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annotate lib/xmemdup0.c @ 16201:8250f2777afc

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maint: update all copyright year number ranges Run "make update-copyright".
author Jim Meyering <meyering@redhat.com>
date Sun, 01 Jan 2012 10:04:58 +0100
parents 97fc9a21a8fb
children 18a38c9615f0
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1 /* xmemdup0.c -- copy a block of arbitrary bytes, plus a trailing NUL
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2
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8250f2777afc maint: update all copyright year number ranges
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3 Copyright (C) 2008-2012 Free Software Foundation, Inc.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 #include <config.h>
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19
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20 #include "xmemdup0.h"
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21 #include "xalloc.h"
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22
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23 #include <string.h>
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24
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25 /* Clone an arbitrary block of bytes P of size S, with error checking,
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26 and include a terminating NUL byte. P is of type `void const *',
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27 to make it easier to use this with other mem* functions that return
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28 `void *', but since appending a NUL byte only makes sense on bytes,
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29 the return type is `char *'.
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30
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31 The terminating NUL makes it safe to use strlen or rawmemchr to
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32 check for embedded NUL; it also speeds up algorithms such as escape
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33 sequence processing on arbitrary memory, by making it always safe
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34 to read the byte after the escape character rather than having to
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35 check if each escape character is the last byte in the object. */
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36
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37 char *
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38 xmemdup0 (void const *p, size_t s)
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39 {
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40 char *result = xcharalloc (s + 1);
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41 memcpy (result, p, s);
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42 result[s] = 0;
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43 return result;
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44 }