+int yaz_srw_sortkeys_to_sort_spec(const char *srw_sortkeys, WRBUF w)
+{
+ /* sru sortkey layout: path,schema,ascending,caseSensitive,missingValue */
+ /* see cql_sortby_to_sortkeys of YAZ. */
+ char **sortspec;
+ int num_sortspec = 0;
+ int i;
+ NMEM nmem = nmem_create();
+
+ if (srw_sortkeys)
+ nmem_strsplit_blank(nmem, srw_sortkeys, &sortspec, &num_sortspec);
+ if (num_sortspec > 0)
+ {
+ for (i = 0; i < num_sortspec; i++)
+ {
+ char **arg;
+ int num_arg;
+ int ascending = 1;
+ int case_sensitive = 0;
+ const char *missing = 0;
+ nmem_strsplitx(nmem, ",", sortspec[i], &arg, &num_arg, 0);
+
+ if (num_arg > 2 && arg[2][0])
+ ascending = atoi(arg[2]);
+ if (num_arg > 3 && arg[3][0])
+ case_sensitive = atoi(arg[3]);
+ if (num_arg > 4 && arg[4][0])
+ missing = arg[4];
+
+ if (i)
+ wrbuf_puts(w, " ");
+
+ wrbuf_puts(w, arg[0]); /* field */
+ wrbuf_puts(w, " ");
+
+ wrbuf_puts(w, ascending ? "a" : "d");
+ wrbuf_puts(w, case_sensitive ? "s" : "i");
+ if (missing)
+ {
+ if (!strcmp(missing, "omit"))
+ ;
+ else if (!strcmp(missing, "abort"))
+ wrbuf_puts(w, "!");
+ else if (!strcmp(missing, "lowValue"))
+ ;
+ else if (!strcmp(missing, "highValue"))
+ ;
+ else
+ {
+ wrbuf_puts(w, "=");
+ wrbuf_puts(w, missing);
+ }
+ }
+ }
+ }
+ nmem_destroy(nmem);
+ return 0;
+}