ncurses 5.7 - patch 20090912
[ncurses.git] / ncurses / base / lib_insch.c
1 /****************************************************************************
2  * Copyright (c) 1998-2008,2009 Free Software Foundation, Inc.              *
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9  * copies of the Software, and to permit persons to whom the Software is    *
10  * furnished to do so, subject to the following conditions:                 *
11  *                                                                          *
12  * The above copyright notice and this permission notice shall be included  *
13  * in all copies or substantial portions of the Software.                   *
14  *                                                                          *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
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17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
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27  ****************************************************************************/
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 1.31 2009/09/12 18:11:55 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     NCURSES_CH_T wch;
57     int count;
58     NCURSES_CONST char *s;
59     int tabsize = (
60 #if USE_REENTRANT
61                       sp->_TABSIZE
62 #else
63                       TABSIZE
64 #endif
65     );
66
67     switch (ch) {
68     case '\t':
69         for (count = (tabsize - (win->_curx % tabsize)); count > 0; count--) {
70             if ((code = _nc_insert_ch(sp, win, ' ')) != OK)
71                 break;
72         }
73         break;
74     case '\n':
75     case '\r':
76     case '\b':
77         SetChar2(wch, ch);
78         _nc_waddch_nosync(win, wch);
79         break;
80     default:
81         if (
82 #if USE_WIDEC_SUPPORT
83                WINDOW_EXT(win, addch_used) == 0 &&
84 #endif
85                is8bits(ChCharOf(ch)) &&
86                (isprint(ChCharOf(ch)) ||
87                 (ChAttrOf(ch) & A_ALTCHARSET) ||
88                 (sp != 0 && sp->_legacy_coding && !iscntrl(ChCharOf(ch))))) {
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 (is8bits(ChCharOf(ch)) && iscntrl(ChCharOf(ch))) {
105             s = NCURSES_SP_NAME(unctrl) (NCURSES_SP_ARGx ChCharOf(ch));
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                 if (is8bits(ch)) {
126                     s = NCURSES_SP_NAME(unctrl) (NCURSES_SP_ARGx ChCharOf(ch));
127                     if (strlen(s) > 1) {
128                         while (*s != '\0') {
129                             code = _nc_insert_ch(sp, win,
130                                                  ChAttrOf(ch) | UChar(*s));
131                             if (code != OK)
132                                 break;
133                             ++s;
134                         }
135                     } else {
136                         code = ERR;
137                     }
138                 } else {
139                     code = ERR;
140                 }
141             }
142         }
143 #endif
144         break;
145     }
146     return code;
147 }
148
149 NCURSES_EXPORT(int)
150 winsch(WINDOW *win, chtype c)
151 {
152     NCURSES_SIZE_T oy;
153     NCURSES_SIZE_T ox;
154     int code = ERR;
155
156     T((T_CALLED("winsch(%p, %s)"), win, _tracechtype(c)));
157
158     if (win != 0) {
159         oy = win->_cury;
160         ox = win->_curx;
161
162         code = _nc_insert_ch(_nc_screen_of(win), win, c);
163
164         win->_curx = ox;
165         win->_cury = oy;
166         _nc_synchook(win);
167     }
168     returnCode(code);
169 }