gnutls_x509_rdn_get - API function
int gnutls_x509_rdn_get(const gnutls_datum_t * idn, char * buf, size_t * buf_size);
This function will return the name of the given RDN sequence. The name will be in the form "C=xxxx,O=yyyy,CN=zzzz" as described in RFC4514.
This function does not output a fully RFC4514 compliant string, if that is required see gnutls_x509_rdn_get2().
On success, GNUTLS_E_SUCCESS (0) is returned, or GNUTLS_E_SHORT_MEMORY_BUFFER is returned and * buf_size is updated if the provided buffer is not long enough, otherwise a negative error value.
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