| Elliott Hughes | 28e98bc | 2018-06-14 16:59:04 -0700 | [diff] [blame] | 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 |
| 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 |
| 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 |
| 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 | } |