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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 1.35 2013/05/18 21:58:56 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(SCREEN *sp, WINDOW *win, chtype ch)
54 {
55     int code = OK;
56     int ch8 = (int) ChCharOf(ch);
57     NCURSES_CH_T wch;
58     int count;
59     NCURSES_CONST char *s;
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 	    s = NCURSES_SP_NAME(unctrl) (NCURSES_SP_ARGx (chtype) ch8);
106 	    while (*s != '\0') {
107 		code = _nc_insert_ch(sp, win, ChAttrOf(ch) | UChar(*s));
108 		if (code != OK)
109 		    break;
110 		++s;
111 	    }
112 	}
113 #if USE_WIDEC_SUPPORT
114 	else {
115 	    /*
116 	     * Handle multibyte characters here
117 	     */
118 	    SetChar2(wch, ch);
119 	    wch = _nc_render(win, wch);
120 	    count = _nc_build_wch(win, &wch);
121 	    if (count > 0) {
122 		code = _nc_insert_wch(win, &wch);
123 	    } else if (count == -1) {
124 		/* handle EILSEQ */
125 		s = NCURSES_SP_NAME(unctrl) (NCURSES_SP_ARGx (chtype) ch8);
126 		if (strlen(s) > 1) {
127 		    while (*s != '\0') {
128 			code = _nc_insert_ch(sp, win,
129 					     ChAttrOf(ch) | UChar(*s));
130 			if (code != OK)
131 			    break;
132 			++s;
133 		    }
134 		} else {
135 		    code = ERR;
136 		}
137 	    }
138 	}
139 #endif
140 	break;
141     }
142     return code;
143 }
144 
145 NCURSES_EXPORT(int)
146 winsch(WINDOW *win, chtype c)
147 {
148     NCURSES_SIZE_T oy;
149     NCURSES_SIZE_T ox;
150     int code = ERR;
151 
152     T((T_CALLED("winsch(%p, %s)"), (void *) win, _tracechtype(c)));
153 
154     if (win != 0) {
155 	oy = win->_cury;
156 	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