ss="func" href="foreign-streams.html#Ssetenc()">Ssetenc() which is available from Prolog using the set_stream/2encoding(Encoding) property. Functions that explicitly manage the encoding are:

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.

int ScheckBOM(IOSTREAM *s)

This function may be called on a buffered input stream immediately after opening the stream. If the stream starts with a known Byte Order Mark (BOM) the encoding is set accordingly and the flag SIO_BOM is set on the stream. Possibly resulting en