PX_strdup — duplicate a string
       #include <paradox.h>
       char * PX_strdup(pxdoc_t *pxdoc, const char *str)
       Duplicates  a  string  like  strdup(3)  but  uses the memory allocation
       function as passed to PX_new2(3).
       Returns pointer to string on success and NULL on failure.
       PX_new2(3)
       This manual page was written by Uwe Steinmann uwe@steinmann.cx.