broadband-modem: update CMGL parsing logic

Pantech UMW190 modem uses a custom +CMGL response which includes only
three fields before the actual PDU, e.g:

  +CMGL: <index>,<status>,<something>\r\n<PDU>

instead of what we had before:

  +CMGL: <index>,<status>,<alpha>,<length>\r\n<PDU>

The CMGL parsing logic is now updated to use a regex to match the reply, and
also considering the UMW190 specific case.

Actually, we end up reading only the two first fields (index and status) which
are the ones we really need, so we skip the <length> and the <alpha> if given.

Added also unit tests to cover all these known cases.

Partially fixes https://bugzilla.gnome.org/show_bug.cgi?id=696723 (missing the
actual PDU parsing fixes).

1 files changed, 11 insertions, 0 deletions

diff --git a/src/mm-modem-helpers.h b/src/mm-modem-helpers.h
index aa646993..eb02337e 100644
--- a/src/mm-modem-helpers.h
+++ b/src/mm-modem-helpers.h
@@ -150,6 +150,17 @@ gint         mm_3gpp_cind_response_get_max       (MM3gppCindResponse *r);
 GByteArray *mm_3gpp_parse_cind_read_response (const gchar *reply,
                                               GError **error);
 
+/* AT+CMGL=4 (list sms parts) response parser */
+typedef struct {
+    gint index;
+    gint status;
+    gchar *pdu;
+} MM3gppPduInfo;
+void   mm_3gpp_pdu_info_list_free      (GList *info_list);
+GList *mm_3gpp_parse_pdu_cmgl_response (const gchar *str,
+                                        GError **error);
+
+
 /* Additional 3GPP-specific helpers */
 
 MMModem3gppFacility mm_3gpp_acronym_to_facility (const gchar *str);