1 files changed, 152 insertions, 0 deletions
diff --git a/lib/names.c b/lib/names.c
new file mode 100644
index 0000000..b46ea79
--- /dev/null
+++ b/lib/names.c
@@ -0,0 +1,152 @@
+/*
+ * names.c		db names
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include "names.h"
+#include "utils.h"
+
+#define MAX_ENTRIES  256
+#define NAME_MAX_LEN 512
+
+static int read_id_name(FILE *fp, int *id, char *name)
+{
+	char buf[NAME_MAX_LEN];
+	int min, maj;
+
+	while (fgets(buf, sizeof(buf), fp)) {
+		char *p = buf;
+
+		while (*p == ' ' || *p == '\t')
+			p++;
+
+		if (*p == '#' || *p == '\n' || *p == 0)
+			continue;
+
+		if (sscanf(p, "%x:%x %s\n", &maj, &min, name) == 3) {
+			*id = (maj << 16) | min;
+		} else if (sscanf(p, "%x:%x %s #", &maj, &min, name) == 3) {
+			*id = (maj << 16) | min;
+		} else if (sscanf(p, "0x%x %s\n", id, name) != 2 &&
+				sscanf(p, "0x%x %s #", id, name) != 2 &&
+				sscanf(p, "%d %s\n", id, name) != 2 &&
+				sscanf(p, "%d %s #", id, name) != 2) {
+			strcpy(name, p);
+			return -1;
+		}
+		return 1;
+	}
+
+	return 0;
+}
+
+struct db_names *db_names_alloc(void)
+{
+	struct db_names *db;
+
+	db = calloc(1, sizeof(*db));
+	if (!db)
+		return NULL;
+
+	db->size = MAX_ENTRIES;
+	db->hash = calloc(db->size, sizeof(struct db_entry *));
+
+	return db;
+}
+
+int db_names_load(struct db_names *db, const char *path)
+{
+	struct db_entry *entry;
+	FILE *fp;
+	int id;
+	char namebuf[NAME_MAX_LEN] = {0};
+	int ret = -1;
+
+	fp = fopen(path, "r");
+	if (!fp)
+		return -ENOENT;
+
+	while ((ret = read_id_name(fp, &id, &namebuf[0]))) {
+		if (ret == -1) {
+			fprintf(stderr, "Database %s is corrupted at %s\n",
+					path, namebuf);
+			goto Exit;
+		}
+		ret = -1;
+
+		if (id < 0)
+			continue;
+
+		entry = malloc(sizeof(*entry));
+		if (!entry)
+			goto Exit;
+
+		entry->name = strdup(namebuf);
+		if (!entry->name) {
+			free(entry);
+			goto Exit;
+		}
+
+		entry->id   = id;
+		entry->next = db->hash[id & (db->size - 1)];
+		db->hash[id & (db->size - 1)] = entry;
+	}
+	ret = 0;
+
+Exit:
+	fclose(fp);
+	return ret;
+}
+
+void db_names_free(struct db_names *db)
+{
+	int i;
+
+	if (!db)
+		return;
+
+	for (i = 0; i < db->size; i++) {
+		struct db_entry *entry = db->hash[i];
+
+		while (entry) {
+			struct db_entry *next = entry->next;
+
+			free(entry->name);
+			free(entry);
+			entry = next;
+		}
+	}
+
+	free(db->hash);
+	free(db);
+}
+
+char *id_to_name(struct db_names *db, int id, char *name)
+{
+	struct db_entry *entry;
+
+	if (!db)
+		return NULL;
+
+	entry = db->hash[id & (db->size - 1)];
+	while (entry && entry->id != id)
+		entry = entry->next;
+
+	if (entry) {
+		strncpy(name, entry->name, IDNAME_MAX);
+		return name;
+	}
+
+	snprintf(name, IDNAME_MAX, "%d", id);
+	return NULL;
+}