/*
 * This library module implements the conversion of UCS2-encoded data
 * (typically received in SMS) into ASCII, ISO 8859-1 or UTF-8,
 * maintaining parallelism with the corresponding function for decoding
 * GSM7-encoded data.
 */

#include <sys/types.h>

ucs2_to_ascii_or_ext(inbuf, inlen, outbuf, outlenp, ascii_ext, newline_ok, errp)
	u_char *inbuf, *outbuf;
	unsigned inlen, *outlenp, *errp;
{
	u_char *inp, *endp, *outp;
	unsigned errcnt = 0;
	unsigned uni;

	inp = inbuf;
	endp = inbuf + (inlen & ~1);
	outp = outbuf;
	while (inp < endp) {
		uni = (inp[0] << 8) | inp[1];
		inp += 2;
		if (uni == '\r') {
			*outp++ = '\\';
			*outp++ = 'r';
			errcnt++;
		} else if (uni == '\n') {
			if (newline_ok)
				*outp++ = '\n';
			else {
				*outp++ = '\\';
				*outp++ = 'n';
				errcnt++;
			}
		} else if (!is_decoded_char_ok(uni, ascii_ext)) {
			*outp++ = '?';
			errcnt++;
		} else if (ascii_ext == 2)
			outp += emit_utf8_char(uni, outp);
		else
			*outp++ = uni;
	}
	*outp = '\0';
	if (outlenp)
		*outlenp = outp - outbuf;
	if (errp)
		*errp = errcnt;
}