2 * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
28 * Prepare a vector buffer for adding 'extra' elements.
30 * esize size of a vector element
31 * ptr pointer to the 'ptr' vector field
32 * len pointer to the 'len' vector field
33 * extra number of elements to add
35 * If the buffer must be enlarged, then this function allocates the new
36 * buffer and releases the old one. The new buffer address is then returned.
37 * If the buffer needs not be enlarged, then the buffer address is returned.
39 * In case of enlargement, the 'len' field is adjusted accordingly. The
40 * 'ptr' field is not modified.
43 vector_expand(void *buf
,
44 size_t esize
, size_t *ptr
, size_t *len
, size_t extra
)
49 if (*len
- *ptr
>= extra
) {
53 if (nlen
- *ptr
< extra
) {
59 nbuf
= xmalloc(nlen
* esize
);
61 memcpy(nbuf
, buf
, *len
* esize
);