I am confused by the multi dimensions pointer of the module configure
structure

if (cmd->type & NGX_DIRECT_CONF) {
conf = ((void **) cf->ctx)[ngx_modules[i]->index];

} else if (cmd->type & NGX_MAIN_CONF) {
conf = &(((void **) cf->ctx)[ngx_modules[i]->index]);

} else if (cf->ctx) {
confp = *(void **) ((char *) cf->ctx + cmd->conf);

if (confp) {
conf = confp[ngx_modules[i]->ctx_index];
}
}

rv = cmd->set(cf, cmd, conf);
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