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#include	<string.h>
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void*
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memchr(const void *ap, int c, size_t n)
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{
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	unsigned char *sp;
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	sp = ap;
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	c &= 0xFF;
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	while(n > 0) {
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		if(*sp++ == c)
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			return sp-1;
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		n--;
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	}
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	return 0;
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}