxlen >= 0 && str - oldstr >= maxlen)) {
 142             beep();
 143         } else {
 144             *str++ = ch;
 145             if (oldecho == TRUE) {
 146                 int oldy = win->_cury;
 147                 if (waddch(win, (chtype) ch) == ERR) {
 148                     /*
 149                      * We can't really use the lower-right
 150                      * corner for input, since it'll mess
 151                      * up bookkeeping for erases.
 152                      */
 153                     win->_flags &= ~_WRAPPED;
 154                     waddch(win, (chtype) ' ');
 155                     str = WipeOut(win, y, x, oldstr, str, oldecho);
 156                     continue;
 157                 } else if (win->_flags & _WRAPPED) {
 158                     /*
 159                      * If the last waddch forced a wrap &
 160                      * scroll, adjust our reference point
 161                      * for erasures.
 162                      */
 163                     if (win->_scroll
 164                         && oldy == win->_maxy
 165                         && win->_cury == win->_maxy) {
 166                         if (--y <= 0) {
 167                             y = 0;
 168                         }
 169                     }
 170                     win->_flags &= ~_WRAPPED;
 171                 }
 172                 wrefresh(win);
 173             }
 174         }
 175     }
 176
 177     win->_curx = 0;
 178     win->_flags &= ~_WRAPPED;
 179     if (win->_cury < win->_maxy)
 180         win->_cury++;
 181     wrefresh(win);
 182
 183     /* Restore with a single I/O call, to fix minor asymmetry between
 184      * raw/noraw, etc.
 185      */
 186     SP->_nl = oldnl;
 187     SP->_echo = oldecho;
 188     SP->_raw = oldraw;
 189     SP->_cbreak = oldcbreak;
 190
 191     _nc_set_tty_mode(&buf);
 192
 193     *str = '\0';
 194     if (ch == ERR)
 195         returnCode(ch);
 196 #ifdef KEY_EVENT
 197     if (ch == KEY_EVENT)
 198         returnCode(ch);
 199 #endif
 200
 201     T(("wgetnstr returns %s", _nc_visbuf(oldstr)));
 202
 203     returnCode(OK);
 204 }
 205
 206 #ifdef NCURSES_WGETCH_EVENTS
 207 NCURSES_EXPORT(int)
 208 wgetnstr(WINDOW *win, char *str, int maxlen)
 209 {
 210     returnCode(wgetnstr_events(win,
 211                                str,
 212                                maxlen,
 213                                EVENTLIST_1st((_nc_eventlist *) 0)));
 214 }
 215 #endif