Last change
on this file since 445 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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Property svn:eol-style
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native
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Property svn:mime-type
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text/x-csrc;charset=UTF-8
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File size:
848 bytes
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1 | #include <string.h>
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2 | #include <stdint.h>
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3 | #include <limits.h>
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4 |
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5 | #define ALIGN (sizeof(size_t)-1)
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6 | #define ONES ((size_t)-1/UCHAR_MAX)
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7 | #define HIGHS (ONES * (UCHAR_MAX/2+1))
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8 | #define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
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9 |
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10 | void *memccpy(void *restrict dest, const void *restrict src, int c, size_t n)
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11 | {
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12 | unsigned char *d = dest;
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13 | const unsigned char *s = src;
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14 | size_t *wd, k;
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15 | const size_t *ws;
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16 |
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17 | c = (unsigned char)c;
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18 | if (((uintptr_t)s & ALIGN) == ((uintptr_t)d & ALIGN)) {
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19 | for (; ((uintptr_t)s & ALIGN) && n && (*d=*s)!=c; n--, s++, d++);
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20 | if ((uintptr_t)s & ALIGN) goto tail;
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21 | k = ONES * c;
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22 | wd=(void *)d; ws=(const void *)s;
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23 | for (; n>=sizeof(size_t) && !HASZERO(*ws^k);
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24 | n-=sizeof(size_t), ws++, wd++) *wd = *ws;
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25 | d=(void *)wd; s=(const void *)ws;
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26 | }
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27 | for (; n && (*d=*s)!=c; n--, s++, d++);
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28 | tail:
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29 | if (*s==c) return d+1;
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30 | return 0;
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31 | }
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