Function validate_key_name

key.cpp:311–335

}

bool validate_key_name (const char* key_name, std::string* reason)
{
	if (!*key_name) {
		if (reason) { *reason = "Key name may not be empty"; }
		return false;
	}

	if (std::strcmp(key_name, "default") == 0) {
		if (reason) { *reason = "`default' is not a legal key name"; }
		return false;
	}
	// Need to be restrictive with key names because they're used as part of a Git filter name
	size_t		len = 0;
	while (char c = *key_name++) {
		if (!std::isalnum(c) && c != '-' && c != '_') {
			if (reason) { *reason = "Key names may contain only A-Z, a-z, 0-9, '-', and '_'"; }
			return false;
		}
		if (++len > KEY_NAME_MAX_LEN) {
			if (reason) { *reason = "Key name is too long"; }
			return false;
		}
	}
	return true;
}