Mercurial > ~mikael > mcabber > hg
annotate mcabber/src/hbuf.c @ 368:da50f08ea058
Update hbuf_get_lines() comment
author | Mikael Berthe <mikael@lilotux.net> |
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date | Sun, 24 Jul 2005 21:47:41 +0100 |
parents | c289e3c39c48 |
children | dd9e2eb52916 |
rev | line source |
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71 | 1 /* |
2 * hbuf.c -- History buffer implementation | |
3 * | |
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 | |
22 #include <string.h> | |
23 | |
24 #include "hbuf.h" | |
25 | |
26 | |
27 /* This is a private structure type */ | |
28 | |
29 typedef struct { | |
30 char *ptr; | |
182 | 31 char *ptr_end; // beginning of the block |
32 char *ptr_end_alloc; // end of the current persistent block | |
71 | 33 guchar flags; |
34 | |
35 // XXX This should certainly be a pointer, and be allocated only when needed | |
36 // (for ex. when HBB_FLAG_PERSISTENT is set). | |
37 struct { // hbuf_line_info | |
184 | 38 time_t timestamp; |
39 guchar flags; | |
40 } prefix; | |
71 | 41 } hbuf_block; |
42 | |
43 | |
184 | 44 // hbuf_add_line(p_hbuf, text, prefix_flags, width) |
71 | 45 // Add a line to the given buffer. If width is not null, then lines are |
46 // wrapped at this length. | |
47 // | |
48 // Note 1: Splitting according to width won't work if there are tabs; they | |
49 // should be expanded before. | |
50 // Note 2: width does not include the ending \0. | |
184 | 51 void hbuf_add_line(GList **p_hbuf, const char *text, time_t timestamp, |
52 guint prefix_flags, guint width) | |
71 | 53 { |
54 GList *hbuf = *p_hbuf; | |
55 char *line, *cr, *end; | |
83 | 56 hbuf_block *hbuf_block_elt; |
71 | 57 |
58 if (!text) return; | |
59 | |
83 | 60 hbuf_block_elt = g_new0(hbuf_block, 1); |
184 | 61 hbuf_block_elt->prefix.timestamp = timestamp; |
62 hbuf_block_elt->prefix.flags = prefix_flags; | |
71 | 63 if (!hbuf) { |
153 | 64 do { |
65 hbuf_block_elt->ptr = g_new(char, HBB_BLOCKSIZE); | |
66 } while (!hbuf_block_elt->ptr); | |
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 { | |
71 hbuf_block *hbuf_b_prev = g_list_last(hbuf)->data; | |
72 hbuf_block_elt->ptr = hbuf_b_prev->ptr_end; | |
73 hbuf_block_elt->flags = HBB_FLAG_PERSISTENT; | |
182 | 74 hbuf_block_elt->ptr_end_alloc = hbuf_b_prev->ptr_end_alloc; |
71 | 75 *p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt); |
76 } | |
77 | |
78 if (strlen(text) >= HBB_BLOCKSIZE) { | |
79 // Too long | |
80 text = "[ERR:LINE_TOO_LONG]"; | |
197 | 81 hbuf_block_elt->prefix.flags |= HBB_PREFIX_INFO; |
71 | 82 } |
182 | 83 if (hbuf_block_elt->ptr + strlen(text) >= hbuf_block_elt->ptr_end_alloc) { |
71 | 84 // Too long for the current allocated bloc, we need another one |
153 | 85 do { |
86 hbuf_block_elt->ptr = g_new0(char, HBB_BLOCKSIZE); | |
87 } while (!hbuf_block_elt->ptr); | |
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; |
71 | 115 *p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt); |
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; |
71 | 133 *p_hbuf = g_list_append(*p_hbuf, hbuf_block_elt); |
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 } | |
153 } | |
154 | |
155 g_list_free(*p_hbuf); | |
156 *p_hbuf = NULL; | |
157 } | |
158 | |
159 // hbuf_rebuild() | |
160 // Rebuild all hbuf list, with the new width. | |
161 // If width == 0, lines are not wrapped. | |
162 void hbuf_rebuild(GList **p_hbuf, unsigned int width) | |
163 { | |
164 GList *first_elt, *curr_elt, *next_elt; | |
165 hbuf_block *hbuf_b_curr, *hbuf_b_next; | |
166 | |
150 | 167 // *p_hbuf needs to be the head of the list |
168 first_elt = *p_hbuf = g_list_first(*p_hbuf); | |
71 | 169 |
170 // #1 Remove non-persistent blocks (ptr_end should be updated!) | |
171 curr_elt = first_elt; | |
172 while (curr_elt) { | |
173 next_elt = g_list_next(curr_elt); | |
174 // Last element? | |
175 if (!next_elt) | |
176 break; | |
177 hbuf_b_curr = (hbuf_block*)(curr_elt->data); | |
178 hbuf_b_next = (hbuf_block*)(next_elt->data); | |
179 // Is next line not-persistent? | |
180 if (!(hbuf_b_next->flags & HBB_FLAG_PERSISTENT)) { | |
181 hbuf_b_curr->ptr_end = hbuf_b_next->ptr_end; | |
182 g_list_delete_link(curr_elt, next_elt); | |
183 } else | |
184 curr_elt = next_elt; | |
185 } | |
186 // #2 Go back to head and create non-persistent blocks when needed | |
187 if (width) { | |
188 char *line, *end; | |
189 curr_elt = first_elt; | |
190 | |
191 while (curr_elt) { | |
192 hbuf_b_curr = (hbuf_block*)(curr_elt->data); | |
193 line = hbuf_b_curr->ptr; | |
194 if (strlen(line) > width) { | |
195 hbuf_block *hbuf_b_prev = hbuf_b_curr; | |
196 | |
197 // We need to break where we can find a space char | |
198 char *br; // break pointer | |
199 for (br = line + width; br > line && *br != 32 && *br != 9; br--) | |
200 ; | |
201 if (br <= line) | |
202 br = line + width; | |
203 else | |
204 br++; | |
205 end = hbuf_b_curr->ptr_end; | |
206 hbuf_b_curr->ptr_end = br; | |
207 // Create another block, non-persistent | |
208 hbuf_b_curr = g_new0(hbuf_block, 1); | |
209 hbuf_b_curr->ptr = hbuf_b_prev->ptr_end; // == br | |
210 hbuf_b_curr->ptr_end = end; | |
211 hbuf_b_curr->flags = 0; | |
182 | 212 hbuf_b_curr->ptr_end_alloc = hbuf_b_prev->ptr_end_alloc; |
150 | 213 // This is OK because insert_before(NULL) == append(): |
214 *p_hbuf = g_list_insert_before(*p_hbuf, curr_elt->next, hbuf_b_curr); | |
71 | 215 } |
216 curr_elt = g_list_next(curr_elt); | |
217 } | |
218 } | |
219 } | |
220 | |
189 | 221 // hbuf_previous_persistent() |
222 // Returns the previous persistent block (line). If the given line is | |
223 // persistent, then it is returned. | |
224 // This function is used for example when resizing a buffer. If the top of the | |
225 // screen is on a non-persistent block, then a screen resize could destroy this | |
226 // line... | |
227 GList *hbuf_previous_persistent(GList *l_line) | |
228 { | |
229 hbuf_block *hbuf_b_elt; | |
230 | |
231 while (l_line) { | |
232 hbuf_b_elt = (hbuf_block*)l_line->data; | |
233 if (hbuf_b_elt->flags & HBB_FLAG_PERSISTENT) | |
234 return l_line; | |
235 l_line = g_list_previous(l_line); | |
236 } | |
237 | |
238 return NULL; | |
239 } | |
240 | |
368
da50f08ea058
Update hbuf_get_lines() comment
Mikael Berthe <mikael@lilotux.net>
parents:
197
diff
changeset
|
241 // hbuf_get_lines(hbuf, n) |
da50f08ea058
Update hbuf_get_lines() comment
Mikael Berthe <mikael@lilotux.net>
parents:
197
diff
changeset
|
242 // Returns an array of n *hbb_line pointers |
71 | 243 // (The first line will be the line currently pointed by hbuf) |
368
da50f08ea058
Update hbuf_get_lines() comment
Mikael Berthe <mikael@lilotux.net>
parents:
197
diff
changeset
|
244 // Note: The caller should free the array and the text pointers after use. |
184 | 245 hbb_line **hbuf_get_lines(GList *hbuf, unsigned int n) |
71 | 246 { |
247 unsigned int i; | |
248 | |
184 | 249 hbb_line **array = g_new0(hbb_line*, n); |
250 hbb_line **array_elt = array; | |
71 | 251 |
252 for (i=0 ; i < n ; i++) { | |
253 if (hbuf) { | |
254 hbuf_block *blk = (hbuf_block*)(hbuf->data); | |
255 int maxlen; | |
256 maxlen = blk->ptr_end - blk->ptr; | |
184 | 257 *array_elt = (hbb_line*)g_new(hbb_line, 1); |
258 (*array_elt)->timestamp = blk->prefix.timestamp; | |
259 (*array_elt)->flags = blk->prefix.flags; | |
260 (*array_elt)->text = g_strndup(blk->ptr, maxlen); | |
261 | |
71 | 262 hbuf = g_list_next(hbuf); |
263 } else | |
184 | 264 break; |
265 | |
266 array_elt++; | |
71 | 267 } |
268 | |
269 return array; | |
270 } | |
271 |