Mercurial > hg
annotate mcabber/src/hbuf.c @ 919:653c1cdfb589
Mention the "lang" variable
author | Mikael Berthe <mikael@lilotux.net> |
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date | Tue, 27 Jun 2006 19:34:23 +0200 |
parents | c65b71dcda94 |
children | a07bd351008b |
rev | line source |
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71 | 1 /* |
2 * hbuf.c -- History buffer implementation | |
393 | 3 * |
699 | 4 * Copyright (C) 2005, 2006 Mikael Berthe <bmikael@lists.lilotux.net> |
71 | 5 * |
6 * This program is free software; you can redistribute it and/or modify | |
7 * it under the terms of the GNU General Public License as published by | |
8 * the Free Software Foundation; either version 2 of the License, or (at | |
9 * your option) any later version. | |
10 * | |
11 * This program is distributed in the hope that it will be useful, but | |
12 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 * General Public License for more details. | |
15 * | |
16 * You should have received a copy of the GNU General Public License | |
17 * along with this program; if not, write to the Free Software | |
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
19 * USA | |
20 */ | |
21 | |
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22 #define _GNU_SOURCE /* We need glibc for strptime */ |
71 | 23 #include <string.h> |
24 | |
25 #include "hbuf.h" | |
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26 #include "utils.h" |
71 | 27 |
28 | |
29 /* This is a private structure type */ | |
30 | |
31 typedef struct { | |
32 char *ptr; | |
182 | 33 char *ptr_end; // beginning of the block |
34 char *ptr_end_alloc; // end of the current persistent block | |
71 | 35 guchar flags; |
36 | |
37 // XXX This should certainly be a pointer, and be allocated only when needed | |
38 // (for ex. when HBB_FLAG_PERSISTENT is set). | |
39 struct { // hbuf_line_info | |
184 | 40 time_t timestamp; |
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41 guint flags; |
184 | 42 } prefix; |
71 | 43 } hbuf_block; |
44 | |
45 | |
184 | 46 // hbuf_add_line(p_hbuf, text, prefix_flags, width) |
71 | 47 // Add a line to the given buffer. If width is not null, then lines are |
48 // wrapped at this length. | |
49 // | |
50 // Note 1: Splitting according to width won't work if there are tabs; they | |
51 // should be expanded before. | |
52 // Note 2: width does not include the ending \0. | |
184 | 53 void hbuf_add_line(GList **p_hbuf, const char *text, time_t timestamp, |
54 guint prefix_flags, guint width) | |
71 | 55 { |
56 GList *hbuf = *p_hbuf; | |
57 char *line, *cr, *end; | |
83 | 58 hbuf_block *hbuf_block_elt; |
71 | 59 |
60 if (!text) return; | |
61 | |
83 | 62 hbuf_block_elt = g_new0(hbuf_block, 1); |
184 | 63 hbuf_block_elt->prefix.timestamp = timestamp; |
64 hbuf_block_elt->prefix.flags = prefix_flags; | |
71 | 65 if (!hbuf) { |
390 | 66 hbuf_block_elt->ptr = g_new(char, HBB_BLOCKSIZE); |
71 | 67 hbuf_block_elt->flags = HBB_FLAG_ALLOC | HBB_FLAG_PERSISTENT; |
182 | 68 hbuf_block_elt->ptr_end_alloc = hbuf_block_elt->ptr + HBB_BLOCKSIZE; |
71 | 69 *p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt); |
70 } else { | |
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71 hbuf_block *hbuf_b_prev; |
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72 // Set p_hbuf to the end of the list, to speed up history loading |
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73 // (or CPU time will be used by g_list_last() for each line) |
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74 hbuf = *p_hbuf = g_list_last(*p_hbuf); |
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75 hbuf_b_prev = hbuf->data; |
71 | 76 hbuf_block_elt->ptr = hbuf_b_prev->ptr_end; |
77 hbuf_block_elt->flags = HBB_FLAG_PERSISTENT; | |
182 | 78 hbuf_block_elt->ptr_end_alloc = hbuf_b_prev->ptr_end_alloc; |
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79 *p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt); |
71 | 80 } |
81 | |
82 if (strlen(text) >= HBB_BLOCKSIZE) { | |
83 // Too long | |
84 text = "[ERR:LINE_TOO_LONG]"; | |
197 | 85 hbuf_block_elt->prefix.flags |= HBB_PREFIX_INFO; |
71 | 86 } |
182 | 87 if (hbuf_block_elt->ptr + strlen(text) >= hbuf_block_elt->ptr_end_alloc) { |
71 | 88 // Too long for the current allocated bloc, we need another one |
390 | 89 hbuf_block_elt->ptr = g_new0(char, HBB_BLOCKSIZE); |
71 | 90 hbuf_block_elt->flags = HBB_FLAG_ALLOC | HBB_FLAG_PERSISTENT; |
182 | 91 hbuf_block_elt->ptr_end_alloc = hbuf_block_elt->ptr + HBB_BLOCKSIZE; |
71 | 92 } |
93 | |
94 line = hbuf_block_elt->ptr; | |
95 // Ok, now we can copy the text.. | |
96 strcpy(line, text); | |
97 hbuf_block_elt->ptr_end = line + strlen(line) + 1; | |
98 end = hbuf_block_elt->ptr_end; | |
99 | |
100 // Let's add non-persistent blocs if necessary | |
101 // - If there are '\n' in the string | |
102 // - If length > width (and width != 0) | |
103 cr = strchr(line, '\n'); | |
104 while (cr || (width && strlen(line) > width)) { | |
105 hbuf_block *hbuf_b_prev = hbuf_block_elt; | |
106 | |
107 if (!width || (cr && (cr - line <= (int)width))) { | |
108 // Carriage return | |
109 *cr = 0; | |
110 hbuf_block_elt->ptr_end = cr; | |
111 // Create another persistent block | |
112 hbuf_block_elt = g_new0(hbuf_block, 1); | |
113 hbuf_block_elt->ptr = hbuf_b_prev->ptr_end + 1; // == cr+1 | |
114 hbuf_block_elt->ptr_end = end; | |
115 hbuf_block_elt->flags = HBB_FLAG_PERSISTENT; | |
182 | 116 hbuf_block_elt->ptr_end_alloc = hbuf_b_prev->ptr_end_alloc; |
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117 *p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt); |
71 | 118 line = hbuf_block_elt->ptr; |
119 } else { | |
120 // We need to break where we can find a space char | |
121 char *br; // break pointer | |
122 for (br = line + width; br > line && *br != 32 && *br != 9; br--) | |
123 ; | |
124 if (br <= line) | |
125 br = line + width; | |
126 else | |
127 br++; | |
128 hbuf_block_elt->ptr_end = br; | |
129 // Create another block, non-persistent | |
130 hbuf_block_elt = g_new0(hbuf_block, 1); | |
131 hbuf_block_elt->ptr = hbuf_b_prev->ptr_end; // == br | |
132 hbuf_block_elt->ptr_end = end; | |
133 hbuf_block_elt->flags = 0; | |
182 | 134 hbuf_block_elt->ptr_end_alloc = hbuf_b_prev->ptr_end_alloc; |
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135 *p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt); |
71 | 136 line = hbuf_block_elt->ptr; |
137 } | |
138 cr = strchr(line, '\n'); | |
139 } | |
140 } | |
141 | |
142 // hbuf_free() | |
143 // Destroys all hbuf list. | |
144 void hbuf_free(GList **p_hbuf) | |
145 { | |
146 hbuf_block *hbuf_b_elt; | |
147 GList *hbuf_elt; | |
148 GList *first_elt = g_list_first(*p_hbuf); | |
149 | |
150 for (hbuf_elt = first_elt; hbuf_elt; hbuf_elt = g_list_next(hbuf_elt)) { | |
151 hbuf_b_elt = (hbuf_block*)(hbuf_elt->data); | |
152 if (hbuf_b_elt->flags & HBB_FLAG_ALLOC) { | |
153 g_free(hbuf_b_elt->ptr); | |
154 } | |
390 | 155 g_free(hbuf_b_elt); |
71 | 156 } |
157 | |
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158 g_list_free(first_elt); |
71 | 159 *p_hbuf = NULL; |
160 } | |
161 | |
162 // hbuf_rebuild() | |
163 // Rebuild all hbuf list, with the new width. | |
164 // If width == 0, lines are not wrapped. | |
165 void hbuf_rebuild(GList **p_hbuf, unsigned int width) | |
166 { | |
167 GList *first_elt, *curr_elt, *next_elt; | |
168 hbuf_block *hbuf_b_curr, *hbuf_b_next; | |
169 | |
150 | 170 // *p_hbuf needs to be the head of the list |
171 first_elt = *p_hbuf = g_list_first(*p_hbuf); | |
71 | 172 |
173 // #1 Remove non-persistent blocks (ptr_end should be updated!) | |
174 curr_elt = first_elt; | |
175 while (curr_elt) { | |
176 next_elt = g_list_next(curr_elt); | |
177 // Last element? | |
178 if (!next_elt) | |
179 break; | |
180 hbuf_b_curr = (hbuf_block*)(curr_elt->data); | |
181 hbuf_b_next = (hbuf_block*)(next_elt->data); | |
182 // Is next line not-persistent? | |
183 if (!(hbuf_b_next->flags & HBB_FLAG_PERSISTENT)) { | |
184 hbuf_b_curr->ptr_end = hbuf_b_next->ptr_end; | |
390 | 185 g_free(hbuf_b_next); |
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186 curr_elt = g_list_delete_link(curr_elt, next_elt); |
393 | 187 } else |
71 | 188 curr_elt = next_elt; |
189 } | |
190 // #2 Go back to head and create non-persistent blocks when needed | |
191 if (width) { | |
192 char *line, *end; | |
193 curr_elt = first_elt; | |
194 | |
195 while (curr_elt) { | |
196 hbuf_b_curr = (hbuf_block*)(curr_elt->data); | |
197 line = hbuf_b_curr->ptr; | |
198 if (strlen(line) > width) { | |
199 hbuf_block *hbuf_b_prev = hbuf_b_curr; | |
200 | |
201 // We need to break where we can find a space char | |
202 char *br; // break pointer | |
203 for (br = line + width; br > line && *br != 32 && *br != 9; br--) | |
204 ; | |
205 if (br <= line) | |
206 br = line + width; | |
207 else | |
208 br++; | |
209 end = hbuf_b_curr->ptr_end; | |
210 hbuf_b_curr->ptr_end = br; | |
211 // Create another block, non-persistent | |
212 hbuf_b_curr = g_new0(hbuf_block, 1); | |
213 hbuf_b_curr->ptr = hbuf_b_prev->ptr_end; // == br | |
214 hbuf_b_curr->ptr_end = end; | |
215 hbuf_b_curr->flags = 0; | |
182 | 216 hbuf_b_curr->ptr_end_alloc = hbuf_b_prev->ptr_end_alloc; |
150 | 217 // This is OK because insert_before(NULL) == append(): |
218 *p_hbuf = g_list_insert_before(*p_hbuf, curr_elt->next, hbuf_b_curr); | |
71 | 219 } |
220 curr_elt = g_list_next(curr_elt); | |
221 } | |
222 } | |
223 } | |
224 | |
189 | 225 // hbuf_previous_persistent() |
226 // Returns the previous persistent block (line). If the given line is | |
227 // persistent, then it is returned. | |
228 // This function is used for example when resizing a buffer. If the top of the | |
229 // screen is on a non-persistent block, then a screen resize could destroy this | |
230 // line... | |
231 GList *hbuf_previous_persistent(GList *l_line) | |
232 { | |
233 hbuf_block *hbuf_b_elt; | |
234 | |
235 while (l_line) { | |
236 hbuf_b_elt = (hbuf_block*)l_line->data; | |
237 if (hbuf_b_elt->flags & HBB_FLAG_PERSISTENT) | |
238 return l_line; | |
239 l_line = g_list_previous(l_line); | |
240 } | |
241 | |
242 return NULL; | |
243 } | |
244 | |
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245 // hbuf_get_lines(hbuf, n) |
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246 // Returns an array of n hbb_line pointers |
71 | 247 // (The first line will be the line currently pointed by hbuf) |
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248 // Note: The caller should free the array, the hbb_line pointers and the |
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249 // text pointers after use. |
184 | 250 hbb_line **hbuf_get_lines(GList *hbuf, unsigned int n) |
71 | 251 { |
252 unsigned int i; | |
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253 hbuf_block *blk; |
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254 guchar last_persist_prefixflags = 0; |
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255 GList *last_persist; // last persistent flags |
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256 hbb_line **array, **array_elt; |
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257 |
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258 // To be able to correctly highlight multi-line messages, |
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259 // we need to look at the last non-null prefix, which should be the first |
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260 // line of the message. |
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261 last_persist = hbuf_previous_persistent(hbuf); |
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262 while (last_persist) { |
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263 blk = (hbuf_block*)last_persist->data; |
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264 if ((blk->flags & HBB_FLAG_PERSISTENT) && blk->prefix.flags) { |
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265 last_persist_prefixflags = blk->prefix.flags; |
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266 break; |
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267 } |
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268 last_persist = g_list_previous(last_persist); |
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269 } |
71 | 270 |
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271 array = g_new0(hbb_line*, n); |
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272 array_elt = array; |
71 | 273 |
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274 for (i = 0 ; i < n ; i++) { |
71 | 275 if (hbuf) { |
276 int maxlen; | |
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277 blk = (hbuf_block*)(hbuf->data); |
71 | 278 maxlen = blk->ptr_end - blk->ptr; |
184 | 279 *array_elt = (hbb_line*)g_new(hbb_line, 1); |
280 (*array_elt)->timestamp = blk->prefix.timestamp; | |
281 (*array_elt)->flags = blk->prefix.flags; | |
282 (*array_elt)->text = g_strndup(blk->ptr, maxlen); | |
283 | |
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284 if ((blk->flags & HBB_FLAG_PERSISTENT) && blk->prefix.flags) { |
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285 last_persist_prefixflags = blk->prefix.flags; |
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286 } else { |
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287 // Propagate highlighting flag |
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288 (*array_elt)->flags |= last_persist_prefixflags & HBB_PREFIX_HLIGHT; |
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289 } |
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290 |
71 | 291 hbuf = g_list_next(hbuf); |
292 } else | |
184 | 293 break; |
294 | |
295 array_elt++; | |
71 | 296 } |
297 | |
298 return array; | |
299 } | |
300 | |
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301 // hbuf_search(hbuf, direction, string) |
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302 // Look backward/forward for a line containing string in the history buffer |
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303 // Search starts at hbuf, and goes forward if direction == 1, backward if -1 |
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304 GList *hbuf_search(GList *hbuf, int direction, const char *string) |
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305 { |
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306 hbuf_block *blk; |
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307 |
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308 for (;;) { |
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309 if (direction > 0) |
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310 hbuf = g_list_next(hbuf); |
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311 else |
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312 hbuf = g_list_previous(hbuf); |
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313 |
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314 if (!hbuf) break; |
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315 |
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316 blk = (hbuf_block*)(hbuf->data); |
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317 // XXX blk->ptr is (maybe) not really correct, because the match should |
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318 // not be after ptr_end. We should check that... |
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319 if (strcasestr(blk->ptr, string)) |
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320 break; |
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321 } |
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322 |
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323 return hbuf; |
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324 } |
462 | 325 |
464 | 326 // hbuf_jump_date(hbuf, t) |
327 // Return a pointer to the first line after date t in the history buffer | |
328 GList *hbuf_jump_date(GList *hbuf, time_t t) | |
329 { | |
330 hbuf_block *blk; | |
331 | |
332 hbuf = g_list_first(hbuf); | |
333 | |
334 for ( ; hbuf && g_list_next(hbuf); hbuf = g_list_next(hbuf)) { | |
335 blk = (hbuf_block*)(hbuf->data); | |
336 if (blk->prefix.timestamp >= t) break; | |
337 } | |
338 | |
339 return hbuf; | |
340 } | |
341 | |
462 | 342 // hbuf_jump_percent(hbuf, pc) |
343 // Return a pointer to the line at % pc of the history buffer | |
344 GList *hbuf_jump_percent(GList *hbuf, int pc) | |
345 { | |
346 guint hlen; | |
347 | |
348 hbuf = g_list_first(hbuf); | |
349 hlen = g_list_length(hbuf); | |
350 | |
351 return g_list_nth(hbuf, pc*hlen/100); | |
352 } | |
576 | 353 |
580 | 354 /* vim: set expandtab cindent cinoptions=>2\:2(0: For Vim users... */ |