lib_insch.c   [plain text]

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/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 *     and: Sven Verdoolaege                                                *
 *     and: Thomas E. Dickey                                                *
 ****************************************************************************/

/*
**	lib_insch.c
**
**	The routine winsch().
**
*/

#include <curses.priv.h>
#include <ctype.h>

MODULE_ID("$Id: lib_insch.c,v 1.18 2002/11/23 21:41:05 tom Exp $")

/*
 * Insert the given character, updating the current location to simplify
 * inserting a string.
 */
void
_nc_insert_ch(WINDOW *win, chtype ch)
{
    NCURSES_CH_T wch;
    int count;

    switch (ch) {
    case '\t':
	for (count = (TABSIZE - (win->_curx % TABSIZE)); count > 0; count--)
	    _nc_insert_ch(win, ' ');
	break;
    case '\n':
    case '\r':
    case '\b':
	SetChar2(wch, ch);
	_nc_waddch_nosync(win, wch);
	break;
    default:
	if (is7bits(ch) && iscntrl(ch)) {
	    _nc_insert_ch(win, '^');
	    _nc_insert_ch(win, '@' + (ch));
	} else if (win->_curx <= win->_maxx) {
	    struct ldat *line = &(win->_line[win->_cury]);
	    NCURSES_CH_T *end = &(line->text[win->_curx]);
	    NCURSES_CH_T *temp1 = &(line->text[win->_maxx]);
	    NCURSES_CH_T *temp2 = temp1 - 1;

	    SetChar2(wch, ch);

	    CHANGED_TO_EOL(line, win->_curx, win->_maxx);
	    while (temp1 > end)
		*temp1-- = *temp2--;

	    *temp1 = _nc_render(win, wch);

	    win->_curx++;
	}
	break;
    }
}

NCURSES_EXPORT(int)
winsch(WINDOW *win, chtype c)
{
    NCURSES_SIZE_T oy;
    NCURSES_SIZE_T ox;
    int code = ERR;

    T((T_CALLED("winsch(%p, %s)"), win, _tracechtype(c)));

    if (win != 0) {
	oy = win->_cury;
	ox = win->_curx;

	_nc_insert_ch(win, c);

	win->_curx = ox;
	win->_cury = oy;
	_nc_synchook(win);
	code = OK;
    }
    returnCode(code);
}

NCURSES_EXPORT(int)
winsnstr(WINDOW *win, const char *s, int n)
{
    int code = ERR;
    NCURSES_SIZE_T oy;
    NCURSES_SIZE_T ox;
    const unsigned char *str = (const unsigned char *) s;
    const unsigned char *cp;

    T((T_CALLED("winsnstr(%p,%s,%d)"), win, _nc_visbufn(s, n), n));

    if (win != 0 && str != 0) {
	oy = win->_cury;
	ox = win->_curx;
	for (cp = str; *cp && (n <= 0 || (cp - str) < n); cp++) {
	    _nc_insert_ch(win, (chtype) UChar(*cp));
	}
	win->_curx = ox;
	win->_cury = oy;
	_nc_synchook(win);
	code = OK;
    }
    returnCode(code);
}