1 /****************************************************************************
2  * Copyright 2019,2020 Thomas E. Dickey                                     *
3  * Copyright 1998-2011,2012 Free Software Foundation, Inc.                  *
4  *                                                                          *
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29 
30 /****************************************************************************
31  *  Author: Juergen Pfeifer                                                 *
32  *     and: Thomas E. Dickey                                                *
33  ****************************************************************************/
34 
35 /*
36  *	lib_slkset.c
37  *      Set soft label text.
38  */
39 #include <curses.priv.h>
40 #include <ctype.h>
41 
42 #if USE_WIDEC_SUPPORT
43 #if HAVE_WCTYPE_H
44 #include <wctype.h>
45 #endif
46 #endif
47 
48 MODULE_ID("$Id: lib_slkset.c,v 1.26 2020/02/02 23:34:34 tom Exp $")
49 
50 NCURSES_EXPORT(int)
51 NCURSES_SP_NAME(slk_set) (NCURSES_SP_DCLx int i, const char *astr, int format)
52 {
53     SLK *slk;
54     int offset = 0;
55     int numchrs;
56     int numcols;
57     int limit;
58     const char *str = astr;
59     const char *p;
60 
61     T((T_CALLED("slk_set(%p, %d, \"%s\", %d)"), (void *) SP_PARM, i, str, format));
62 
63     if (SP_PARM == 0
64 	|| (slk = SP_PARM->_slk) == 0
65 	|| i < 1
66 	|| i > slk->labcnt
67 	|| format < 0
68 	|| format > 2)
69 	returnCode(ERR);
70     if (str == 0)
71 	str = "";
72     --i;			/* Adjust numbering of labels */
73 
74     limit = MAX_SKEY_LEN(SP_PARM->slk_format);
75     while (isspace(UChar(*str)))
76 	str++;			/* skip over leading spaces  */
77     p = str;
78 
79 #if USE_WIDEC_SUPPORT
80     numcols = 0;
81     while (*p != 0) {
82 	mbstate_t state;
83 	wchar_t wc;
84 	size_t need;
85 
86 	init_mb(state);
87 	need = mbrtowc(0, p, strlen(p), &state);
88 	if (need == (size_t) -1)
89 	    break;
90 	mbrtowc(&wc, p, need, &state);
91 	if (!iswprint((wint_t) wc))
92 	    break;
93 	if (_nc_wacs_width(wc) + numcols > limit)
94 	    break;
95 	numcols += _nc_wacs_width(wc);
96 	p += need;
97     }
98     numchrs = (int) (p - str);
99 #else
100     while (isprint(UChar(*p)))
101 	p++;			/* The first non-print stops */
102 
103     numcols = (int) (p - str);
104     if (numcols > limit)
105 	numcols = limit;
106     numchrs = numcols;
107 #endif
108 
109     FreeIfNeeded(slk->ent[i].ent_text);
110     if ((slk->ent[i].ent_text = strdup(str)) == 0)
111 	returnCode(ERR);
112     slk->ent[i].ent_text[numchrs] = '\0';
113 
114     if ((slk->ent[i].form_text = (char *) _nc_doalloc(slk->ent[i].form_text,
115 						      (size_t) (limit +
116 								numchrs + 1))
117 	) == 0)
118 	returnCode(ERR);
119 
120     switch (format) {
121     case 0:			/* left-justified */
122 	offset = 0;
123 	break;
124     case 1:			/* centered */
125 	offset = (limit - numcols) / 2;
126 	break;
127     case 2:			/* right-justified */
128 	offset = limit - numcols;
129 	break;
130     }
131     if (offset <= 0)
132 	offset = 0;
133     else
134 	memset(slk->ent[i].form_text, ' ', (size_t) offset);
135 
136     memcpy(slk->ent[i].form_text + offset,
137 	   slk->ent[i].ent_text,
138 	   (size_t) numchrs);
139 
140     if (offset < limit) {
141 	memset(slk->ent[i].form_text + offset + numchrs,
142 	       ' ',
143 	       (size_t) (limit - (offset + numcols)));
144     }
145 
146     slk->ent[i].form_text[numchrs - numcols + limit] = 0;
147     slk->ent[i].dirty = TRUE;
148     returnCode(OK);
149 }
150 
151 #if NCURSES_SP_FUNCS
152 NCURSES_EXPORT(int)
153 slk_set(int i, const char *astr, int format)
154 {
155     return NCURSES_SP_NAME(slk_set) (CURRENT_SCREEN, i, astr, format);
156 }
157 #endif
158