Last change
on this file since 367 was 337, checked in by coas-nagasima, 6 years ago |
ASP3版ECNLを追加
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-
Property svn:eol-style
set to
native
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Property svn:mime-type
set to
text/x-csrc;charset=UTF-8
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File size:
848 bytes
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Rev | Line | |
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[337] | 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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