/[LeafOK_CVS]/lbbs/src/lml.c
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Revision 1.45 - (show annotations)
Thu Nov 6 13:20:24 2025 UTC (4 months, 1 week ago) by sysadm
Branch: MAIN
Changes since 1.44: +22 -11 lines
Content type: text/x-csrc
Fix bug in handling incomplete LML tag
Use the same implementation of handling unmatched LML tag

1 /* SPDX-License-Identifier: GPL-3.0-or-later */
2 /*
3 * lml
4 * - LML render
5 *
6 * Copyright (C) 2004-2025 Leaflet <leaflet@leafok.com>
7 */
8
9 #include "common.h"
10 #include "lml.h"
11 #include "log.h"
12 #include "str_process.h"
13 #include <ctype.h>
14 #include <stdio.h>
15 #include <string.h>
16 #include <sys/param.h>
17
18 enum _lml_constant_t
19 {
20 LML_TAG_PARAM_BUF_LEN = 256,
21 LML_TAG_OUTPUT_BUF_LEN = 1024,
22 LML_TAG_QUOTE_MAX_LEVEL = 10,
23 };
24
25 clock_t lml_total_exec_duration = 0;
26
27 typedef int (*lml_tag_filter_cb)(const char *tag_name, const char *tag_param_buf, char *tag_output_buf, size_t tag_output_buf_len, int quote_mode);
28
29 static int lml_tag_color_filter(const char *tag_name, const char *tag_param_buf, char *tag_output_buf, size_t tag_output_buf_len, int quote_mode)
30 {
31 if (strcasecmp(tag_name, "color") == 0)
32 {
33 if (strcasecmp(tag_param_buf, "red") == 0)
34 {
35 return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;31m");
36 }
37 else if (strcasecmp(tag_param_buf, "green") == 0)
38 {
39 return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;32m");
40 }
41 else if (strcasecmp(tag_param_buf, "yellow") == 0)
42 {
43 return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;33m");
44 }
45 else if (strcasecmp(tag_param_buf, "blue") == 0)
46 {
47 return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;34m");
48 }
49 else if (strcasecmp(tag_param_buf, "magenta") == 0)
50 {
51 return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;35m");
52 }
53 else if (strcasecmp(tag_param_buf, "cyan") == 0)
54 {
55 return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;36m");
56 }
57 else if (strcasecmp(tag_param_buf, "black") == 0)
58 {
59 return snprintf(tag_output_buf, tag_output_buf_len, "\033[1;30;47m");
60 }
61 }
62 return 0;
63 }
64
65 static const char *lml_tag_quote_color[] = {
66 "\033[33m", // yellow
67 "\033[32m", // green
68 "\033[35m", // magenta
69 };
70
71 static const int LML_TAG_QUOTE_LEVEL_LOOP = (int)(sizeof(lml_tag_quote_color) / sizeof(const char *));
72
73 static int lml_tag_quote_level = 0;
74
75 static int lml_tag_quote_filter(const char *tag_name, const char *tag_param_buf, char *tag_output_buf, size_t tag_output_buf_len, int quote_mode)
76 {
77 if (strcasecmp(tag_name, "quote") == 0)
78 {
79 if (lml_tag_quote_level <= LML_TAG_QUOTE_MAX_LEVEL)
80 {
81 lml_tag_quote_level++;
82 }
83 return snprintf(tag_output_buf, tag_output_buf_len, "%s",
84 lml_tag_quote_color[lml_tag_quote_level % LML_TAG_QUOTE_LEVEL_LOOP]);
85 }
86 else if (strcasecmp(tag_name, "/quote") == 0)
87 {
88 if (lml_tag_quote_level > 0)
89 {
90 lml_tag_quote_level--;
91 }
92 return snprintf(tag_output_buf, tag_output_buf_len, "%s",
93 (lml_tag_quote_level > 0 ? lml_tag_quote_color[lml_tag_quote_level % LML_TAG_QUOTE_LEVEL_LOOP] : "\033[m"));
94 }
95
96 return 0;
97 }
98
99 static int lml_tag_disabled = 0;
100
101 static int lml_tag_disable_filter(const char *tag_name, const char *tag_param_buf, char *tag_output_buf, size_t tag_output_buf_len, int quote_mode)
102 {
103 lml_tag_disabled = 1;
104
105 return snprintf(tag_output_buf, tag_output_buf_len, "%s", (quote_mode ? "[plain]" : ""));
106 }
107
108 typedef struct lml_tag_def_t
109 {
110 const char *tag_name; // tag name
111 const char *tag_output; // output string
112 const char *default_param; // default param string
113 const char *quote_mode_output; // output string in quote mode
114 lml_tag_filter_cb tag_filter_cb; // tag filter callback
115 } LML_TAG_DEF;
116
117 const LML_TAG_DEF lml_tag_def[] = {
118 // Definition of tuple: {lml_tag, lml_output, default_param, quote_mode_output, lml_filter_cb}
119 {"plain", NULL, NULL, NULL, lml_tag_disable_filter},
120 {"nolml", "", NULL, "", NULL}, // deprecated
121 {"lml", "", NULL, "", NULL}, // deprecated
122 {"align", "", "", "", NULL}, // N/A
123 {"/align", "", "", "", NULL}, // N/A
124 {"size", "", "", "", NULL}, // N/A
125 {"/size", "", "", "", NULL}, // N/A
126 {"left", "[", "", "[left]", NULL},
127 {"right", "]", "", "[right]", NULL},
128 {"bold", "\033[1m", "", "", NULL}, // does not work in Fterm
129 {"/bold", "\033[22m", NULL, "", NULL},
130 {"b", "\033[1m", "", "", NULL},
131 {"/b", "\033[22m", NULL, "", NULL},
132 {"italic", "\033[5m", "", "", NULL}, // use blink instead
133 {"/italic", "\033[m", NULL, "", NULL}, // \033[25m does not work in Fterm
134 {"i", "\033[5m", "", "", NULL},
135 {"/i", "\033[m", NULL, "", NULL},
136 {"underline", "\033[4m", "", "", NULL},
137 {"/underline", "\033[m", NULL, "", NULL}, // \033[24m does not work in Fterm
138 {"u", "\033[4m", "", "", NULL},
139 {"/u", "\033[m", NULL, "", NULL},
140 {"color", NULL, NULL, "", lml_tag_color_filter},
141 {"/color", "\033[m", NULL, "", NULL},
142 {"quote", NULL, NULL, "", lml_tag_quote_filter},
143 {"/quote", NULL, NULL, "", lml_tag_quote_filter},
144 {"url", "", "", "", NULL},
145 {"/url", "(链接: %s)", NULL, "", NULL},
146 {"link", "", "", "", NULL},
147 {"/link", "(链接: %s)", NULL, "", NULL},
148 {"email", "", "", "", NULL},
149 {"/email", "(Email: %s)", NULL, "", NULL},
150 {"user", "", "", "", NULL},
151 {"/user", "(用户: %s)", NULL, "", NULL},
152 {"article", "", "", "", NULL},
153 {"/article", "(文章: %s)", NULL, "", NULL},
154 {"image", "(图片: %s)", "", "%s", NULL},
155 {"flash", "(Flash: %s)", "", "", NULL},
156 {"bwf", "\033[1;31m****\033[m", "", "****", NULL},
157 };
158
159 static const int lml_tag_count = sizeof(lml_tag_def) / sizeof(LML_TAG_DEF);
160 static int lml_tag_name_len[sizeof(lml_tag_def) / sizeof(LML_TAG_DEF)];
161 static int lml_ready = 0;
162
163 inline static void lml_init(void)
164 {
165 int i;
166
167 if (!lml_ready)
168 {
169 for (i = 0; i < lml_tag_count; i++)
170 {
171 lml_tag_name_len[i] = (int)strlen(lml_tag_def[i].tag_name);
172 }
173
174 lml_ready = 1;
175 }
176 }
177
178 #define CHECK_AND_APPEND_OUTPUT(out_buf, out_buf_len, out_buf_offset, tag_out, tag_out_len, line_width) \
179 { \
180 if ((out_buf_offset) + (tag_out_len) >= (out_buf_len)) \
181 { \
182 log_error("Buffer is not longer enough for output string %d >= %d\n", (out_buf_offset) + (tag_out_len), (out_buf_len)); \
183 out_buf[out_buf_offset] = '\0'; \
184 return (out_buf_offset); \
185 } \
186 memcpy((out_buf) + (out_buf_offset), (tag_out), (size_t)(tag_out_len)); \
187 *((out_buf) + (out_buf_offset) + (size_t)(tag_out_len)) = '\0'; \
188 (line_width) += str_length((out_buf) + (out_buf_offset), 1); \
189 (out_buf_offset) += (tag_out_len); \
190 }
191
192 int lml_render(const char *str_in, char *str_out, int buf_len, int width, int quote_mode)
193 {
194 clock_t clock_begin;
195 clock_t clock_end;
196
197 char c;
198 char tag_param_buf[LML_TAG_PARAM_BUF_LEN];
199 char tag_output_buf[LML_TAG_OUTPUT_BUF_LEN];
200 int i;
201 int j = 0;
202 int k;
203 int tag_start_pos = -1;
204 int tag_name_pos = -1;
205 int tag_end_pos = -1;
206 int tag_param_pos = -1;
207 int tag_output_len;
208 int new_line = 1;
209 int fb_quote_level = 0;
210 int tag_name_found;
211 int line_width = 0;
212
213 clock_begin = clock();
214
215 lml_init();
216
217 lml_tag_disabled = 0;
218 lml_tag_quote_level = 0;
219
220 if (width <= 0)
221 {
222 width = INT_MAX;
223 }
224
225 for (i = 0; str_in[i] != '\0'; i++)
226 {
227 if (!lml_tag_disabled && new_line)
228 {
229 while (str_in[i] == ':' && str_in[i + 1] == ' ') // FB2000 quote leading str
230 {
231 fb_quote_level++;
232 lml_tag_quote_level++;
233 i += 2;
234 }
235
236 if (!quote_mode && lml_tag_quote_level > 0)
237 {
238 tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, "%s",
239 lml_tag_quote_color[lml_tag_quote_level % LML_TAG_QUOTE_LEVEL_LOOP]);
240 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, tag_output_buf, tag_output_len, line_width);
241 }
242
243 for (k = 0; k < fb_quote_level; k++)
244 {
245 tag_output_buf[k * 2] = ':';
246 tag_output_buf[k * 2 + 1] = ' ';
247 }
248 tag_output_buf[fb_quote_level * 2] = '\0';
249 tag_output_len = fb_quote_level * 2;
250 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, tag_output_buf, tag_output_len, line_width);
251
252 new_line = 0;
253 }
254
255 if (lml_tag_disabled && new_line)
256 {
257 new_line = 0;
258 }
259
260 if (!quote_mode && !lml_tag_disabled && str_in[i] == '\033' && str_in[i + 1] == '[') // Escape sequence
261 {
262 for (k = i + 2; isdigit(str_in[k]) || str_in[k] == ';' || str_in[k] == '?'; k++)
263 ;
264
265 if (str_in[k] == 'm') // valid -- copy directly
266 {
267 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, str_in + i, k - i + 1, line_width);
268 }
269 else if (isalpha(str_in[k]))
270 {
271 // unsupported ANSI CSI command
272 }
273 else
274 {
275 k--;
276 }
277
278 i = k;
279 continue;
280 }
281
282 if (str_in[i] == '\n') // jump out of tag at end of line
283 {
284 if (!lml_tag_disabled && tag_start_pos != -1) // tag is not closed
285 {
286 if (line_width + 1 > width)
287 {
288 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, "\n", 1, line_width);
289 new_line = 1;
290 line_width = 0;
291 i--; // redo at current i
292 continue;
293 }
294
295 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, "[", 1, line_width);
296 i = tag_start_pos; // restart from tag_start_pos + 1
297 tag_start_pos = -1;
298 tag_name_pos = -1;
299 continue;
300 }
301
302 if (!lml_tag_disabled && fb_quote_level > 0)
303 {
304 lml_tag_quote_level -= fb_quote_level;
305
306 tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, (quote_mode ? "" : "\033[m"));
307 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, tag_output_buf, tag_output_len, line_width);
308
309 fb_quote_level = 0;
310 }
311
312 if (new_line)
313 {
314 continue;
315 }
316
317 tag_start_pos = -1;
318 tag_name_pos = -1;
319 new_line = 1;
320 line_width = -1;
321 }
322 else if (str_in[i] == '\r' || str_in[i] == '\7')
323 {
324 continue; // Skip special characters
325 }
326
327 if (!lml_tag_disabled && str_in[i] == '[')
328 {
329 if (tag_start_pos != -1) // tag is not closed
330 {
331 if (line_width + 1 > width)
332 {
333 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, "\n", 1, line_width);
334 new_line = 1;
335 line_width = 0;
336 i--; // redo at current i
337 continue;
338 }
339
340 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, "[", 1, line_width);
341 i = tag_start_pos; // restart from tag_start_pos + 1
342 tag_start_pos = -1;
343 tag_name_pos = -1;
344 continue;
345 }
346
347 tag_start_pos = i;
348 tag_name_pos = i + 1;
349 }
350 else if (!lml_tag_disabled && str_in[i] == ']' && tag_name_pos >= 0)
351 {
352 tag_end_pos = i;
353
354 // Skip space characters
355 while (str_in[tag_name_pos] == ' ')
356 {
357 tag_name_pos++;
358 }
359
360 for (tag_name_found = 0, k = 0; k < lml_tag_count; k++)
361 {
362 if (strncasecmp(lml_tag_def[k].tag_name, str_in + tag_name_pos, (size_t)lml_tag_name_len[k]) == 0)
363 {
364 tag_param_pos = -1;
365 switch (str_in[tag_name_pos + lml_tag_name_len[k]])
366 {
367 case ' ':
368 tag_name_found = 1;
369 tag_param_pos = tag_name_pos + lml_tag_name_len[k] + 1;
370 while (str_in[tag_param_pos] == ' ')
371 {
372 tag_param_pos++;
373 }
374 strncpy(tag_param_buf, str_in + tag_param_pos, (size_t)MIN(tag_end_pos - tag_param_pos, LML_TAG_PARAM_BUF_LEN));
375 tag_param_buf[MIN(tag_end_pos - tag_param_pos, LML_TAG_PARAM_BUF_LEN)] = '\0';
376 case ']':
377 tag_name_found = 1;
378 if (tag_param_pos == -1 && lml_tag_def[k].tag_output != NULL && lml_tag_def[k].default_param != NULL) // Apply default param if not defined
379 {
380 strncpy(tag_param_buf, lml_tag_def[k].default_param, LML_TAG_PARAM_BUF_LEN - 1);
381 tag_param_buf[LML_TAG_PARAM_BUF_LEN - 1] = '\0';
382 }
383 tag_output_len = 0;
384 if (!quote_mode)
385 {
386 if (lml_tag_def[k].tag_output != NULL)
387 {
388 tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, lml_tag_def[k].tag_output, tag_param_buf);
389 }
390 else if (lml_tag_def[k].tag_filter_cb != NULL)
391 {
392 tag_output_len = lml_tag_def[k].tag_filter_cb(
393 lml_tag_def[k].tag_name, tag_param_buf, tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, 0);
394 }
395 }
396 else // if (quote_mode)
397 {
398 if (lml_tag_def[k].quote_mode_output != NULL)
399 {
400 tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, lml_tag_def[k].quote_mode_output, tag_param_buf);
401 }
402 else if (lml_tag_def[k].tag_filter_cb != NULL)
403 {
404 tag_output_len = lml_tag_def[k].tag_filter_cb(
405 lml_tag_def[k].tag_name, tag_param_buf, tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, 1);
406 }
407 }
408 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, tag_output_buf, tag_output_len, line_width);
409 break;
410 default: // tag_name not match
411 continue;
412 }
413 break;
414 }
415 }
416
417 if (!tag_name_found)
418 {
419 if (line_width + 1 > width)
420 {
421 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, "\n", 1, line_width);
422 new_line = 1;
423 line_width = 0;
424 i--; // redo at current i
425 continue;
426 }
427
428 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, "[", 1, line_width);
429 i = tag_start_pos; // restart from tag_start_pos + 1
430 tag_start_pos = -1;
431 tag_name_pos = -1;
432 continue;
433 }
434
435 tag_start_pos = -1;
436 tag_name_pos = -1;
437 }
438 else if (lml_tag_disabled || tag_name_pos == -1) // not in LML tag
439 {
440 if (line_width + (str_in[i] & 0x80 ? 2 : 1) > width)
441 {
442 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, "\n", 1, line_width);
443 new_line = 1;
444 line_width = 0;
445 i--; // redo at current i
446 continue;
447 }
448
449 tag_output_len = 1;
450 if (str_in[i] & 0x80) // head of multi-byte character
451 {
452 c = (str_in[i] & 0x70) << 1;
453 while (c & 0x80)
454 {
455 if (str_in[i + tag_output_len] == '\0')
456 {
457 break;
458 }
459 tag_output_len++;
460 c = (c & 0x7f) << 1;
461 }
462 }
463
464 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, str_in + i, tag_output_len, line_width);
465 i += (tag_output_len - 1);
466 }
467 else // in LML tag
468 {
469 // Do nothing
470 }
471 }
472
473 if (!lml_tag_disabled && tag_start_pos != -1) // tag is not closed
474 {
475 tag_end_pos = i - 1;
476 tag_output_len = tag_end_pos - tag_start_pos + 1;
477 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, str_in + tag_start_pos, tag_output_len, line_width);
478 }
479
480 if (!quote_mode && !lml_tag_disabled && lml_tag_quote_level > 0)
481 {
482 tag_output_len = snprintf(tag_output_buf, LML_TAG_OUTPUT_BUF_LEN, "\033[m");
483 CHECK_AND_APPEND_OUTPUT(str_out, buf_len, j, tag_output_buf, tag_output_len, line_width);
484 }
485
486 str_out[j] = '\0';
487
488 clock_end = clock();
489 lml_total_exec_duration += (clock_end - clock_begin);
490
491 return j;
492 }

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