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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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/* Append an input line to a String.
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 *
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 * Returns a pointer to the character string (or 0).
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 * Trailing newline is left on.
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 */
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extern char *
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s_read_line(Biobuf *fp, String *to)
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{
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	char *cp;
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	int llen;
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	if(to->ref > 1)
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		sysfatal("can't s_read_line a shared string");
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	s_terminate(to);
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	cp = Brdline(fp, '\n');
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	if(cp == 0)
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		return 0;
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	llen = Blinelen(fp);
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	if(to->end - to->ptr < llen)
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		s_grow(to, llen);
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	memmove(to->ptr, cp, llen);
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	cp = to->ptr;
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	to->ptr += llen;
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	s_terminate(to);
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	return cp;
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}