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      1 /*
      2  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
      3  * Use is subject to license terms.
      4  */
      5 
      6 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
      7 /*	  All Rights Reserved  	*/
      8 
      9 /*
     10  * Copyright (c) 1980 Regents of the University of California.
     11  * All rights reserved.  The Berkeley software License Agreement
     12  * specifies the terms and conditions for redistribution.
     13  */
     14 
     15 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     16 
     17 #ifndef lint
     18 static char
     19 sccsid[] = "@(#)addch.c 1.6 88/02/08 SMI"; /* from UCB 5.1 85/06/07 */
     20 #endif	/* not lint */
     21 
     22 #include	"curses.ext"
     23 
     24 /* forward declaration */
     25 static void set_ch(WINDOW *, int, int, int);
     26 
     27 /*
     28  *	This routine adds the character to the current position
     29  */
     30 
     31 int
     32 waddch(WINDOW *win, char c)
     33 {
     34 	int		x, y;
     35 	int		newx;
     36 
     37 	x = win->_curx;
     38 	y = win->_cury;
     39 #ifdef FULLDEBUG
     40 	fprintf(outf, "ADDCH('%c') at (%d, %d)\n", c, y, x);
     41 #endif
     42 	switch (c) {
     43 	case '\t':
     44 		for (newx = x + (8 - (x & 07)); x < newx; x++)
     45 			if (waddch(win, ' ') == ERR)
     46 				return (ERR);
     47 		return (OK);
     48 
     49 	default:
     50 #ifdef FULLDEBUG
     51 		fprintf(outf, "ADDCH: 1: y = %d, x = %d, firstch = %d,"
     52 		    " lastch = %d\n", y, x, win->_firstch[y],
     53 		    win->_lastch[y]);
     54 #endif
     55 		if (win->_flags & _STANDOUT)
     56 			c |= _STANDOUT;
     57 		set_ch(win, y, x, c);
     58 		win->_y[y][x++] = c;
     59 		if (x >= win->_maxx) {
     60 			x = 0;
     61 newline:
     62 			if (++y >= win->_maxy)
     63 				if (win->_scroll) {
     64 					(void) scroll(win);
     65 					--y;
     66 				}
     67 				else
     68 					return (ERR);
     69 		}
     70 #ifdef FULLDEBUG
     71 		fprintf(outf, "ADDCH: 2: y = %d, x = %d, firstch = %d,"
     72 		    " lastch = %d\n", y, x, win->_firstch[y],
     73 		    win->_lastch[y]);
     74 #endif
     75 		break;
     76 	case '\n':
     77 		(void) wclrtoeol(win);
     78 		if (!NONL)
     79 			x = 0;
     80 		goto newline;
     81 	case '\r':
     82 		x = 0;
     83 		break;
     84 	case '\b':
     85 		if (--x < 0)
     86 			x = 0;
     87 		break;
     88 	}
     89 	win->_curx = (short)x;
     90 	win->_cury = (short)y;
     91 	return (OK);
     92 }
     93 
     94 /*
     95  * set_ch:
     96  *	Set the first and last change flags for this window.
     97  */
     98 
     99 static void
    100 set_ch(WINDOW *win, int y, int x, int ch)
    101 {
    102 #ifdef	FULLDEBUG
    103 	fprintf(outf, "SET_CH(%0.2o, %d, %d)\n", win, y, x);
    104 #endif
    105 	if (win->_y[y][x] != ch) {
    106 		x += win->_ch_off;
    107 		if (win->_firstch[y] == _NOCHANGE)
    108 			win->_firstch[y] = win->_lastch[y] = (short)x;
    109 		else if (x < win->_firstch[y])
    110 			win->_firstch[y] = (short)x;
    111 		else if (x > win->_lastch[y])
    112 			win->_lastch[y] = (short)x;
    113 #ifdef FULLDEBUG
    114 		fprintf(outf, "SET_CH: change gives f/l: %d/%d [%d/%d]\n",
    115 		    win->_firstch[y], win->_lastch[y],
    116 		    win->_firstch[y] - win->_ch_off,
    117 		    win->_lastch[y] - win->_ch_off);
    118 #endif
    119 	}
    120 }
    121