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#include <string.h>
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#define	N	256
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char*
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strpbrk(const char *s, const char *b)
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{
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	char map[N];
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	memset(map, 0, N);
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	for(;;) {
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		map[*b] = 1;
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		if(*b++ == 0)
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			break;
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	}
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	while(map[*s++] == 0)
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		;
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	if(*--s)
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		return (char *)s;
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	return 0;
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}