ncurses 6.0 - patch 20160611
[ncurses.git] / ncurses / base / lib_instr.c
1 /****************************************************************************
2  * Copyright (c) 1998-2014,2016 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 1.22 2016/05/28 23:11:26 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 (!str)
54         returnCode(0);
55
56     if (win) {
57         int row, col;
58
59         getyx(win, row, col);
60
61         if (n < 0)
62             n = win->_maxx - win->_curx + 1;
63
64         for (; i < n;) {
65 #if USE_WIDEC_SUPPORT
66             cchar_t *cell = &(win->_line[row].text[col]);
67             attr_t attrs;
68             NCURSES_PAIRS_T pair;
69             mbstate_t state;
70             char *tmp;
71
72             if (!isWidecExt(*cell)) {
73                 wchar_t *wch;
74                 int n2;
75
76                 n2 = getcchar(cell, 0, 0, 0, 0);
77                 if (n2 > 0
78                     && (wch = typeCalloc(wchar_t, (unsigned) n2 + 1)) != 0) {
79                     bool done = FALSE;
80
81                     if (getcchar(cell, wch, &attrs, &pair, 0) == OK) {
82                         size_t n3;
83
84                         init_mb(state);
85                         n3 = wcstombs(0, wch, (size_t) 0);
86                         if (!isEILSEQ(n3) && (n3 != 0)) {
87                             size_t need = n3 + 10 + (size_t) i;
88                             int have = (int) n3 + i;
89
90                             /* check for loop-done as well as overflow */
91                             if (have > n || (int) need <= 0) {
92                                 done = TRUE;
93                             } else if ((tmp = typeCalloc(char, need)) == 0) {
94                                 done = TRUE;
95                             } else {
96                                 size_t i3;
97
98                                 init_mb(state);
99                                 wcstombs(tmp, wch, n3);
100                                 for (i3 = 0; i3 < n3; ++i3)
101                                     str[i++] = tmp[i3];
102                                 free(tmp);
103                             }
104                         }
105                     }
106                     free(wch);
107                     if (done)
108                         break;
109                 }
110             }
111 #else
112             str[i++] = (char) CharOf(win->_line[row].text[col]);
113 #endif
114             if (++col > win->_maxx) {
115                 break;
116             }
117         }
118     }
119     str[i] = '\0';              /* SVr4 does not seem to count the null */
120     T(("winnstr returns %s", _nc_visbuf(str)));
121     returnCode(i);
122 }