File: | src/lib/libcurses/tinfo/trim_sgr0.c |
Warning: | line 290, column 4 Value stored to 'i' is never read |
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1 | /* $OpenBSD: trim_sgr0.c,v 1.1 2010/01/12 23:22:06 nicm Exp $ */ |
2 | |
3 | /**************************************************************************** |
4 | * Copyright (c) 2005-2006,2007 Free Software Foundation, Inc. * |
5 | * * |
6 | * Permission is hereby granted, free of charge, to any person obtaining a * |
7 | * copy of this software and associated documentation files (the * |
8 | * "Software"), to deal in the Software without restriction, including * |
9 | * without limitation the rights to use, copy, modify, merge, publish, * |
10 | * distribute, distribute with modifications, sublicense, and/or sell * |
11 | * copies of the Software, and to permit persons to whom the Software is * |
12 | * furnished to do so, subject to the following conditions: * |
13 | * * |
14 | * The above copyright notice and this permission notice shall be included * |
15 | * in all copies or substantial portions of the Software. * |
16 | * * |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * |
18 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * |
19 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * |
20 | * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * |
21 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * |
22 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * |
23 | * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * |
24 | * * |
25 | * Except as contained in this notice, the name(s) of the above copyright * |
26 | * holders shall not be used in advertising or otherwise to promote the * |
27 | * sale, use or other dealings in this Software without prior written * |
28 | * authorization. * |
29 | ****************************************************************************/ |
30 | |
31 | /**************************************************************************** |
32 | * Author: Thomas Dickey * |
33 | ****************************************************************************/ |
34 | |
35 | #include <curses.priv.h> |
36 | |
37 | #include <ctype.h> |
38 | |
39 | #include <tic.h> |
40 | #include <term_entry.h> |
41 | |
42 | MODULE_ID("$Id: trim_sgr0.c,v 1.1 2010/01/12 23:22:06 nicm Exp $") |
43 | |
44 | #undef CURtp-> |
45 | #define CURtp-> tp-> |
46 | |
47 | #define CSI233 233 |
48 | #define ESC033 033 /* ^[ */ |
49 | #define L_BRACK'[' '[' |
50 | |
51 | static char * |
52 | set_attribute_9(TERMTYPE *tp, int flag) |
53 | { |
54 | const char *result; |
55 | |
56 | if ((result = tparm(set_attributestp-> Strings[131], 0, 0, 0, 0, 0, 0, 0, 0, flag)) == 0) |
57 | result = ""; |
58 | return strdup(result); |
59 | } |
60 | |
61 | static int |
62 | is_csi(const char *s) |
63 | { |
64 | if (UChar(s[0])((unsigned char)(s[0])) == CSI233) |
65 | return 1; |
66 | else if (s[0] == ESC033 && s[1] == L_BRACK'[') |
67 | return 2; |
68 | return 0; |
69 | } |
70 | |
71 | static char * |
72 | skip_zero(char *s) |
73 | { |
74 | if (s[0] == '0') { |
75 | if (s[1] == ';') |
76 | s += 2; |
77 | else if (isalpha(UChar(s[1])((unsigned char)(s[1])))) |
78 | s += 1; |
79 | } |
80 | return s; |
81 | } |
82 | |
83 | static const char * |
84 | skip_delay(const char *s) |
85 | { |
86 | if (s[0] == '$' && s[1] == '<') { |
87 | s += 2; |
88 | while (isdigit(UChar(*s)((unsigned char)(*s))) || *s == '/') |
89 | ++s; |
90 | if (*s == '>') |
91 | ++s; |
92 | } |
93 | return s; |
94 | } |
95 | |
96 | /* |
97 | * Improve similar_sgr a little by moving the attr-string from the beginning |
98 | * to the end of the s-string. |
99 | */ |
100 | static bool_Bool |
101 | rewrite_sgr(char *s, char *attr) |
102 | { |
103 | if (PRESENT(s)(((s) != (char *)0) && ((s) != (char *)(-1)))) { |
104 | if (PRESENT(attr)(((attr) != (char *)0) && ((attr) != (char *)(-1)))) { |
105 | unsigned len_s = strlen(s); |
106 | unsigned len_a = strlen(attr); |
107 | |
108 | if (len_s > len_a && !strncmp(attr, s, len_a)) { |
109 | unsigned n; |
110 | TR(TRACE_DATABASE, ("rewrite:\n\t%s", s)); |
111 | for (n = 0; n < len_s - len_a; ++n) { |
112 | s[n] = s[n + len_a]; |
113 | } |
114 | strlcpy(s + n, attr, len_s - n); |
115 | TR(TRACE_DATABASE, ("to:\n\t%s", s)); |
116 | } |
117 | } |
118 | return TRUE1; |
119 | } |
120 | return FALSE0; /* oops */ |
121 | } |
122 | |
123 | static bool_Bool |
124 | similar_sgr(char *a, char *b) |
125 | { |
126 | bool_Bool result = FALSE0; |
127 | int csi_a = is_csi(a); |
128 | int csi_b = is_csi(b); |
129 | unsigned len_a; |
130 | unsigned len_b; |
131 | |
132 | TR(TRACE_DATABASE, ("similar_sgr:\n\t%s\n\t%s", |
133 | _nc_visbuf2(1, a), |
134 | _nc_visbuf2(2, b))); |
135 | if (csi_a != 0 && csi_b != 0 && csi_a == csi_b) { |
136 | a += csi_a; |
137 | b += csi_b; |
138 | if (*a != *b) { |
139 | a = skip_zero(a); |
140 | b = skip_zero(b); |
141 | } |
142 | } |
143 | len_a = strlen(a); |
144 | len_b = strlen(b); |
145 | if (len_a && len_b) { |
146 | if (len_a > len_b) |
147 | result = (strncmp(a, b, len_b) == 0); |
148 | else |
149 | result = (strncmp(a, b, len_a) == 0); |
150 | } |
151 | TR(TRACE_DATABASE, ("...similar_sgr: %d\n\t%s\n\t%s", result, |
152 | _nc_visbuf2(1, a), |
153 | _nc_visbuf2(2, b))); |
154 | return result; |
155 | } |
156 | |
157 | static unsigned |
158 | chop_out(char *string, unsigned i, unsigned j) |
159 | { |
160 | TR(TRACE_DATABASE, ("chop_out %d..%d from %s", i, j, _nc_visbuf(string))); |
161 | while (string[j] != '\0') { |
162 | string[i++] = string[j++]; |
163 | } |
164 | string[i] = '\0'; |
165 | return i; |
166 | } |
167 | |
168 | /* |
169 | * Compare, ignoring delays. Some of the delay values are inconsistent, and |
170 | * we do not want to be stopped by that. |
171 | * |
172 | * Returns the number of chars from 'full' that we matched. If any mismatch |
173 | * occurs, return zero. |
174 | */ |
175 | static int |
176 | compare_part(const char *part, const char *full) |
177 | { |
178 | const char *next_part; |
179 | const char *next_full; |
180 | int used_full = 0; |
181 | int used_delay = 0; |
182 | |
183 | while (*part != 0) { |
184 | if (*part != *full) { |
185 | used_full = 0; |
186 | break; |
187 | } |
188 | |
189 | /* |
190 | * Adjust the return-value to allow the rare case of |
191 | * string<delay>string |
192 | * to remove the whole piece. The most common case is a delay at the |
193 | * end of the string. The adjusted string will retain the delay, which |
194 | * is conservative. |
195 | */ |
196 | if (used_delay != 0) { |
197 | used_full += used_delay; |
198 | used_delay = 0; |
199 | } |
200 | if (*part == '$' && *full == '$') { |
201 | next_part = skip_delay(part); |
202 | next_full = skip_delay(full); |
203 | if (next_part != part && next_full != full) { |
204 | used_delay += (next_full - full); |
205 | full = next_full; |
206 | part = next_part; |
207 | continue; |
208 | } |
209 | } |
210 | ++used_full; |
211 | ++part; |
212 | ++full; |
213 | } |
214 | return used_full; |
215 | } |
216 | |
217 | /* |
218 | * While 'sgr0' is the "same" as termcap 'me', there is a compatibility issue. |
219 | * The sgr/sgr0 capabilities include setting/clearing alternate character set |
220 | * mode. A termcap application cannot use sgr, so sgr0 strings that reset |
221 | * alternate character set mode will be misinterpreted. Here, we remove those |
222 | * from the more common ISO/ANSI/VT100 entries, which have sgr0 agreeing with |
223 | * sgr. |
224 | * |
225 | * This function returns the modified sgr0 if it can be modified, a null if |
226 | * an error occurs, or the original sgr0 if no change is needed. |
227 | */ |
228 | NCURSES_EXPORT(char *)char * |
229 | _nc_trim_sgr0(TERMTYPE *tp) |
230 | { |
231 | char *result = exit_attribute_modetp-> Strings[39]; |
232 | |
233 | T((T_CALLED("_nc_trim_sgr0()"))); |
234 | |
235 | if (PRESENT(exit_attribute_mode)(((tp-> Strings[39]) != (char *)0) && ((tp-> Strings [39]) != (char *)(-1))) |
236 | && PRESENT(set_attributes)(((tp-> Strings[131]) != (char *)0) && ((tp-> Strings [131]) != (char *)(-1)))) { |
237 | bool_Bool found = FALSE0; |
238 | char *on = set_attribute_9(tp, 1); |
239 | char *off = set_attribute_9(tp, 0); |
240 | char *end = strdup(exit_attribute_modetp-> Strings[39]); |
241 | char *tmp; |
242 | size_t i, j, k; |
243 | |
244 | TR(TRACE_DATABASE, ("checking if we can trim sgr0 based on sgr")); |
245 | TR(TRACE_DATABASE, ("sgr0 %s", _nc_visbuf(end))); |
246 | TR(TRACE_DATABASE, ("sgr(9:off) %s", _nc_visbuf(off))); |
247 | TR(TRACE_DATABASE, ("sgr(9:on) %s", _nc_visbuf(on))); |
248 | |
249 | if (!rewrite_sgr(on, enter_alt_charset_modetp-> Strings[25]) |
250 | || !rewrite_sgr(off, exit_alt_charset_modetp-> Strings[38]) |
251 | || !rewrite_sgr(end, exit_alt_charset_modetp-> Strings[38])) { |
252 | FreeIfNeeded(off)if ((off) != 0) free(off); |
253 | } else if (similar_sgr(off, end) |
254 | && !similar_sgr(off, on)) { |
255 | TR(TRACE_DATABASE, ("adjusting sgr(9:off) : %s", _nc_visbuf(off))); |
256 | result = off; |
257 | /* |
258 | * If rmacs is a substring of sgr(0), remove that chunk. |
259 | */ |
260 | if (exit_alt_charset_modetp-> Strings[38] != 0) { |
261 | TR(TRACE_DATABASE, ("scan for rmacs %s", _nc_visbuf(exit_alt_charset_mode))); |
262 | j = strlen(off); |
263 | k = strlen(exit_alt_charset_modetp-> Strings[38]); |
264 | if (j > k) { |
265 | for (i = 0; i <= (j - k); ++i) { |
266 | int k2 = compare_part(exit_alt_charset_modetp-> Strings[38], off + i); |
267 | if (k2 != 0) { |
268 | found = TRUE1; |
269 | chop_out(off, i, i + k2); |
270 | break; |
271 | } |
272 | } |
273 | } |
274 | } |
275 | /* |
276 | * SGR 10 would reset to normal font. |
277 | */ |
278 | if (!found) { |
279 | if ((i = is_csi(off)) != 0 |
280 | && off[strlen(off) - 1] == 'm') { |
281 | TR(TRACE_DATABASE, ("looking for SGR 10 in %s", |
282 | _nc_visbuf(off))); |
283 | tmp = skip_zero(off + i); |
284 | if (tmp[0] == '1' |
285 | && skip_zero(tmp + 1) != tmp + 1) { |
286 | i = tmp - off; |
287 | if (off[i - 1] == ';') |
288 | i--; |
289 | j = skip_zero(tmp + 1) - off; |
290 | i = chop_out(off, i, j); |
Value stored to 'i' is never read | |
291 | found = TRUE1; |
292 | } |
293 | } |
294 | } |
295 | if (!found |
296 | && (tmp = strstr(end, off)) != 0 |
297 | && strcmp(end, off) != 0) { |
298 | i = tmp - end; |
299 | j = strlen(off); |
300 | tmp = strdup(end); |
301 | chop_out(tmp, i, j); |
302 | free(off); |
303 | result = tmp; |
304 | } |
305 | TR(TRACE_DATABASE, ("...adjusted sgr0 : %s", _nc_visbuf(result))); |
306 | if (!strcmp(result, exit_attribute_modetp-> Strings[39])) { |
307 | TR(TRACE_DATABASE, ("...same result, discard")); |
308 | free(result); |
309 | result = exit_attribute_modetp-> Strings[39]; |
310 | } |
311 | } else { |
312 | /* |
313 | * Either the sgr does not reference alternate character set, |
314 | * or it is incorrect. That's too hard to decide right now. |
315 | */ |
316 | free(off); |
317 | } |
318 | FreeIfNeeded(end)if ((end) != 0) free(end); |
319 | FreeIfNeeded(on)if ((on) != 0) free(on); |
320 | } else { |
321 | /* |
322 | * Possibly some applications are confused if sgr0 contains rmacs, |
323 | * but that would be a different bug report -TD |
324 | */ |
325 | } |
326 | |
327 | returnPtr(result)return result; |
328 | } |