Introduce osmo_identifier_valid() function to check validity of identifier
We define the notion of an 'osmocom identifier' which is basically a
7-bit US-ASCII without any special characters beyond "-_:@". We
introduce a function to verify if an identifier consists only of the
permitted characters.
Change-Id: I96a8d345c5a69238a12d040f39b70c485a5c421c
diff --git a/src/utils.c b/src/utils.c
index 534916b..ef8e916 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -22,6 +22,7 @@
*/
+#include <stdbool.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
@@ -411,6 +412,33 @@
return false;
if (require_even && (len & 1))
return false;
+
+ return true;
+}
+
+/*! Determine if a given identifier is valid, i.e. doesn't contain illegal chars
+ * \param[in] str String to validate
+ * \returns true in case string contains valid identifier, false otherwise
+ */
+bool osmo_identifier_valid(const char *str)
+{
+ /* characters that are illegal in names */
+ static const char illegal_chars[] = "., {}[]()<>|~\\^`'\"?=;/+*&%$#!";
+ unsigned int i;
+
+ /* an empty string is not a valid identifier */
+ if (!str || strlen(str) == 0)
+ return false;
+
+ for (i = 0; i < strlen(str); i++) {
+ /* check for 7-bit ASCII */
+ if (str[i] & 0x80)
+ return false;
+ /* check for some explicit reserved control characters */
+ if (strchr(illegal_chars, str[i]))
+ return false;
+ }
+
return true;
}