1 /****************************************************************************
2  * Copyright (c) 2001-2012,2014 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 **	lib_cchar.c
31 **
32 **	The routines setcchar() and getcchar().
33 **
34 */
35 
36 #include <curses.priv.h>
37 
38 MODULE_ID("$Id: lib_cchar.c,v 1.27 2014/02/01 22:10:42 tom Exp $")
39 
40 /*
41  * The SuSv2 description leaves some room for interpretation.  We'll assume wch
42  * points to a string which is L'\0' terminated, contains at least one
43  * character with strictly positive width, which must be the first, and
44  * contains no characters of negative width.
45  */
46 NCURSES_EXPORT(int)
47 setcchar(cchar_t *wcval,
48 	 const wchar_t *wch,
49 	 const attr_t attrs,
50 	 NCURSES_PAIRS_T color_pair,
51 	 const void *opts)
52 {
53     unsigned i;
54     unsigned len;
55     int code = OK;
56 
57     TR(TRACE_CCALLS, (T_CALLED("setcchar(%p,%s,%lu,%d,%p)"),
58 		      (void *) wcval, _nc_viswbuf(wch),
59 		      (unsigned long) attrs, (int) color_pair, opts));
60 
61     if (opts != NULL
62 	|| wch == NULL
63 	|| ((len = (unsigned) wcslen(wch)) > 1 && wcwidth(wch[0]) < 0)) {
64 	code = ERR;
65     } else {
66 	if (len > CCHARW_MAX)
67 	    len = CCHARW_MAX;
68 
69 	/*
70 	 * If we have a following spacing-character, stop at that point.  We
71 	 * are only interested in adding non-spacing characters.
72 	 */
73 	for (i = 1; i < len; ++i) {
74 	    if (wcwidth(wch[i]) != 0) {
75 		len = i;
76 		break;
77 	    }
78 	}
79 
80 	memset(wcval, 0, sizeof(*wcval));
81 
82 	if (len != 0) {
83 	    SetAttr(*wcval, attrs);
84 	    SetPair(CHDEREF(wcval), color_pair);
85 	    memcpy(&wcval->chars, wch, len * sizeof(wchar_t));
86 	    TR(TRACE_CCALLS, ("copy %d wchars, first is %s", len,
87 			      _tracecchar_t(wcval)));
88 	}
89     }
90 
91     TR(TRACE_CCALLS, (T_RETURN("%d"), code));
92     return (code);
93 }
94 
95 NCURSES_EXPORT(int)
96 getcchar(const cchar_t *wcval,
97 	 wchar_t *wch,
98 	 attr_t *attrs,
99 	 NCURSES_PAIRS_T *color_pair,
100 	 void *opts)
101 {
102     wchar_t *wp;
103     int len;
104     int code = ERR;
105 
106     TR(TRACE_CCALLS, (T_CALLED("getcchar(%p,%p,%p,%p,%p)"),
107 		      (const void *) wcval,
108 		      (void *) wch,
109 		      (void *) attrs,
110 		      (void *) color_pair,
111 		      opts));
112 
113     if (opts == NULL && wcval != NULL) {
114 	len = ((wp = wmemchr(wcval->chars, L'\0', (size_t) CCHARW_MAX))
115 	       ? (int) (wp - wcval->chars)
116 	       : CCHARW_MAX);
117 
118 	if (wch == NULL) {
119 	    /*
120 	     * If the value is a null, set the length to 1.
121 	     * If the value is not a null, return the length plus 1 for null.
122 	     */
123 	    code = (len < CCHARW_MAX) ? (len + 1) : CCHARW_MAX;
124 	} else if (attrs == 0 || color_pair == 0) {
125 	    code = ERR;
126 	} else if (len >= 0) {
127 	    *attrs = AttrOf(*wcval) & A_ATTRIBUTES;
128 	    *color_pair = (NCURSES_PAIRS_T) GetPair(*wcval);
129 	    wmemcpy(wch, wcval->chars, (size_t) len);
130 	    wch[len] = L'\0';
131 	    code = OK;
132 	}
133     }
134 
135     TR(TRACE_CCALLS, (T_RETURN("%d"), code));
136     return (code);
137 }
138