mirror of
https://github.com/fluencelabs/musl
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24 lines
592 B
C
24 lines
592 B
C
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#include <string.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <limits.h>
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#define ALIGN (sizeof(size_t)-1)
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#define ONES ((size_t)-1/UCHAR_MAX)
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#define HIGHS (ONES * (UCHAR_MAX/2+1))
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#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
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char *strchr(const char *s, int c)
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{
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c = (char)c;
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if (!c) return (char *)s + strlen(s);
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for (; ((uintptr_t)s & ALIGN) && *s && *s != c; s++);
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if (*s && *s != c) {
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const size_t *w;
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size_t k = ONES * c;
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for (w = (const void *)s; !HASZERO(*w) && !HASZERO(*w^k); w++);
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for (s = (const void *)w; *s && *s != c; s++);
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}
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return *s ? (char *)s : 0;
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}
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