add tlv_parse2(), capable of multiple instances of the same IE
Allow passing multiple struct tlv_parsed in an array, to allow parsing as many
repeated IEs as are expected by the caller.
From tlv_parse(), call tlv_parse2() with dec_multiple = 1 to yield the previous
behavior. tlv_parse() remains valid API.
An example of multiple IEs is the BSSMAP Handover Request, containing Cell
Identifier (Serving) and Cell Identifier (Target), both defined by 3GPP TS
48.008 3.2.2.17 with identical IE tags; both are mandatory.
Related: OS#2283 (inter-BSC HO, BSC side)
Change-Id: Id04008eaf0a1cafdbdc11b7efc556e3035b1c84d
diff --git a/include/osmocom/gsm/tlv.h b/include/osmocom/gsm/tlv.h
index 8654893..996f6aa 100644
--- a/include/osmocom/gsm/tlv.h
+++ b/include/osmocom/gsm/tlv.h
@@ -433,6 +433,9 @@
const uint8_t *buf, int buf_len);
int tlv_parse(struct tlv_parsed *dec, const struct tlv_definition *def,
const uint8_t *buf, int buf_len, uint8_t lv_tag, uint8_t lv_tag2);
+int tlv_parse2(struct tlv_parsed *dec, int dec_multiples,
+ const struct tlv_definition *def, const uint8_t *buf, int buf_len,
+ uint8_t lv_tag, uint8_t lv_tag2);
/* take a master (src) tlv def and fill up all empty slots in 'dst' */
void tlv_def_patch(struct tlv_definition *dst, const struct tlv_definition *src);