release/src/router/libncurses/ncurses/base/lib_getstr.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2008,2009 Free Software Foundation, Inc.              *
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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
  43 MODULE_ID("$Id: lib_getstr.c,v 1.29 2009/10/24 21:59:02 tom Exp $")
  44
  45 /*
  46  * This wipes out the last character, no matter whether it was a tab, control
  47  * or other character, and handles reverse wraparound.
  48  */
  49 static char *
  50 WipeOut(WINDOW *win, int y, int x, char *first, char *last, bool echoed)
  51 {
  52     if (last > first) {
  53         *--last = '\0';
  54         if (echoed) {
  55             int y1 = win->_cury;
  56             int x1 = win->_curx;
  57
  58             wmove(win, y, x);
  59             waddstr(win, first);
  60             getyx(win, y, x);
  61             while (win->_cury < y1
  62                    || (win->_cury == y1 && win->_curx < x1))
  63                 waddch(win, (chtype) ' ');
  64
  65             wmove(win, y, x);
  66         }
  67     }
  68     return last;
  69 }
  70
  71 NCURSES_EXPORT(int)
  72 wgetnstr_events(WINDOW *win,
  73                 char *str,
  74                 int maxlen,
  75                 EVENTLIST_1st(_nc_eventlist * evl))
  76 {
  77     SCREEN *sp = _nc_screen_of(win);
  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)"), (void *) win, (void *) str, maxlen));
  87
  88     if (!win)
  89         returnCode(ERR);
  90
  91     NCURSES_SP_NAME(_nc_get_tty_mode) (NCURSES_SP_ARGx &buf);
  92
  93     oldnl = sp->_nl;
  94     oldecho = sp->_echo;
  95     oldraw = sp->_raw;
  96     oldcbreak = sp->_cbreak;
  97     NCURSES_SP_NAME(nl) (NCURSES_SP_ARG);
  98     NCURSES_SP_NAME(noecho) (NCURSES_SP_ARG);
  99     NCURSES_SP_NAME(noraw) (NCURSES_SP_ARG);
 100     NCURSES_SP_NAME(cbreak) (NCURSES_SP_ARG);
 101
 102     erasec = NCURSES_SP_NAME(erasechar) (NCURSES_SP_ARG);
 103     killc = NCURSES_SP_NAME(killchar) (NCURSES_SP_ARG);
 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 #ifdef KEY_RESIZE
 133         if (ch == KEY_RESIZE)
 134             break;
 135 #endif
 136         if (ch == erasec || ch == KEY_LEFT || ch == KEY_BACKSPACE) {
 137             if (str > oldstr) {
 138                 str = WipeOut(win, y, x, oldstr, str, oldecho);
 139             }
 140         } else if (ch == killc) {
 141             while (str > oldstr) {
 142                 str = WipeOut(win, y, x, oldstr, str, oldecho);
 143             }
 144         } else if (ch >= KEY_MIN
 145                    || (maxlen >= 0 && str - oldstr >= maxlen)) {
 146             NCURSES_SP_NAME(beep) (NCURSES_SP_ARG);
 147         } else {
 148             *str++ = (char) ch;
 149             if (oldecho == TRUE) {
 150                 int oldy = win->_cury;
 151                 if (waddch(win, (chtype) ch) == ERR) {
 152                     /*
 153                      * We can't really use the lower-right
 154                      * corner for input, since it'll mess
 155                      * up bookkeeping for erases.
 156                      */
 157                     win->_flags &= ~_WRAPPED;
 158                     waddch(win, (chtype) ' ');
 159                     str = WipeOut(win, y, x, oldstr, str, oldecho);
 160                     continue;
 161                 } else if (win->_flags & _WRAPPED) {
 162                     /*
 163                      * If the last waddch forced a wrap &
 164                      * scroll, adjust our reference point
 165                      * for erasures.
 166                      */
 167                     if (win->_scroll
 168                         && oldy == win->_maxy
 169                         && win->_cury == win->_maxy) {
 170                         if (--y <= 0) {
 171                             y = 0;
 172                         }
 173                     }
 174                     win->_flags &= ~_WRAPPED;
 175                 }
 176                 wrefresh(win);
 177             }
 178         }
 179     }
 180
 181     win->_curx = 0;
 182     win->_flags &= ~_WRAPPED;
 183     if (win->_cury < win->_maxy)
 184         win->_cury++;
 185     wrefresh(win);
 186
 187     /* Restore with a single I/O call, to fix minor asymmetry between
 188      * raw/noraw, etc.
 189      */
 190     sp->_nl = oldnl;
 191     sp->_echo = oldecho;
 192     sp->_raw = oldraw;
 193     sp->_cbreak = oldcbreak;
 194
 195     NCURSES_SP_NAME(_nc_set_tty_mode) (NCURSES_SP_ARGx &buf);
 196
 197     *str = '\0';
 198     if (ch == ERR)
 199         returnCode(ch);
 200
 201     T(("wgetnstr returns %s", _nc_visbuf(oldstr)));
 202
 203 #ifdef KEY_EVENT
 204     if (ch == KEY_EVENT)
 205         returnCode(ch);
 206 #endif
 207 #ifdef KEY_RESIZE
 208     if (ch == KEY_RESIZE)
 209         returnCode(ch);
 210 #endif
 211
 212     returnCode(OK);
 213 }
 214
 215 #ifdef NCURSES_WGETCH_EVENTS
 216 NCURSES_EXPORT(int)
 217 wgetnstr(WINDOW *win, char *str, int maxlen)
 218 {
 219     returnCode(wgetnstr_events(win,
 220                                str,
 221                                maxlen,
 222                                EVENTLIST_1st((_nc_eventlist *) 0)));
 223 }
 224 #endif