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1 /****************************************************************************
2  * Copyright (c) 1998-2016,2017 Free Software Foundation, Inc.              *
3  *                                                                          *
4  * Permission is hereby granted, free of charge, to any person obtaining a  *
5  * copy of this software and associated documentation files (the            *
6  * "Software"), to deal in the Software without restriction, including      *
7  * without limitation the rights to use, copy, modify, merge, publish,      *
8  * distribute, distribute with modifications, sublicense, and/or sell       *
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  *
16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
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    *
20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
22  *                                                                          *
23  * Except as contained in this notice, the name(s) of the above copyright   *
24  * holders shall not be used in advertising or otherwise to promote the     *
25  * sale, use or other dealings in this Software without prior written       *
26  * authorization.                                                           *
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: Thomas E. Dickey                        1996-on                 *
33  ****************************************************************************/
34
35 /*
36 **      lib_instr.c
37 **
38 **      The routine winnstr().
39 **
40 */
41
42 #include <curses.priv.h>
43
44 MODULE_ID("$Id: lib_instr.c,v 1.23 2017/04/29 21:16:20 tom Exp $")
45
46 NCURSES_EXPORT(int)
47 winnstr(WINDOW *win, char *str, int n)
48 {
49     int i = 0;
50
51     T((T_CALLED("winnstr(%p,%p,%d)"), (void *) win, str, n));
52
53     if (!win || !str) {
54         i = ERR;
55     } else {
56         int row = win->_cury;
57         int col = win->_curx;
58         NCURSES_CH_T *text = win->_line[row].text;
59
60         if (n < 0)
61             n = win->_maxx - col + 1;
62
63         for (; i < n;) {
64 #if USE_WIDEC_SUPPORT
65             cchar_t *cell = &(text[col]);
66             attr_t attrs;
67             NCURSES_PAIRS_T pair;
68             mbstate_t state;
69             char *tmp;
70
71             if (!isWidecExt(*cell)) {
72                 wchar_t *wch;
73                 int n2;
74
75                 n2 = getcchar(cell, 0, 0, 0, 0);
76                 if (n2 > 0
77                     && (wch = typeCalloc(wchar_t, (unsigned) n2 + 1)) != 0) {
78                     bool done = FALSE;
79
80                     if (getcchar(cell, wch, &attrs, &pair, 0) == OK) {
81                         size_t n3;
82
83                         init_mb(state);
84                         n3 = wcstombs(0, wch, (size_t) 0);
85                         if (!isEILSEQ(n3) && (n3 != 0)) {
86                             size_t need = n3 + 10 + (size_t) i;
87                             int have = (int) n3 + i;
88
89                             /* check for loop-done as well as overflow */
90                             if (have > n || (int) need <= 0) {
91                                 done = TRUE;
92                             } else if ((tmp = typeCalloc(char, need)) == 0) {
93                                 done = TRUE;
94                             } else {
95                                 size_t i3;
96
97                                 init_mb(state);
98                                 wcstombs(tmp, wch, n3);
99                                 for (i3 = 0; i3 < n3; ++i3)
100                                     str[i++] = tmp[i3];
101                                 free(tmp);
102                             }
103                         }
104                     }
105                     free(wch);
106                     if (done)
107                         break;
108                 }
109             }
110 #else
111             str[i++] = (char) CharOf(text[col]);
112 #endif
113             if (++col > win->_maxx) {
114                 break;
115             }
116         }
117         str[i] = '\0';          /* SVr4 does not seem to count the null */
118     }
119     T(("winnstr returns %s", _nc_visbuf(str)));
120     returnCode(i);
121 }