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