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#include <u.h>
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#include <libc.h>
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#define	N	256
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long
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strcspn(char *s, 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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	for(;;) {
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		map[*(uchar*)b] = 1;
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		if(*b++ == 0)
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			break;
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	}
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	os = s;
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	while(map[*(uchar*)s++] == 0)
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		;
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	return s - os - 1;
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}