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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- #include <u.h>
- #include <libc.h>
- #include <bio.h>
- #include "String.h"
- enum
- {
- Minread= 256,
- };
- /* Append up to 'len' input bytes to the string 'to'.
- *
- * Returns the number of characters read.
- */
- extern int
- s_read(Biobuf *fp, String *to, int len)
- {
- int rv;
- int n;
- if(to->ref > 1)
- sysfatal("can't s_read a shared string");
- for(rv = 0; rv < len; rv += n){
- n = to->end - to->ptr;
- if(n < Minread){
- s_grow(to, Minread);
- n = to->end - to->ptr;
- }
- if(n > len - rv)
- n = len - rv;
- n = Bread(fp, to->ptr, n);
- if(n <= 0)
- break;
- to->ptr += n;
- }
- s_terminate(to);
- return rv;
- }
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