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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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3 Copyright (C) 2008 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 } |
