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reallocarray.c - stagit-gopher - A git gopher frontend. (mirror) |
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git clone git://bitreich.org/stagit-gopher/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfrinws65d7roiv6bfj7d652fid.onion/stagit-gopher/ (git://bitreich.org) |
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LICENSE |
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--- |
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reallocarray.c (1306B) |
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--- |
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1 /* |
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2 * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net> |
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3 * |
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4 * Permission to use, copy, modify, and distribute this software for any |
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5 * purpose with or without fee is hereby granted, provided that the above |
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6 * copyright notice and this permission notice appear in all copies. |
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7 * |
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8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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15 */ |
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16 |
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17 #include <sys/types.h> |
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18 #include <errno.h> |
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19 #include <stdint.h> |
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20 #include <stdlib.h> |
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21 |
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22 #include "compat.h" |
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23 |
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24 /* |
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25 * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX |
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26 * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW |
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27 */ |
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28 #define MUL_NO_OVERFLOW (1UL << (sizeof(size_t) * 4)) |
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29 |
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30 void * |
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31 reallocarray(void *optr, size_t nmemb, size_t size) |
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32 { |
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33 if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) && |
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34 nmemb > 0 && SIZE_MAX / nmemb < size) { |
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35 errno = ENOMEM; |
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36 return NULL; |
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37 } |
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38 return realloc(optr, size * nmemb); |
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39 } |
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