- adns_status (*qdparselabel)(adns_state ads,
- const char **p_io, const char *pe, int labelnum,
- char label_r[DNS_MAXDOMAIN], int *ll_io,
- adns_queryflags flags,
- const struct typeinfo *typei);
- /* Parses one label from the query domain string. On entry, *p_io
- * points to the next character to parse and *ll_io is the size of
- * the buffer. pe points just after the end of the query domain
- * string. On successful return, label_r[] and *ll_io are filled in
- * and *p_io points to *pe or just after the label-ending `.'. */
+ adns_status (*checklabel)(adns_state ads, adns_queryflags flags,
+ union checklabel_state *css, qcontext *ctx,
+ int labnum, const char *label, int lablen);
+ /* Check a label from the query domain string. The label is not
+ * necessarily null-terminated. The query has not yet been constructed,
+ * and this hook can refuse its submission by returning a nonzero status.
+ * State can be stored in *css between calls, and useful information can be
+ * stashed in ctx->tinfo, to be stored with the query (e.g., it will be
+ * available to the parse hook). This hook can detect a first call because
+ * labnum is zero, and a final call because lablen is zero.
+ */