1 /****************************************************************************
2  * Copyright 2020 Thomas E. Dickey                                          *
3  * Copyright 1998-2013,2016 Free Software Foundation, Inc.                  *
4  *                                                                          *
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15  *                                                                          *
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23  *                                                                          *
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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 
47 MODULE_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  */
53 NCURSES_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 
147 NCURSES_EXPORT(int)
148 winsch(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