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int Ns_DStringLength(
Ns_DString *dsPtr
);
The Ns_DStringLength macro returns the current length of the Ns_DString.
Ns_DString ds;
Ns_DStringInit(&ds);
Ns_DStringAppend(&ds, "<html></html>");
printf("len=%d\n", Ns_DStringLength(&ds));
Ns_DStringFree(&ds); /* finished with dstring */