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28
29/*
30**	lib_cchar.c
31**
32**	The routines setcchar() and getcchar().
33**
34*/
35
36#include <curses.priv.h>
37
38MODULE_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 */
46NCURSES_EXPORT(int)
47setcchar(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
95NCURSES_EXPORT(int)
96getcchar(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