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[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 8 | */
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| 9 |
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| 10 | #include "libbb.h"
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| 11 |
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| 12 | /*
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| 13 | * Write all of the supplied buffer out to a file.
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| 14 | * This does multiple writes as necessary.
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| 15 | * Returns the amount written, or -1 on an error.
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| 16 | */
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[1765] | 17 | ssize_t full_write(int fd, const void *buf, size_t len)
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[821] | 18 | {
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| 19 | ssize_t cc;
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| 20 | ssize_t total;
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| 21 |
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| 22 | total = 0;
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| 23 |
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[1765] | 24 | while (len) {
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[821] | 25 | cc = safe_write(fd, buf, len);
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| 26 |
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| 27 | if (cc < 0)
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[1765] | 28 | return cc; /* write() returns -1 on failure. */
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[821] | 29 |
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| 30 | total += cc;
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| 31 | buf = ((const char *)buf) + cc;
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| 32 | len -= cc;
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| 33 | }
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| 34 |
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| 35 | return total;
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| 36 | }
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