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#include <u.h>
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#include <libc.h>
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#include <ctype.h>
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int
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encodefmt(Fmt *f)
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{
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	char *out;
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	char *buf;
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	int len;
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	int ilen;
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	int rv;
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	uchar *b;
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	char *p;
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	char obuf[64];	// rsc optimization
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	if(!(f->flags&FmtPrec) || f->prec < 1)
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		goto error;
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	b = va_arg(f->args, uchar*);
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	if(b == 0)
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		return fmtstrcpy(f, "<nil>");
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	ilen = f->prec;
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	f->prec = 0;
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	f->flags &= ~FmtPrec;
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	switch(f->r){
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	case '<':
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		len = (8*ilen+4)/5 + 3;
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		break;
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	case '[':
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		len = (8*ilen+5)/6 + 4;
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		break;
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	case 'H':
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		len = 2*ilen + 1;
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		break;
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	default:
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		goto error;
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	}
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	if(len > sizeof(obuf)){
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		buf = malloc(len);
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		if(buf == nil)
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			goto error;
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	} else
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		buf = obuf;
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	// convert
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	out = buf;
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	switch(f->r){
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	case '<':
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		rv = enc32(out, len, b, ilen);
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		break;
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	case '[':
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		rv = enc64(out, len, b, ilen);
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		break;
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	case 'H':
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		rv = enc16(out, len, b, ilen);
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		if(rv >= 0 && (f->flags & FmtLong))
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			for(p = buf; *p; p++)
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				*p = tolower(*p);
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		break;
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	default:
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		rv = -1;
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		break;
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	}
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	if(rv < 0)
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		goto error;
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	fmtstrcpy(f, buf);
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	if(buf != obuf)
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		free(buf);
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	return 0;
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error:
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	return fmtstrcpy(f, "<encodefmt>");
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}