1 /* recdb.c - recursive/record database implementation
2 * Copyright 2000-2004 srvx Development Team
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version. Important limitations are
8 * listed in the COPYING file that accompanies this software.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, email srvx-maintainers@srvx.net.
25 #ifdef HAVE_SYS_MMAN_H
28 #ifdef HAVE_SYS_STAT_H
33 #define MMAP_MAP_LENGTH (getpagesize()*1024)
35 /* file format (grammar in Backus-Naur Form):
38 * record := qstring [ '=' ] ( qstring | object | stringlist ) ';'
39 * qstring := '"' ( [^\\] | ('\\' [\\n]) )* '"'
40 * object := '{' record* '}'
41 * stringlist := '(' [ qstring [',' qstring]* ] ')'
45 /* when a database or object is read from disk, it is represented as
46 * a dictionary object, keys are names (what's left of the '=') and
47 * values are 'struct record_data's
50 struct recdb_context {
61 typedef struct recdb_file {
63 FILE *f; /* For RECDB_FILE, RECDB_MMAP */
64 char *s; /* For RECDB_STRING, RECDB_MMAP */
65 enum recdb_filetype type;
68 struct recdb_context ctx;
72 typedef struct recdb_outfile {
73 FILE *f; /* For RECDB_FILE, RECDB_MMAP */
74 char *s; /* For RECDB_STRING, RECDB_MMAP */
76 struct { /* For RECDB_STRING */
80 struct { /* For RECDB_MMAP */
85 enum recdb_filetype type;
94 static int mmap_error=0;
100 #define ABORT(recdb, code, ch) longjmp((recdb)->env, ((code) << 8) | (ch))
103 ABORT(RECDB *recdb, int code, unsigned char ch) {
104 longjmp(recdb->env, code << 8 | ch);
114 EXPECTED_START_RECORD_DATA,
119 static void parse_record_int(RECDB *recdb, char **pname, struct record_data **prd);
121 /* allocation functions */
123 #define alloc_record_data_int() malloc(sizeof(struct record_data))
126 alloc_record_data_qstring(const char *string)
128 struct record_data *rd;
129 rd = alloc_record_data_int();
130 SET_RECORD_QSTRING(rd, string);
135 alloc_record_data_object(dict_t obj)
137 struct record_data *rd;
138 rd = alloc_record_data_int();
139 SET_RECORD_OBJECT(rd, obj);
144 alloc_record_data_string_list(struct string_list *slist)
146 struct record_data *rd;
147 rd = alloc_record_data_int();
148 SET_RECORD_STRING_LIST(rd, slist);
153 alloc_string_list(int size)
155 struct string_list *slist;
156 slist = malloc(sizeof(struct string_list));
159 slist->list = slist->size ? malloc(size*sizeof(char*)) : NULL;
166 dict_t db = dict_new();
167 dict_set_free_data(db, free_record_data);
171 /* misc. operations */
174 string_list_append(struct string_list *slist, char *string)
176 if (slist->used == slist->size) {
179 slist->list = realloc(slist->list, slist->size*sizeof(char*));
182 slist->list = malloc(slist->size*sizeof(char*));
185 slist->list[slist->used++] = string;
189 string_list_copy(struct string_list *slist)
191 struct string_list *new_list;
193 new_list = alloc_string_list(slist->size);
194 new_list->used = slist->used;
195 for (i=0; i<new_list->used; i++) {
196 new_list->list[i] = strdup(slist->list[i]);
201 int slist_compare_two(const void *pa, const void *pb)
203 return irccasecmp(*(const char**)pa, *(const char **)pb);
207 string_list_sort(struct string_list *slist)
209 qsort(slist->list, slist->used, sizeof(slist->list[0]), slist_compare_two);
213 database_get_path(dict_t db, const char *path)
215 char *new_path = strdup(path), *orig_path = new_path;
217 struct record_data *rd;
219 for (part=new_path; *new_path; new_path++) {
220 if (*new_path != '/') continue;
223 rd = dict_find(db, part, NULL);
224 if (!rd || rd->type != RECDB_OBJECT) {
233 rd = dict_find(db, part, NULL);
239 database_get_data(dict_t db, const char *path, enum recdb_type type)
241 struct record_data *rd = database_get_path(db, path);
242 return (rd && rd->type == type) ? rd->d.whatever : NULL;
248 free_string_list(struct string_list *slist)
253 for (i=0; i<slist->used; i++)
254 free(slist->list[i]);
260 free_record_data(void *rdata)
262 struct record_data *r = rdata;
264 case RECDB_INVALID: break;
265 case RECDB_QSTRING: free(r->d.qstring); break;
266 case RECDB_OBJECT: dict_delete(r->d.object); break;
267 case RECDB_STRING_LIST: free_string_list(r->d.slist); break;
272 /* parse functions */
277 switch (recdb->type) {
279 return feof(recdb->f);
285 return ((size_t)recdb->pos >= recdb->length);
297 switch (recdb->type) {
299 res = fgetc(recdb->f);
303 res = dbeof(recdb) ? EOF : recdb->s[recdb->pos++];
309 if (res == EOL) recdb->ctx.line++, recdb->ctx.col=1;
310 else if (res != EOF) recdb->ctx.col++;
315 dbungetc(int c, RECDB *recdb)
317 switch (recdb->type) {
323 recdb->s[--recdb->pos] = c;
326 if (c == EOL) recdb->ctx.line--, recdb->ctx.col=-1;
327 else recdb->ctx.col--;
330 /* returns first non-whitespace, non-comment character (-1 for EOF found) */
332 parse_skip_ws(RECDB *recdb)
334 int c, d, in_comment = 0;
335 while (!dbeof(recdb)) {
337 if (c == EOF) return EOF;
338 if (isspace(c)) continue;
339 if (c != '/') return c;
340 if ((d = dbgetc(recdb)) == '*') {
341 /* C style comment, with slash star comment star slash */
346 } while (c != '*' && c != EOF);
347 if ((c = dbgetc(recdb)) == '/') in_comment = 0;
348 } while (in_comment);
349 } else if (d == '/') {
350 /* C++ style comment, with slash slash comment newline */
353 } while (c != EOF && c != EOL);
355 if (d != EOF) dbungetc(d, recdb);
363 parse_qstring(RECDB *recdb)
366 int used=0, size=8, c;
367 struct recdb_context start_ctx;
370 if ((c = parse_skip_ws(recdb)) == EOF) return NULL;
371 start_ctx = recdb->ctx;
372 if (c != '"') ABORT(recdb, EXPECTED_OPEN_QUOTE, c);
374 while (!dbeof(recdb) && (c = dbgetc(recdb)) != '"') {
376 /* There should never be a literal newline, as it is saved as a \n */
379 ABORT(recdb, UNTERMINATED_STRING, ' ');
383 switch (c = dbgetc(recdb)) {
384 case '0': /* \<octal>, 000 through 377 */
393 char digits[3] = { (char)c, '\0', '\0' };
394 for (i=1; i < 3; i++) {
395 /* Maximum of \377, so there's a max of 2 digits
396 * if digits[0] > '3' (no \400, but \40 is fine) */
397 if (i == 2 && digits[0] > '3') {
400 if ((c = dbgetc(recdb)) == EOF) {
403 if ((c < '0') || (c > '7')) {
410 c = (int)strtol(digits, NULL, 8);
419 char digits[3] = { '\0', '\0', '\0' };
420 for (i=0; i < 2; i++) {
421 if ((c = dbgetc(recdb)) == EOF) {
431 c = (int)strtol(digits, NULL, 16);
439 case 'a': buff[used++] = '\a'; break;
440 case 'b': buff[used++] = '\b'; break;
441 case 't': buff[used++] = '\t'; break;
442 case 'n': buff[used++] = EOL; break;
443 case 'v': buff[used++] = '\v'; break;
444 case 'f': buff[used++] = '\f'; break;
445 case 'r': buff[used++] = '\r'; break;
446 case '\\': buff[used++] = '\\'; break;
447 case '"': buff[used++] = '"'; break;
448 default: buff[used++] = '\\'; buff[used++] = c; break;
453 buff = realloc(buff, size);
456 if (c != '"' && dbeof(recdb)) {
458 recdb->ctx = start_ctx;
459 ABORT(recdb, UNTERMINATED_STRING, EOF);
466 parse_object(RECDB *recdb)
470 struct record_data *rd;
472 if ((c = parse_skip_ws(recdb)) == EOF) return NULL;
473 if (c != '{') ABORT(recdb, EXPECTED_OPEN_BRACE, c);
474 obj = alloc_object();
475 dict_set_free_keys(obj, free);
476 while (!dbeof(recdb)) {
477 if ((c = parse_skip_ws(recdb)) == '}') break;
480 parse_record_int(recdb, &name, &rd);
481 dict_insert(obj, name, rd);
487 parse_string_list(RECDB *recdb)
489 struct string_list *slist;
491 if ((c = parse_skip_ws(recdb)) == EOF) return NULL;
492 if (c != '(') ABORT(recdb, EXPECTED_OPEN_PAREN, c);
493 slist = alloc_string_list(4);
495 c = parse_skip_ws(recdb);
496 if (c == EOF || c == ')') break;
498 string_list_append(slist, parse_qstring(recdb));
499 c = parse_skip_ws(recdb);
500 if (c == EOF || c == ')') break;
501 if (c != ',') ABORT(recdb, EXPECTED_COMMA, c);
507 parse_record_int(RECDB *recdb, char **pname, struct record_data **prd)
510 *pname = parse_qstring(recdb);
511 c = parse_skip_ws(recdb);
515 ABORT(recdb, EXPECTED_RECORD_DATA, EOF);
517 if (c == '=') c = parse_skip_ws(recdb);
519 *prd = malloc(sizeof(**prd));
522 /* Don't use SET_RECORD_QSTRING, since that does an extra strdup() of the string. */
523 (*prd)->type = RECDB_QSTRING;
524 (*prd)->d.qstring = parse_qstring(recdb);
526 case '{': SET_RECORD_OBJECT(*prd, parse_object(recdb)); break;
527 case '(': SET_RECORD_STRING_LIST(*prd, parse_string_list(recdb)); break;
528 default: ABORT(recdb, EXPECTED_START_RECORD_DATA, c);
530 if ((c = parse_skip_ws(recdb)) != ';') ABORT(recdb, EXPECTED_SEMICOLON, c);
534 parse_database_int(RECDB *recdb)
537 struct record_data *rd;
538 dict_t db = alloc_database();
539 dict_set_free_keys(db, free);
540 while (!dbeof(recdb)) {
541 parse_record_int(recdb, &name, &rd);
542 if (name) dict_insert(db, name, rd);
548 failure_reason(int code)
552 case UNTERMINATED_STRING: reason = "Unterminated string"; break;
553 case EXPECTED_OPEN_QUOTE: reason = "Expected '\"'"; break;
554 case EXPECTED_OPEN_BRACE: reason = "Expected '{'"; break;
555 case EXPECTED_OPEN_PAREN: reason = "Expected '('"; break;
556 case EXPECTED_COMMA: reason = "Expected ','"; break;
557 case EXPECTED_START_RECORD_DATA: reason = "Expected start of some record data"; break;
558 case EXPECTED_SEMICOLON: reason = "Expected ';'"; break;
559 case EXPECTED_RECORD_DATA: reason = "Expected record data"; break;
560 default: reason = "Unknown error";
562 if (code == -1) reason = "Premature end of file";
567 explain_failure(RECDB *recdb, int code)
569 log_module(MAIN_LOG, LOG_ERROR, "%s (got '%c') at %s line %d column %d.",
570 failure_reason(code), code & 255,
571 recdb->source, recdb->ctx.line, recdb->ctx.col);
575 parse_record(const char *text, char **pname, struct record_data **prd)
581 recdb.source = "<user-supplied text>";
583 recdb.s = strdup(text);
584 recdb.length = strlen(text);
586 recdb.type = RECDB_STRING;
587 recdb.ctx.line = recdb.ctx.col = 1;
588 if ((res = setjmp(recdb.env)) == 0) {
589 parse_record_int(&recdb, pname, prd);
594 return failure_reason(res);
599 parse_database(const char *filename)
604 struct stat statinfo;
606 recdb.source = filename;
607 if (!(recdb.f = fopen(filename, "r"))) {
608 log_module(MAIN_LOG, LOG_ERROR, "Unable to open database file '%s' for reading: %s", filename, strerror(errno));
612 if (fstat(fileno(recdb.f), &statinfo)) {
613 log_module(MAIN_LOG, LOG_ERROR, "Unable to fstat database file '%s': %s", filename, strerror(errno));
616 recdb.length = (size_t)statinfo.st_size;
620 if (!mmap_error && (recdb.s = mmap(NULL, recdb.length, PROT_READ|PROT_WRITE, MAP_PRIVATE, fileno(recdb.f), 0)) != MAP_FAILED) {
621 recdb.type = RECDB_MMAP;
623 /* Fall back to stdio */
625 log_module(MAIN_LOG, LOG_WARNING, "Unable to mmap database file '%s' (falling back to stdio): %s", filename, strerror(errno));
632 recdb.type = RECDB_FILE;
635 recdb.ctx.line = recdb.ctx.col = 1;
638 if ((res = setjmp(recdb.env)) == 0) {
639 db = parse_database_int(&recdb);
641 explain_failure(&recdb, res);
645 switch (recdb.type) {
648 munmap(recdb.s, recdb.length);