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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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#include "String.h"
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enum
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{
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	Minread=	256,
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};
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/* Append up to 'len' input bytes to the string 'to'.
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 *
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 * Returns the number of characters read.
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 */
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extern int
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s_read(Biobuf *fp, String *to, int len)
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{
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	int rv;
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	int n;
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	if(to->ref > 1)
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		sysfatal("can't s_read a shared string");
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	for(rv = 0; rv < len; rv += n){
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		n = to->end - to->ptr;
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		if(n < Minread){
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			s_grow(to, Minread);
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			n = to->end - to->ptr;
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		}
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		if(n > len - rv)
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			n = len - rv;
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		n = Bread(fp, to->ptr, n);
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		if(n <= 0)
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			break;
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		to->ptr += n;
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	}
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	s_terminate(to);
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	return rv;
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}