lib_acs.c revision 174994 
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14 *                                                                          *
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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 1.34 2007/09/29 20:37:13 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	    SP->_screen_acs_map[j] = FALSE;
76	}
77    } else {
78	for (j = 1; j < ACS_LEN; ++j) {
79	    real_map[j] = 0;
80	}
81    }
82
83    /*
84     * Initializations for a UNIX-like multi-terminal environment.  Use
85     * ASCII chars and count on the terminfo description to do better.
86     */
87    real_map['l'] = '+';	/* should be upper left corner */
88    real_map['m'] = '+';	/* should be lower left corner */
89    real_map['k'] = '+';	/* should be upper right corner */
90    real_map['j'] = '+';	/* should be lower right corner */
91    real_map['u'] = '+';	/* should be tee pointing left */
92    real_map['t'] = '+';	/* should be tee pointing right */
93    real_map['v'] = '+';	/* should be tee pointing up */
94    real_map['w'] = '+';	/* should be tee pointing down */
95    real_map['q'] = '-';	/* should be horizontal line */
96    real_map['x'] = '|';	/* should be vertical line */
97    real_map['n'] = '+';	/* should be large plus or crossover */
98    real_map['o'] = '~';	/* should be scan line 1 */
99    real_map['s'] = '_';	/* should be scan line 9 */
100    real_map['`'] = '+';	/* should be diamond */
101    real_map['a'] = ':';	/* should be checker board (stipple) */
102    real_map['f'] = '\'';	/* should be degree symbol */
103    real_map['g'] = '#';	/* should be plus/minus */
104    real_map['~'] = 'o';	/* should be bullet */
105    real_map[','] = '<';	/* should be arrow pointing left */
106    real_map['+'] = '>';	/* should be arrow pointing right */
107    real_map['.'] = 'v';	/* should be arrow pointing down */
108    real_map['-'] = '^';	/* should be arrow pointing up */
109    real_map['h'] = '#';	/* should be board of squares */
110    real_map['i'] = '#';	/* should be lantern symbol */
111    real_map['0'] = '#';	/* should be solid square block */
112    /* these defaults were invented for ncurses */
113    real_map['p'] = '-';	/* should be scan line 3 */
114    real_map['r'] = '-';	/* should be scan line 7 */
115    real_map['y'] = '<';	/* should be less-than-or-equal-to */
116    real_map['z'] = '>';	/* should be greater-than-or-equal-to */
117    real_map['{'] = '*';	/* should be greek pi */
118    real_map['|'] = '!';	/* should be not-equal */
119    real_map['}'] = 'f';	/* should be pound-sterling symbol */
120
121    if (ena_acs != NULL) {
122	TPUTS_TRACE("ena_acs");
123	putp(ena_acs);
124    }
125#if NCURSES_EXT_FUNCS
126    /*
127     * Linux console "supports" the "PC ROM" character set by the coincidence
128     * that smpch/rmpch and smacs/rmacs have the same values.  ncurses has
129     * no codepage support (see SCO Merge for an example).  Outside of the
130     * values defined in acsc, there are no definitions for the "PC ROM"
131     * character set (assumed by some applications to be codepage 437), but we
132     * allow those applications to use those codepoints.
133     *
134     * test/blue.c uses this feature.
135     */
136#define PCH_KLUDGE(a,b) (a != 0 && b != 0 && !strcmp(a,b))
137    if (PCH_KLUDGE(enter_pc_charset_mode, enter_alt_charset_mode) &&
138	PCH_KLUDGE(exit_pc_charset_mode, exit_alt_charset_mode)) {
139	size_t i;
140	for (i = 1; i < ACS_LEN; ++i) {
141	    if (real_map[i] == 0) {
142		real_map[i] = i;
143		if (real_map != fake_map) {
144		    if (SP != 0)
145			SP->_screen_acs_map[i] = TRUE;
146		}
147	    }
148	}
149    }
150#endif
151
152    if (acs_chars != NULL) {
153	size_t i = 0;
154	size_t length = strlen(acs_chars);
155
156	while (i + 1 < length) {
157	    if (acs_chars[i] != 0 && UChar(acs_chars[i]) < ACS_LEN) {
158		real_map[UChar(acs_chars[i])] = UChar(acs_chars[i + 1]) | A_ALTCHARSET;
159		if (SP != 0)
160		    SP->_screen_acs_map[UChar(acs_chars[i])] = TRUE;
161	    }
162	    i += 2;
163	}
164    }
165#ifdef TRACE
166    /* Show the equivalent mapping, noting if it does not match the
167     * given attribute, whether by re-ordering or duplication.
168     */
169    if (USE_TRACEF(TRACE_CALLS)) {
170	size_t n, m;
171	char show[ACS_LEN * 2 + 1];
172	for (n = 1, m = 0; n < ACS_LEN; n++) {
173	    if (real_map[n] != 0) {
174		show[m++] = (char) n;
175		show[m++] = ChCharOf(real_map[n]);
176	    }
177	}
178	show[m] = 0;
179	if (acs_chars == NULL || strcmp(acs_chars, show))
180	    _tracef("%s acs_chars %s",
181		    (acs_chars == NULL) ? "NULL" : "READ",
182		    _nc_visbuf(acs_chars));
183	_tracef("%s acs_chars %s",
184		(acs_chars == NULL)
185		? "NULL"
186		: (strcmp(acs_chars, show)
187		   ? "DIFF"
188		   : "SAME"),
189		_nc_visbuf(show));
190	_nc_unlock_global(tracef);
191    }
192#endif /* TRACE */
193}
194