1/****************************************************************************
2 * Copyright 2020 Thomas E. Dickey                                          *
3 * Copyright 1998-2013,2016 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      *
8 * without limitation the rights to use, copy, modify, merge, publish,      *
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 *     and: Sven Verdoolaege                                                *
34 *     and: Thomas E. Dickey                                                *
35 ****************************************************************************/
36
37/*
38**	lib_insch.c
39**
40**	The routine winsch().
41**
42*/
43
44#include <curses.priv.h>
45#include <ctype.h>
46
47MODULE_ID("$Id: lib_insch.c,v 1.37 2020/02/02 23:34:34 tom Exp $")
48
49/*
50 * Insert the given character, updating the current location to simplify
51 * inserting a string.
52 */
53NCURSES_EXPORT(int)
54_nc_insert_ch(SCREEN *sp, WINDOW *win, chtype ch)
55{
56    int code = OK;
57    int ch8 = (int) ChCharOf(ch);
58    NCURSES_CH_T wch;
59    int count;
60    int tabsize = (
61#if USE_REENTRANT
62		      sp->_TABSIZE
63#else
64		      TABSIZE
65#endif
66    );
67
68    switch (ch) {
69    case '\t':
70	for (count = (tabsize - (win->_curx % tabsize)); count > 0; count--) {
71	    if ((code = _nc_insert_ch(sp, win, ' ')) != OK)
72		break;
73	}
74	break;
75    case '\n':
76    case '\r':
77    case '\b':
78	SetChar2(wch, ch);
79	_nc_waddch_nosync(win, wch);
80	break;
81    default:
82	if (
83#if USE_WIDEC_SUPPORT
84	       WINDOW_EXT(win, addch_used) == 0 &&
85#endif
86	       (isprint(ch8) ||
87		(ChAttrOf(ch) & A_ALTCHARSET) ||
88		(sp != 0 && sp->_legacy_coding && !iscntrl(ch8)))) {
89	    if (win->_curx <= win->_maxx) {
90		struct ldat *line = &(win->_line[win->_cury]);
91		NCURSES_CH_T *end = &(line->text[win->_curx]);
92		NCURSES_CH_T *temp1 = &(line->text[win->_maxx]);
93		NCURSES_CH_T *temp2 = temp1 - 1;
94
95		SetChar2(wch, ch);
96
97		CHANGED_TO_EOL(line, win->_curx, win->_maxx);
98		while (temp1 > end)
99		    *temp1-- = *temp2--;
100
101		*temp1 = _nc_render(win, wch);
102		win->_curx++;
103	    }
104	} else if (iscntrl(ch8)) {
105	    NCURSES_CONST char *s;
106	    s = NCURSES_SP_NAME(unctrl) (NCURSES_SP_ARGx (chtype) ch8);
107	    while (*s != '\0') {
108		code = _nc_insert_ch(sp, win, ChAttrOf(ch) | UChar(*s));
109		if (code != OK)
110		    break;
111		++s;
112	    }
113	}
114#if USE_WIDEC_SUPPORT
115	else {
116	    /*
117	     * Handle multibyte characters here
118	     */
119	    SetChar2(wch, ch);
120	    wch = _nc_render(win, wch);
121	    count = _nc_build_wch(win, &wch);
122	    if (count > 0) {
123		code = _nc_insert_wch(win, &wch);
124	    } else if (count == -1) {
125		NCURSES_CONST char *s;
126		/* handle EILSEQ */
127		s = NCURSES_SP_NAME(unctrl) (NCURSES_SP_ARGx (chtype) ch8);
128		if (strlen(s) > 1) {
129		    while (*s != '\0') {
130			code = _nc_insert_ch(sp, win,
131					     ChAttrOf(ch) | UChar(*s));
132			if (code != OK)
133			    break;
134			++s;
135		    }
136		} else {
137		    code = ERR;
138		}
139	    }
140	}
141#endif
142	break;
143    }
144    return code;
145}
146
147NCURSES_EXPORT(int)
148winsch(WINDOW *win, chtype c)
149{
150    int code = ERR;
151
152    T((T_CALLED("winsch(%p, %s)"), (void *) win, _tracechtype(c)));
153
154    if (win != 0) {
155	NCURSES_SIZE_T oy = win->_cury;
156	NCURSES_SIZE_T ox = win->_curx;
157
158	code = _nc_insert_ch(_nc_screen_of(win), win, c);
159
160	win->_curx = ox;
161	win->_cury = oy;
162	_nc_synchook(win);
163    }
164    returnCode(code);
165}
166