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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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17 | ssize_t full_write(int fd, const void *buf, size_t len)
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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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24 | while (len) {
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25 | cc = safe_write(fd, buf, len);
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26 |
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27 | if (cc < 0)
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28 | return cc; /* write() returns -1 on failure. */
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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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