/* /lib/rfc/rfc2781, also translates \n to \r\n */#include <u.h>#include <libc.h>#include "dat.h"#include "fns.h" enum{	Bits10 = 0x03FF,	Bits16 = 0xFFFF,	Bits20 = 0x0FFFFF,	HHalfZoneS = 0xD800,	HHalfZoneE = 0xDBFF,	LHalfZoneS = 0xDC00,	LHalfZoneE = 0xDFFF,}; inttoutf16(uchar* buf, int nb, char* s, int ns){	uchar *b, *eb;	char *es;	Rune r; 	b = buf;	eb = b+nb;	es = s+ns; 	while(s < es){		if(*s == '\n'){			if(b+2 > eb)				break;			iputs(b, '\r');			b+=2;		}		s += chartorune(&r, s);		if(b+2 > eb)			break;		if(r <= Bits16){			iputs(b, r);			b+=2;			continue;		} 		r -= Bits16+1;		if(r > Bits20){			iputs(b, Runeerror);			b+=2;			continue;		}		if(b+4 > eb)			break;		iputs(b+0, HHalfZoneS | (r >> 10));		iputs(b+2, LHalfZoneS | (r & Bits10));		b+=4;	}	return b-buf;} intfromutf16(char* str, int ns, uchar* ws, int nw){	char *s, *es, buf[UTFmax];	uchar *q, *eq;	ushort w1, w2;	Rune r;	int n; 	s = str;	es = str + ns;	q = ws;	eq = ws + nw; 	while(q+2 <= eq){		w1 = igets(q);		q += 2;		if(w1<HHalfZoneS || w1>LHalfZoneE){			r = w1;			goto Convert;		}		if(w1>HHalfZoneE){			r = Runeerror;			goto Convert;		}		if(q+2 > eq){			r = Runeerror;			goto Convert;		}		w2 = igets(q);		q += 2;		if(w2<LHalfZoneS || w2>LHalfZoneE){			r = Runeerror;			goto Convert;		}		r = (w1 & Bits10)<<10 | (w2 & Bits10) + Bits16 + 1;	Convert:		n = runetochar(buf, &r);		if(buf[0] == '\r')			continue;		if(s+n > es)			break;		memmove(s, buf, n);		s += n;	}	return s-str;}