1 | /* xmemdup0.c -- copy a block of arbitrary bytes, plus a trailing NUL |
2 | |
3 | Copyright (C) 2008-2019 Free Software Foundation, Inc. |
4 | |
5 | This program is free software: you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by |
7 | the Free Software Foundation; either version 3 of the License, or |
8 | (at your option) any later version. |
9 | |
10 | This program is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU General Public License |
16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <config.h> |
19 | |
20 | #include "xmemdup0.h" |
21 | #include "xalloc.h" |
22 | |
23 | #include <string.h> |
24 | |
25 | /* Clone an arbitrary block of bytes P of size S, with error checking, |
26 | and include a terminating NUL byte. P is of type 'void const *', |
27 | to make it easier to use this with other mem* functions that return |
28 | 'void *', but since appending a NUL byte only makes sense on bytes, |
29 | the return type is 'char *'. |
30 | |
31 | The terminating NUL makes it safe to use strlen or rawmemchr to |
32 | check for embedded NUL; it also speeds up algorithms such as escape |
33 | sequence processing on arbitrary memory, by making it always safe |
34 | to read the byte after the escape character rather than having to |
35 | check if each escape character is the last byte in the object. */ |
36 | |
37 | char * |
38 | xmemdup0 (void const *p, size_t s) |
39 | { |
40 | char *result = xcharalloc (s + 1); |
41 | if (s > 0) |
42 | memcpy (result, p, s); |
43 | result[s] = 0; |
44 | return result; |
45 | } |
46 | |