tlv: add TLV_GET() and TLV_GET_MINLEN()

Rationale: so far we use code like

  if (TLVP_PRESENT(&tp, VERY_LONG_ENUM_VALUE_NAME_THAT_NEVER_ENDS)) {
  	val = TLVP_VAL(&tp, VERY_LONG_ENUM_VALUE_NAME_THAT_NEVER_ENDS);
	len = TLVP_LEN(&tp, VERY_L0NG_ENUM_VALUE_NAME_TH4T_NEVER_EMDS);
  }

This is a) very long and b) prone to picking the wrong name one of the three
times, which would use the wrong length or val without necessarily being
noticed. A safer and shorter, more readable pattern is:

  struct tlv_p_entry *e = TVLP_GET(&tp, VERY_LONG_ENUM_VALUE_NAME_THAT_NEVER_ENDS);
  if (!e)
        return -ENOENT;
  hexdump(e->val, e->len);

Change-Id: I445de17fc2daa3ab051f5708dd0cc185b23dc048

0 files changed, 0 insertions, 0 deletions