1 /*
2 * Copyright (c) 2018 The strace developers.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "defs.h"
29 #include "retval.h"
30
31 static kernel_long_t *retval_vec;
32 static size_t retval_vec_capacity; /* size of the arena */
33 static size_t retval_vec_size; /* size of the used arena */
34
35 static void
expand_retval_vec(void)36 expand_retval_vec(void)
37 {
38 const size_t old_capacity = retval_vec_capacity;
39 retval_vec = xgrowarray(retval_vec, &retval_vec_capacity,
40 sizeof(*retval_vec));
41 memset(retval_vec + old_capacity, 0,
42 (retval_vec_capacity - old_capacity)
43 * sizeof(*retval_vec));
44 }
45
46 uint16_t
retval_new(const kernel_long_t rval)47 retval_new(const kernel_long_t rval)
48 {
49 const uint16_t idx = retval_vec_size;
50
51 if (idx < retval_vec_size)
52 error_func_msg_and_die("retval index overflow");
53
54 if (retval_vec_size == retval_vec_capacity)
55 expand_retval_vec();
56
57 retval_vec[idx] = rval;
58 ++retval_vec_size;
59
60 return idx;
61 }
62
63 kernel_long_t
retval_get(const uint16_t rval_idx)64 retval_get(const uint16_t rval_idx)
65 {
66 if (rval_idx >= retval_vec_size)
67 error_func_msg_and_die("rval_idx >= retval_vec_size");
68
69 return retval_vec[rval_idx];
70 }
71