+/*************************************************
+* Find entry point - zero-joined list key *
+*************************************************/
+
+/*
+ * The parameter passed as a key is a list in normal Exim list syntax.
+ * The elements of that list are joined together on NUL, with no trailing
+ * NUL, to form the key.
+ */
+
+static int
+dbmjz_find(void *handle, uschar *filename, uschar *keystring, int length,
+ uschar **result, uschar **errmsg, BOOL *do_cache)
+{
+uschar *key_item, *key_buffer, *key_p;
+uschar *key_elems = keystring;
+int buflen, bufleft, key_item_len, sep = 0;
+
+/* To a first approximation, the size of the lookup key needs to be about,
+or less than, the length of the delimited list passed in + 1. */
+
+buflen = length + 3;
+key_buffer = store_get(buflen);
+
+key_buffer[0] = '\0';
+
+key_p = key_buffer;
+bufleft = buflen;
+
+/* In all cases of an empty list item, we can set 1 and advance by 1 and then
+pick up the trailing NUL from the previous list item, EXCEPT when at the
+beginning of the output string, in which case we need to supply that NUL
+ourselves. */
+while ((key_item = string_nextinlist(&key_elems, &sep, key_p, bufleft)) != NULL)
+ {
+ key_item_len = Ustrlen(key_item) + 1;
+ if (key_item_len == 1)
+ {
+ key_p[0] = '\0';
+ if (key_p == key_buffer)
+ {
+ key_p[1] = '\0';
+ key_item_len += 1;
+ }
+ }
+
+ bufleft -= key_item_len;
+ if (bufleft <= 0)
+ {
+ /* The string_nextinlist() will stop at buffer size, but we should always
+ have at least 1 character extra, so some assumption has failed. */
+ *errmsg = string_copy(US"Ran out of buffer space for joining elements");
+ return DEFER;
+ }
+ key_p += key_item_len;
+ }
+
+if (key_p == key_buffer)
+ {
+ *errmsg = string_copy(US"empty list key");
+ return FAIL;
+ }
+
+/* We do not pass in the final NULL; if needed, the list should include an
+empty element to put one in. Boundary: key length 1, is a NULL */
+key_item_len = key_p - key_buffer - 1;
+
+DEBUG(D_lookup) debug_printf("NUL-joined key length: %d\n", key_item_len);
+
+/* beware that dbmdb_find() adds 1 to length to get back terminating NUL, so
+because we've calculated the real length, we need to subtract one more here */
+return dbmdb_find(handle, filename,
+ key_buffer, key_item_len - 1,
+ result, errmsg, do_cache);
+}
+
+
+
git://git.exim.org / exim.git / commitdiff