Mercurial > hg
annotate mcabber/src/hbuf.c @ 479:b82428ac107d
resname can be a null pointer in sme cases
author | Mikael Berthe <mikael@lilotux.net> |
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date | Mon, 03 Oct 2005 23:59:56 +0200 |
parents | e4840b288be0 |
children | 3134b4960cdb |
rev | line source |
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71 | 1 /* |
2 * hbuf.c -- History buffer implementation | |
393 | 3 * |
71 | 4 * Copyright (C) 2005 Mikael Berthe <bmikael@lists.lilotux.net> |
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" | |
26 | |
27 | |
28 /* This is a private structure type */ | |
29 | |
30 typedef struct { | |
31 char *ptr; | |
182 | 32 char *ptr_end; // beginning of the block |
33 char *ptr_end_alloc; // end of the current persistent block | |
71 | 34 guchar flags; |
35 | |
36 // XXX This should certainly be a pointer, and be allocated only when needed | |
37 // (for ex. when HBB_FLAG_PERSISTENT is set). | |
38 struct { // hbuf_line_info | |
184 | 39 time_t timestamp; |
40 guchar flags; | |
41 } prefix; | |
71 | 42 } hbuf_block; |
43 | |
44 | |
184 | 45 // hbuf_add_line(p_hbuf, text, prefix_flags, width) |
71 | 46 // Add a line to the given buffer. If width is not null, then lines are |
47 // wrapped at this length. | |
48 // | |
49 // Note 1: Splitting according to width won't work if there are tabs; they | |
50 // should be expanded before. | |
51 // Note 2: width does not include the ending \0. | |
184 | 52 void hbuf_add_line(GList **p_hbuf, const char *text, time_t timestamp, |
53 guint prefix_flags, guint width) | |
71 | 54 { |
55 GList *hbuf = *p_hbuf; | |
56 char *line, *cr, *end; | |
83 | 57 hbuf_block *hbuf_block_elt; |
71 | 58 |
59 if (!text) return; | |
60 | |
83 | 61 hbuf_block_elt = g_new0(hbuf_block, 1); |
184 | 62 hbuf_block_elt->prefix.timestamp = timestamp; |
63 hbuf_block_elt->prefix.flags = prefix_flags; | |
71 | 64 if (!hbuf) { |
390 | 65 hbuf_block_elt->ptr = g_new(char, HBB_BLOCKSIZE); |
71 | 66 hbuf_block_elt->flags = HBB_FLAG_ALLOC | HBB_FLAG_PERSISTENT; |
182 | 67 hbuf_block_elt->ptr_end_alloc = hbuf_block_elt->ptr + HBB_BLOCKSIZE; |
71 | 68 *p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt); |
69 } else { | |
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70 // Set p_hbuf to the end of the list, to speed up history loading |
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71 // (or CPU time will be used by g_list_last() for each line) |
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72 hbuf = *p_hbuf = g_list_last(*p_hbuf); |
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73 hbuf_block *hbuf_b_prev = hbuf->data; |
71 | 74 hbuf_block_elt->ptr = hbuf_b_prev->ptr_end; |
75 hbuf_block_elt->flags = HBB_FLAG_PERSISTENT; | |
182 | 76 hbuf_block_elt->ptr_end_alloc = hbuf_b_prev->ptr_end_alloc; |
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77 g_list_append(*p_hbuf, hbuf_block_elt); |
71 | 78 } |
79 | |
80 if (strlen(text) >= HBB_BLOCKSIZE) { | |
81 // Too long | |
82 text = "[ERR:LINE_TOO_LONG]"; | |
197 | 83 hbuf_block_elt->prefix.flags |= HBB_PREFIX_INFO; |
71 | 84 } |
182 | 85 if (hbuf_block_elt->ptr + strlen(text) >= hbuf_block_elt->ptr_end_alloc) { |
71 | 86 // Too long for the current allocated bloc, we need another one |
390 | 87 hbuf_block_elt->ptr = g_new0(char, HBB_BLOCKSIZE); |
71 | 88 hbuf_block_elt->flags = HBB_FLAG_ALLOC | HBB_FLAG_PERSISTENT; |
182 | 89 hbuf_block_elt->ptr_end_alloc = hbuf_block_elt->ptr + HBB_BLOCKSIZE; |
71 | 90 } |
91 | |
92 line = hbuf_block_elt->ptr; | |
93 // Ok, now we can copy the text.. | |
94 strcpy(line, text); | |
95 hbuf_block_elt->ptr_end = line + strlen(line) + 1; | |
96 end = hbuf_block_elt->ptr_end; | |
97 | |
98 // Let's add non-persistent blocs if necessary | |
99 // - If there are '\n' in the string | |
100 // - If length > width (and width != 0) | |
101 cr = strchr(line, '\n'); | |
102 while (cr || (width && strlen(line) > width)) { | |
103 hbuf_block *hbuf_b_prev = hbuf_block_elt; | |
104 | |
105 if (!width || (cr && (cr - line <= (int)width))) { | |
106 // Carriage return | |
107 *cr = 0; | |
108 hbuf_block_elt->ptr_end = cr; | |
109 // Create another persistent block | |
110 hbuf_block_elt = g_new0(hbuf_block, 1); | |
111 hbuf_block_elt->ptr = hbuf_b_prev->ptr_end + 1; // == cr+1 | |
112 hbuf_block_elt->ptr_end = end; | |
113 hbuf_block_elt->flags = HBB_FLAG_PERSISTENT; | |
182 | 114 hbuf_block_elt->ptr_end_alloc = hbuf_b_prev->ptr_end_alloc; |
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115 g_list_append(*p_hbuf, hbuf_block_elt); |
71 | 116 line = hbuf_block_elt->ptr; |
117 } else { | |
118 // We need to break where we can find a space char | |
119 char *br; // break pointer | |
120 for (br = line + width; br > line && *br != 32 && *br != 9; br--) | |
121 ; | |
122 if (br <= line) | |
123 br = line + width; | |
124 else | |
125 br++; | |
126 hbuf_block_elt->ptr_end = br; | |
127 // Create another block, non-persistent | |
128 hbuf_block_elt = g_new0(hbuf_block, 1); | |
129 hbuf_block_elt->ptr = hbuf_b_prev->ptr_end; // == br | |
130 hbuf_block_elt->ptr_end = end; | |
131 hbuf_block_elt->flags = 0; | |
182 | 132 hbuf_block_elt->ptr_end_alloc = hbuf_b_prev->ptr_end_alloc; |
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133 g_list_append(*p_hbuf, hbuf_block_elt); |
71 | 134 line = hbuf_block_elt->ptr; |
135 } | |
136 cr = strchr(line, '\n'); | |
137 } | |
138 } | |
139 | |
140 // hbuf_free() | |
141 // Destroys all hbuf list. | |
142 void hbuf_free(GList **p_hbuf) | |
143 { | |
144 hbuf_block *hbuf_b_elt; | |
145 GList *hbuf_elt; | |
146 GList *first_elt = g_list_first(*p_hbuf); | |
147 | |
148 for (hbuf_elt = first_elt; hbuf_elt; hbuf_elt = g_list_next(hbuf_elt)) { | |
149 hbuf_b_elt = (hbuf_block*)(hbuf_elt->data); | |
150 if (hbuf_b_elt->flags & HBB_FLAG_ALLOC) { | |
151 g_free(hbuf_b_elt->ptr); | |
152 } | |
390 | 153 g_free(hbuf_b_elt); |
71 | 154 } |
155 | |
156 g_list_free(*p_hbuf); | |
157 *p_hbuf = NULL; | |
158 } | |
159 | |
160 // hbuf_rebuild() | |
161 // Rebuild all hbuf list, with the new width. | |
162 // If width == 0, lines are not wrapped. | |
163 void hbuf_rebuild(GList **p_hbuf, unsigned int width) | |
164 { | |
165 GList *first_elt, *curr_elt, *next_elt; | |
166 hbuf_block *hbuf_b_curr, *hbuf_b_next; | |
167 | |
150 | 168 // *p_hbuf needs to be the head of the list |
169 first_elt = *p_hbuf = g_list_first(*p_hbuf); | |
71 | 170 |
171 // #1 Remove non-persistent blocks (ptr_end should be updated!) | |
172 curr_elt = first_elt; | |
173 while (curr_elt) { | |
174 next_elt = g_list_next(curr_elt); | |
175 // Last element? | |
176 if (!next_elt) | |
177 break; | |
178 hbuf_b_curr = (hbuf_block*)(curr_elt->data); | |
179 hbuf_b_next = (hbuf_block*)(next_elt->data); | |
180 // Is next line not-persistent? | |
181 if (!(hbuf_b_next->flags & HBB_FLAG_PERSISTENT)) { | |
182 hbuf_b_curr->ptr_end = hbuf_b_next->ptr_end; | |
390 | 183 g_free(hbuf_b_next); |
71 | 184 g_list_delete_link(curr_elt, next_elt); |
393 | 185 } else |
71 | 186 curr_elt = next_elt; |
187 } | |
188 // #2 Go back to head and create non-persistent blocks when needed | |
189 if (width) { | |
190 char *line, *end; | |
191 curr_elt = first_elt; | |
192 | |
193 while (curr_elt) { | |
194 hbuf_b_curr = (hbuf_block*)(curr_elt->data); | |
195 line = hbuf_b_curr->ptr; | |
196 if (strlen(line) > width) { | |
197 hbuf_block *hbuf_b_prev = hbuf_b_curr; | |
198 | |
199 // We need to break where we can find a space char | |
200 char *br; // break pointer | |
201 for (br = line + width; br > line && *br != 32 && *br != 9; br--) | |
202 ; | |
203 if (br <= line) | |
204 br = line + width; | |
205 else | |
206 br++; | |
207 end = hbuf_b_curr->ptr_end; | |
208 hbuf_b_curr->ptr_end = br; | |
209 // Create another block, non-persistent | |
210 hbuf_b_curr = g_new0(hbuf_block, 1); | |
211 hbuf_b_curr->ptr = hbuf_b_prev->ptr_end; // == br | |
212 hbuf_b_curr->ptr_end = end; | |
213 hbuf_b_curr->flags = 0; | |
182 | 214 hbuf_b_curr->ptr_end_alloc = hbuf_b_prev->ptr_end_alloc; |
150 | 215 // This is OK because insert_before(NULL) == append(): |
216 *p_hbuf = g_list_insert_before(*p_hbuf, curr_elt->next, hbuf_b_curr); | |
71 | 217 } |
218 curr_elt = g_list_next(curr_elt); | |
219 } | |
220 } | |
221 } | |
222 | |
189 | 223 // hbuf_previous_persistent() |
224 // Returns the previous persistent block (line). If the given line is | |
225 // persistent, then it is returned. | |
226 // This function is used for example when resizing a buffer. If the top of the | |
227 // screen is on a non-persistent block, then a screen resize could destroy this | |
228 // line... | |
229 GList *hbuf_previous_persistent(GList *l_line) | |
230 { | |
231 hbuf_block *hbuf_b_elt; | |
232 | |
233 while (l_line) { | |
234 hbuf_b_elt = (hbuf_block*)l_line->data; | |
235 if (hbuf_b_elt->flags & HBB_FLAG_PERSISTENT) | |
236 return l_line; | |
237 l_line = g_list_previous(l_line); | |
238 } | |
239 | |
240 return NULL; | |
241 } | |
242 | |
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243 // hbuf_get_lines(hbuf, n) |
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244 // Returns an array of n hbb_line pointers |
71 | 245 // (The first line will be the line currently pointed by hbuf) |
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246 // Note: The caller should free the array and the text pointers after use. |
184 | 247 hbb_line **hbuf_get_lines(GList *hbuf, unsigned int n) |
71 | 248 { |
249 unsigned int i; | |
250 | |
184 | 251 hbb_line **array = g_new0(hbb_line*, n); |
252 hbb_line **array_elt = array; | |
71 | 253 |
254 for (i=0 ; i < n ; i++) { | |
255 if (hbuf) { | |
256 hbuf_block *blk = (hbuf_block*)(hbuf->data); | |
257 int maxlen; | |
258 maxlen = blk->ptr_end - blk->ptr; | |
184 | 259 *array_elt = (hbb_line*)g_new(hbb_line, 1); |
260 (*array_elt)->timestamp = blk->prefix.timestamp; | |
261 (*array_elt)->flags = blk->prefix.flags; | |
262 (*array_elt)->text = g_strndup(blk->ptr, maxlen); | |
263 | |
71 | 264 hbuf = g_list_next(hbuf); |
265 } else | |
184 | 266 break; |
267 | |
268 array_elt++; | |
71 | 269 } |
270 | |
271 return array; | |
272 } | |
273 | |
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274 // hbuf_search(hbuf, direction, string) |
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275 // Look backward/forward for a line containing string in the history buffer |
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276 // Search starts at hbuf, and goes forward if direction == 1, backward if -1 |
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277 GList *hbuf_search(GList *hbuf, int direction, const char *string) |
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278 { |
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279 hbuf_block *blk; |
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280 |
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281 for (;;) { |
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282 if (direction > 0) |
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283 hbuf = g_list_next(hbuf); |
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284 else |
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285 hbuf = g_list_previous(hbuf); |
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286 |
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287 if (!hbuf) break; |
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288 |
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289 blk = (hbuf_block*)(hbuf->data); |
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290 // XXX blk->ptr is (maybe) not really correct, because the match should |
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291 // not be after ptr_end. We should check that... |
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292 if (strcasestr(blk->ptr, string)) |
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293 break; |
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294 } |
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295 |
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296 return hbuf; |
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297 } |
462 | 298 |
464 | 299 // hbuf_jump_date(hbuf, t) |
300 // Return a pointer to the first line after date t in the history buffer | |
301 GList *hbuf_jump_date(GList *hbuf, time_t t) | |
302 { | |
303 hbuf_block *blk; | |
304 | |
305 hbuf = g_list_first(hbuf); | |
306 | |
307 for ( ; hbuf && g_list_next(hbuf); hbuf = g_list_next(hbuf)) { | |
308 blk = (hbuf_block*)(hbuf->data); | |
309 if (blk->prefix.timestamp >= t) break; | |
310 } | |
311 | |
312 return hbuf; | |
313 } | |
314 | |
462 | 315 // hbuf_jump_percent(hbuf, pc) |
316 // Return a pointer to the line at % pc of the history buffer | |
317 GList *hbuf_jump_percent(GList *hbuf, int pc) | |
318 { | |
319 guint hlen; | |
320 | |
321 hbuf = g_list_first(hbuf); | |
322 hlen = g_list_length(hbuf); | |
323 | |
324 return g_list_nth(hbuf, pc*hlen/100); | |
325 } |