Function do_parse_config_key

config.c:545–608

* Auxiliary function to sanity-check and split the key into the section * identifier and variable name. * * Returns 0 on success, -1 when there is an invalid character in the key and * -2 if there is no section name in the key. * * store_key - pointer to char* which will hold a copy of the key with * lowercase section and variable name, can be NULL to skip * allocat

 * quiet - when non-zero, suppress error() reports on rejection
 */
static int do_parse_config_key(const char *key, char **store_key,
			       size_t *baselen_, int quiet)
{
	size_t i, baselen;
	int dot;
	const char *last_dot = strrchr(key, '.');

	/*
	 * Since "key" actually contains the section name and the real
	 * key name separated by a dot, we have to know where the dot is.
	 */

	if (last_dot == NULL || last_dot == key) {
		if (!quiet)
			error(_("key does not contain a section: %s"), key);
		return -CONFIG_NO_SECTION_OR_NAME;
	}

	if (!last_dot[1]) {
		if (!quiet)
			error(_("key does not contain variable name: %s"), key);
		return -CONFIG_NO_SECTION_OR_NAME;
	}

	baselen = last_dot - key;
	if (baselen_)
		*baselen_ = baselen;

	/*
	 * Validate the key and while at it, lower case it for matching.
	 */
	if (store_key)
		*store_key = xmallocz(strlen(key));

	dot = 0;
	for (i = 0; key[i]; i++) {
		unsigned char c = key[i];
		if (c == '.')
			dot = 1;
		/* Leave the extended basename untouched.. */
		if (!dot || i > baselen) {
			if (!iskeychar(c) ||
			    (i == baselen + 1 && !isalpha(c))) {
				if (!quiet)
					error(_("invalid key: %s"), key);
				goto out_free_ret_1;
			}
			c = tolower(c);
		} else if (c == '\n') {
			if (!quiet)
				error(_("invalid key (newline): %s"), key);
			goto out_free_ret_1;
		}
		if (store_key)
			(*store_key)[i] = c;
	}

	return 0;