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43 lines
772 B
C
43 lines
772 B
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include "libbb.h"
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/*
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* Read all of the supplied buffer from a file.
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* This does multiple reads as necessary.
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* Returns the amount read, or -1 on an error.
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* A short read is returned on an end of file.
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*/
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ssize_t full_read(int fd, void *buf, size_t len)
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{
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ssize_t cc;
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ssize_t total;
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total = 0;
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while (len > 0) {
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cc = safe_read(fd, buf, len);
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if (cc < 0)
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return cc; /* read() returns -1 on failure. */
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if (cc == 0)
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break;
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buf = ((char *)buf) + cc;
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total += cc;
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len -= cc;
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}
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return total;
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}
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