1/****************************************************************************
2 * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc.              *
3 *                                                                          *
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5 * copy of this software and associated documentation files (the            *
6 * "Software"), to deal in the Software without restriction, including      *
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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    *
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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     *
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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#include <curses.priv.h>
36#include <term.h>		/* ena_acs, acs_chars */
37
38MODULE_ID("$Id: lib_acs.c,v 1.36 2008/08/16 19:22:55 tom Exp $")
39
40#if BROKEN_LINKER || USE_REENTRANT
41#define MyBuffer _nc_prescreen.real_acs_map
42NCURSES_EXPORT_VAR(chtype *)
43_nc_acs_map(void)
44{
45    if (MyBuffer == 0)
46	MyBuffer = typeCalloc(chtype, ACS_LEN);
47    return MyBuffer;
48}
49#undef MyBuffer
50#else
51NCURSES_EXPORT_VAR(chtype) acs_map[ACS_LEN] =
52{
53    0
54};
55#endif
56
57NCURSES_EXPORT(void)
58_nc_init_acs(void)
59{
60    chtype *fake_map = acs_map;
61    chtype *real_map = SP != 0 ? SP->_acs_map : fake_map;
62    int j;
63
64    T(("initializing ACS map"));
65
66    /*
67     * If we're using this from curses (rather than terminfo), we are storing
68     * the mapping information in the SCREEN struct so we can decide how to
69     * render it.
70     */
71    if (real_map != fake_map) {
72	for (j = 1; j < ACS_LEN; ++j) {
73	    real_map[j] = 0;
74	    fake_map[j] = A_ALTCHARSET | j;
75	    if (SP)
76		SP->_screen_acs_map[j] = FALSE;
77	}
78    } else {
79	for (j = 1; j < ACS_LEN; ++j) {
80	    real_map[j] = 0;
81	}
82    }
83
84    /*
85     * Initializations for a UNIX-like multi-terminal environment.  Use
86     * ASCII chars and count on the terminfo description to do better.
87     */
88    real_map['l'] = '+';	/* should be upper left corner */
89    real_map['m'] = '+';	/* should be lower left corner */
90    real_map['k'] = '+';	/* should be upper right corner */
91    real_map['j'] = '+';	/* should be lower right corner */
92    real_map['u'] = '+';	/* should be tee pointing left */
93    real_map['t'] = '+';	/* should be tee pointing right */
94    real_map['v'] = '+';	/* should be tee pointing up */
95    real_map['w'] = '+';	/* should be tee pointing down */
96    real_map['q'] = '-';	/* should be horizontal line */
97    real_map['x'] = '|';	/* should be vertical line */
98    real_map['n'] = '+';	/* should be large plus or crossover */
99    real_map['o'] = '~';	/* should be scan line 1 */
100    real_map['s'] = '_';	/* should be scan line 9 */
101    real_map['`'] = '+';	/* should be diamond */
102    real_map['a'] = ':';	/* should be checker board (stipple) */
103    real_map['f'] = '\'';	/* should be degree symbol */
104    real_map['g'] = '#';	/* should be plus/minus */
105    real_map['~'] = 'o';	/* should be bullet */
106    real_map[','] = '<';	/* should be arrow pointing left */
107    real_map['+'] = '>';	/* should be arrow pointing right */
108    real_map['.'] = 'v';	/* should be arrow pointing down */
109    real_map['-'] = '^';	/* should be arrow pointing up */
110    real_map['h'] = '#';	/* should be board of squares */
111    real_map['i'] = '#';	/* should be lantern symbol */
112    real_map['0'] = '#';	/* should be solid square block */
113    /* these defaults were invented for ncurses */
114    real_map['p'] = '-';	/* should be scan line 3 */
115    real_map['r'] = '-';	/* should be scan line 7 */
116    real_map['y'] = '<';	/* should be less-than-or-equal-to */
117    real_map['z'] = '>';	/* should be greater-than-or-equal-to */
118    real_map['{'] = '*';	/* should be greek pi */
119    real_map['|'] = '!';	/* should be not-equal */
120    real_map['}'] = 'f';	/* should be pound-sterling symbol */
121
122    if (ena_acs != NULL) {
123	TPUTS_TRACE("ena_acs");
124	putp(ena_acs);
125    }
126#if NCURSES_EXT_FUNCS
127    /*
128     * Linux console "supports" the "PC ROM" character set by the coincidence
129     * that smpch/rmpch and smacs/rmacs have the same values.  ncurses has
130     * no codepage support (see SCO Merge for an example).  Outside of the
131     * values defined in acsc, there are no definitions for the "PC ROM"
132     * character set (assumed by some applications to be codepage 437), but we
133     * allow those applications to use those codepoints.
134     *
135     * test/blue.c uses this feature.
136     */
137#define PCH_KLUDGE(a,b) (a != 0 && b != 0 && !strcmp(a,b))
138    if (PCH_KLUDGE(enter_pc_charset_mode, enter_alt_charset_mode) &&
139	PCH_KLUDGE(exit_pc_charset_mode, exit_alt_charset_mode)) {
140	size_t i;
141	for (i = 1; i < ACS_LEN; ++i) {
142	    if (real_map[i] == 0) {
143		real_map[i] = i;
144		if (real_map != fake_map) {
145		    if (SP != 0)
146			SP->_screen_acs_map[i] = TRUE;
147		}
148	    }
149	}
150    }
151#endif
152
153    if (acs_chars != NULL) {
154	size_t i = 0;
155	size_t length = strlen(acs_chars);
156
157	while (i + 1 < length) {
158	    if (acs_chars[i] != 0 && UChar(acs_chars[i]) < ACS_LEN) {
159		real_map[UChar(acs_chars[i])] = UChar(acs_chars[i + 1]) | A_ALTCHARSET;
160		if (SP != 0)
161		    SP->_screen_acs_map[UChar(acs_chars[i])] = TRUE;
162	    }
163	    i += 2;
164	}
165    }
166#ifdef TRACE
167    /* Show the equivalent mapping, noting if it does not match the
168     * given attribute, whether by re-ordering or duplication.
169     */
170    if (USE_TRACEF(TRACE_CALLS)) {
171	size_t n, m;
172	char show[ACS_LEN * 2 + 1];
173	for (n = 1, m = 0; n < ACS_LEN; n++) {
174	    if (real_map[n] != 0) {
175		show[m++] = (char) n;
176		show[m++] = (char) ChCharOf(real_map[n]);
177	    }
178	}
179	show[m] = 0;
180	if (acs_chars == NULL || strcmp(acs_chars, show))
181	    _tracef("%s acs_chars %s",
182		    (acs_chars == NULL) ? "NULL" : "READ",
183		    _nc_visbuf(acs_chars));
184	_tracef("%s acs_chars %s",
185		(acs_chars == NULL)
186		? "NULL"
187		: (strcmp(acs_chars, show)
188		   ? "DIFF"
189		   : "SAME"),
190		_nc_visbuf(show));
191	_nc_unlock_global(tracef);
192    }
193#endif /* TRACE */
194}
195