9166ea5240e7f3adf62c9631bca98ffd50847dfa
[ncurses.git] / ncurses / base / lib_insch.c
1 /****************************************************************************
2  * Copyright (c) 1998-2005,2008 Free Software Foundation, Inc.              *
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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 }