48 lines
1015 B
C
48 lines
1015 B
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <lib9.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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}
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