comp_expand.c revision 76726 
1/****************************************************************************
2 * Copyright (c) 1998,2000 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 *  Author: Thomas E. Dickey <dickey@clark.net> 1998                        *
31 ****************************************************************************/
32
33#include <curses.priv.h>
34
35#include <ctype.h>
36#include <tic.h>
37
38MODULE_ID("$Id: comp_expand.c,v 1.15 2000/12/10 01:30:10 tom Exp $")
39
40static int
41trailing_spaces(const char *src)
42{
43    while (*src == ' ')
44	src++;
45    return *src == 0;
46}
47
48/* this deals with differences over whether 0x7f and 0x80..0x9f are controls */
49#define CHAR_OF(s) (*(unsigned const char *)(s))
50#define REALCTL(s) (CHAR_OF(s) < 127 && iscntrl(CHAR_OF(s)))
51#define REALPRINT(s) (CHAR_OF(s) < 127 && isprint(CHAR_OF(s)))
52
53NCURSES_EXPORT(char *)
54_nc_tic_expand
55(const char *srcp, bool tic_format, int numbers)
56{
57    static char *buffer;
58    static size_t length;
59
60    int bufp;
61    const char *str = VALID_STRING(srcp) ? srcp : "";
62    bool islong = (strlen(str) > 3);
63    size_t need = (2 + strlen(str)) * 4;
64    int ch;
65
66    if (buffer == 0 || need > length) {
67	if ((buffer = typeRealloc(char, length = need, buffer)) == 0)
68	      return 0;
69    }
70
71    bufp = 0;
72    while ((ch = CharOf(*str)) != 0) {
73	if (ch == '%' && REALPRINT(str + 1)) {
74	    buffer[bufp++] = *str++;
75	    /*
76	     * Though the character literals are more compact, most
77	     * terminal descriptions use numbers and are not easy
78	     * to read in character-literal form.
79	     */
80	    switch (numbers) {
81	    case -1:
82		if (str[0] == S_QUOTE
83		    && str[1] != '\\'
84		    && REALPRINT(str + 1)
85		    && str[2] == S_QUOTE) {
86		    sprintf(buffer + bufp, "{%d}", str[1]);
87		    bufp += strlen(buffer + bufp);
88		    str += 2;
89		} else {
90		    buffer[bufp++] = *str;
91		}
92		break;
93		/*
94		 * If we have a "%{number}", try to translate it into
95		 * a "%'char'" form, since that will run a little faster
96		 * when we're interpreting it.  Also, having one form
97		 * for the constant makes it simpler to compare terminal
98		 * descriptions.
99		 */
100	    case 1:
101		if (str[0] == L_BRACE
102		    && isdigit(CharOf(str[1]))) {
103		    char *dst = 0;
104		    long value = strtol(str + 1, &dst, 0);
105		    if (dst != 0
106			&& *dst == R_BRACE
107			&& value < 127
108			&& value != '\\'	/* FIXME */
109			&& isprint((int) value)) {
110			ch = (int) value;
111			buffer[bufp++] = S_QUOTE;
112			if (ch == '\\'
113			    || ch == S_QUOTE)
114			    buffer[bufp++] = '\\';
115			buffer[bufp++] = ch;
116			buffer[bufp++] = S_QUOTE;
117			str = dst;
118		    } else {
119			buffer[bufp++] = *str;
120		    }
121		} else {
122		    buffer[bufp++] = *str;
123		}
124		break;
125	    default:
126		buffer[bufp++] = *str;
127		break;
128	    }
129	} else if (ch == 128) {
130	    buffer[bufp++] = '\\';
131	    buffer[bufp++] = '0';
132	} else if (ch == '\033') {
133	    buffer[bufp++] = '\\';
134	    buffer[bufp++] = 'E';
135	} else if (ch == '\\' && tic_format && (str == srcp || str[-1] != '^')) {
136	    buffer[bufp++] = '\\';
137	    buffer[bufp++] = '\\';
138	} else if (ch == ' ' && tic_format && (str == srcp ||
139					       trailing_spaces(str))) {
140	    buffer[bufp++] = '\\';
141	    buffer[bufp++] = 's';
142	} else if ((ch == ',' || ch == ':' || ch == '^') && tic_format) {
143	    buffer[bufp++] = '\\';
144	    buffer[bufp++] = ch;
145	} else if (REALPRINT(str)
146		   && (ch != ','
147		       && ch != ':'
148		       && !(ch == '!' && !tic_format)
149		       && ch != '^'))
150	    buffer[bufp++] = ch;
151#if 0				/* FIXME: this would be more readable (in fact the whole 'islong' logic should be removed) */
152	else if (ch == '\b') {
153	    buffer[bufp++] = '\\';
154	    buffer[bufp++] = 'b';
155	} else if (ch == '\f') {
156	    buffer[bufp++] = '\\';
157	    buffer[bufp++] = 'f';
158	} else if (ch == '\t' && islong) {
159	    buffer[bufp++] = '\\';
160	    buffer[bufp++] = 't';
161	}
162#endif
163	else if (ch == '\r' && (islong || (strlen(srcp) > 2 && str[1] == '\0'))) {
164	    buffer[bufp++] = '\\';
165	    buffer[bufp++] = 'r';
166	} else if (ch == '\n' && islong) {
167	    buffer[bufp++] = '\\';
168	    buffer[bufp++] = 'n';
169	}
170#define UnCtl(c) ((c) + '@')
171	else if (REALCTL(str) && ch != '\\'
172		 && (!islong || isdigit(CharOf(str[1])))) {
173	    (void) sprintf(&buffer[bufp], "^%c", UnCtl(ch));
174	    bufp += 2;
175	} else {
176	    (void) sprintf(&buffer[bufp], "\\%03o", ch);
177	    bufp += 4;
178	}
179
180	str++;
181    }
182
183    buffer[bufp] = '\0';
184    return (buffer);
185}
186