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/*
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 * The authors of this software are Rob Pike and Ken Thompson.
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 *              Copyright (c) 2002 by Lucent Technologies.
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 * Permission to use, copy, modify, and distribute this software for any
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 * purpose without fee is hereby granted, provided that this entire notice
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 * is included in all copies of any software which is or includes a copy
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 * or modification of this software and in all copies of the supporting
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 * documentation for such software.
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 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
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 * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY
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 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
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 * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
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 */
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#include <stdarg.h>
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#include <string.h>
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#include "utf.h"
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#include "fmt.h"
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#include "fmtdef.h"
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/* format the output into f->to and return the number of characters fmted  */
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int
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dorfmt(Fmt *f, const Rune *fmt)
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{
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	Rune *rt, *rs;
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	int r;
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	char *t, *s;
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	int nfmt;
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	nfmt = f->nfmt;
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	for(;;){
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		if(f->runes){
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			rt = f->to;
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			rs = f->stop;
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			while((r = *fmt++) && r != '%'){
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				FMTRCHAR(f, rt, rs, r);
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			}
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			f->nfmt += rt - (Rune *)f->to;
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			f->to = rt;
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			if(!r)
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				return f->nfmt - nfmt;
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			f->stop = rs;
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		}else{
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			t = f->to;
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			s = f->stop;
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			while((r = *fmt++) && r != '%'){
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				FMTRUNE(f, t, f->stop, r);
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			}
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			f->nfmt += t - (char *)f->to;
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			f->to = t;
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			if(!r)
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				return f->nfmt - nfmt;
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			f->stop = s;
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		}
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		fmt = __fmtdispatch(f, fmt, 1);
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		if(fmt == nil)
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			return -1;
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	}
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	return 0;		/* not reached */
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}