2  * read.c - read the blkid cache from disk, to avoid scanning all devices
7  * %Begin-Header%
10  * %End-Header%
44 static void debug_dump_dev(blkid_dev dev);
62 static char *skip_over_blank(char *cp)  in skip_over_blank()
69 static char *skip_over_word(char *cp)  in skip_over_word()
89 static char *strip_line(char *line)  in strip_line()
95 	p = line + strlen(line) - 1;  in strip_line()
99 			*p-- = '\0';  in strip_line()
108 static char *parse_word(char **buf)
119 		char *end = next - 1;
135  * line starts with "<device" return 1 -> continue parsing line
136  * line starts with "<foo", empty, or # return 0 -> skip line
137  * line starts with other, return -BLKID_ERR_CACHE -> error
139 static int parse_start(char **cp)  in parse_start()
152 		DBG(DEBUG_READ, printf("found device header: %8s\n", p));  in parse_start()
162 	return -BLKID_ERR_CACHE;  in parse_start()
166 static int parse_end(char **cp)  in parse_end()
171 		DBG(DEBUG_READ, printf("found device trailer %9s\n", *cp));  in parse_end()
176 	return -BLKID_ERR_CACHE;  in parse_end()
185 static int parse_dev(blkid_cache cache, blkid_dev *dev, char **cp)  in parse_dev()
195 		DBG(DEBUG_READ,  in parse_dev()
197 		return -BLKID_ERR_CACHE;  in parse_dev()
202 	DBG(DEBUG_READ, printf("device should be %.*s\n",  in parse_dev()
203 			       (int)(end - start), start));  in parse_dev()
213 		DBG(DEBUG_READ,  in parse_dev()
218 	if (end - start <= 1) {  in parse_dev()
219 		DBG(DEBUG_READ, printf("blkid: empty device name: %s\n", *cp));  in parse_dev()
220 		return -BLKID_ERR_CACHE;  in parse_dev()
223 	name = blkid_strndup(start, end-start);  in parse_dev()
225 		return -BLKID_ERR_MEM;  in parse_dev()
227 	DBG(DEBUG_READ, printf("found dev %s\n", name));  in parse_dev()
231 		return -BLKID_ERR_MEM;  in parse_dev()
241 static int parse_token(char **name, char **value, char **cp)  in parse_token()
246 		return -BLKID_ERR_PARAM;  in parse_token()
258 			DBG(DEBUG_READ,  in parse_token()
261 			return -BLKID_ERR_CACHE;  in parse_token()
282 static int parse_xml(char **name, char **value, char **cp)
287 		return -BLKID_ERR_PARAM;
303  * Return -ve error code.
305 static int parse_tag(blkid_cache cache, blkid_dev dev, char **cp)  in parse_tag()
312 		return -BLKID_ERR_PARAM;  in parse_tag()
320 		dev->bid_devno = STRTOULL(value, 0, 0);  in parse_tag()
322 		dev->bid_pri = strtol(value, 0, 0);  in parse_tag()
324 		dev->bid_time = STRTOULL(value, 0, 0);  in parse_tag()
328 	DBG(DEBUG_READ, printf("    tag: %s=\"%s\"\n", name, value));  in parse_tag()
339  * Returns -ve value on error.
341  * If a valid device was read, *dev_p is non-NULL, otherwise it is NULL
344 static int blkid_parse_line(blkid_cache cache, blkid_dev *dev_p, char *cp)  in blkid_parse_line()
350 		return -BLKID_ERR_PARAM;  in blkid_parse_line()
354 	DBG(DEBUG_READ, printf("line: %s\n", cp));  in blkid_parse_line()
365 	if (dev->bid_type == NULL) {  in blkid_parse_line()
366 		DBG(DEBUG_READ,  in blkid_parse_line()
367 		    printf("blkid: device %s has no TYPE\n",dev->bid_name));  in blkid_parse_line()
371 	DBG(DEBUG_READ, blkid_debug_dump_dev(dev));  in blkid_parse_line()
395 	if ((fd = open(cache->bic_filename, O_RDONLY)) < 0)  in blkid_read_cache()
399 	if ((st.st_mtime == cache->bic_ftime) ||  in blkid_read_cache()
400 	    (cache->bic_flags & BLKID_BIC_FL_CHANGED)) {  in blkid_read_cache()
401 		DBG(DEBUG_CACHE, printf("skipping re-read of %s\n",  in blkid_read_cache()
402 					cache->bic_filename));  in blkid_read_cache()
406 	DBG(DEBUG_CACHE, printf("reading cache file %s\n",  in blkid_read_cache()
407 				cache->bic_filename));  in blkid_read_cache()
420 		end = strlen(buf) - 1;  in blkid_read_cache()
422 		while (buf[end] == '\\' && end < sizeof(buf) - 2 &&  in blkid_read_cache()
423 		       fgets(buf + end, sizeof(buf) - end, file)) {  in blkid_read_cache()
424 			end = strlen(buf) - 1;  in blkid_read_cache()
429 			DBG(DEBUG_READ,  in blkid_read_cache()
439 	cache->bic_flags &= ~BLKID_BIC_FL_CHANGED;  in blkid_read_cache()
440 	cache->bic_ftime = st.st_mtime;  in blkid_read_cache()
449 static void debug_dump_dev(blkid_dev dev)  in debug_dump_dev()
458 	printf("  dev: name = %s\n", dev->bid_name);  in debug_dump_dev()
459 	printf("  dev: DEVNO=\"0x%0llx\"\n", (long long)dev->bid_devno);  in debug_dump_dev()
460 	printf("  dev: TIME=\"%lld\"\n", (long long)dev->bid_time);  in debug_dump_dev()
461 	printf("  dev: PRI=\"%d\"\n", dev->bid_pri);  in debug_dump_dev()
462 	printf("  dev: flags = 0x%08X\n", dev->bid_flags);  in debug_dump_dev()
464 	list_for_each(p, &dev->bid_tags) {  in debug_dump_dev()
467 			printf("    tag: %s=\"%s\"\n", tag->bit_name,  in debug_dump_dev()
468 			       tag->bit_val);  in debug_dump_dev()
483 			"Test parsing of the cache (filename)\n", argv[0]);  in main()