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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  *     and: Sven Verdoolaege                                                *
33  *     and: Thomas E. Dickey                                                *
34  ****************************************************************************/
35 
36 /*
37 **	lib_insch.c
38 **
39 **	The routine winsch().
40 **
41 */
42 
43 #include <curses.priv.h>
44 #include <ctype.h>
45 
46 MODULE_ID("$Id: lib_insch.c,v 1.25 2008/02/03 00:14:37 tom Exp $")
47 
48 /*
49  * Insert the given character, updating the current location to simplify
50  * inserting a string.
51  */
52 NCURSES_EXPORT(int)
53 _nc_insert_ch(WINDOW *win, chtype ch)
54 {
55     int code = OK;
56     NCURSES_CH_T wch;
57     int count;
58     NCURSES_CONST char *s;
59 
60     switch (ch) {
61     case '\t':
62 	for (count = (TABSIZE - (win->_curx % TABSIZE)); count > 0; count--) {
63 	    if ((code = _nc_insert_ch(win, ' ')) != OK)
64 		break;
65 	}
66 	break;
67     case '\n':
68     case '\r':
69     case '\b':
70 	SetChar2(wch, ch);
71 	_nc_waddch_nosync(win, wch);
72 	break;
73     default:
74 	if (
75 #if USE_WIDEC_SUPPORT
76 	       WINDOW_EXT(win, addch_used) == 0 &&
77 #endif
78 	       is8bits(ChCharOf(ch)) &&
79 	       isprint(ChCharOf(ch))) {
80 	    if (win->_curx <= win->_maxx) {
81 		struct ldat *line = &(win->_line[win->_cury]);
82 		NCURSES_CH_T *end = &(line->text[win->_curx]);
83 		NCURSES_CH_T *temp1 = &(line->text[win->_maxx]);
84 		NCURSES_CH_T *temp2 = temp1 - 1;
85 
86 		SetChar2(wch, ch);
87 
88 		CHANGED_TO_EOL(line, win->_curx, win->_maxx);
89 		while (temp1 > end)
90 		    *temp1-- = *temp2--;
91 
92 		*temp1 = _nc_render(win, wch);
93 		win->_curx++;
94 	    }
95 	} else if (is8bits(ChCharOf(ch)) && iscntrl(ChCharOf(ch))) {
96 	    s = unctrl(ChCharOf(ch));
97 	    while (*s != '\0') {
98 		code = _nc_insert_ch(win, ChAttrOf(ch) | UChar(*s));
99 		if (code != OK)
100 		    break;
101 		++s;
102 	    }
103 	}
104 #if USE_WIDEC_SUPPORT
105 	else {
106 	    /*
107 	     * Handle multibyte characters here
108 	     */
109 	    SetChar2(wch, ch);
110 	    wch = _nc_render(win, wch);
111 	    count = _nc_build_wch(win, &wch);
112 	    if (count > 0) {
113 		code = wins_wch(win, &wch);
114 	    } else if (count == -1) {
115 		/* handle EILSEQ */
116 		if (is8bits(ch)) {
117 		    s = unctrl(ChCharOf(ch));
118 		    while (*s != '\0') {
119 			code = _nc_insert_ch(win, ChAttrOf(ch) | UChar(*s));
120 			if (code != OK)
121 			    break;
122 			++s;
123 		    }
124 		} else {
125 		    code = ERR;
126 		}
127 	    }
128 	}
129 #endif
130 	break;
131     }
132     return code;
133 }
134 
135 NCURSES_EXPORT(int)
136 winsch(WINDOW *win, chtype c)
137 {
138     NCURSES_SIZE_T oy;
139     NCURSES_SIZE_T ox;
140     int code = ERR;
141 
142     T((T_CALLED("winsch(%p, %s)"), win, _tracechtype(c)));
143 
144     if (win != 0) {
145 	oy = win->_cury;
146 	ox = win->_curx;
147 
148 	code = _nc_insert_ch(win, c);
149 
150 	win->_curx = ox;
151 	win->_cury = oy;
152 	_nc_synchook(win);
153     }
154     returnCode(code);
155 }
156