Last change
on this file was 444, checked in by coas-nagasima, 4 years ago |
muslのソースコードを追加
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File size:
766 bytes
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1 | #include <stdlib.h>
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2 | #include <stdint.h>
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3 | #include <limits.h>
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4 | #include <errno.h>
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5 | #include "libc.h"
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6 |
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7 | #define ALIGN 16
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8 |
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9 | void *__expand_heap(size_t *);
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10 |
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11 | static void *__simple_malloc(size_t n)
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12 | {
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13 | static char *cur, *end;
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14 | static volatile int lock[2];
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15 | size_t align=1, pad;
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16 | void *p;
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17 |
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18 | if (!n) n++;
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19 | while (align<n && align<ALIGN)
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20 | align += align;
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21 |
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22 | LOCK(lock);
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23 |
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24 | pad = -(uintptr_t)cur & align-1;
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25 |
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26 | if (n <= SIZE_MAX/2 + ALIGN) n += pad;
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27 |
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28 | if (n > end-cur) {
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29 | size_t m = n;
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30 | char *new = __expand_heap(&m);
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31 | if (!new) {
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32 | UNLOCK(lock);
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33 | return 0;
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34 | }
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35 | if (new != end) {
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36 | cur = new;
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37 | n -= pad;
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38 | pad = 0;
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39 | }
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40 | end = new + m;
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41 | }
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42 |
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43 | p = cur + pad;
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44 | cur += n;
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45 | UNLOCK(lock);
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46 | return p;
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47 | }
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48 |
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49 | weak_alias(__simple_malloc, malloc);
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50 | weak_alias(__simple_malloc, __malloc0);
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