12.9.5 Foreign stream encoding
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Availability:C-language interface function
int Ssetenc(IOSTREAM *s, IOENC new_enc, IOENC *old_enc)
Set the encoding for s to new_enc and, if old_enc is not NULL, return the old encoding. This function may fail, returning -1 if the Scontrol_function() of the stream returns -1 on the SIO_SETENCODING request. On succcess it returns 0. If new_enc is ENC_OCTET the stream is switched to binary mode. Otherwise text mode is enabled.